Pub. No. OM-A-75 REV. 4 — March 2006
9
To enter the SERVICE DUE mode (and view the
accumulated run time) press SELECT, UP (
↑
) and DOWN
(
↓
) keys simultaneously. The display will show the
accumulated run time in tens of hours. If the display reads
50, for example, the accumulated run time is 500 hours.
1.
To display the service due threshold, hit the DOWN
(
↓
) arrow key. The service due indicator will light.
2.
To test the service due timer function, push the
SELECT and UP (
↑
) keys simultaneously. The
accumulated run time will temporarily be set to a
value that is 60 seconds less than the service due
threshold setting. If the service due timer is
functioning properly, the SERVICE DUE indicator will
flash after the 60 seconds has elapsed. After a few
seconds, SERVICE DUE mode will return to normal
operation. The indicator will stop flashing and the
accumulated run time will return to its previous value.
3.
To reset the accumulated run time to zero, hold the
SELECT key for 5 seconds.
To exit SERVICE DUE mode, press the UP (
↑
) and DOWN
(
↓
) keys simultaneously. This can not be done while a
service due timer test is in progress.
SHUTDOWN PROCEDURE
1.
Open the bypass valve to allow process flow to
continue downstream. Then close the outlet isolation
valve on the dryer bypass piping.
2.
Close the inlet isolation valve on the dryer bypass
piping. At this time the dryer is isolated and can be
depressurized, ready for servicing.
3.
Turn the power switch to the OFF position.
NOTE:
The alarm indication light (red) signifies the
refrigerant compressor is not running. The reasons can be:
• Low suction pressure
• High discharge pressure
• Electrical problems
• Loss of refrigerant
• Dirty condenser
• Leaking evaporator, etc.
Refer to Troubleshooting Guide, Page 15, for problem
analysis and remedy. Call the factory if further assistance
is required.
OPERATING CONDITIONS
Entering Air Temperature
Units are designed for entering air temperature of 100°F.
If the temperature of entering air is to be greater than
100°F, the factory should be consulted to determine the
maximum possible air flow through the unit.
Entering Air Pressure
Standard units are designed for operating air pressure
100 PSIG (150 PSIG MAX.). Operating below 100 PSIG
will reduce system capacity.
Ambient Air Temperature
The allowable ambient temperature range is 40°F to
110°F. As temperatures approach freezing conditions,
frost or icing may develop in the unit. At temperatures
above 100°F, refrigeration capacity will decrease,
therefore affecting dew point.
Contact factory before authorizing any
warranty refrigeration service on the air
dryer. Identify the dryer by model and
serial numbers when calling factory.
The increased heat content or higher tem-
perature air requires the dryer to be over-
sized to prevent overloading of the
refrigerant compressor.
