26
|
TROUBLE SHOOTING
Verify that wire
connections from
controller are secure
NO
YES
YES
YES
NO
NO
NO
NO
NO
NO
Compressor won't start
Is controller calling for
compressor?
Do you have voltage at
compressor?
Check for open windings
Replace compressor
Are there any alarms on
the controller?
Refer to alarm chart in
manual
Replace run capacitor
Is cooling relay closing?
Is there voltage from
controller?
Replace overload
Replace relay
Check run capacitor for
correct capacitance.
Check overload to ensure
it is closed
Check cooling set point.
Compressor should start
when greater than
7
degrees of set temp.
YES
YES
YES
YES
NO
YES
YES
NO
NO
NO
NO
YES
YES
YES
NO
YES
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
NO
Unit Won't Turn on and/or Cool
Does the unit have
correct supply voltage?
(Correct voltage
displayed on nameplate)
Correct voltage and
retest or contact
certified electrician.
Is the controller
illuminated?
Is there correct supply
voltage to controller
(
24
V DC)?
Possible Causes:
•
24
V Transformer
• Rectifier
• Check Wiring
Replace
controller
Are there
any alarms
displayed
on the
controller?
Is compressor
running?
Refer to alarms
chart in controller
section of manual
Is enclosure temp
7
° above cooling
setpoint and
controller is calling
for cooling?
Possible Causes:
• Start Cap
• Open Motor
Winding
• Contactor
Are the
filter and
condenser
coil are
clean?
Condenser fan -
is the HPC Switch
closed? The HPC
switch closes at
165
°F and opens
at
95
°F.
Clean accordingly.
Contact Customer
Service for new
filter if needed.
Possible Causes:
• HPC
• Low Charge in
System
Are BOTH fans
running?
Possible low charge.
Verify pressures, contact
HVAC certified Technician.
Verify
voltage to
fans.
Replace fan and
re-test or contact
Technical Support
Evaporator
Fan-Possible
Causes:
• Evap fan
Capacitor
• Loose wires
Contact
Technical
Support
763
-
422
-
221
ext
1
,
2
,
3
Adjust settings;
See controller
section of manual.