precooling.
b.
Main heat exchanger: ASTM A 269, Type 304L seamless stainless
steel tube construction, single-pass, designed for minimum air
pressure drop with air in the tubes surrounded by aluminum
granules.
c.
Separator: Fabricated of ASTM A 269, Type 304L seamless stainless
steel in accordance with ASME B31.1. Code stamp is not required.
Provide moisture separator, low velocity type, incorporating
change of air flow direction to prevent moisture carryover.
d.
Dryer operating pressure: [20,682] [34,470] [_____] kPa (gage)
[3,000] [5,000], [_____] psig working pressure.
e.
Drain line: Provide drain line to exterior of dryer with
[condensate trap] [or] [automatic drain valve].
f.
Exterior piping connections:
Provide with square ends.
2.2.3
Refrigeration System
Include the following:
a.
Compressor: ARI 520. Hermetic reciprocating compressor equipped
with automatic start-stop control, inherent motor protection,
crankcase oil strainer, and suction screen. Refrigerant shall be
R-22.
b.
Dryer controls: Capable of automatic 0 to 100 percent capacity
control with an automatic control expansion valve with sensing
bulb to control capacity, with automatic shutdown switch sensor
located at point of lowest temperature to prevent freezing.
c.
Air cooled condenser.
2.2.4
Instrumentation and Controls
Provide control panel in dryer cabinet containing:
a.
Indicators:
(1)
Inlet air pressure gage
(2)
Discharge air pressure gage
(3)
Inlet air temperature gage
(4)
Main exchanger temperature gage
(5)
Refrigeration compressor suction pressure gage
(6)
Refrigeration compressor discharge pressure gage
(7)
Power interruption light
(8)
High temperature light
(9)
Power on light
SECTION 15212N
Page 19
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