Greensource SM Split Heat Pump – CS Installation Manual (PDF 1.8 MB)

SM CS Series Heat

Troubleshooting | 21

Problem

INSUFFICIENT

COOLING OR

HEATING

Possible Cause

Unit undersized

Unit Troubleshooting

Checks and Correction

Recalculate heating and or cooling loads. If excessive, possibly adding insulation and shading will rectify the problem

Check for leaks in duct work or introduction of ambient air through doors or windows

Loss of conditioned air by leakage

Airflow Lack of adequate air flow or improper distribution of air. Replace dirty filter

Low on refrigerant charge causing inefficient operation Refrigerant charge

Compressor

Reversing Valve

Operating pressures

TXV

Moisture, noncondensables

Check for defective compressor. If discharge is too low and suction pressure is too high, compressor is not pumping properly. Replace compressor.

Defective reversing valve creating bypass of refrigerant from discharge of suction side of compressor. Replace reversing valve

Compare unit operation pressures to the pressure/temperature chart for the unit.

Check TXV for possible restriction or defect. Replace if necessary.

The refrigerant system may be contaminated with moisture or noncondensables. Reclaim refrigerant, replace filter dryer, evacuate the refrigerant system, and recharge with factory recommended charge.

Compressor Ohms

Model Start Winding Run Winding

SM024

SM036

SM048

SM060

1.64

1.52

1.86

1.63

1.3

0.88

0.52

0.39

SM070 1.85

0.34

Tolerance +/- 7%. All resistance values must be measured with compressor at room temperature.

UPM Board LED Indications

Indication

Color Blinks

GREEN

RED

RED

RED

RED

RED

RED

4

5

6

Solid

1

2

3

Description

18-30 VAC Power is present

High pressure lockout

Low pressure lockout

Freeze sensor lockout

Condensate overflow

Brownout

Evaporator Freeze condition

Revised 01-15 8 733 920 846 (2015/01)