Bosch TA049 - Page 27

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Revised 03-11 Subject to change without prior notice
27
TA Series
Troubleshooting
Insufcient
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
Airow Lack of adequate air ow or improper distribution of air. Replace dirty
lter
Refrigerant charge Low on refrigerant charge causing inefcient 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 lter dryer, evacuate the
refrigerant system, and recharge with factory recommended charge.