Bosch CA - Specific Troubleshooting and Blower Data; Performance Issues and Blower Specs

Blower performance Data | 17CA Model
8733942456(2016/04)CA Model
BLOWER PERFORMANCE DATA
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, non
condensable
The refrigerant system may be contaminated with moisture or non
condensable. Reclaim refrigerant, replace filter dryer, evacuate the
refrigerant system, and recharge with factory recommended charge.
Unit Troubleshooting
Problem Possible Cause Checks and Correction
MODELS MOTOR SPEED FACTORY SETTING EXTERNAL STATIC
PRESSURE (IN OF WATER)
@ 0” ESP
009
HIGH 300
LOW X 275
012
HIGH 520
LOW X 475
015
HIGH 500
LOW X 450
018
HIGH 520
LOW X 475