Rheem RA17 Series Installation Instructions Manual page 50

DIAGNOSTICS
Service Analyzer Charts
CONTAMINATION
SYMPTOM
Moisture
High head pressure
Unusual head and
suction readings
Foreign matter –
copper lings
Copper oxide
Welding scale
Soldering ux
Excess soft solder
LOSS OF LUBRICATION
SYMPTOM
Compressor failures
Low suction pressure
Cold, noisy
compressor –
Slugging
Noisy compressor
Cold, sweating
compressor
Low load
Short cycling of
compressor
SLUGGING
SYMPTOM
On start-up
TEV hunting when
running
50
POSSIBLE CAUSE
Poor evacuation on installation or during service
Noncondensibles air
Wrong refrigerant or mixed refrigerants
Copper tubing cuttings
Dirty copper piping or nitrogen not used when
brazing
Nitrogen not used during brazing
Adding ux before seating copper partway
Wrong solder material
POSSIBLE CAUSE
Line tubing too large
Low charge
Refrigerant leaks
Dilution of oil with refrigerant
Migration
Flooding
educed air ow
Thermostat setting
Faulty high- or low-pressure control
Loose wiring
Thermostat
POSSIBLE CAUSE
Incorrect piping
Faulty TEV
REMEDY
In each case, the cure is the same. Recover refrigerant.
Add 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 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.