Table of Contents
Advertisement
G. Uncomfortable
temperature.
(Not enough
heat/cold air)
(cont'd)
H. Poor Compressor
Performance
(Runs, but Not
pumping
Refrigerant)
SD-410-QS (H) (06/15)
7. Refrigerant undercharged.
8. Restriction in refrigerant circuit.
9. System is locked out on high or
low pressure.
10. Defective pressure control.
11. Reduced air flow.
12. Unit undersized/ oversized.
1. Reversing Valve stuck and
Compressor will not create a
pressure difference between high
and low side of the system.
2. Bad Compressor
Figure 42. System Troubleshooting Chart (con't)
7. Check for refrigerant level in
ACC.(Heating mode only)
Repair leak, evacuate and recharge the
system. Check In-line sight glass in
cooling mode.
8. Check for blockage or restriction,
especially in Liquid Flow Control.
Assure that modification of non-ETI air
handler is performed. Check valves,
filter/dryer and anti-migration valve.
9. Check low pressure and high pressure:
Check limit cut-off pressures. Control
is set to actuate at 5 (R-22 &
407C)/25psig (R-410A) (low pressure)
and 400 (R-22 & 407C)/600 psig (R-
410A) (high pressure) +10%. Check for
continuity on both switches under
normal pressure conditions. Refer to
Unit performance table.
10. Check limit cut-off pressures. Control
is set to actuate at 5 (R-22 &
407C)/25psig (R-410A) (low pressure)
and 400 (R-22 & 407C)/600 psig (R-
410A) (high pressure) +10%. Check for
continuity on both switches under
normal pressure conditions.
11. Check air ducts for leaks and repair.
Check blower operation. Check air
filter(s). Remove air flow restrictions
(min.400 CFM/ton).
12. Contact ETI Technical Support at 863-
701-0096.
1a. Pinch closed the Discharge Line to
verify the Compressor builds High
Pressure, if so, replace Reversing
Valve.
1b. If High pressure does not build after
pinching the Discharge Line closed, the
Compressor has failed, replace
Compressor.
2. Replace after verification of Amp Draw
below RLA and pinch closed the
Discharge Line between the
Compressor and the reversing Valve to
verify pressure does not build on the
high side.
Page 56
Advertisement
Table of Contents
