7
4. After 15 minutes, open outlet isolation valve slowly.
5. Close air bypass valve.
6. Dryer may be operated in Manual or Scheduled modes.
NOTE: ON MODELS 500, 600, and 750, CHECK FOR CORRECT
PHASING OF UNIT. After starting the dryer, if an unusual
noise is heard, or if the discharge line does not get hot, the
refrigeration compressor may be running in the reverse
direction. Immediately stop the dryer, reverse two of the
power leads, restart the dryer, and verify the unusual noise is
corrected and the refrigerant discharge line is hot. FAILURE
TO DO SO MAY DAMAGE THE COMPRESSOR AND VOID THE
WARRANTY.
Manual mode - push On/Off button - refrigeration
compressor will start and run, green Compressor-on
light will illuminate. In this mode compressor will run
continuously and will not be turned on and off by the
monitor. MANUAL OVERRIDE will appear on interface
panel.
Schedule mode - push Schedule On/Off and Enter button.
SCHEDULE RUNNING will appear on the interface panel.
The refrigeration compressor will continue to be on or
off (as selected in the Manual Override Mode) until the
next scheduled event. The compressor will then turn on
or off as programmed.
NOTE: Schedule may be returned to the manual mode at
any time using the ‘Schedule On/Off and Enter’ button.
MANUAL OVERRIDE will appear on interface panel. To
reinstitute Schedule, push the ‘Schedule On/Off and Enter’
button again.
NOTE: Restart after the power interruption. Unit will be
in MANUAL OVERRIDE mode, refrigeration compressor, off
when power is restored after power interruption.
7. To reinstitute SCHEDULE RUNNING, push ‘Schedule On/
Off and Enter’ button.
IMPORTANT: Dryer must be energized 24 hours before
refrigeration compressor is started.
E.
Operating check points
1. Check that green Power-on light is illuminated
2. Check that green Compressor-on light is illuminated if
dryer is on in the manual mode or it is a scheduled on
time
IMPORTANT: Refrigeration compressor must be restarted
after power interruption.
3. Check interface panel
NOTE: Interface panel will scroll through three screens
(Current Time/Operating Status, Hours to Service and Total
Operating Hours).
a. Verify that current time is correct
b. Check HRS TO SERVICE: this indicates time remaining
until service is required; allow time for required
maintenance items to be ordered
c. Check operating status:
MANUAL OVERRIDE - Dryer is either running
continuously (not being controlled by the scheduled
on/off times) or the refrigeration compressor has
been shut off using the ‘On/Off’ button.
SCHEDULE RUNNING - Refrigeration compressor
is being turned on and off by the monitor per-
programmed schedule (see B.3. to set schedule).
d. Check Temperature indicator - indicator should read
in the green area.
e. Check Alarm/Service light If illuminated, check
Interface panel.
1) If SERVICE DRYER appears, scheduled maintenance
time has elapsed (HRS TO SERVICE is 0). Perform
needed service and reset service interval (see B.3.).
2) If ALARM appears, a dryer fault is indicated; see
Troubleshooting Guide for possible remedies.
After fault correction push Reset button to turn
Fault alarm off.
Type of FAULTS:
LOW PRESSURE - the refrigeration compressor
control circuit has opened because of low suction
pressure.
HIGH PRESSURE - the refrigeration compressor
control circuit has opened because of high head
pressure. The high pressure switch must be reset
manually once the fault is corrected. Red reset
button is located on pressure switch inside unit.
HIGH TEMPERATURE - compressed air temperature
is above the set point.
COMPRESSOR - Normally open (NO) auxiliary
contact on the compressor contactor is open
when the dryer is on.
HEATER - Normally closed (NC) auxiliary contact
on the compressor contactor is open when the
dryer is off.
TEMP SENSOR - Occurs if the temperature sensor
circuit is open or shorted. If open, the left-most
LED in the temperature display will be illuminated.
If shorted, all the LEDs in the temperature display
will be illuminated.
DRAIN - electric drain contains a high water level
alarm that activates if drain fails to discharge.
f. Check drain operation - push Drain (push-to-
test) button to energize electric drain. A flow of
condensate and/or air should be present at the drain
outlet.
