10
REFRIGERATED AIR DRYER INSTRUCTION MANUAL
Ultra Air Refrigerated Dryers
201 Series Instruction Manual
Air cooled models
Cooling air flows from the front to the back of the dryer. Air must be drawn from a clean source in order to
reduce dust and dirt accumulation on the condenser coils. Air temperature should not exceed 110ºF
(43ºC).
Fan motor rotation check (this check applies only to air cooled models)
Locate the rotation decals. These may be on each motor or on the condenser. Observe the refrigerant
compressor cooling fans. Rotation should be in accordance with the fan rotation shown on the decals.
Cooling air should exhaust through the condenser coils away from the fan motors.
WARNING
Disconnect electrical services from the unit whenever it is necessary to make
adjustments on timers or when servicing drain valves.
Initial Startup Procedures
The following procedure must be followed. Failure to do so could damage your dryer and invalidate the
warranty. Before starting...
1. Be sure dryer ‘on/off’ switch is in the ‘off’ position
and disconnect all power to dryer.
2. If refrigerant gauges read below 40 PSIG (2.75
bar), do not start the dryer. Contact your
Ultra Air distributor or the factory
directly.
3. Make sure the air inlet and outlet piping is piped
correctly and piping is supported correctly. Do
not use the dryer in and out connections as sup-
ports.
4. Make sure condensate lines are run properly
and to the correct locations.
5. Set drain ‘on’ and ‘off’ times. During periods of
high humidity it is recommended that ‘off’ time is
decreased and ‘on’ time is increased. During
periods of low humidity, increase ‘off’ time and
decrease ‘on’ time.
6. Check that there is adequate ventilation on all
air cooled units.
7. For water cooled units, make sure cooling water
is being supplied to the unit.
8. Confirm proper inlet air pressure, temperature,
and flow to the dryer.
9. Connect power to dryer. This will energize
crankcase heater(s). Allow the unit to stand for
24 hours before continuing (3 phase only).
10. Check lights. The ‘power on’ lights should be lit.
11. Pressurize the unit by opening an air inlet valve
with the bypass valve open and the air outlet
valve closed (3 valve bypass is option offered
by Ultra-Air).
12. Press the rocker switch to “on” position. The
‘dryer on’ light will illuminate and the
compressor will start. Shortly after startup, the
suction press gauge will read 56-62 PSIG on
R22 units or 28-32 PSIG for R134a units.
13. Open the optional air outlet valve to pass
through dryer and close the bypass valve.
Shutdown Procedures
1. Press the rocker button to the ‘off’ position.
2. 10-15 minutes after the unit shuts down, cooling water can be shut down (water cooled units only).
3. Turn off main disconnect if necessary.
