Rheem FO13C Series Installation Instructions Manual page 43

Service Analyzer Charts
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 tubing cuttings
copper fi lings
Copper oxide Dirty copper piping or nitrogen not used when
brazing
Welding scale Nitrogen not used during brazing
Soldering fl ux Adding fl ux before seating copper partway
Excess soft solder Wrong solder material
LOSS OF LUBRICATION
SYMPTOM
Compressor failures Line tubing too large
Low suction pressure Low charge
Refrigerant leaks
Cold, noisy Dilution of oil with refrigerant
compressor –
Slugging
Noisy compressor Migration
Cold, sweating Flooding
compressor
Low load Reduced airfl ow
Thermostat setting
Short cycling of Faulty high- or low-pressure control
compressor
Loose wiring
Thermostat
SLUGGING
SYMPTOM
On start-up Incorrect piping
TEV hunting when Faulty TEV
running
POSSIBLE CAUSE
POSSIBLE CAUSE
POSSIBLE CAUSE
DIAGNOSTICS
REMEDY
In each case, the cure is the same. Recover refrigerant.
Add fi lter drier, evacuate, and recharge.
REMEDY
Reduce pipe size to improve oil return.
Check system charge.
Repair and recharge.
Observe piping guidelines.
Check crankcase heater.
Check system charge.
Dirty fi lter
Dirty coil
Wrong duct size
Restricted duct
Advise customer.
Replace control.
Check all control wires.
In supply air stream, out of calibration
Customer misuse
REMEDY
Review pipe size guidelines.
Replace TEV.
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