Bosch SM070 Specifications download pdf (Page 48)

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48 | Troubleshooting SM Series Heat Pump

SM Series Heat Pump6 720 220 406 (2013/9) Subject to change without prior notice

UNIT OFF ON

HIGH PRESSURE

CONTROL

Discharge

pressure too high

In “COOLING” mode: Lack of or inadequate water flow. Entering water

temperature is too warm. Scaled or plugged condenser. In “HEATING”

mode: Lack of or inadequate air flow. Blower inoperative, clogged filter

or restrictions in duct work

Refrigerant

charge

The unit is overcharged with refrigerant. Reclaim refrigerant, evacuate

and recharge with factor recommended charge.

High pressure

Check for defective or improperly calibrated high pressure switch.

UNIT OFF ON LOW

PRESSURE

CONTROL

Suction pressure

too low

In “COOLING” mode: Lack of or inadequate air flow. Entering air

temperature is too cold. Blower inoperative, clogged filter or

restrictions in duct work. In “HEATING” mode: Lack of or inadequate

water flow. Entering water temperature is too cold. Scaled or plugged

condenser.

Refrigerant

charge

The unit is low on refrigerant. Check for refrigerant leak, repair,

evacuate and recharge with factory recommended charge.

Low pressure

switch

Check for defective or improperly calibrated low pressure switch.

UNIT SHORT

CYCLES

Unit oversized Recalculate heating and or cooling loads.

Thermostat

Thermostat installed near a supply air grill; relocate thermostat.

Readjust heat anticipator.

Wiring and

controls

Check for defective or improperly calibrated low pressure switch.

INSUFFICIENT

COOLING OR

HEATING

Unit undersized Recalculate heating and or cooling loads. If excessive, possibly adding

insulation and shading will rectify the problem

Loss of

conditioned air by

leakage

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

doors or windows

Airflow

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

filter

Refrigerant

charge

Low on refrigerant charge causing inefficient operation

Compressor

Check for defective compressor. If discharge is too low and suction

pressure is too high, compressor is not pumping properly. Replace

compressor.

Reversing Valve

Defective reversing valve creating bypass of refrigerant from discharge

of suction side of compressor. Replace reversing valve

Operating

pressures

Compare unit operation pressures to the pressure/temperature chart

for the unit.

TXV

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

Moisture,

noncondensables

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.

Unit Troubleshooting

Problem Possible Cause Checks and Correction

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Bosch SM070 Specifications Page 48

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