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7. System low on
refrigerant.
Checkrefrigerant“sightglass”in1/4”tubing.
Check for bubbles after system has run for several
minutes. If bubbles present, call a CERTIFIED HVAC
service technician. If sight is clear of bubbles,
refrigerant level is OK.
8. Thermostatic
expansion valve power
element losing its
charge.
System will operate as if it were low on refrigerant
charge. Sight glass will be clear. Evaporator coil icing
probable.
Call a CERTIFIED HVAC service technician.
9. Low voltage to
compressor, below
103V with compressor
running.
Low voltage will cause compressor overheating and
tripping on overload. Also, can have difficulty starting.
This is usually a field wiring problem which should be
corrected immediately.
10. Cooling system not
sufficient for load
If system is determined to run OK but not keeping up,
run a heat gain calculation for the wine cellar and
compare with cooling system capacity.
Evaporator blower runs, but compressor does not
1. System “Anti-Frost“ Observe for several minutes. Compressor should turn on
at termination of “Anti Frost“ Cycle and evaporator clear
of frost.
2. Power off to
compressor.
Checkbreaker/Referto#3above
3. Out of refrigerant. Call a CERTIFIED HVAC service technician to locate leak,
repair and charge with refrigerant
4. Compressor off on
overload.
Determine if compressor is hot. If not, there is another
problem. If yes, shut off power to condensing unit and
call service technician
5. Liquid line solenoid
valve in evaporator not
active.
Remove cover. Locate valve in ¼” copper tube. Check
to see if it is hot. If hot and you can feel a magnetic pull
with a screwdriver, the valve is working. If cold, there is
no power to the valve coil. In this event, with the blower
running, the valve should be powered. Call a CERTIFIED
HVAC service technician.
6. Thermostat
expansion valve power
element lost charge
System will “pump down.” Compressor will stop.
May start occasionally and shut off quickly.
Call a CERTIFIED HVAC service technician.
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