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

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:-

- 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%.

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

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.

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.

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

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

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

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

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.

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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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.

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

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