Rheem A17 Series Installation Instructions Manual page 45

10.7 Service Analyzer Chart (cont.)
CONTAMINATION
SYMPTOM
Moisture Poor evacuation on installation or during service
High head pressure Noncondensibles air
Unusual head and Wrong refrigerant or mixed refrigerants
suction readings
Foreign matter - copper Copper tubing cuttings
filings
Copper oxide Dirty copper piping or nitrogen not used when brazing
Welding scale Nitrogen not used during brazing
Soldering flux Adding flux before seating copper partway
Excess soft solder Wrong solder material
LOSS OF LUBRICATION
SYMPTOM
Compressor failures Line tubing too large
Low charge
Low suction pressure
Refrigerant leaks
Cold, noisy compressor Dilution of oil with refrigerant
- Slugging
Noisy compressor Migration
Cold, sweating com- Flooding
pressor
Reduced airflow
Low load
Thermostat setting
Cycling or faulty high or low-pressure control
Short cycling of com-
Loose wiring
pressor
Thermostat
SLUGGING
SYMPTOM
On start-up Incorrect piping
TXV hunting when Fault TXV
running
10.0 DIAGNOSTICS & TROUBLESHOOTING
POSSIBLE CAUSE
POSSIBLE CAUSE
POSSIBLE CAUSE
CHECK/REMEDY
In each case, the cure is the same. Recover re-
frigerant. Add filter drier, evacuate and recharge
CHECK/REMEDY
Reduce pipe size to improve oil return
Check system charge
Repair and recharge
Observe piping guidelines
Check crankcase heater
Check system charge
Dirty filter
Dirty coil
Wrong duct size
Restricted duct
Advise customer
Check pressures and address cause of any
abnormal pressure. Replace control if faulty
Check all control wires
In supply air stream, out of calibration
Customer misuse
CHECK/REMEDY
Review pipe size guidelines
Replace TXV
45