Troubleshooting Tips - Rheem A17 Series Installation Instructions Manual

10.0 DIAGNOSTICS AND TROUBLESHOOTING
10.7 Service Analyzer Chart (cont.)
FLOODING
SYMPTOM
Oversized EXV
Superheat and
Unequal refrigerant flow through evaporator circuit Ensure suction line thermistor is in correct location in a
suction pressure
fluctuate (EXV is
Moisture freezing and partially blocking EXV
hunting)
External equalizer line not connected or line
plugged
TXV does not
Sensing bulb lost its operating charge
regulate at all
Valve body damaged during soldering or by im-
proper installation

10.8 Troubleshooting Tips

SYSTEM
PROBLEM
Overcharge
Undercharge
Liquid Restriction
(Filter Drier)
Low Indoor Airflow
Dirty Outdoor Coil
Low Outdoor
Ambient Temperature
Inefficient
Compressor
Indoor TXV Sensing
Bulb Charge Lost or
Bad Thermistor
Poorly Insulated
Indoor TXV Sensing
Bulb or Thermistor.
Bad Thermistor.
48
POSSIBLE CAUSE
COOLING MODE
TROUBLESHOOTING TIPS
DISCHARGE SUCTION
PRESSURE PRESSURE
High High
Low Low
Low Low
Low Low
High High
Low Low
Low High
Low Low
High High
CHECK OR REMEDIES
Install correct EXV
clean section of copper pipe
Recover refrigerant, change filter-drier, evacuate system
and recharge
Connect equalizer line in proper location, or remove any
blockage
Replace TXV
Replace the TXV
INDICATORS
SUPERHEAT SUBCOOLING
Normal: 5 o -15 o F
Normal: See
[2.8 o -8.3 o C]
Charging Chart
Low
High
High
Low
Low
High
High
High
Low
COMPRESSOR
AMPS
High High
Low Low
High Low
Low Low
Low High
High Low
High Low
High Low
Low High