2.7.4
Instrumentation and Control
Provide a control panel on the dryer containing:
a.
Pressure gages (114 mm4 1/2 inches diameter) for the following
services:
(1)
Inlet air
(2)
Condenser water inlet
(3)
Refrigeration compressor suction
(4)
Refrigeration compressor oil pressure
(5)
Outlet air
(6)
Condenser water outlet
(7)
Refrigeration compressor discharge
b.
Electrical relays: Locate in an enclosed portion of the panel,
accessible from front of panel.
c.
Start-stop buttons and green running indicating light.
d.
Controls and interlocks
(1)
115-volt control transformer
(2)
Circulating pump across the line contactor
(3)
Compressor across the line contactor
(4)
Condenser water pressure safety switch
(5)
Freeze protection safety switch
(6)
Pump-out relay with normally open and normally closed contacts
(7)
Oil safety switch
(8)
Four stage thermostatic control
(9)
Refrigerant dual pressure switch
2.7.5
Temperature Indicators
a.
Air inlet
b.
Air outlet
c.
Chilled water in
d.
Chilled water out
e.
Dew point
SECTION 15212N
Page 26
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