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JCL CONSULTANTS LTD
TECHNICAL SPECIFICATION
for
AIR-CONDITIONING & MECHANICAL VENTILATION
SYSTEM INSTALLATION
at
Saigon Pearl Development at Nguyen Huu Canh Street
Ward 22, Bink Thanh District
Ho Chi Minh City, Vietnam
Prepared by: JCL Consultants Ltd.
16C Seabright Plaza,
9 Shell Street,
North Point,
Hong Kong
(479m 19/12/05)
JCL CONSULTANTS LTD
Job No. 479-M 19 December, 2005
SPECIFICATION FOR AIR-CONDITIONING AND MECHANICAL VENTILATION
INSTALLATION
TABLE OF CONTENT
==================
1.SCOPE OF WORK
2. GENERAL REQUIREMENTS
3.PRODUCTS AND WORKMANSHIP
A. Water Cooled Chillers
B. Air Cooled Split Air-conditioning Units
C. Pumps and Cooling Towers
D. Fan Coil Units, Air Handling Units and Ventilation Equipment
E. Pipework, and Fittings
F. Ductwork and Fittings
G. Thermal Insulation

H. Acoustic and Vibration Isolation
I. Automatic Control Systems
J. Electrical Wirings
K. Miscellaneous Provision
4. TESTING/COMMISSIONING, LABEL, PAINTING, MAINTENANCE AND
SPARES
4.1 Testing and Commissioning
4.3 Painting
4.4 Maintenance and Spares
5. DRAWING LIST
INFORMATION TO BE SUBMITTED BY TENDERER
I.SCHEDULE OF MATERIALS/EQUIPMENT
II.SCHEDULE OF QUANTITIES AND UNIT RATES
III.SUMMARY OF TENDER
I. SCHEDULES OF MATERIALS/EQUIPMENT
II. SCHEDULES OF QUANTITIES AND UNIT RATES
III. SUMMARY OF TENDER
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SPECIFICATION FOR AIR-CONDITIONING AND MECHANICAL VENTILATION
INSTALLATION
1. SCOPE OF WORK
1.1 Supply and install the complete air-conditioning and mechanical ventilation installation in
accordance to the drawings and specifications, including:-
a. Chilled water and condensing water systems including chillers, cooling towers, pumps,
chilled water/condensing water circulating pipework, valves, controls, feed and
expansion tanks, etc.
b. Split-type air-cooled A/C units for the building including all indoor units, outdoor
condensing units, refrigerant pipe, condensate pipes and controls. Metal trunking shall
be provided for refrigerant pipe whenever exposing to sunlight/outdoor.

c. Complete air distribution system including fan coil units and air-handling units.
d. All supply air ducts and fittings including manual and motorized volume control
dampers, fire dampers etc.
e. Central fresh air supply system including air-handling units, ductwork and controls.
f. Supply / exhaust air and ventilation system for carpark (including CO monitoring
system), lavatories and mechanical/electrical rooms including propeller fans, axial fans
and/or centrifugal fans.
g. All thermal insulation associated with the ACMV installation.
h. All acoustic work including silencers and vibration isolators associated with the
ACMV installation.
i. Pressurization system for staircases and buffer rooms of residential towers.
j. Water treatment system for chilled water and condensing water system.
k. Electrical installation commencing from and including the Motor Control Centre for
the chillers, chilled water pumps and air handling units.
Electrical installation shall include all conduits/wirings, cable trays/trunkings, starters
and control for each equipment.
l. Automatic electrical control system including thermostats, control valves, control
wirings and other necessary equipment/accessories.
m. Others ancillary items for the complete execution of the job:-
- The supply and installation of sleeves through structural and non-structural walls,
floors for the pipework, electrical work and duct penetrations with fire rated
material back sealing .
- Provision of all steel beams, steel brackets, holding down bolts, spigots, etc. for
the erection of the ACMV equipment and pipework.
- Provision of overflashing of all penetration, sealing and making good of same.
- Provision of fire rated ducting as required and indicted on the drawings.
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1.2 The scope shall also include the following items of work for the complete and proper
execution of the contract:-

a. Submission of shop drawings and samples.
b. Painting of materials/equipment.
c. Testing and commissioning.
d. Provision of twenty-four (24) months operational maintenance and breakdown
services.
e. Provision of 3 sets of operation/maintenance manuals and as-fitted drawings including
electronic files in AutoCAD 2004 format The as-fitted drawings shall include the
complete installation layouts and schematic diagrams.
f. Provision of spare parts for 2 years.
1.3 Responsible for application to Project Manager / Authorities for all testing and inspection of
the electrical installation if required.
All electrical installation under the scope of this contract shall be designed, installed,
inspected and tested in accordance with the specification specified in Electrical Package.
1.4 Responsible for application to Fire Protection Department for all testing and inspection of
the ventilation system installation if necessary.
1.5 Setting out and supervision during construction to the works executed by the main
contractor and/or by other contractors related to the ACMV works:-
a. Construction of riser air ducts.
b. Holes sleeves reservation.
c. Any plinth and inertia block for ACMV equipment.
1.6 Responsible for training of Employer’s staff for the proper operation of the entire ACMV
system.
1.7 Associated Work for ACMV Installation
The following works associated with ACMV installation shall be provided by others under
the building contract and other M & E services contract.
a. Works Provided Under the Building Contract
- Concrete plinth and inertia block for ACMV equipment. (However, the ACMV
Contractor shall furnish operating weights and relevant structural loading
information to Project Manager for calculation and placement of reinforcement.)
- External wall louvres.

- Enclosure or suspended ceilings of adequate fire resistance for housing air ducts
and pipe runs through protected areas.
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b. Works Provided Under Electrical Contract
Electrical power supply for the following ACMV equipment up to the main isolating
switch for each equipment:-
- Fan coil units.
- Ventilation fans.
- Split A/C indoor units.
c. Works Provided Under the Hydraulic Contract
- Water supply to make-up water system for chilled water and condensing water
system.
- Flashing for all penetrations.
d. Works Provided Under the Fire Services Contract
- Interface between the fire indicator panel and the carpark exhaust fans and the
staircase pressurization fans complete with control switches and status
indications.
2. GENERAL REQUIREMENTS
2.1 All works and materials to be used shall comply with requirements, regulations, standard
and codes of the following parties:-
a. The Building Department.
b. The Water Authority.
c. Environmental Department.
d. Fire Protection Department
e. Electrical Engineer
2.2 All equipment and materials delivered to site shall be brand-new complete with
manufacturers’ labels and specifications.
2.3 Power Supply
Power supply for the project shall be 380V, 3-phase, 50Hz ± 5%.

2.4 Temperature & Humidity Required In Club House & Apartment Area
Temperature = 24 ± 2°C
R.H. = 65%
The Contractor shall ensure the specified condition can be achieved.
2.5 Shop Drawings
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Prior to commencement of installation, the Contractor shall submit shop drawings showing
details of equipment / piping layout, methods o construction / fixings and builders works for
the ACMV installation to the Project Manager for review and approval.
Shop drawings are to include :-
a. Schematics and schedule
b. Plans (minimum in 1:100 scale)
c. Sections and elevations (minimum in 1:50 scale)
d. Details (minimum in 1:25 scale)
2.6 Co-ordination Between Trades
The Contractor shall liaise with other Contractors and tradesmen who will be carrying out
other services work on the site, prior to the commencement of actual installations, so as to
ensure that the work of all trades will be co-ordinated.
The Contractor shall note the restricted space available in certain service ducts and the
absolute necessity to ensure that all installation is carried out in the correct sequence,
manner and position to facilitate proper operation and maintenance.
During the preparation of shop drawings, the Contractor shall liaise closely with other
contractors to ensure complete co-ordination of services installed by all parties. Maximum
headroom and minimum installation space shall be maintained at all points. Where
headroom or space conditions appear inadequate, the Project Manager shall be notified
before proceeding with installation.
The Contractor shall make reasonable modifications in the layout as needed to prevent
conflict with work of other trades for the proper execution of work.
The Contractor shall include all necessary bends, tees and the like to divert pipes, conduits,

ducts to avoid structural obstacles and any other electrical and mechanical services
installations to reach the designated locations.
Prior to commencement of work, the Contractor shall be responsible to verify all levels and
gradients shown on drawings and to ascertain that condition on site permit execution of
work as shown on drawings.
The Contractor shall be responsible for the timely installation and coordination with the
General Contractor for the installation of any ducting, conduiting, sleeves or any other
materials relating to the ACMV system that are required to be cast into slabs or the like.
2.7 Submissions
The Contractor shall carry out submission for the Project Manager’s approval for
equipment and examination of shop drawings in a timely manner according to the main
construction programme. The submission programme shall include the following details:
a. Proposed submission dates.
b. Proposed dates for approval by Project Manager to meet the delivery schedule or
installation programme.
The Contractor shall include the cost of the submission of the drawings and equipment to
all relevant Authority for approval, if required. The Contractor shall also allow for any
additional cost for the laboratory testing of equipment if required by relevant Authorities.
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2.8 Mock-up Installation
The Contractor shall allow the cost of installation of mock-up installations on site inside
pipe ducts and other critical areas as directed by the Project Manager.
3. PRODUCTS AND WORKMANSHIP
A. Water Cooled Chillers
PRODUCT
A101 GENERAL
1. Water-cooled chiller (of not more than 0.8KW/TR) offered shall be single unit
which is completely factory-assembled, piped, leak tested, wired and charged
with refrigerant (R134a of zero ozone depletion). It shall include but not limited

to compressor, hermetic motor, chiller, water-cooled condenser, refrigerant
control centre, purge unit, starter, controls, refrigerant piping and control, and
watertight equipment cabinet, all mounted on a continuous structural base. The
capacity and performance rating are specified in equipment schedule which shall
be nett after derating due to location and site restriction etc.
2. All factory applied acoustical and thermal insulation, including facing and
adhesives shall be fire-resistant and conform to requirements of NFPA and local
codes.
3. Where corrosion can occur appropriate corrosion resistant materials and assembly
methods must be used including isolation of dissimilar metals against galvanic
interaction.
4. Locate and arrange motors, belts, filters, coils and other components and
accessories so that they are accessible for repair, maintenance and replacements.
A102 CASING
1. Construct of heavy gauge industrial type galvanized steel panels.
2. Bonderize each panel to remove grease and dirt after fabrication.
3. All metallic part shall be treated and painted with primer and paint to resist
atmospheric corrosion.
Coating system shall be UL approved.
4. Screws shall be cadmium plated or stainless steel.
5. Panel shall be of interlocking design and the base shall be related be raised to
prevent water from entering unit.
6. Securely bolt panels and reinforce in critical areas to form a rigid and durable
structure.
7. Fabricate structural frame with members rigidly braced to hold all parts in line
and to prevent any change in shape when operating.
8. Structural frame shall be of welded construction with slag and splatter removed
after welding.
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9. Paint welds with two coats of an approved primer, followed by two coasts of
chemical resistant paint.
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A103 SCREW COMPRESSOR, HERMETIC TYPE
1. Screw compressors shall have quiet operation with oil injection lubrication
system. Open compressors shall have a rotary seal fitted to the driving shaft
which effectively prevents leakage of refrigerant or oil. Hermetic compressors
shall be driven through a flexible coupling of a type which enables the shaft seal
to be removed without moving compressor or motor.
2. A device shall be fitted to prevent the pressure differential across the compressor
causing backward rotation at a normal or emergency stop.
3. The lubrication system shall be arranged with an interlock to ensure adequate oil
pressure at all bearings before the compressor starts. A hand reset pressure or
flow switch for stopping the compressor shall be fitted at an appropriate location
from the oil pump delivery pipe to the oil sump. A replaceable or
thermostatically controlled oil cooler shall be used to remove the heat gained by
the oil in the rotor chamber or the chiller manufacturer shall select and confirm
that the lubrication oil used can be operated at a temperature higher than the rotor
chamber. The oil sump shall have a thermostatically controlled electric heater
which operates while the compressor is at rest.
4. The compressor shall have automatic capacity control equipment which will
control at any point between 10% and 100% of full duty via control of the
compressor speed by variable speed drive or slide valve. For compressor with
stepped capacity loader control, each chiller shall have capacity control steps
and the minimum step capacity shall be maximum 20% of full load. The
compressor shall be fitted with a device which ensures that it cannot start unless
in the fully unloaded condition.
Unless otherwise specified , the hot gas by-pass or injection system of capacity
control will not be accepted.

The motor of a semi-hermetic compressor which is refrigerant gas cooled shall
have built-in protection against inadequate cooling.
The following fittings shall be provided and connected:-
a) Stop valves on refrigerant discharge and suction.
b) Refrigerant pressure gauges .
c) Oil pressure gauge .
d) Oil sum or reservoir level sight glass.
e) Pressure safety cut-outs .
f) Low oil pressure or flow switch with hand reset.
g) High oil temperature cut-out with hand reset.
h) Instrument mounting.
i) Liquid line filter drier.
j) Liquid line solenoid valve.
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k) Refrigerant charging valve.
l) Discharge line sound reduction kit.
Alternatively, pressure measurements read form the display of the chiller is
acceptable.
A104 WATER COOLED CONDENSER, SHELL AND TUBE
(FRESH COOLING WATER APPLICATION)
1. Condensers shall be of the manually cleanable type capable of being re-tubed ‘in-
situ’.
2. For fresh water condenser cooling applications, the condenser shall be of steel and
the water boxes/end covers shall be of steel or cast iron.
3. The tubes shall be of copper, aluminimun brass, cupro-nickel, grade 316 stainless
steel or tube plates stainless 316 to ASTM A240/A240M or as otherwise
indicated in the Specification. The tube plates may be of the same alloys or
alternatively made in mild steel with a ‘Cladding’ of stainless steel.
4. Internal baffles and other fittings in either water or refrigerant circuits shall be

made of material such that they will not corrode or set up corrosion or permit
electro-chemical action with the liquids and/or other materials used in the
condensers.
5. End water boxes shall be designed to provide adequate space for water movement
such that there is no erosion of the tube ends. In general, this requires the water
box end to be domed rather than flat. The water boxes shall be epoxy resin
coated internally to prevent corrosion.
6. End box covers shall be removable, and allow easy access for cleaning the tubes.
Means shall be provided for venting and draining of the water side of the unit.
7. The design fouling factor on the water side of the tubes shall be 0.000044 m
2
°C/W for cooling tower fresh water.
A105 EVAPORATOR
1. Evaporator shall match with all other components for cooling requirements and
performance.
2. Evaporator shall be direct expansion shell and tube type.
3. Evaporator outer shell and suction line insulated with minimum 50mm thick
flexible closed cell plastic insulation or 100mm fibre glass insulation.
4. Maximum water velocity shall not exceed 2.5 metre per second.
5. Refrigerant side shall be designed as per ASME Code for pressure vessels of the
unfired type for the refrigerant used.
6. Water side and water box shall be designed for 1000 kPa working pressure and
1500 kPa test pressure.
7. Evaporator shell construction shall be such that the tube bundle may be removed
and/or cleaned without dismantling and pipe work.
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8. Evaporator tubes shall be seamless copper tubes rolled into the tube sheets.
9. Refrigerant circuit components generally include:-
a) High side pressure relief valve.

b) Liquid line shut-off valve.
c) Filter-drier.
d) Moisture indicating sight glass.
e) Liquid line solenoid valve.
f) Thermostatic expansion valve.
g) Refrigerant liquid gauge or sight glass.
A106 STARTERS
1. Starters contained in weather-proof enclosure.
2. Starters completely wired to motors.
3. Star delta closed transition motor starters with thermal magnetic overload
protection for compressor.
4. Starter to be complete with upstream main disconnecting switch. (If this item is
not furnished with standard chiller, locally assembly weatherproof switch panel
shall be added to suit this requirement).
A107 CONTROLS
1. Each screw unit shall be factory equipped with a control device for cycling
compressor.
2. Flow switch shall be provided on supply water line.
3. Compressor shall start unloaded. Chiller shall be started sequentially to prevent
circuit overload.
4. Provide high motor temperature, high condensing pressure, low suction pressure,
low oil pressure and high bearing oil temperature cutouts, all factory wired to
independently stop compressor motor. Each of these cutouts shall have
individual pilot lights and manual reset.
5. Chilled water pump off-delay control; a timer with relays etc., to set the chilled
water pump running at least 10 minutes after the chiller shut down.
6. CONTROL PANEL:-
Each chiller shall be protected and controlled by a factory made micro-processor
control panel incorporating the following features:-
a) All automatic control gear for the refrigeration machine including capacity

control and lead-lag sequence control for unloading the chillers to 15%.
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b) All safety controls including:-
- Low oil pressure cut out.
- Low evaporator pressure cut out.
- Low chilled water temperature cut out.
- High condenser pressure cut out.
- High motor coil temperature cut out; and
- Overload relay.
- Low flow cut out.
- Phase failure under-voltage
- High oil or bearing temperature
All the above safety control shall have manual reset.
c) Pressure gauges to indicate evaporating pressure, condensing pressure and
oil pressure.
d) Indications for leaving water temperature, cooler pressure, condenser
pressure, system voltages, running currents, entering water temperature.
e) Alarm indication and log of low and high pressure, low oil pressure for each
compressor, overcurrent, high compressor motor winding temperature.
f) Set point indication for leaving water temperature, high/low pressure cut-out
etc.
g) One compressor running hours meter.
h) One ‘red’ light to indicate safety cut out operation.
i) One ‘green’ light to indicate ‘compressor ready to run’.
j) Panels for chiller diagnostic, remote chilled water set point signals and BMS
interface.
k) Spare contactors for chiller on-off control, on-off-trip status and malfunction
alarm for remote control and monitoring.
WORKMANSHIP

A201 INSTALLATION
1. Fit equipment and appurtenances to the space provided and make readily
serviceable. Pay attention to the equipment location and clearance to prevent
warm air recirculation.
2. Provide supporting-beams, secondary supports, platforms, hangers spring mount
vibration eliminator required for the proper installation of equipment.
3. Provide guy wire and eye hooks as required to brace equipment for a wind force
of 240 kilometres per hour.
4. Control panel shall be fitted with factory wired terminals for the remote
connection of all alarm functions, set point and start-stop switch.
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5. Arrange belt guards to permit the use of tachometer, oiling and testing with the
guards in place.
6. The unit shall be pressure tested, evacuated and fully charged with refrigerant and
an initial oil charge. An operational test shall be performed to check control
circuits and ensure that each electrical, pressure and thermostatic devices
operates correctly.
7. The unit shall be checked for any abnormal noise or panel vibration, fan rotation
and tip clearances and air pulsations and pure tone founds.
8. Electrical wiring and control circuit shall comply with the requirement of
Building Electrical Specification / Electrical Engineer. Should the factory
assembled wiring be not in compliance with this requirement, the Contractor
shall modify to suit at no extra cost to the Employer.
B. Air Cooled Split Air-conditioning Units
PRODUCT
B101 GENERAL
1. The units shall generally comply with ARI 210.
2. The units shall be designed for quiet operation with all moving parts mounted on
anti-vibration mountings and carefully balanced to ensure minimum vibration.

3. Each unit shall be of standard design and construction, having refrigerant of an
approved non-toxic, non-flammable type.
4. The indoor units shall consist of fans, cooling coils and associated pipework and
controls equipment. The outdoor air-cooled condensing units shall consists of
compressors, condenser coils and fans, associated pipework and control
equipment.
5. Each unit shall have single or multi compressors and each compressor shall have
its independent refrigerant and electrical circuit.
6. All units shall be selected with capacity based on 50Hz operation. All units shall
be designed for 380V, 3-phase or 220V, 1-phase ± 5%.
B102 CASING
1. Casing for indoor unit shall be constructed of welded steel plate 16 gauge or
heavier, die-formed, hot-dip galvanized. Except for the following;
a. wall mounted and cassette type, which shall have molded casing and be
of approved type by the Engineer; and
b. ceiling type indoor unit, the casing shall be finished with a high quality
baked enamel paint.
2. Condenser casing shall be constructed with heavy gauge sheet metal with zinc,
phosphate coating and baked enamel finish, weather raised for outdoor operation.
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3. Casing for housing coils and supply air fan shall be internally lined with moisture
proof, vermin-proof and hot-proof mat-faced 25mm thick fibreglass.
4. Casings for housing compressors shall be acoustically treated to achieve the
specified acoustic level.
5. Removal panels shall be provided for access to all internal components to
facilitate installation and maintenance.
B103 COMPRESSORS/CONTROLS
1. Compressors shall be hermetically sealed rotary type, refrigerant cooled for
operation with R22, R407c or R410a

2. Compressors shall be complete with all necessary accessories and controls for
safe and efficient operation and shall include:-
a) High refrigerant pressure (manually reset) safety cutout.
b) Low refrigerant pressure (automatically reset) safety cutout.
c) Compressor motor shall be protected by internal winding thermostats,
external overload relays and low oil pressure contacts.
d) Limit start timer for compressor.
e) The compressor shall be mounted on rubber isolated spring mountings.
B104 REFRIGERANT CIRCUIT
1. The contractor shall provide the following items for the refrigerant circuit:-
a) Thermostatic expansion valve, remote bulb and equalizer and direct
expansion coil.
b) Refrigerant filter for the expansion valve.
c) Dryer-filter.
d) Sight-glass and moisture indicators which shall be installed at inlet of dryer-
filter and expansion valve.
e) Liquid receiver with automatic release valve where necessary.
f) Service valves in liquid and hot gas lines.
B105 EVAPORATION COILS
Coils for evaporative blower unit shall be direct-expansion type operated with
thermal expansion valve for refrigerant control.
Coil shall be constructed of seamless copper tube complete with mechanically
bonded aluminium fins.
Heavy gauge insulated galvanized drip trays shall be provided under each evaporator
coil.
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B106 SUPPLY AIR FANS

1. Supply air fans shall be of low noise centrifugal type of corrosion resistant
construction. The fans shall be adequately rated to provide the air quantities
specified.
2. Supply air fans shall be full double width, double inlet, forward curved, multi-
blade fan statically and dynamically balanced. Fan wheels shall be mounted on
an adequately size shaft with 200,000 hours bearing.
3. Fans shall be direct drive type with field adjustable speed tap or driven by a vee
belt drive correctly aligned with pulleys capable for replacement as necessary to
achieve the air quantities specified.
4. The exact fan speed and fan motor size shall be determined having regard to the
resistance of all elements of the air conditioning systems to be provided and
installed, including ductwork and fittings.
5. Fan motors shall have permanently lubricated ball bearings and built-in thermal
overheat protection.
Degree of protection : IP55
Electric Insulation : Class B minimum
B107 AIR COOLED CONDENSERS
1. Air cooled condenser shall be constructed with copper tubes and aluminium fins.
Additional coil treatment is required to protect condenser coil with factory
applied air drying phenolic coating resistant to dilute acids, dilute alkalis,
solvents, inorganic salts and salt laden air. Fans shall be of propeller type. Fans
shall be dynamically and statically balanced at factory. Fan motors shall have
built-in thermal overheat protection.
2. Each compressor shall be connected to its independent condenser coil amply sized
to dispose the heat rejection. Total heat rejection of the coil shall be based on
45°C ambient temperature.
3. Condensers shall be provided with spring loaded pressure relief valve and line
valves.
4. Condensers shall be designed for suitable refrigerant working pressure.
B108 AIR FILTER AND CONTROLS

1. All units shall be complete with washable aluminium filters and thermostats
controls.
Filter efficiency shall be 85% minimum in accordance with BS 2831.
B109 REFRIGERANT PIPING
1. The contractor shall supply and install the complete refrigerant pipes with
replaceable core filter drier, moisture indicating sight glass, thermostatic
expansion valves and refrigerant shut-off valves.
2. Refrigerant pipes shall be copper for pressure system to BS 1306, Table 3.
3. The liquid line and gas line shall be insulated with 19mm Armaflex or equivalent
with ‘Class 0” fire hazard property.
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4. The refrigerant piping shall be adequately sized by the contractor according to the
recommendation of the manufacturer for refrigerant and oil conveyed through
the circuit.
5. Refrigerant pipes shall be enclosed in metal trunking whenever exposing to
sunlight.
B110 CONDENSATE COLLECTION SYSTEM
1. The contractor shall provide a condensate collection system comprising drain pass
and insulated uPVC down-pipes for handling the condensate collected from the
indoor units.
2. The condensate pipe shall be provided with sufficient cleaning plugs to ensure
that each portion of the pipework can be effectively cleaned in case of blockage.
3. Drain pan shall extend under the complete coil section.
4. Drain pan shall be constructed from 18 gauge hot-dip galvanized steel and:-
a) Drain pan shall be insulated with 25mm (minimum) thick fibreglass
insulation faced with additional aluminum foil vapour barrier;
b) Drain pan shall be coated with corrosion-resistant elastomeric base material
on both internal and external pan surfaces and points;
c) Drain pan shall have brazed water-tight joints; and

d) Drain coupling shall be brazed onto the drain pan.
5. The drain pan shall incline towards the drain coupling.
6. The drain pipe shall be of minimum diameter 25mm and connected to the nearest
suitable floor drainage system.
7. The drain pipe shall be of uPVC to BS 4514.
8. Drain pipe shall be insulated by flexible closed cell elastomeric insulation.
B111 ELECTRONIC CONTROLS
1. Controls shall be factory wired. Field wiring shall be limited to interconnections
between separate pieces of equipment and power wiring.
2. A wireless remote controller shall be provided.
3. Computerized control of temperature, humidity, self-diagnosis, detection of
thermistor abnormality and timer OFF/ON shall be provided.
4. Auto-fan speed control to suit the thermostats setting and room temperature shall
be provided.
5. A manual changeover selector switch shall be provided for selecting either
ventilation or air conditioning.
6. A thermostat shall have temperate settings between 10°C and 28°C.
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7. Interlocks for condenser and evaporator units with compressor circuit shall be
provided.
8. Automatic restart on power failure shall be provided.
WORKMANSHIP
B201 INSTALLATION
1. The outdoor condensing units and indoor units shall be mounted on spring
isolators with 20mm static deflection.
2. The Contractor shall fit equipment and appurtenances into the space provided and
ensure that the equipment is readily serviceable.
3. The Contractor shall provide all support beams, legs, hangers, anchor bolts,
vibration isolators, ductworks, and silencers for the proper installation of the

units as recommended by the manufacturer and shown on the drawings.
4. The Contractor shall provide wire guards for belts, pulleys, chains, gears and
other rotating parts.
5. The Contractor shall supply all condensing unit holding down bolts for setting
into the plinth. Future cutting and drilling into the plinth shall be avoided.
6. After completion of leakage tests on piping and accessories, the Contractor shall
charge the system with refrigerant in accordance with the manufacture’s
published data.
7. A weatherproof emergency stop switch shall be provided adjacent to the outdoor
unit.
C. Pumps and Cooling Towers
PRODUCT
C101 GENERAL REQUIREMENTS
1. The pump heads given in the Schedules are for guidance during tendering only,
and the sub-contractor shall be responsible for checking the total final resistance
of each system, based on the actual pipe runs and equipment offered, prior to
ordering. The calculation shall be submitted to the Project Manger for approval.
Any modifications to the system or any of its components, i.e. pumps, pipework,
motors, cable switchgear etc. which may be required to meet the scheduled
duties and space limitations shall be carried out at the Contractor’s expense,
excepting where modification is brought about by the written instruction of the
Project Manger.
2. The pumps selected shall have a characteristics suitable for the combined parallel
operation but selected to permit single pump operation. Curves indicating
excessive shut-off head shall not be approved.
3. Pumps impellers shall be sized at 80% to 85% of casing diameter so that impeller
size may be upgraded where necessary to accommodate any unforseen or
unexpected increase in pump head or flow.
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4. All pump shall be fitted with an air cock drain plug and calibrated pressure
gauges of suitable range on both suction and discharge side.
5. Pumps shall be constructed with materials suitable for use with the temperature
and chemical properties of the liquid to be handled.
6. All pumps shall be constructed to meet the required working conditions and
pressure of the system concerned. The casing, flanges, shaft packing or seal
shall be able to withstand full static pressure plus the dynamic head generated by
the pump when the discharge valve closed (zero flow condition).
7. The pumps shall be factory tested hydraulically to withstand 1½ times specified
working pressure but in no case less than 1000 kPa.
8. Unless otherwise specified, pumps shall be selected for use with speed not
exceeding 1,500 rpm
C102 CHILLED WATER / CONDENSING WATER PUMPS
1. Pumps shall be horizontal split casing or end suction centrifugal type as specified
with TEFC motor.
Horizontal split casing pumps shall be of the double suction, double volute,
centrifugal type.
End suction pumps shall be of single inlet centrifugal type, of back pull out
design with spacer type coupling, enabling the removal of the entire rotating
assembly without disturbing the pipe installation or driving motor or mountings.
2. The casing and covers shall be of close grained cast grey iron to BS1452 grade
180.
3. Impeller shall be bronze, statically, dynamically and hydraulically balanced, non
overloading and correctly designed for all conditions of service.
4. Shaft shall be of 316 stainless steel.
5. Bearings shall be self-aligning, radial trust type, oil lubricated designed for not
less than 100,000 hours of rated life. Bearing housing with overflow holes to
prevent flooding of bearings.
6. Shaft seals shall be balanced mechanical type, specially designed for pump
pressures as per schedule.

7. Drive motor shall be of drip-proof total enclosed fan cooled type (I.P. 44) with
15% margin on output over the requirement of the pump.
8. Pump characteristic curve shall rise continuously from maximum capacity to
shut-off. Shut-off head approximately 15% greater than design head. Pumps
operates at or near point of peak efficiency and permitting operation at capacities
of approximately 25% beyond design capacity without exceeding breakoff point.
9. Pumps shall be selected for use with speed not exceeding 1500 rpm unless
otherwise specified. All pumps and motors offered are to be of minimum
vibration and noise level during operation.
10.The following fittings shall be required for the pump installed:-
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a) Manual air valve, drain plug tappings with plugs and pressure gauge cocks at
suction and discharge flange shall be provided for each pump.
b) Eccentric tapered reducer at suction if necessary.
C103 COOLING TOWERS
1. Cooling towers shall be of the type with induced or forced draught fans as
indicated. The entering and leaving water temperatures and the water flow rate
shall be suitable for peak heat rejection rate at the maximum ambient wet bulb
temperature .
2. Casings shall be of glass reinforced plastics (GRP), or as indicated. The casing
shall have a treatment to minimize corrosion or decay and suitable for the casing
material used. The casing and structure shall withstand extreme typhoon gale
force winds from any direction.
3. The water distribution system shall be easily cleanable to minimize collection of
deposits and growth of algae which might encourage the growth of “legionella
preumophila” bacteria, and also be protected by a strainer. Open distribution pans
or troughs shall be fitted with coarse mesh grids to exclude debris.
4. Fill shall be of the film-type, vacu-formed PVC, with louvres and drift eliminators
formed as part of the fill sheets. Fill sheets shall be individually suspended from

stainless steel structural tubing, or by other suitable methods, supported by the
tower columns and intermediate stainless steel panels, and shall be elevated above
the floor of the cold water basin to facilitate cleaning. Air inlet faces of the tower
shall be free of water splash-out, and guaranteed drift losses shall not exceed
0.005% of the design water flow. All packing shall be resistant to corrosive
attack by algae, fungal growth, the type of condenser water used or the chemicals
used to treat the condenser water.
5. Where the tower is to circulate treated wastewater effluents or brackish well
water, all components must be capable of withstanding the corrosive effects of
these liquids. All metal parts shall be of zinc free bronze or suitable grads of
stainless steel coated after installation by heavy bituminous or suitable epoxy
resin coatings. Measures shall also be taken against insect and fungus attack.
The packing material shall not distort in any manner which would obstruct the air
or water flow.
6. The cooling tower ‘basin’ shall be provided in reinforced concrete to a specified
standard by the Building Contractor. Alternatively, if specified to be provided in
the Specialist Services Contract, it shall be of suitable stainless steel, GRP or as
otherwise indicated. Sheet mild steel basins if specified (for fresh water
applications only) shall be hot dipped galvanized after manufacture and have two
coats of an approved anti-corrosion paint applied.
7. The GRP hot water distribution basin shall be equipped with metering orifice-type
nozzles to deliver incoming water by gravity to the fill. Nozzles shall be easily
removable and replaceable.
8. The GRP cold water basin shall be sealed watertight, and shall include a float-
operated mechanical make-up valve, a 100 mm diameter overflow connection and
a depressed GRP sump complete with a debris screen made of stainless steel or
other suitable corrosion resistant material. The assembly shall be hot-dip
galvanized after fabrication and painted.
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9. The capacity of the basin shall be sufficient to prevent overflow when the tower is
at rest. There shall be adequate and easy access for cleaning out the basin.
10. Fans shall be of the axial type mounted to provide a vertical upwards air
discharge. In circumstances where centrifugal units are required, these will be
fully specified.
Particular attention must be given to the limitations on permitted noise levels,
where indicated. However, where not indicated, noise levels must be restricted
and must be stated with the plant offered. Plant likely to generate unacceptable
noise will not be accepted.
Fan casings and impellers shall either be made of corrosion resistant material or
proofed against corrosion after manufacture. Fan motors shall be totally enclosed
and weatherproofed. Fan motors on induced draught units shall have suitable
protective treatment as they will be mounted in the moist air stream.
Belt or gear drives shall be readily accessible but fully protected against the
weather and personnel. Anti-vibration ‘cut-out’ devices shall be provided to
protect the fans drive etc. Warning of a ‘cut-out’ shall be wired back to the plant
room in order to draw attention to any such problem.
11. A bleed pipe with stop valve and flow regulating device shall be provided on each
cooling tower.
12. Where indicated, chemical treatment equipment for maintenance of cooling water
quality shall be provided .
WORKMANSHIP
C201 INSTALLATION
1. Fit pumps and appurtenances to the space provided and make readily serviceable.
2. Horizontal pump shall be mounted on a common mild steel frame with a direct
coupled drip-proof squirrel cage motor.
The motor drive shaft shall be completely protected by a mesh safety screen.
Pump bases shall be machine finished, accurately aligned and bolted onto heavy
concrete plinth with anti-vibration mounting. Inertia block shall be required as
indicated on the drawings or specified elsewhere in the specification. The

alignment must be done to the satisfaction of the Project Manger and reports
shall be submitted for endorsement and record.
3. Align pump and motor at time of start-up, using dial indicator with accuracy of
plus or minus 0.05mm.This Contractor shall certify in writing that alignment
work has been performed by his personnel and that pumps are operating in
accordance with design requirement, if requested by the Project Manger.
4. The pump shall sit on at least 20m ribbed rubber pads.
Machinery cork and ribbed rubber pads on R.C. plinth shall be supplied and
installed by this Contractor with bituminous caulking.
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5. Pump fittings
Pressure gauges shall be 100mm diameter calibrated to suit the system pressure.
They shall be of the bourdon tube type with brass syphons and cocks with piping
connections to the measuring points. Gauges shall have black pointers, red
overrun indicators, and red mark at normal working pressure. Gauges must be
calibrated in kilo pascals.
6. Chilled water pump insulation
Chilled water pumps shall be insulated with 65mm thick fibreglass and sheathed
with 0.6mm removable shaped hammered aluminium casing. A canvas inertion
shall be provided to allow the insulated boxes to be removed without damaged
done to the insulation. Sheathing shall be in two halves clipped together for easy
removal. The insulation material and specification shall be as described for
pipework.
Condensate water drip tray under pump flange shall be provided.
7. Flexible connections
a) The Contractor shall provide flexible pipe connections at the pump suction
and discharge sides for each of the pumps. The flexible connections shall
have flanged ends, complete with tie-rods and must be suitable for 1.5 times
the working conditions and test pressure of the pumped system.

b) Flexible connections shall be as specified in the pipework section of this
specification.
c) Pipework shall be adequately supported on both sides of the flexible
connection to eliminate all lateral forces on the joint except those due to
vibration only.
d) Any such supports on the pump side of the joint shall be mounted so as not
to transmit vibration to the building.
8. Guards
All exposed shafts, couplings and moving parts of pumps shall be provided with
suitable galvanized angle iron wire mesh guards which shall be stoutly
constructed, easily removable, and provided with lifting handles. Care shall be
taken that these guards shall not cause ‘ring’ and/or create vibration noise.
9. Drainage
Provision shall be made for collecting gland leakage via a uPVC drain pipe fitted
from the pumps to the nearest gulley or drain point. A tundish shall be used to
collect the drips at the gland packing.
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D. Fan Coil Units, Air Handling Units and Ventilation Equipment
PRODUCT
D101 GENERALLY
1. The fan static pressure given in the schedules are for guidance during tendering
only, and the sub-contractor shall be responsible for checking the total pressure
loss of each system, based on the actual duct run and equipment offered, prior to
ordering. The calculation shall be submitted to the Project Manger for approval.
2. Fans shall be performance tested to BS 848:Part 1 and BS 848: Part 2 and quality
assured to BS 5750:Part 1.
3. All water coils shall be factory leak test at 2400 kpa air pressure under water in
accordance with ARI standard.
4. All fans shall be tested in accordance with ARI standard.

5. All factory applied thermal insulation, including facing and adhesive shall be fire-
resistant and conform to requirements of NFPA and local codes.
6. Where corrosion may occur, appropriate corrosion resistant materials and
assembly methods shall be used, including isolation of dissimilar metals against
galvanic interaction.
7. Where in contact with the air stream, protect insulation against corrosion of
flaking by a factory applied resin matt facing.
8. Locate and arrange motors, belts, filters, heating batteries, coils and other
components and accessories so that they are accessible for repair, maintenance
and replacement.
9. Mount grease fittings directly to bearings unless the latter are not readily
accessible. Where equipment bearings are not visible or are inaccessible,
provide easy extensions to bearing lubrication fittings.
10.Thoroughly clean the entire system before installing filters or operating the fans.
11.On systems containing filters, install filters and permanently seal the filter frame
air-tight before operating the fans. Replace all dirty filters and filter media
before handing the systems over to the Project Manger.
D102 FAN COIL UNITS
1. General
a) Units shall be provided with capacity at design conditions as indicated on
Equipment Schedule.
b) Units shall be wholly imported and factory assembled.
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c) Duty of the Unit shall satisfy both the latent and sensible cooling loads.
d) Units shall be selected with rated capacity taking into loss due to external
static pressure from connecting ductwork, filters, grilles, VAV boxes,
heaters, etc. The Contractor shall allow for extra air resistance imposed on
the air flow due to duct transformations and special grilles.
e) The Contractor shall taken into the consideration of the physical size of fan

coil unit upon the selection of equipment to suit the limited available space
between the structural beam for accommodating the fan coil units.
f) Chilled water flow rate through coil shall not exceed the manufacturer’s
recommended maximum flow rate and shall be matched with the design
conditions as indicated on Equipment Schedule.
2. Fan coil unit (FCU) :
a) FCU shall be of horizontal furred in unit with 1.2 mm galvanized casing and
without decorative cabinet unless otherwise specified. It shall be blow-
through type.
b) The unit shall generally comprise of centrifugal fan, cooling coil, filters,
cabinet and return air plenum with insulation, drain pan, motor drive and
accessories unless otherwise specified to be excluded.
c) In selecting FUC, the sub-contractor shall allow for the actual resistance
imposed on the ductwork due to air ducts, diffusers and other fittings.
This added resistance is to be applied to all fan coil units whether such
ductworks are shown on the drawings or not, and is to be taken as a
minimum of 50 pa external to the unit.
d) High static type fan coil unit shall be provided wherever air is distributed via
long duct work.
3. Cabinet :
a) Fabricated of 1.2mm galvanized steel, reinforced and welded.
b) Inside surface shall be zinc-coated and given a heavy coating of mastic.
c) All surfaces of the casing shall be cleansed free from dirt and greased and be
painted one coat of priming paint which shall be of genuine red oxide, and
two approved undercoats and finished with an approved high gloss paint.
d) Casing shall be acoustically and thermally insulated with 3mm resin coated
high density glass-fibre board or blanket meeting N.F.P.A. 90 requirements.
For pre-treated fresh air units the insulation shall be not less than 25mm
thick to meet humid and hot environment. Should condensation appear, the
contractor shall insulate the outside casing with extra insulation of approved

type without extra cost to the Employer.
e) The casing/plenum shall have sufficient access panel for filter, coil, fan etc.
for inspection.
4. Cooling Coil :
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a) Seamless copper tubes with copper fins mechanically bonded to the tube
with manual air vent shall be provided. Headers shall be seamless copper
tubes with supply and return connections, drain, vent on each header.
b) All coils are leak tested at 2400 kPa minimum air pressure and are suitable
for working pressure of minimum 1000 kPa and up to 150°C.
c) At the supply and return connections, isolating/control valves are to be fitted
as shown on the drawings. Union joints are to be fitted to connect the coil
so that the unit can be disconnected conveniently.
d) Coil casing including the structural member shall be flanged with reinforced
heavy galvanized steel and mounting holes and insulated with 50mm thick
glass fibre and vinyl coated.
e) Water velocity shall be minimum 0.6 m/s and maximum 1.8 m/s throughout
the tube length.
f) Coil shall be self-drain type with interdrain headers.
g) The face velocity of air through cooling coil shall not be greater than 2.5m/s.
h) The cooling capacity, maximum fin spacing, no. of rows, and other
conditions shall be as indicated in Equipment Schedule.
i) Coils shall be designed for operation at 1724 kPa working pressure and up to
150°C.
5. Drain Pan
The drain pan shall be situated beneath the cooling coil/header and arranged so
that all moisture will collect in the pan. Drain pans shall have copper male
connectors for connection to the condensate drain. The pan to be constructed
from galvanized steel with a coating of bituminous compound and to be properly

insulated with a minimum of 25mm of approved type insulation.
6. Fans and Motor
a) The fans shall be of the DIDW, forward curved centrifugal type.
b) Fans shall be constructed with aluminium blades mounted to a solid steel
shaft and shall be direct driven.
c) Motor shall be of ‘split-capacitor’ type with overload protection, suitable for
220V single-phase, 50Hz power supply.
d) The motor shall be resiliently mounted to the fan tray or scrolls and the
motor/fan tray assembly itself shall be also resiliently mounted to the casing
structure.
7. Filter
Cleanable type non-combustible aluminium/stainless steel air filter of 25mm
thickness shall be provided for fan-coil units where return air louvres cabinet
type or pre-treated fresh air unit are installed. Factory built filter/filter section
not complying this requirement shall be replaced locally.
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