Quantech QTC2015T Manual page 66

FORM QTC2-eg1 (515)
Guide Specifications (Cont'd)
2.03 REFRIGERANT CIRCUIT COMPONENTS
Each refrigerant circuit shall include liquid line shutoff valve with charging port, low side
pressure relief device, filter-drier, solenoid valve, sight glass with moisture indicator, ex-
pansion valves, and flexible, closed-cell foam insulated suction line. Unit also includes
service isolation valves as standard.
2.04 HEAT EXCHANGERS
A. Evaporator:
1. Evaporator shall be brazed-plate stainless steel construction, single or dual circuit
heat exchangers capable of refrigerant working pressure of 650 psig (3103 kPa)
and liquid side pressure of 150 psig (1034 kPa)
2. Evaporator shall be covered in 3/4" (19mm) flexible, closed cell insulation, thermal
conductivity of 0.26k (BTU/hr-fT2-°f]/in.) maximum.
3. Cooler shall have thermostatically controlled heaters to protect to -20°f (29°C) am-
bient in off-cycle.
4. Brazed plate heat exchangers shall be Ul listed.
5. installing contractor must include accommodations in the chilled water piping to
allow proper drainage and venting of the heat exchanger. A strainer with a mesh
size between 0.5 and 1.5mm (40 mesh) is recommended upstream of the heat ex-
changer to prevent clogging.
B. Air Cooled Condenser:
1. Coils: internally enhanced, seamless copper tubes, mechanically expanded into
aluminum alloy fins with full height collars. Subcooling coil an integral part of con-
denser. design working pressure shall be 650 PSiG (45 barg).
2. low Noise fans: Shall be dynamically and statically balanced, direct drive, propel-
ler type fan, providing vertical air discharge and low sound. Each fan in its own
compartment to prevent crossflow during fan cycling. Guards of heavy gauge, PVC
(polyvinyl chloride) coated or galvanized steel.
[OPTIONAL]: Ultra-Quiet fans
3. Fan Motors: High efficiency, direct drive, 6 pole, 3 phase, insulation class "F", cur-
rent protected, Totally Enclosed Air-over (TEAo), rigid mounted, with double sealed,
permanently lubricated, ball bearings.
2.05 CONTROLS
A. General: Automatic start, stop, operating, and protection sequences across the range
of scheduled conditions and transients.
B. microprocessor Enclosure: rain and dust tight NEmA 3r/12 powder painted steel cab-
inet with a gasket sealed protective cover.
66 QUANTECH