PSD-QS (02/16)
Page 50
C. System blows
fuses or trips
circuit breaker
(con’t)
4. Excessively high or low supply
voltage or phase loss (3
only).
4. Note voltage range limitations specific
to the compressor.
5. Faulty run capacitor or soft start
components.
5. Replace as necessary.
D. Air handler fan will
not run.
1. Thermostat defective.
1. Check for 24V power on eight-post
terminal strip
between “C” and “G”.
2. Defective fan relay in air handler.
2. Check relay operation and continuity of
terminals.
3. Faulty motor/capacitor.
3. Refer to ECM troubleshooting.
E. System will not
switch to cooling
mode (continues
to run in heating
mode).
1. Thermostat faulty.
1. Check operation of thermostat and
replace if necessary.
2. Open heat/cool circuit (orange
wire).
2. Check for 24V on eight-post terminal
strip between “O” and “C”.
3. Four-way valve solenoid not
energized.
3. Check for magnetism at end of valve
coil.
Check for 240V at coil. Check Heat/Cool
Relay.
4. Four-way valve stuck in heat
mode.
4. Contact ETI Technical Support at 863-
701-0096.
F. Compressor turns
off on thermal
overload.
(check until
compressor’s
temperature
reaches room
temperature
before
determining the
internal overload
is defective)
1. Refrigerant leak.
1. Check for refrigerant level in ACC.
Repair leak, evacuate system and
recharge with refrigerant.
2. System undercharged.
2. Charge system.
3. Four-way valve is short circuiting
refrigerant and bypassing hot gas
to suction.
3. Replace four-way valve, evacuate,
recharge and start-up system.
4. Compressor valves are faulty/
bypassing.
4.
Use Rubber Mallet on Scroll Comp’s.
before condemning. Replace
compressor and evacuate, recharge
and start-up system
.
5. Compressor contactor dirty or
pitted. (> .5 Ohms Resistance
across Contact points)
5. Replace as necessary.
6. Faulty run capacitor or start
components.
6. Replace as necessary.
7. Compressor with locked rotor.
7. Replace as necessary.
G. Uncomfortable
temperature.
(Not enough
heat/cold air)
1. Thermostat fault.
1. Adjust thermostat settings / Replace
thermostat.
2. Defective heating element(s).
(Heating mode).
2. Check resistance element(s) for
continuity.(Heating mode only)
3. Defective heater relay.
(Heating mode).
3. Check relay for proper operation.
Replace if defective. (Heating mode
only)
4. Thermal limit is open. (heat kit)
4. Check continuity across thermal limit
switch. (Heating mode only)
5. Compressor fault.
5. To reset switch, turn primary power off
then back on; turn thermostat system
switch to OFF, then back on.
6. Outdoor thermostat not connected
or failed (heating mode).
6. Check outdoor thermostat and electric
supplemental heat operation. Confirm
proper wiring. (Heating mode only)
Figure 36. System
Troubleshooting Chart (con’t)
Summary of Contents for Prime-025
Page 15: ...PSD QS 02 16 Page 15 Figure 8 PSD Compressor Unit Electrical Schematic 230 1 60...
Page 16: ...PSD QS 02 16 Page 16 Figure 9 PSD Compressor Unit Electrical Schematic 230 3 60...
Page 17: ...PSD QS 02 16 Page 17 Figure 10 PSD Air Heating Cooling Water Heating Application...
Page 18: ...PSD QS 02 16 Page 18 Figure 11 PSD Air Heating CoolingWater Heating Field Wiring Diagram...
Page 20: ...PSD QS 02 16 Page 20 Figure 11a SureStart Mode of Operation...
Page 27: ...PSD QS 02 16 Page 27 Figure 15 Disassembled Plug Connector...
Page 34: ...PSD QS 02 16 Page 34 Figure 24 PSD Internal Flow Schematic...
Page 35: ...PSD QS 02 16 Page 35 Figure 25 PSD Piping...
Page 37: ...PSD QS 02 16 Page 37 Figure 26 Evacuation of PSD System...
Page 39: ...PSD QS 02 16 Page 39 Figure 27 Initial Charge of PSD System...
Page 41: ...PSD QS 02 16 Page 41 Figure 28 Final Charge of PSD System...
Page 44: ...PSD QS 02 16 Page 44 Figure 32 Start Up Process...
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Page 55: ...PSD QS 02 16 Page 55...
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