Rheem R-410A Installation Instructions Manual page 46

SYMPTOMS
Short cycling of compressor (cont.)
Faulty Compressor Valves
ELECTRICAL
SYMPTOMS
Voltage present on load side
of compressor contactor and
compressor won't run
Voltage present on line side of
pressor contactor only
No voltage on line side
of compressor contactor
Improper voltage
CONTAMINATION
SYMPTOMS
Moisture
High head pressure
Unusual head and suction readings
Foreign Matter-
copper filings
Copper oxide
Welding scale
Soldering flux
Excess soft solder
46
POSSIBLE CAUSE
Low charge
Low evaporator air flow
Faulty run capacitor
Faulty internal overload
Fast equalization/
Low pressure difference
POSSIBLE CAUSE
Compressor start components
Run capacitor
Internal overload
Compressor windings
Thermostat
Compressor control circuit
Blown fuses or tripped circuit breaker
Improper wiring
High voltage
Low voltage
Single Phasing (3 phase)
POSSIBLE CAUSE
Poor evacuation on installation
or during service
Non-condensibles air
Wrong refrigerant
Copper tubing cuttings
Dirty copper piping
Nitrogen not used
Adding flux before seating
copper part way
Wrong solder material
CHECK OR REMEDIES
Check system charge
Dirty coil
Dirty filter
Duct too small or restricted
Replace
Replace compressor
Replace compressor and examine
system to locate reason
CHECK OR REMEDIES
Check start capacitor
Check potential relay
Check with ohmmeter
Allow time to reset
Check for correct ohms
Check for control voltage to com-
contactor coil
High pressure switch
Low pressure switch
Ambient thermostat
Solid state protection control or
internal thermal sensors
Compressor timed off/on
control or interlock
Check for short in wiring or unit
Re-check wiring diagram
Wrong unit
Power supply problem
Wrong unit
Power supply problem
Wiring undersized
Loose connections
Check incoming power and fusing
CHECK OR REMEDIES
In each case, the cure is the same.
Recover refrigerant. Add filter drier,
evacuate and re-charge