Aircel DHT-100, Installation And Operation Manual

Page: 14 / 36

14
has been completed, the compressed air outlet
valve on the high inlet temperature refrigerated
air dryer system can now be slowly opened to
supply clean dry compressed air to the facility.
10. After start-up and approximately one month
of service, check that all piping and fittings are
tight and free of leaks.
Notices:
• Models with the hot gas by-pass valves and
expansion valves are preset at the factory
for the desired dew point. Do not adjust
without consulting with the factory.
• The dryers are fully automatic and do not
require any auxiliary controls.
Automatic Drain Valve Adjustments
The automatic drain valve supplied is standard
on the separator and should open regularly and
discharge any accumulated water into the drain
line. The period between openings varies with the
dryer and operating conditions (electronic type). To
minimize air losses, the timer should be adjusted
to open the drain solenoid just long enough to
discharge the accumulated condensate. Set the
timer so that only air discharges at the end of the
open period. Recommended initial settings are (7)
seconds drain opening (on time) and a (7) minute
close time (off time). If air discharges far more than
(2) seconds from the separator discharge, set the
timer for a longer cycle time. If liquid discharges as
the solenoid is closing, set the timer for a shorter
cycle or a longer open time.
Operating Procedure
After the initial startup, the dryer operation is
completely automatic. To understand the details of
the operation, use the flow diagram on pages 7-8
and the timing sequence of the dryer.
Air Cooled Condenser Requirements
Cooling air must be drawn from a clean source to
reduce dust and dirt accumulation on the condenser
coils. Air temperature should not exceed 100°F
(38°C).
Model by
SCFM Rating
Refrigeration
Hp
Cooling air
flow (cfm)
20 1/3 350
40 1/2 500
50 1/2 500
75 3/4 900
100 3/4 900
125 1 1125
Aircel DHT Series - Models 20 - 125