WhisperKool SS7000 - Manual (Page 26)

Compressor runs, but evaporator does not
1. Faulty blower
motor or broken wire
connection Evaporator coil probably frozen •
Shut off power to condensing unit •
Call a CERTIFIED HVAC service technician for repair •
2. Defective low
pressure switch not
shutting compressor off
when pressure drops Compressor would continue to run when thermostat •
is satisfied and shuts blower and solenoid off. When
space warms up to set point, blower starts and the
system runs normally.
Prolonged running without refrigerant flow will
•
damage or destroy compressor. If this condition
exists, call a CERTIFIED HVAC service technician.
Compressor short cycles, which is different from running intermittently
1. System pressure
controls defective. Call a CERTIFIED HVAC service technician to verify and
repair.
2. System low on
refrigerant. Observe for flashing in refrigerant sight glass located
in 1/4” copper tube at condensing unit. If flashing with
bubbles, call a CERTIFIED HVAC service technician for
leak location, repair, and adding refrigerant.
3. Condenser fan motor
defective Fan does not run with compressor. •
¼” copper tube at sight glass – very hot, compressor •
very hot, runs short time, shuts off.
Shut power off to condensing unit
•
Call a CERTIFIED HVAC service technician for repair. •
4. Compressor starting
components defective. Compressor very hot and hums when trying to start. •
Shut power off to condensing unit. •
Call a CERTIFIED HVAC service technician. •
Evaporator coil freezes
1. Air filter, if
equipped, dirty Clean or replace filter
2. Evaporator coil and/
or blower dirty Clean coil and blower
3. Thermostat set point
too low. Set point should not be lower than 50°. If so, increase to
above 50°
4. System low on
refrigerant Check refrigerant “sight glass” in 1/4” tubing. Check
for bubbles after system has run for several minutes. If
bubbles present, call a CERTIFIED HVAC service technican.
If sight is clear of bubbles, refrigerant level is OK.
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