Bosch LM Series, Инструкция по установке, эксплуатации и обслуживанию

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Troubleshooting | 25 LM Series Heat Pump
8 733 905 315 (2013/9) Revised 09-13
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