Paper Supplies Store AT Berkat AL Awamer: Qatar International Islamic Bank (QIIB)
Paper Supplies Store AT Berkat AL Awamer: Qatar International Islamic Bank (QIIB)
Paper Supplies Store AT Berkat AL Awamer: Qatar International Islamic Bank (QIIB)
SECTION 23 74 00
1. The air-cooled packaged Air Conditioning Units shall be factory assembled complete
with piping and wiring and shipped with refrigerant charge and oil change.
2. The only required field connections shall be the system ductwork, electrical power
supply and external control cables when required.
5. Packaged units shall be provided with N+1 arrangement and included duty and
standby and duty sharing. Each PACU shall be provided with manufacturers control
panel with provision for interface with FAP, DCS and SCADA system where
applicable.
6. PACUs shall be provided with a factory applied protective coating to protect against
corrosion.
8. The units shall be provided with lifting lugs for easy site handling.
10. The Packaged Air Conditioning Units controls and starters shall be housed in a
weather proof and dust proof enclosure with lockable door. The minimum rating for
the enclosure shall be IP55.
11. Casing: Evaporator section shall be sealed with vinyl gaskets & completely
insulated faced with black glass tissue (BGT) heavy density, fire retardant,
permanent odorless fiberglass insulation of minimum 25 mm thickness & 32 kg/m3
density having maximum k factor 0.033 W / m °k. Unit casing shall be provided with
access panels for easy service & maintenance of all unit parts.
13. Evaporator Coil: Direct-expansion coil with seamless copper tubes expanded into
aluminum fins.
14. Condenser Coil: Seamless Copper tubes tested at 3000 kpa in accordance to UL
1995. Epoxy-phenolic coating for corrosion protection. The coating shall be
warranted for 5 years.
15. Condenser fan: Propeller type with aluminum alloy blades and directly driven by
electric motor. The fan shall be statically & dynamically balanced.
16. Filters: ASHRAE 52.2 compliant 25-mm thick, cleanable panel pre-filters & 750 mm
deep bag filter.
17. Refrigeration System: Factory assembled and tested, and charged with R-407C
refrigerant; consisting of piping and accessories connecting compressor, evaporator oil,
and condenser coil, and including the following: Retain first subparagraph below if
required for heat-pump units only.
a. Expansion valve with replaceable thermostatic element.
b. Refrigerant dryer.
c. High-pressure switch.
d. Low-pressure switch.
e. Thermostat for coil freeze-up protection during low-ambient temperature
operation or loss of air.
f. Low-ambient switch.
g. Brass service valves installed in discharge and liquid lines.
18. Control Package: Factory wired, including contactor, high- and low-pressure
cutouts, internal-winding thermostat for compressor, control-circuit transformer, and non-
cycling reset relay.
a. Supply fan.
b. Compressor.
21. The packaged Air Conditioning Units shall be supplied with Auto changeover
panels to be operated in Duty/standby arrangement.
22. The system shall be designed and supplied with the refrigerant as specified in the
Project Documentation.
23. The power supply cables and protective devices shall be rated as recommended by
the manufacturer.
24. The Packaged Air Conditioning Units shall be selected to meet the capacities as
detailed in the Project Documentation.
26. The Packaged Air Conditioning Units shall be in accordance with the latest QGEWC
regulations.
28. Adequate space shall be provided for operating and maintenance purpose.
2.4 COMPRESSORS
2.4.1 General
1 Compressors shall be tested and rated in accordance with ISO Standard 917 or
equivalent and guaranteed to operate at published capacities.