Project ABC

A Road

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Mechanical O&M Information

 

 

 

 

 

 

Start Date: 17/07/2011

End Date: 7/11/2011

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Contents of Mechanical Section

 

 

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Health & Safety File        

 

O&M Information

Architectural elements

Mechanical elements

Electrical elements

 

 

 

Contents of Mechanical Section. 2

1.      Introduction. 3

2.      Contract Directory. 4

3.      Residual Risk Assessment 5

4.      General Scope of Mechanical Works. 6

5.      Mechanical Services. 7

6.      Detailed Table of Contents. 48

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


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1.          Introduction

The purpose of this manual is to offer the personnel concerned with the operation and maintenance of the services within the building, maximum assistance in the performance of their duties. It is intended that this manual will be used to assist skilled engineers, experienced in the operation and maintenance of building services and associated systems and to provide them with a working knowledge of the various systems installed within the project.

 

All information contained herein is valid at the time of preparation and the date of issue. Changes arising in building usage, legislation etc. will necessitate revisions to be made in order to retain the manuals validity and usefulness. Any such revisions should be recorded in the Health & Safety File.

 

It should be noted that this manual is not intended to supersede or conflict with any standard maintenance/inspection routines already in use for the base build system.

 

The Building has recently undergone a name change and is now referred to as ABC Project. ABC Project house has been referenced throughout this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


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2.          Contract Directory

Mechanical Services

 

Company Name

1st line of address

2nd line of address

Town

postcode

 

Contact:      Name Here

Tel:            00000 000 000

Email:         emailaddress@here.co.uk  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


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3.          Residual Risk Assessment

None

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


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4.          General Scope of Mechanical Works

The project involves the complete refurbishment of the mechanical building services installations within the Project.

 

Works comprised the performance design, supply, installation (including strip out etc), testing and commissioning associated with the following:

 

1.     Removal of existing heating, cooling and ventilation central plant including but not limited to associated air handling units, boilers, chillers, pumps, fan coil terminal units including all associated pipework, electrical supplies, controls, secondary ductwork, etc

2.     Installation of new constant volume fresh air ventilation plant to serve the office accommodation (NB: the project also includes the replacement of the central fresh air ventilation plant within the Apollo building).

3.     Installation of new VRV comfort cooling systems and automatic control systems to serve the ground & first floor office accommodation in Ares building.

4.     Servicing, testing and re-commissioning of existing VRV installations within Apollo building.

5.     Modification of existing drainage and domestic services to suit new sanitary ware facilities.

6.     Removal of existing and installation of new toilet extract ventilation plant.

7.     Removal of existing BMS system and MCCP panels and provision of new central plant controls arrangements.`

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


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5.          Mechanical Services

5.1.          Contractor

Company Name

1st line of address

2nd line of address

Town

postcode

 

Contact:      Name Here

Tel:            00000 000 000

Email:         emailaddress@here.co.uk  

 

5.2.          Scope of Works

5.2.1.           Introduction

This section of the manual covers the parts of the mechanical and electrical installation that were included in the refurbishment

 

commenced portion of the onsite works on July 2011. The works are due to be handed over on the date 12 Sept 2011 phase 1.

 

The works were carried out after successful contract award from Skansen Interiors for the Mechanical installation only at of ARES Building at The Odyssey business park south Ruislip HA4 6QE

 

 

5.2.2.           Works Description

1.     New 3 pipe Mitsubishi VRF FCU A/C installation

2.     New secondary air ductwork and grilles and diffusers

3.     Foul drainage modifications

4.     Hot and cold water services modifications

5.     Modifications to Supply & Extract air ventilation inc new AHU’s

6.     WC Extract air ventilation

7.     Flushing a water treatment of complete system

8.     Controls

9.     Maintenance work in Apollo building

10.    New AHU’s to Apollo building.

11.    Testing & Commissioning

12.    Client Training

13.    Operation & Maintenance Manuals

14.    Record Drawings

 

 

 

 

 

 

 


 

5.3.          Operating Procedures

5.3.1.           General Note to User

The priority in undertaking any Operational activities is to ensure that the operator should remain safe.

 

Please ensure that before undertaking any adjustments on installed works you have fully understood any Health & Safety risks to your person, have the appropriate training to undertake the activities and hold the relevant Permits.

 

 

5.3.2.           Mechanical Services

5.3.2.1.        VRV Comfort Cooling Installations

The abbreviation ‘VRV’ (variable refrigerant volume) and ‘VRF’ (variable refrigerant flow) shall, in the context of this design package, have the same meaning and are represented by ‘VRV’ in the following text.

VRF is the Mitsubishi equivalent to Daikins VRV.

 

 

5.3.2.2.        Apollo Building

refurbished circa 4 years ago in a similar manner to the proposed Ares building refurbishment.

The building is served throughout by a number of Daikin VRV comfort cooling systems consisting of outdoor units located in a ground level compound serving ceiling void mounted indoor chassis units.

The systems are controlled via central remote controllers located within the ground floor electrical switch room.

 

The building has been unoccupied since its refurbishment but the systems have been operating on a ‘low setting’ and were serviced for 3 years under the manufacturer’s warranty.

We have allowed for the following works to each of the VRV systems within Apollo building:

 

•      A full service of each system shall be undertaken in accordance with the manufacturer’s recommendations.

•      Refrigerant volume checks shall be undertaken & logged in accordance with the F Gas Regulations.

•      Any leaks found shall be noted and reported to the Main Contractor.

•      Re-commissioning of the VRV systems shall be carried out by our Daikin Approved D1 installer.

•      Upon completion of the servicing and re-commissioning of the systems the operation of the systems shall be demonstrated to nominated client representatives prior ot hand over

•      Full records of the servicing and re-commissioning works shall be provided upon satisfactory completion of the works.

 

 

 

 


 

5.3.3.           Ares Building

5.3.3.1.        Description of Installed Systems

We shall supply, install, test and commission 6 No. New VRV heat recovery comfort cooling systems to serve the ground and first floor office areas and the main entrance area within.

 

Each system shall consist of an outdoor condenser unit(s) connected to multiple indoor units and shall be capable of providing simultaneous heating and cooling from any two adjacent indoor units at any time to provide maximum future flexibility and energy efficiency.  VRV plant selections have been undertaken to achieve ECA compliance.

 

The sum of indoor unit capacities on each system shall not exceed 120% of the rating of the outdoor unit at the specified UK design conditions.  Each system shall incorporate inverter driven compressor technology to vary the compressor speed to match the cooling or heating load and maximize system efficiencies.

We have determined the peak heating and cooling loads for each zone based upon the specified design criteria and the existing building fabric details. 

 

 

5.3.3.2.        Extended Warranty

specialist VRV contractor shall ensure that all necessary procedures are followed to obtain he manufacturer’s extended warranty and that all VRV equipment is installed and commissioned in accordance with the manufacturer’s recommendations.

The specialist VRV contractor shall complete and return all requisite commissioning certification, log books etc to the manufacturer within their stated timescales.

Upon completion of the works the Contractor shall provide a manufacturer’s letter or certificate confirming that all new VRV systems are covered by a 5 year extended warranty (subject to ongoing maintenance in accordance with the manufacturer’s recommendations).  This shall be provided to Paragon LLP at the earliest opportunity following testing and commissioning of the systems and no later than 4 weeks from the date of Practical Completion.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

5.3.3.3.        Indoor Units

Indoor units shall be selected to meet the calculated peak heating/cooling load, including the associated fresh air load, within each zone at the specified design criteria.  The indoor unit selections shall be based upon units providing the design peak heating/cooling load at ‘low’ fan speed.

Indoor units shall be ducted chassis type fan coil units mounted within the ceiling void incorporating proprietary supply air plenums with spigot connections and rigid galvanised secondary ductwork connections to ceiling mounted swirl diffusers.

 

Unit castings shall be manufactured from galvanised steel plate and shall be fully insulated.  The fan shall be of the dual suction multi blade type, statically and dynamically balanced to ensure low noise and vibration free operation.

 The heat exchanger coils will be manufactured from copper tubes and aluminium fins.

The unit shall incorporate an electronic expansion valve to control refrigerant flow rate in response to the load variation in the conditioned space.  The expansion valve shall be controlled by an integral computerised PID control system to maintain room temperature at the set point.

A condensate lift pump shall be provided within the unit, this pump shall be capable of discharging above the drain outlet.

Indoor units shall be provided with appropriate power supplies emanating from the local Landlord distribution boards located at each floor level (refer to Electrical Services Scope of Works).

 

 

5.3.3.4.        Secondary Air Design

The VRV indoor units shall incorporate purpose made insulated supply air plenum boxes to permit connection of rigid galvanised secondary supply ductwork.  All secondary ductwork shall be insulated with final connections (maximum 1 metre length) to diffusers in insulated flexible ductwork.

Each plenum box shall incorporate a minimum of 3 No. Suitably sized supply air spigot connections to provide future flexibility and supply air options.  Any unused spigots at the installation stage shall be blanked off with a securely fixed removable blanking plate.  Each secondary duct shall incorporate a lever operated lockable volume control damper for air balancing purposes which shall be installed on each of the ‘live’ ductwork connections off the plenum box.

Within office spaces secondary conditioned air shall be introduced into the space via 595 x 595 mm, fixed blade swirl pattern diffusers incorporating insulated plenum boxes with side entry spigot connections orientated to suit the secondary ductwork design.

Return air shall be via an appropriate number of ‘dummy’ swirl diffusers to match the supply diffusers positioned locally to the associated indoor unit to permit return & extract air via the ceiling void, which shall act as a return air plenum typically one per Fan Coil unit.

New supply and return air diffusers shall be as Waterloo type SDFS or approved equivalent.

Secondary air ductwork shall be designed to achieve a maximum air velocity of 3 m/s onto the supply diffuser plenum boxes and in accordance with the following design/selection criteria:

Diffusers shall be selected to handle the respective indoor unit air volumes with due consideration of the proposed ceiling height and the full range of supply air temperatures at which the VRV system will operate to ensure complete mixing of supply air with room air without ‘dumping’ of cold air and discomfort to occupants, at full and part load cooling capacities and across the air flow range of the VRV indoor unit.

 

 

5.3.3.5.        Main Entrance Areas

The main entrance area within the building shall be conditioned by two VRV indoor units located within the ceiling voids at ground and first floor level.

The ground floor unit shall discharge via a minimum of 4 No. Drum jet type diffusers installed within the vertical bulkhead (in place of existing linear slot diffusers served by fan coil unit.* see photo

Diffusers shall be as Waterloo ‘WDJ’ with fully adjustable air pattern or approved equivalent.

Within Apollo building, the existing linear slot diffusers served by the VRV unit shall be removed and new drum jet type diffusers shall be installed in the same manner as described above.

The unit at first floor level shall discharge via the existing linear slot diffusers located adjacent to the curtain wall glazing.

 

 

5.3.3.6.        Condensate Drainage

The existing condensate drainage systems serving the fan coil unit installations shall be removed in their entirety, including all Pipework brackets, supports and accessories by others.

Any redundant connections to the above ground soil and waste Pipework shall be capped off using proprietary Pipework fittings.

New insulated condensate Pipework systems shall be installed to receive condensate discharge from each of the VRV indoor units and discharge by gravity with a minimum fall of 1 in 100.

 

Condensate Pipework shall be in copper tube Table X, to BS EN 1057 utilising capillary fittings.  Thermal insulation shall be applied to all Pipework in the form of foil faced rigid mineral fibre sections with identification applied in accordance with BS 1710.

Short lengths (maximum 300 mm long) of braided plastic Pipework may be utilised to make final connection onto the indoor units.

The new condensate Pipework systems shall connect into the existing above ground drainage systems within the toilet cores in agreed locations via a tundish and running trap or self sealing trap arrangement.

Upon completion of the works we shall undertake water flow tests to ensure that the condensate disposal Pipework is fully watertight and to verify the soundness of all joints including those between flexible and solid Pipework.

 

5.3.3.7.        Outdoor Units

Outdoor units shall be located externally at roof level within the chiller compound and shall be mounted on a purpose designed galvanised steelwork support frame in accordance with the Structural Engineer’s specification ( organised via the Main Contractor)

The steelwork support frame shall be designed to accommodate the final plant selections with due consideration for pipework routing and maintenance access.  Outdoor units shall be arranged to achieve the manufacturer’s minimum recommended maintenance and airflow clearances.

 

The support details for the outdoor units shall be designed to permit routing of pipework and cabling to the units without compromising maintenance access whilst ensuring that the overall height of the installation is such that the top of the outdoor units do not extend beyond the top edge of the roof plant compound perimeter louvre system.

We shall confirm the proposed plant layout and associated dimensions, clearances and weights of the proposed equipment at the earliest opportunity during the design stage to enable consideration by the Structural Engineer.

Outdoor units shall be of the air-cooled type incorporating inverter scroll hermetic compressors with inverter control, variable speed, direct driven propeller type fan(s), electronically controlled and capable of changing speed linearly to follow the variation in cooling or heating requirements.  Heat exchanger coils shall be manufactured from copper tubes with aluminium fins treated to mitigate the harmful effects of urban pollution.  The unit casing shall be manufactured from polyester powder coated baked enamel finish sheet steel in order to have a high corrosion resistance.  The air outlet shall have plastic coated wire guards.

The number and arrangement of compressors shall provide multiple steps of capacity control to meet load fluctuations and maximise the efficiency of the system at part load conditions.  Multiple outdoor unit combinations shall be capable of proving backup operation should one of the outdoor units suffer an error.  A simple user reset shall provide 8 hours of operation which can be reset as many times as required without the need of service personnel to attend site.

Outdoor units shall be complete with electronic expansion valve(s), oil separator(s), high pressure switches, inverter driven fan motors, safety thermostat, over current relay, inverter overload protection, fuses, necessary solenoid valves, liquid shutoff valves, gas line shut off valves, short re-cycling guard timer and all necessary sensors for optimized, safe and trouble free operation.  Access to the internal components for maintenance purposes shall be by removable panels.

 

All refrigerant connections both internal within the unit and the external connections to the indoor units shall be brazed. 

 The outdoor units shall be capable of being combined, using a number of outdoor units connected together to achieve higher capacity systems.

Units shall have the capability to monitor and log data in a critical memory which will store and provide 5 minutes of real time operational data prior to any system failure, providing “Black Box” data recording capability which can be used by a qualified service technician to perform efficient an d precise interrogation.

Outdoor units shall be provided with appropriate power supplies from new Landlord distribution boards (refer to Electrical Services Scope of Works). We shall ensure that all necessary electrical supply requirements are confirmed with the electrical sub- contractor in a timely manner during the tender period to enable selection of suitably sized distribution boards and sizing of the associated electrical infrastructure and final circuits.

 

 

5.3.3.8.        VRV System Controls

The new VRV systems shall be controlled via a proprietary control system which shall be supplied and installed by the air conditioning specialist.

The VRV systems serving each floor shall be monitored and controlled via a centralised controller ( 2 in total) with touch screen display incorporating the following key features:

Web/internet connection to facilitate remove monitoring & control of the system.

Power consumption monitoring of individual/groups of indoor units.

Ethernet TCP/IP communication to allow monitoring/control of designated individual/groups of indoor units via designated PCs (landlord or tenant)

The control system shall incorporate the facility for all indoor units within a specific area (e.g. tenant’s demise) to be controlled and monitored via a desktop PC or laptop via a nominated IP address connection(s). Lap top PC does not form part of these works.

 

The control system shall incorporate the facility for fault conditions to be transmitted remotely to specified IP addresses via email.

The control system shall incorporate the facility for password protection such that tenant access can be restricted to control/monitoring of indoor units within their own demise.

Each indoor unit shall be incorporate the facility to be connected to a local controller and remote return air temperature sensor and the facility to switch control between local controller and return air sensor as desired.

Each indoor unit within open plan office areas shall be provided with a remote return air temperature sensor located on the rear of one of the associated return air grilles.

Centralised controllers shall be capable as a minimum of individually controlling the following function as a minimum on the respective indoor units (start/stop, run/fail, operating mode, temperature set point, fan speed).

Centralised controllers shall be capable as a minimum of monitoring and displaying the following information individually for each indoor unit (start/stop, run/fail, operating mode, temperature set point, fan speed, return/room air temperature, timer settings, test run, fault code diagnostics).

Outdoor units shall be interlocked to the indoor units such that turning “on” an indoor unit from its local controller shall turn “on” the associated outdoor unit.

Each control system shall incorporate automatic fabric protection to initiate the VRV system in heating mode at low internal temperatures (sent initially to 12 deg C).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

All controls wiring shall be carried out in colour code 2-core non screened stranded wire cabling, tagged with ID numbers at 3 metre intervals for ease of identification and maintenance.  A minimum space of 100 mm (or as otherwise schedules in BS 7671) shall be maintained between controls/communication wiring and small power wiring.  All controls cabling shall be fully concealed, unless otherwise agreed.

There shall be a fire alarm interface with each control system to facilitate shut down of the associated system upon receipt of a fire alarm signal at the central controller.

A laminated and framed operation guide (minimum A3 size) shall be provided adjacent to each central controller location.  The guide shall include the following information:

•      A simplified plan layout of the relevant office area, clearly indicating the indoor unit and controller locations and reference numbers cross referenced with the record drawings

•      A simple guide describing in layman’s terms the use of the controller for controlling, monitoring and displaying the system operation.

 

 

5.3.3.9.        Refrigerant Pipework

Outdoor units shall be connected to the indoor units by insulated refrigerant Pipework systems and refrigerant controllers to ensure that the correct refrigerant phase is delivered to each indoor unit depending on the individual indoor unit requirement for either heating or cooling.

All refrigerant Pipework shall be carried out in refrigerant quality soft/medium drawn copper tubing to BS 2871 Part 2: 1972 and complete with the appropriate headers and joints.  The new refrigerant Pipework installations shall be fully co-ordinated with the building fabric and new and existing services to ensure that future maintenance access is not compromised.

The installation of Pipework shall be carried out by an Approved Refrigerant Engineer (certificate approval shall be submitted prior to installation commencement) and in accordance with BS EN 378: 2000 and the manufacturer’s design and installation instructions.  The longest possible lengths of copper pipe should be utilised to minimise joints on site.  Pipework shall remain capped at all times other than when being connected to prevent the ingress of moisture and contaminants.

After installation of Pipework, and prior to sealing of insulation joints and starting of equipment, Pipework should be pressure tested in accordance with the manufacturer’s recommendations.  Refrigerant charge weight shall be calculated relative to the actual installed length of Pipework in accordance with the manufacturer’s recommendations.

Refrigerant Pipework and power/control cabling shall be securely fixed and supported on suitably sized galvanised tray throughout.

Tray at roof level shall be mounted on a proprietary Pipework support system such as ‘Big Foot’ or ‘Roof-Pro’ consisting of a modular framework system designed to avoid the need for penetrations of the roof membrane.

The support system shall be designed to avoid existing services and obstructions and facilitate future roof maintenance without decommissioning of the associated plant.

All Pipework (suction and liquid lines) shall be insulated with slip-on flexible, closed cell, elastomeric, nitrile rubber insulation, having a wall thickness of not less than 13 mm, to provide protection against condensation and effectively prevent energy loss, as Armaflex Class 0 or approved equivalent.  All Pipework


shall be labelled with ID number (outdoor unit reference number) at 3 metre intervals.

All insulation located externally shall incorporate protective plaint finish to protect the insulation against a sunlight, U.V. radiation and chemical attack, as Armfinish FR, or approved equivalent.  Alternatively, insulated Pipework shall be covered with a secure but removable aluminium capping system.

The connecting refrigerant Pipework shall not exceed the selected manufacturers stated maximum Pipework length between condensing unit and indoor unit and any other appropriate Pipework length and height restrictions as recommended by the selected manufacturer.  Joints in copper pipe shall be brazed and carried out to the requirements of the HVCA Code of Practise – Brazing and Bronze Welding of Copper Pipe and Sheet.  Dry Nitrogen must be utilised at all times in the system during brazing.

 

 

5.3.3.10.     Test and Commissioning

Our Specialist Approved VRV specialist will set up, diagnostically check, commission, monitor and adjust each VRV system and associated controls system and to demonstrate the satisfactory operation of each system to Paragon LLP and the Client’s appointed maintenance contractor.

 

•      Address each fan coil unit and set up heating/cooling groups, set point temperatures, start/stop times, etc

•      Adjust total air flow from each indoor unit to achieve design volume (may require adjustment of factory static pressure setting depending on supply air resistance)

•      Balance air flow to each supply diffuser at max air volume

•      Test disposal of water by condensate drainage system

•      Demonstrate system and controls operation

•      Measure noise rating in each space to verify that the design criteria have been achieved

•      Provide a log of all system settings, serial numbers, configuration and wiring diagrams for each VRV system

 

Documentary evidence shall be provided to demonstrate that each aspect of the testing and commissioning work has been completed satisfactorily and witnessed by a suitably qualified person.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

5.3.4.           Ventilation Supply/Extract

5.3.4.1.        Fresh Air Ventilation Systems

Strip-Out Works

 

Ares and Apollo building are each served by 2 No. Packaged fresh air supply and extract air handling units (AHUs) located within ‘north’ and ‘south’ roof level plant compounds.

 

The existing supply AHUs serving Ares incorporate electric pre-heat coils, chilled water cooling and LPHW re-heat coils.

The existing AHUs serving Apollo incorporate electric pre-heat coils, LPHW run-around coils and electric re-heat coils.

 

The Main Contractors strip out contractor shall remove the existing ventilation plant installations in their entirety including all associated pipework, controls and power supplies, etc.  Distribution ductwork and attenuators shall be stripped out back to the riser locations.

 

 

Description of Proposed Systems

 

Ares and Apollo building shall be served by new constant volume fresh air supply and extract ventilation AHUs located in the dedicated roof plant compounds.  AHUs shall if necessary be mounted on a purpose designed galvanised steelwork support frame in accordance with the Structural Engineer’s specification.  The steelwork support frame shall be designed to accommodate the final plant selections with due consideration for maintenance access.

 

The AHUs, associated heat pumps and support details shall be designed to ensure that the overall height of the installation is such that the top of the plant does not extend beyond the top edge of the roof plant compound perimeter louvre system (NB: the depth of the plant compound is approximately 1,200 – 1,250 mm from slab to top of louvre).

 

New air handling units shall consist of a weatherproofed packaged supply & extract AHU unit in side-by-side configuration incorporating electric pre-heat, cross-flow plate heat exchanger and reverse cycle air-to-water heat pump.

 

Each air handling unit shall be selected to provide the minimum fresh air requirements for occupants within the associated ground and first floor office accommodation.

We have completed detailed calculations to determine the required air volumes and external ductwork system resistance for each system in order to establish the AHU selection duties and sizes.

New ductwork shall be extended from the new AHUs to connect to the existing supply & extract ductwork riser penetrations at external roof level.  Duct mounted attenuators shall be incorporated at roof level between the AHU and riser locations to limit noise transmission to the occupied spaces.

 

The existing primary air distribution ductwork at each floor level shall be modified and extended as necessary to accommodate the new VRV installations and provide a tempered fresh air supply to each VRV indoor unit.

Primary ductwork shall terminate no more than 300 mm from the intake of each of the VRV units.


Ductwork Cleaning

 

We shall employ a ductwork cleaning and hygiene specialist to undertake a deep clean of the existing primary fresh air supply and extract ventilation ductwork serving Ares building.

Works shall include the installation of suitable access doors if required to enable all sections of the ductwork installation to be inspected and thoroughly cleaned and disinfected.

Cleaning shall be undertaken in accordance with HVCA, BSRIA, HSE guidelines & regulations and the recommendations of HVCA TR/19 Cleanliness of Ventilation Systems (2005).

 

All such works shall be fully certified and a post clean report provided.

 

 

Testing & Commissioning

 

We shall employ a Commissioning specialist (member of the Commissioning Specialist Association) to undertake a proportional balance of the modified (primary) and new (secondary) ventilation systems.

Upon completion the Contractor shall provide fully detailed commissioning/test sheets together with accompanying schematic line diagrams of the final installation for inclusion within the O&M manual.

 

Following successful testing and commissioning, the commissioning specialist shall demonstrate the satisfactory balancing of the system to Paragon LLP.

The commissioning specialist shall commission and balance the primary and secondary air slows in accordance with CIBSE Commissioning Codes.

 

 

Design Criteria

Building Regulations                              The new ventilation systems shall be designed to comply with 2010 Building Regulations, in particular the requirements of Part F, Part L2B and the Non-Domestic Building Services Compliance Guide.

 

External design conditions:           Summer    30 deg C db, 22 deg C wb

                                              Winter       -4 deg C db, - 4 deg C wb

 

Tempered Supply Air Temp:         20 deg C minimum

 

Occupancy:                               1 person per 10 m2 (net office area)*

 

Fresh Air Ventilation Supply:         10 litres/sec per person

 

Fresh Air Ventilation Extract:        90% of supply volume

Internal Noise Ratings (Leq)*:      NR 38 open plan areas

                                              NR 35 cellular rooms

Noise levels to be measured at 1.5 m from any grille

 

External Noise Levels:                           New plant shall result in no net increase in existing background noise level at site boundary (subject to agreement with local planning authority).


 

 

Fans:                                                Fan duties shall be calculated by the contractor based upon the extent of the existing/new ductwork distribution systems.  Pressure loss allowances for air filters shall be based on the ‘dirty’ condition

Fan duties shall include the following commissioning allowances:

                                              On Flow Rates                   10%

                                              On Head                           20%

 

Duct Velocities:                          Plant areas/risers          5.0 m/s (max)

Ceiling voids                   3.0 m/s (max)

Louvre face velocity      2.5 m/s (max)

Heating coils                   3.0 m/s (max)

Cooling coils                   2.5 m/s (max)

 

 

AHU General Specification

 

General

•      Double skin casing construction to the EN 1886 standard (2007) incorporating 50 mm Rockwool mineral wool insulation (40 kg/m3)*

•      Sliding access doors incorporating 4No. ¼ turn locking points and 2No. Handles per door

•      Multi service bulkhead incorporating all hydraulic and electrical connections

•      Mounting frame with self-supporting design

•      EUROVENT certification

•      Internal galvanised finish

•      Painted external finish

 

 

Supply

•      Full section motorised damper integrated in weather louvre

•      Electrical heater section with minimum 3 stage control and safety thermostats

•      Full section G4 pre-filter mounted on sliding rail system and complete with pressure tapping’s and inclined tube manometer

•      Plate heat exchanger with full by-pass

•      Short F7 bag filters with pressure tapping’s and inclined tube manometer mounted

•      Heating/cooling coil section with removable sloping stainless steel drip tray, external drain plug and air vent

•      Backward curved fan section incorporating energy efficient variable speed motor/drive, ant-vibration frame & mountings, flexible sleeve connection to casing, bulk head light with switch, porthole and access protection guard

 

Extract

•      Full section motorised damper integrated in weather louvre

•      Full section G4 pre-filter mounted on sliding rail system and complete with pressure tapping’s and inclined tube manometer

•      Backward curved fan section incorporating energy efficient variable speed motor/drive, integral ant- vibration mountings, bulk head light with switch, porthole and access protection guard

•      Plate heat exchanger with full by-pass


 

Reverse Cycle Air –to water heat pump

•      Unit construction

o        Anti-corrosion casing, in cleanable composite material, statiblized to x UV.

o        Condensates pan integrated to the platform.

o        Design and manufacture following ISO 9001 certification

•      Refrigerant circuit(s)

•      Hermetic compressor(s) with integral motor cooled by suction gas, motor protection by coil internal sensor, mounted on anti-vibration mounts

•      Air cooled condenser(s) with coil with copper tubes and high-performance aluminium fins, direct drive propeller fans, weatherproof motor(s)

•      Insulated brazed-plate exchanger(s) with intermediate and end plates made of aisi  316 stainless steel, plate pattern optimised for high efficiency, thermal insulation (NB: water filter to be installed with a rating of less than 800 microns).

•      Hydraulic module including multi-speed accelerator pump, air vent, safety valve, expansion vessel(s), differential water pressure switch.

•      Electrical box incorporating main earth lug, compressor and fan motor contactors

•      Microprocessor based control system to provide:

o        Control of the chilled water temperature (on the return)

o        Control of the hot water temperature (heat pump only)

o        Water law based on the outdoor temperature (RFHC)

o        Self-adaptive control when the compressor operates in short cycle

o        Control of the anti-short cycle

o        Temperatures display on the terminal

o        Control of the unit by terminal or ON / OFF contacts

o        Control of operating parameters

o        Faults diagnosis

•      Refrigeration components

o        Reverse cycle 4 way valves

o        Refrigerant fluid tank

o        Restrictive expansion valve

o        Suction accumulator

o        Filter dryer(s)

•      Control and safety devices

o        High and low pressure safety switches

o        Evaporator anti-freeze sensor

o        Chilled water control sensor

o        Hot water control sensor

o        External sensor temperature

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

5.3.5.           Toilet Extract Systems

5.3.5.1.        Scope of Works

The existing toilet extract fan units located within the first floor ceiling voids serving the primary and secondary toilet cores shall be replaced.  The existing ductwork systems shall generally be retained, with modifications as necessary to accommodate the refurbishment works described below.

 

Air shall be extracted from the sanitary facilities via the existing galvanised ductwork extract systems connected to new ceiling mounted air extract valves.  All existing extract grilles shall be replaced with new air extract valves which shall be suitable for installation within the new solid plasterboard ceiling to be installed within the toilet areas.

 

We shall allow to extend a new branch from the existing toilet extract ductwork system to serve the new Disabled WC located at ground floor level (within current Lift Motor Room).

 

The new fan unit serving the primary toilet core shall be located within the roof level ‘boiler’ room (in the same manner as Apollo building) following removal of the existing boilers, chillers and associated plant and pipework, etc.

Exhaust air shall discharge via a ducted connection to the boiler room louvre.  The existing toilet extract exhaust duct shall be stripped  out by others and blanked off at high level within the first floor ceiling void.

The new fan unit serving the secondary toilet core shall be located at high level within the first floor Store room adjacent to the toilets.  Exhaust air discharge shall be via the existing duct arrangement.

 

New toilet extract units shall be twin fan units as NuAire ‘Quietscroll’ or approved equivalent and shall be sized to provide 6 ac/hour to the sanitary facilities.

The units shall be installed and supported off the building structure in an approved manner and shall incorporate adequate vibration proofing (e.g. by means of suitable hangers/cushion pads and ductwork connections) to prevent transfer of vibration to the building structure and ductwork system.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

The fan unit shall be controlled by a proprietary control panel mounted locally on the fan unit providing the following features:

•      Auto-change over on fan failure.

•      Auto duty share every 12 hours of run time.

•      Integral frequency inverter/speed controller.

•      Integral adjustable run-on timer.

•      Maximum and minimum speed adjustment/setting (trickle and boost)

•      Volt free run & failure/status indication.

•      0 – 10V BMS interface for remote operation.

 

 

5.3.6.           Door Curtain

The existing overdoor air curtains within the primary core ground floor entrance lobby and the fan coil unit serving the secondary core entrance lobby shall be stripped out by others.

 

New recessed electric air curtains of 1500 mm length shall be installed above each entrance door within the suspended plasterboard ceiling .  The new air curtains shall incorporate a self-supporting casing construction made from galvanised plated steel with low noise cross-flow fans driven by a two speed external rotor motor.

Inlet grilles and blow-out jets shall be integrated into a single aluminium frame behind a painted epoxy-polyester white colour RAL 9016 fascia grille.

Air curtains shall be as per ‘mini optima’ by js air curtains or approved equivalent.  The installation shall be controlled via a local control panel with plug and play connectors to be located in an agreed location within the core area.

 

 

5.3.7.           Automatic Controls

5.3.7.1.        Strip-Out Works

The existing plant within Ares building is controlled from a MCCP control panel and Trend outstation located within the ground floor electrical switch room.  The following plant is supplied and controlled from the MCCP panel:

•        LTHW heating boilers

•        LTHW heating pumps

•        Chilled water pumps

•        Toilet extract fans

•        HWS circulating pumps

•        Transfer fans

•        Flue dilution fan

•        Darkroom extract fan

 

All plant supplied and controlled from the main MCCP control panel is to be removed/replaced as part of the refurbishment works and shall be supplied and controlled by alternative controls arrangements.

The Main Contractors strip out contractor shall allow for stripping out the existing controls installation and all associated control panels, outstations, wiring, containment and control devices.  The works shall be planned and undertaking in a phased manner in line with the agreed project programme with due consideration for keeping plant operational during Phase 1 of the works as described elsewhere within this specification.

 

 


 

5.3.7.2.        Ventilation System Controls

We shall employ a controls specialist to undertake the design, installation, testing and commissioning of bespoke automatic controls packages for the new fresh air ventilation plant.

Each AHU installation shall be controlled by a stand-alone packaged control system. This will be linked back to a mechanical control panel as detailed in the controls functional schematic.

All control components external to the plant shall be contained within the New Air Handling Unit package. The following sections provide an outline description of the control system requirements and controls strategy for the ventilation plant.

 

 

5.3.7.3.        AHU Control Panels

The AHU control panel will form an integral part of the AHU casing and manufacture.

All wiring shall be PVC insulated tri-rated phase coloured for mains wiring.  Low voltage control wiring shall be colour coded with cable markers.  The control panel shall be pre-wired to numbered terminals and be complete with engraved black-on-white Traffolyte type labels mechanically fixed to the control panel enclosure.

 

 

5.3.7.4.        Control System

The control system type shall be of Siemens manufacture and shall be capable of connection to a BMS front end and be suitable for the following protocols in the future:

•        BACnet for the automaticon level and management level network

•        LONWORKS(R) and Konnex (KNX) S-Mode (instabus EIB)

•        M-bus, Modbus, OPC and other interfaces

•        TCP/IP network protocol

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

5.3.7.5.        AHU Control

The BMS controller and display shall provide control and monitoring of the following points.

•        Supply air damper actuator

•        Heating coil control

•        Cooling coil control

•        Electric heater battery control (thyristor)

•        Heater battery high limit

•        Supply fan failure

•        Extract fan failure

•        Filter dirty indication for pre and main fulters at the display panel

•        Fire alarm condition for fan(s) shut down

•        Temperature intake air

•        Temperature control (return air)

•        Supply air low limit temperature control

 

During normal operating time periods the BMS shall enable the supply and extract fans and modulate the heat pump and electric heather battery to maintain the desired set point acquired by duct temperature sensors.

The supply and extract fans shall be inverter driven and set up during commissioning for constant speed.  In the event of supply/extract fan failure through a DP switch located across the fan a fault indication shall be shown at the display unit.

Any alarms associated with the monitored plant shall be shown directly on the display unit along with the indication to the cause of the fault i.e. filter dirty.  All alarms shall be acknowledgeable at the display unit and alarms shall be re-set only after the error has ben rectified and acknowledged.

 

 

5.3.7.6.        Heat Pump

The heat pumps shall provide the primary source of heating/cooling.  The heat pump system shall be demand driven and enabled by the BMS.  Temperature sensors shall be used for monitoring.

 

Heat pump fault conditions shall be raised via volt free contacts to the control panel for safe guard interlocking with fault lamp status.  Alarms shall be viewed on the control panel fascia display unit.

 

•        Temperature monitoring

•        Heat pump enable

•        Heat pump fault

 

The Heat pump system shall be controlled, monitored and maintained by a fully packaged system supplied by the heat pump manufacturer.  Alarms shall be viewed on the control panel fascia display unit.

 

 

 

 

 

 

 


 

5.3.7.7.        Fire Alarm Interface

The ventilation system control shall incorporate a fire alarm system interface to effect a shut-down of the ventilation plant in the event of a building fire alarm condition.

 

5.3.7.8.        User Interface

Plant information such as times, temperature set points etc shall be able to be viewed/altered through each control panel fascia display unit.

Any alarms associated with the monitored plant shall be shown directly on the display unit along with indication to the cause of the fault i.e. fan failed, etc.  All alarms shall be acknowledged at the display unit, alarms shall be re-set after the error has been rectified and acknowledged.

 

5.3.7.9.        Commissioning, Testing & Acceptance

Perform a three-phase commissioning procedure consisting of field I/O calibration and commissioning, system commissioning and integrated system program commissioning.

Document all commissioning information on commissioning data sheets, which shall be submitted prior to acceptance testing.  Commissioning work which requires shutdown of systems or deviation from normal function, shall wherever possible be performed when operation of the associated system is not required.

Commissioning shall be coordinated with the construction manager, maintenance operator and tenant to ensure systems are available when needed.

Maintenance operator personnel shall be informed of the proposed testing schedule so that authorized personnel are present throughout the commissioning procedure.

Prior to system program commissioning, verify that each control panel has been installed according to plans, specifications and approved shop drawing.  Test, calibrate and bring on line each control sensor and device.  Commissioning shall include, but not be limited to:

•        Sensor range.

•        Verify analog limit and binary alarm reporting.

•        Point value reporting.

•        Binary alarm and switch settings.

•        Actuator ranges.

•        Fair safe operation on loss of control signal, electric power, and network communications.

 

5.3.7.10.     Training

The controls specialist shall provide full instruction to designated personnel in the operation of the installed systems.  All training shall be held during normal working hours of 8:00 am to 4:30 pm weekdays.

 

 

 

 

 

 


 

5.4.          Care and Maintenance

Item

Frequency  of Maintenance

Maintenance Tasks.

Ductwork

Annually

The general inspection of ductwork installations shall consist of the following:

 

•        Check for any damage, loose           supports or suspensions, etc.

•        Clean and lightly lubricate (as           appropriate) the damper pivots           and linkages. Return to the “as           commissioned” positions, when           completed.

•        Inspect the ductwork insulation           for any damage and repair as           necessary to same specification.

•        Clean grilles/diffusers

•        The course of any stagnant water           and wet areas within or on           ductwork must be determined           and eliminated.

Pumps

Annually

Pumps to be checked annually in accordance with the manufacturers recommendations. Additionally the flexible anti vibration connections between the pump flange and the flanged pipe work should be changed every 5-8 years due to age hardening.

Fans

Annually

Fans to be checked annually in accordance with the manufacturers recommendations. Additional periodic checks of the fan operation and motor are recommended.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

Fire Dampers

6 Monthly

Manually actuate and check each damper for the correct operation.  Lubricate the mechanism.  Replace the fusible links if required.  Testing may possibly require witnessing by the Fire Authority representative.  Issue signed sheets to the Service Manager.

Pipe work and Valves

Annually

Operate all isolating valves/stopcocks through their full range of travel to ensure freedom of movement.  Check for any leakage, adjust or repack valve glands if necessary and where applicable.  Clean the valve, remove deposits and lubricate the valve stem.

  • Dismantle strainers/filters/dirt pockets, clean and refit.
  • Check the automatic air vents for satisfactory air discharge.
  • Test and check the operation of all safety valves.
  • Examine the insulation and repair as necessary.  Where fitted, the vapour barrier must be maintained.
  • Check the pipework installation for leaks.
  • Examine and check the security of fixings and supports.
  • Check that all identification bands are secure and in place.
  • Traps and waste pipe work should be flushed thoroughly via rodding eyes installed.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

Controls General

Annually

All control settings should initially be checked and noted. This includes set points but also differentials, proportional bands, authorities and integral times. This will then give a record of the original settings for checking purposes.

 

Adjustments of settings without a full appreciation of the implications can result in serious limitations in the control ability of the system.  Therefore a control specialist should only deal with any readjustments or corrections of faults.

 

Ensure that all the control setting knobs are as tamperproof as possible by keeping all covers securely in place, utilising and locking devices provided, or where possible by the removal of the knob on unprotected instruments. A sensing bulb that has been dented, bent, or damaged should be immediately replaced, even if it seems to operate correctly, as its calibration will probably be incorrect. It is recommended that a service agreement be taken out with the controls equipment supplier.

Control Panels

6 Monthly

Control panels installed are part of the building network and are not part of the reception area. Currently the reception devices have been networked together and shall be fully integrated to the new trend networked supervisor when the UPS works are undertaken.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

Air Environmental Management

6 Monthly

This should be carried in accordance with the specialist maintenance contractor’s recommendations for air sampling and ductwork cleaning.

Undertake routine safety audits and inspections and issue reports.

Ensure that the company’s Health and Safety policy contains up to date details of specific responsibilities, which have been allocated to individuals within the company organisation.

 

These responsibilities should include: -

a)       The overall responsibility for           implementing the health and           safety policy

b)       Bringing the health and safety           policy to the notice of all           employees

c)       The monitoring of health and           safety performance

d)       Liaison with enforcing authorities

e)       The management of the safety           committee and safety           consultation arrangements

f)       Retaining safety reference           documents

g)       The maintaining and checking           safety records

h)       The undertaking routine safety           audits and inspections

i)        Obtaining safety data sheets

j)       The identifying of training needs           and ensuring that they are           satisfied

k)       The selection and issuing of           personal protective equipment

l)        Ensuring that there are           satisfactory arrangements for           first aid

m)      Ensuring safety in relation to fire           risks and precautions

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

Statutory Audit

Annually

(Specialist Maintenance)

The company’s Insurance Agency shall undertake statutory audit and inspections of all equipment required by governmental statute to statutory and non-statutory items.  Ensure the company schedule of statutory/non statutory items is correct and up to date.

With any such visit from an inspection agency, a craftsman relevant to the given inspection should be made available to affect minor repairs and adjustments as may be required by the inspector and also to the preparation of such items for inspection.

 

 

5.4.1.           Safe Isolation

Item

Safe Isolation

Boilers

Switch to ‘off’ at control panel

Switch off local electrical isolator to isolate electrically

To isolate mechanically shut the valves at the rear of the boiler manifold

To isolate the gas shut the valve above the boiler and individual gas supply valves to each module

Pumps

Switch to ‘off’ at control panel

Switch off local electrical isolator to isolate electrically

To isolate mechanically close the isolation valves either side of the pump set

Fans

Switch to ‘off’ at control panel

Switch off local electrical isolator to isolate electrically

Gas Valve

Switch to ‘off’ at control panel

Switch off local electrical isolator to isolate electrically

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

5.4.2.           Maintenance Hazards

Potential Hazard / Note

Advice on minimising Hazard

Risk Assessment

A risk assessment must be carried out, the form completed and signed prior to commencing work.  Control measures must be taken if dictated by the result of the risk assessment.  Due regard must also be given to the Residual Hazards detailed in the appropriate section of the Health & Safety File.  Circumstances may dictate the issue of a “Permit to Work” and a written “Safe System of Work” Procedure.

Warning

Before commencing maintenance work on any items of plant ensure that the associated supplies have been isolated and locked off and that all control and ancillary circuits have been made dead.

Personnel

Inspection & Maintenance must only be performed by qualified Service Personnel with a demonstrable training record in the servicing of this type of equipment and who are equipped with the proper clothing, tools, etc.

Manufacturers Literature

These general maintenance guidance notes must be read in conjunction with the particular manufacturers’ recommendations: - For specific maintenance instructions of the equipment installed see Manufacturer’s Literature.

HVCA

These general maintenance guidance notes follow the standards & frequencies as recommended by the HVCA – Please refer to the HVCA Standard Maintenance Specification for Mechanical Services in Buildings Volumes 1 to 5.

Daily/Weekly Tasks

Routine Daily/Weekly inspections and tasks must form part of the maintenance routine and actions arising must be dealt with.

Specialist Equipment

It is recommended that a Maintenance Contract is placed for any specialist equipment installed. All work must be carried out in accordance with all relevant Regulations, Acts, Codes of Practice, British Standards and Guidance Notes etc. :-

 

The following  list of legislation whilst it is comprehensive, it does not claim to cover all relevant documentation:

Legislation

The Health and Safety at Work etc. Act 1974

Factories Act 1961

Housing Grants, Construction & Regeneration Act 1996

Control of  Pollution Act 1974

Model Water Bye-Laws

 

 

 

 

 

 

 

 


 

Regulations

Health & Safety Electricity at Work Regulations SI635 1989

Construction (Lifting Operations) Regulations 1961

Construction (General Provisions) Regulations 1961

Construction (Working Places) Regulations 1961

Construction (Health and Safety) Regulations 1966

Control of Substances Hazardous to Health Regulations 1988 (and amendments)

Noise at Work Regulations 1990

The Management of Health and Safety at Work Regulations 1992 and Approved Code of Practice

The Workplace (Health, Safety and Welfare) Regulations 1992

The Health and Safety (Display Screen Equipment) Regulations 1992

The Manual Handling Operations Regulations 1992

The Personal Protective Equipment at Work Regulations 1992

The Provision and Use of Work Equipment Regulations 1992

Abrasive Wheel Regulations 1970

Construction (Design and Management) Regulations 1994

Health and Safety (First Aid) Regulations 1981 and Approved Code of Practice and Guidance 1997

Construction (Health and Welfare) Regulations 1984

Safety Signs Regulations 1996

Pressure Systems and Transportable Gas Containers Regulations 1989

Gas Safety (Installation & Use) Regulations 1998

High Flammable Liquid and Liquefied Petroleum Gases Regulations 1972

Reporting of Injuries, Diseases and Dangerous Occurrences Regulations 1995

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

5.4.3.           Fault Finding

5.4.3.1.        General Notes

Fault tracing of the electrical installation or appliances that are connected to the installation should only be carried out by suitably trained competent personnel.

Whenever possible all fault tracing should be carried out on circuits, appliances or components after they have been suitable isolated from the main supply.

 

When it is not possible to carry out fault tracing on a "dead" installation, then the fault tracing must be carried out by a minimum of two people.

 

Prior to carrying out any fault tracing it is essential that the personnel involved read the health and safety section of this manual and familiarize themselves with the operation and maintenance sections.

 

 

5.4.3.2.        Preliminary Investigation

Following a reported failure of an appliance, the likely cause can be quickly established by asking the relevant question of those in the vicinity of the failure.

 

a)       Was the appliance or component operating when it failed, or did it fail to start?

b)       Do other items of equipment on the same circuit still operate?

c)       Has the correct operating procedure been carried out?

d)       When was the last time the component/appliance was used?

e)       Had there been any signs of deterioration in the performance or any increase in noise levels from the appliance/component?

f)       Has there been any maintenance work carried out prior to the failure?

g)       Has any work been carried out in the vicinity of the failure, or along the route of the failed circuit prior to the failure?

h)       Has anyone else investigated the failure prior to those now required to do so and if so what did they do and what did they find out?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

5.4.3.3.        Mains Water

Symptoms

Possible Cause

Checks

Insufficient Flow

Valves

Check that all isolating valves and stop cocks are open.

Leakage

Check Pipework for signs of leakage.

Water Authority

Check with local water authority for a change in main distribution system.

Excessive Flow

Water Authority

Check with local water authority for a change in main distribution system.

No Flow

Valve

Check isolating valves and stop cocks are open.

Water Authority

Check with the local water authority for a fault in the main distribution system.

Excessive

Pressure

Water Authority

Check with the local water authority for a change in main distribution system

Insufficient

Water Softness

Excessive Flow

Check for an excess of flow.

Water Softener

Check level of softening salt.

 

Check for correct operation of sensors.

 

Check for correct response at controller.

 

Check that local isolator is on and electrical supply is available.

Incoming Condition

Check with local water authority for a change in the incoming water hardness.

Excessive Noise

Excessive Pressure

Check for an excess of pressure.

Pipework

Check security of Pipework supports.

Air

Check Pipework for air locks.

Excessive

vibration

Pipework

Check security of Pipework supports.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

5.4.3.4.        Low Pressure Hot Water Heating System

Symptoms

Possible Cause

Checks

Insufficient

Flow

Pump

Check for correct supply voltage.

Check for correct pressure differential across pump.

Refer to the Plant Data.

Check for correct speed setting.

Check that there is no air trapped in impeller casing.

Valves

Check that isolating valves are open.

System out of balance

Check double regulating valves have been returned to their correct setting after maintenance.

Blockage

Check high points for air locks.

Take temperature readings at regular intervals along pipework to determine location of blockage.

Leakage

Check system for signs of leakage.

Control valves

Check for correct operation of sensors.

Check for correct response at control valve.

Check for correct operation of control actuator.

Check for correct operation of control valve.

Excessive Flow

Pump

Check for correct supply voltage.

Check for correct speed setting.

Valves

Check that isolating valves are not closed to other parts of the system.

System out of

balance

Check the double regulating valves are at their correct setting after maintenance.

Control Valves

Check for correct operation of sensors.

Check for correct response at controller.

Check for correct operation of control actuator.

Check for correct operation of control valve.

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

Symptoms

Possible Cause

Checks

Over Heating

Insufficient Flow

Check for correct operation of thermostats or sensors.

Check control valve is operating correctly.

Check control valve actuator is operating correctly.  Check bypass around control valve is closed.

Check for correct response at controller.

Boilers

Check for correct operation of control thermostat and high limit cut out thermostat.

Controls

Check for correct operation of thermostats or sensors.

Check control valve is operating correctly.

Check control valve actuator is operating correctly.      Check bypass around control valve is closed.

Check for correct response at controller.

Under Heating

Excessive Flow

Check for an excess of flow.

Controls

Check for correct operation of thermostat or sensor.

Check control valve is operating correctly.

Check control valve actuator is operating correctly.

Check bypass around control valve is closed.

Check for correct response at controller.

Low External

Ambient Temp.

Check external temperature is not below design conditions.

Boilers

Check boilers are at correct operating temperature.

Valves

Check all circuit valves are set correctly.

Blockage

Check high points for air locks.

Take temperature readings at regular intervals to determine location of blockage.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

Symptom

Possible Cause

Checks

Insufficient Air

Fan not producing

duty

Check for correct supply voltage.

Check drive belts for wear and correct tension.

Check for physical damage to impeller or casing to ensure free rotation.

Check condition of bearings.

Dirty Filter

Check pressure difference across filter is within tolerable limits.

System out of

balance

Check volume control damper settings.

Check terminal units for free air flow.

Fire dampers tripped

Visually inspect for correct position.

Restriction to air

flow in system

Check inlet and outlet louvres for any obstructions.

 

Take pressure readings at regular intervals in the ductwork to determine location of restriction.

 

Where possible check the condition of:­

a)     Turning vanes.

b)       Dampers.

c)     Attenuators.

d)       Coils.

Check for physical damage to ductwork.

Excessive Air

Fans producing

excess duty

Check for correct supply voltage.

Check for correct drive belt tension.

Missing Filter

Media

Check integrity of filter medium.

System out of

balance

Check volume control damper settings.

Check that all terminal units are correctly fitted.

Missing equipment

Check all equipment has been replaced after maintenance.

 

 

 

 

 

 

 

 

 

 

 

 

 


 

Symptom

Possible Cause

Checks

Excessive Air

Fans producing

excess duty

Check for correct supply voltage.

Check for correct drive belt tension.

Missing Filter

Media

Check integrity of filter medium.

System out of

balance

Check volume control damper settings.

Check that all terminal units are correctly fitted.

Missing equipment

Check all equipment has been replaced after maintenance.

No air

Fan not working

Check that the controls are calling for the fan to run.

Check electrical supply to fan.

Check operation of motor.

Check for wear and correct drive belt tension.

Check for physical damage to impeller or casing to ensure rotation.

Check condition of bearings.

Dampers

Check dampers are in their correct position.

Blockage

Check condition of:­

a)       Filters.

b)       Coils.

C)      Turning vanes.

d)     Inlet/outlet louvres.

e)     Terminal Units.

f)       Attenuators.

g)       Fire/smoke dampers.

Over Heating

Insufficient air

volume

Check for insufficient air volume. Refer to previous procedure.

Excessive heat input

Check for correct operation of thermostats or sensors.

Check flow temperature is correct for system.

Check control valve is operating correctly.

Check control valve actuator is operating correctly.

Check for correct response to input at controller.

Check for correct operation of high temperature cut-out.

 

 

 

 

 

 

 

 

 

 


 

Symptom

Possible Cause

Checks

Under Heating

Excessive air

volume

Check for excessive air volume.

Insufficient heat

input

Check for correct operation of thermostats or sensors.

Check flow temperature is correct for system.

Check control valve is operating correctly.

Check control valve actuator is operating correctly.

Check for correct response to inputs at controller.

Check for correct operation of high temperature cut-out.

Low external

ambient temperature

Check if external temperature is below design conditions.

Excessive

vibration

Fan

Check condition of bearings.

Check if impeller is out of balance.

Check condition of anti-vibration mounts.

Excessive noise

Fan

Check for correct supply voltage.

Check drive belts for wear and correct tension.

Check for physical damage to impeller or casing and free rotation.

Check condition of bearings.

Check impeller is secured to shaft.

System out of

balance

Check volume control damper settings.

Check terminal units for free air flow.

Restriction to air

flow in system

Check inlet and outlet louvres for obstructions.

Take pressure readings at regular intervals along the ductwork to locate restriction.

Where possible check condition of.­

a)       Turning vanes.

b)     Coils.

c)       Dampers.

d)       Attenuators.

Check for physical damage to ductwork.

Excessive

Smutting

Dirt build-up in

system

Where possible check condition of internal surfaces of ductwork.

 

 

 

 

 

 

 

 


 

Symptom

Possible Cause

Checks

Obnoxious

odours

Fan

Check motor and bearings for overheating.

Heater batteries

Check coil matrix for dirt build up.

Incoming air

Check quality of intake supply air.

Insufficient air change rate

Check for insufficient air change rate.

 

 

5.4.4.           Electrical Control Systems

A.     All control settings should initially be checked and noted. This includes not only set-points, but also differentials, proportional bands, authorities, integral times etc. This will then give a record of the original settings for future checking purposes and will be invaluable if any settings are later accidentally disturbed.

 

B.     It should be appreciated that control systems can be very complex. Adjustment of settings without a full appreciation of the implications can result in serious limitations in the control ability of the system. Any re-adjustment or correction of fault should only be dealt with by a controls specialist.

 

C.     When a temperature sensing bulb or probe is located in a pocket and therefore not directly in contact with the medium it is monitoring, it must be ensured that the bulb is not insulated by an air gap from the medium being monitored. This should be achieved by ensuring that any space between the bulb and the pocket in which it is housed, is filled with oil or grease. Similarly a build-up of dirt on a direct sensing probe can act as an insulator, therefore, these must be kept clean.

 

D.     Ensuring that all control setting knobs are as tamper-proof as possible by keeping all covers securely in place, utilising any locking devices provided, or where possible, by the removal of the knob on unprotected instruments.

 

E.     A sensing bulb that has been dented, bent or damaged should be immediately replaced, as, even if it seems to operate correctly, its calibration will probably be out.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

5.5.          Health and Safety

5.5.1.           General

YOUR ATTENTION IS DRAWN TO REQUIREMENTS OF THE HEALTH AND SAFETY AT WORK ACT AND ALL ASSOCIATED REGULATORY BODIES

 

The emergency procedures are intended, as a guide only, for each emergency situation that arises has to be taken in the light of its degree of severity and the conditions prevailing at the time.

 

When an emergency situation is encountered it is imperative that calmness prevails. Measures and actions taken and made in haste or panic will not only in all probability, be wrong, but could spread panic in other people.

 

A few minutes spent in rationalising the situation and planning your course of actions, even in an emergency of the utmost gravity, will save time and possible injury in the long run.

 

Never take risks in an emergency, for a risk can turn a minor emergency into a major one. The safety of personnel must always come first.

 

Any temporary repairs effected or arrangements made during or after an emergency must be corrected as soon as it is practically possible.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

5.5.2.           Emergency Procedures

Failure of Electrical Supply

 

This describes the general steps to take on failure of the electrical supply.

•        Ascertain whether the failure is local Or GENERAL

•        Check whether general lighting and power is Affected.

•        If failure is local, check whether fuses have blown. Replace with. correct size fuses as required

•        For full information refer to the Electrical Services manual and associated Drawings.

•        A fully qualified electrician should only undertake repairs to electrical switchgear and cables.

•        If the failure is general, isolate the supply to items of plant until supply is restored.

 

 

Water Leaks

 

This procedure describes the action to be taken in the event of a water leak.

A competent tradesman only should perform welding tube or replacement fittings, etc.

 

•        Ascertain where leak is coming from check the severity of the leak and damage done by water so far and place suitable receptacle under to prevent any further damage by water. If water has found its way into any electrical trunking, switchgear or apparatus, electrically isolate circuit and/or plant.

•        Locate nearest stop cock and or isolation valve and turn off.

•        Inform personnel affected by this action that service will or has been cut off  

•        Drain down isolated section or plant.

•        Ascertain type of leak, i.e., hole in pipework, split fitting, valve damaged, etc. Should replacement part be required, arrangements can be made to get part prior to commencing remedial work

•        Repair leak

•        Air pressure test repair. (if possible)

•        On successful pressure test, refill drained down section or plant.

•        Open valves used for isolating to their correct settings.   

•        Keep close check for leaks until satisfied all is safe

•        Energise isolated electrical circuit and/or plant when dried out and certified safe by a competent electrician.        

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

Fire

 

This procedure describes the general action to take in the event of fire breaking out and is not intended to override or supersede any safety policy or fire procedure adopted by the occupier.

 

•      Always inform the FIRE BRIGADE should fire break out and NEVER attempt to fight it alone.

 

•      NEVER use a liquid type extinguisher to fight electrical fires.

 

•      Under most conditions occurrence of a fire will be detected by the automatic detection equipment. However, for condition and certain locations, the break-glass" fire alarm should manually be activated.

 

•      In the event of a fire alarm being activated the building should be evacuated in accordance with the building fire procedure policy.

 

•      ONLY ATTEMPT TO CONTAIN A FIRE WITH THE FIRE EXTINGUSHERS PROVIDED AND IF THE ACTION WILL NOT PUT INDIVIDUALS AT RISK OF INJURY.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

5.6.          Manufacturers Information

1. Description of Item

Air Handling Unit

Colour/Code/Ref/Batch number/

Type 100

Location

External

Manufacturer

Contact details

Ciat OzonAir

Bourne House

475 Godstone road

Whyteleafe

CR3 0BL

 

Tel:     01883 621 015

Manufacturers Literature

Click to view Product Data Sheet

Click to view Controls Philosophy

 

 

2. Description of Item

Air Handling Unit

Colour/Code/Ref/Batch number/

Type 75

Location

External

Manufacturer

Contact details

Ciat OzonAir

Bourne House

475 Godstone road

Whyteleafe

CR3 0BL

 

Tel:     01883 621 015

Manufacturers Literature

Click to view

 

 

3. Description of Item

Fixed Blade Swirl Diffusers

Colour/Code/Ref/Batch number/

SDFC SDFS

Manufacturer

Contact details

Waterloo Air Products plc

Quarrywood Industrial Estate,

Aylesford, Kent.

ME20 7NB

 

Tel:     01622 717 861

Fax:    01622 710 648

E-mail:sales@waterloo.co.uk

Manufacturers Literature

Click to view

 

 

 

 

 

 

 

 

 

 

 


 

4. Description of Item

Drum Het Diffusers

Colour/Code/Ref/Batch number/

WDJ

Manufacturer

Contact details

Waterloo Air Products plc

Quarrywood Industrial Estate,

Aylesford, Kent.

ME20 7NB

 

Tel:     01622 717 861

Fax:    01622 710 648

E-mail:sales@waterloo.co.uk

Manufacturers Literature

Click to view

 

 

5. Description of Item

Nuaire Fan Data/Speed Controller

Colour/Code/Ref/Batch number/

NALTF4

Manufacturer

Contact details

The Nuaire Group

Western Industrial Estate

Caerphilly

CF83 1NA

 

Tel:     08705 121 400

Fax:    0844 583 0033

E-mail: info@nuairegroup.com

Manufacturers Literature

Click to view Product Data Sheet

Click to view Controller Data Sheet

 

 

6. Description of Item

Functional Controls

Colour/Code/Ref/Batch number/

North Compound AHU1, South Compound AHU2

Ground Floor System VRF, First Floor System VRF

Manufacturer

Contact details

Aquila Mechanical

Unit A The Enterprise Centre

Cricket Lane Beckenham

Kent

BR3 1LH

 

Tel:     01342 825 517

E-mail: graham@aquilamechserv.co.uk

Manufacturers Literature

Click to view Functional Controls Schematic

 

 

 

 

 

 

 

 

 

 

 

 

 


 

7. Description of Item

Universal Controllers

Colour/Code/Ref/Batch number/

Synco 200 RLU2

Manufacturer

Contact details

SIR William Siemens Square

Frimley

Camberley

Surrey

GU16 8QD

 

Tel:     01276 696000

E-mail: info.cc.uk@siemens.com

Manufacturers Literature

Click to view

 

 

8. Description of Item

Sanitary Ware

Colour/Code/Ref/Batch number/

See Schedule

Manufacturer

Contact details

Neville Lumb

318-326 Southbury Road

Enfield

Middlesex

EN1 1TT

 

Tel:     020 8804 8244

Fax:    020 8804 2876

Manufacturers Literature

Click to view Sanitary Ware Schedule

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

5.7.          Test and Commissioning Certificates

Description

Certificate

Primary Air Balancing – Phase 1

Click to view

Duct Work Cleaning Report

Click to view

Secondary Air Balancing

Click to view

Condensate Test Sheets

Click to view

Pressure Test Completion Certificate – Phase 1

Click to view

Pressure Test Completion Certificate – Phase 2

Click to view

Water treatment

Click to view

WC Extract Balancing

Click to view

A/C Commissioning Data

Click to view

Anteros House Certification

Duct Work Cleaning Report

Click to view

FRESH AIR SYSTEM 3 Commissioning Certificate

Click to view

Extract Commissioning Certificate

Click to view

Ground Floor Condensate Certificate

Click to view

Ground Floor VRF Pressure Testing Certificate

Click to view

Ground Floor (System 3) Secondary Air Commissioning Sheets

Click to view

A/C Unit commissioning Sheets

Click to view

A/C Unit commissioning Sheets

Click to view

 

 

 

5.8.          Record Drawings

Drawing Number

Drawing Title

Rev

Issue Date

Checked

AQU-11038-M-100

Ground Floor Ventilation VRF Layout System 1

A

08/09/201

-

AQU-11038-M-101

Ground Floor Ventilation VRF Layout System 2a _ 2B

A

08/09/2011

-

AQU-11038-M-102

Ground Floor Ventilation VRF Layout System 3

C1

01/08/2011

-

AQU-11038-M-103

First Floor Ventilation VRF Layout System 4

A1

08/09/2011

-

AQU-11038-M-104

First Floor Ventilation VRF Layout System 5a _ 5B

A1

08/09/2011

-

AQU-11038-M-105

First Floor Ventilation VRF Layout System 6a_ 6B

A1

08/09/2011

-

AQU-11038-M-200

Ground Floor Ductwork Layout System 1

A1

08/09/2011

-

AQU-11038-M-201

Ground Floor Ductwork Layout System 2a_ 2b

A1

08/09/2011

-

AQU-11038-M-202

Ground Floor Ductwork Layout System 3

C1

01/08/2011

-

AQU-11038-M-203

First Floor Ductwork Layout System 4

A1

08/09/2011

-

AQU-11038-M-204

First Floor Ductwork Layout System 5a_5b

A1

08/09/2011

-

 


 

 

 

 

 

 

AQU-11038-M-205

First Floor Ductwork Layout System 6a_6b

A1

08/09/2011

-

AQU-11038-M-206

Roof Mechanical Plant Layout

C1

01/08/2011

-

AQU-11038-M-207

Ground Floor System 3 Works Phasing Layout

C1

02/08/2011

-

AQU-11038-M-208

Ground Floor Over-door Heater Layout

A1

08/09/2011

-

AQU-11038-M-300

Ground Floor Toilets Hot and Cold Water Services Layout

A1

08/09/2011

-

AQU-11038-M-301

First Floor Toilet hot and Cold Water Service Layout

A1

08/09/2011

-

AQU-11038-M-302

Ground Floor Toilets Soil _ Waste Layout

A1

08/09/2011

-

AQU-11038-M-303

First Floor Toilets Soil _ Waste Layout

A1

08/09/2011

-

AQU-11038-M-400

Ground Floor System 1 VRF Ventilation System

A1

08/09/2011

-

AQU-11038-M-401

Ground Floor System 2a _2b VRF Ventilation System

A1

08/09/2011

-

AQU-11038-M-402

Ground Floor System 3a _ 3b VRF Ventilation Schematic

A1

08/09/2011

-

AQU-11038-M-403

First Floor System 4 VRF Ventilation System

A1

08/09/2011

-

AQU-11038-M-404

Ground Floor System 5a _ 5b VRF Ventilation Schematic

A1

08/09/2011

-

AQU-11038-M-405

First Floor System 6a – 6b VRF Ventilation Schematic

A1

08/09/2011

-

AQU-11038-M-406

North Compound AHU 1 Ventilation Schematic

A1

08/09/2011

-

AQU-11038-M-407

South Compound AHU 2 Ventilation Schematic

A1

08/09/2011

-

AQU-11038-M-408

Functional Controls Schematic

A1

08/09/2011

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

Back

 

6.          Detailed Table of Contents

Contents of Mechanical Section. 2

1.      Introduction. 3

2.      Contract Directory. 4

3.      Residual Risk Assessment 5

4.      General Scope of Mechanical Works. 6

5.      Mechanical Services. 7

5.1.          Contractor 7

5.2.          Scope of Works 7

5.2.1.      Introduction. 7

5.2.2.      Works Description. 7

5.3.          Operating Procedures 8

5.3.1.      General Note to User 8

5.3.2.      Mechanical Services 8

5.3.3.      Ares Building. 9

5.3.4.      Ventilation Supply/Extract 16

5.3.5.      Toilet Extract Systems 20

5.3.6.      Door Curtain. 21

5.3.7.      Automatic Controls 21

5.4.          Care and Maintenance. 25

5.4.1.      Safe Isolation. 29

5.4.2.      Maintenance Hazards 30

5.4.3.      Fault Finding. 32

5.4.4.      Electrical Control Systems 39

5.5.          Health and Safety. 40

5.5.1.      General 40

5.5.2.      Emergency Procedures 41

5.6.          Manufacturers Information. 43

5.7.          Test and Commissioning Certificates 46

5.8.          Record Drawings 46

6.      Detailed Table of Contents. 48