Heatcraft Refrigeration Products 25001501 Installation & Operating Instructions Manual page 20

SERVICE DIAGNOSIS CHART - BEACON (cont'd.)
PROBLEM
Beacon Board Status
Light Flashes Erratically
SERVICE DIAGNOSIS CHART - GENERAL
PROBLEM
Compressor will not run
Compressor noisy or
vibrating
High head pressure
Low head pressure
High suction pressure
BEACON CONTROLLER
POSSIBLE CAUSE
1. Supply voltage too high
2. Supply voltage too low
3. Bad board
POSSIBLE CAUSE
1. Fused disconnect switch is open
2. Blown Fuse
3. Compressor motor protector open
4. Defective compressor contactor
or holding coil
5. Open room air sensor (air into coil)
6. Compressor discharge too hot
7. Open low pressure, high pressure
or oil safety control
8. Motor problems
9. Loose wiring
1. Flooding of liquid refrigerant into
into crankcase
2. Compressor hold-down nuts too
tight or too loose
3. Worn compressor/bad valves
1. Too much refrigerant
2. Non-condensables in the system
3. Dirty condenser coil
4. Condenser fan not running
5. Discharge valve partially closed
6. System running beyond condensing
temperatures due to heavy load
or out of equipment design paramaters
1. Insufficient refrigerant
2. Damaged valves in compressor
3. Winter operation w/o head
pressure valve
1. Expansion valve over-feeding
2. High box temp. pull-down
3. System undersized
POSSIBLE CORRECTIVE ACTION
1. Check 24 volt supply; if above 30 volt
correct immediately.
2. Change transformer primary to correct supply
voltage tap. 208 or 240 volts.
POSSIBLE CORRECTIVE ACTION
1. Close switch
2. Check reason fuse is blown; replace fuse
after problem is corrected.
3. Motor protector is automatic reset; allow
time for compressor to cool down so that
protector will reset; check unit for reason
when compressor restarts.
4. Replace
5. Check room air sensor; if open, replace. After
reconnecting, wait 4 mins. for compressor to
restart.
6. Lower evaporator superheat to lower
compressor suction gas temperature
7. Check control settings
8. Check motor for open circuit, short circuit,
grounded windings or burn-out
9. Check all wire terminals; tighten if necessary
1. Check expansion valve superheat setting
on control board
2. Loosen compressor hold-down nuts until
compressor floats freely on mounting springs
3. Replace
1. Remove excess refrigerant
2. Purge system of non-condensables
3. Clean condenser coil
4. Check electrical circuit, including fuses
5. Open valve
1. Check system for leaks; repair leaks &
add refrigerant
2. Replace compressor
3. Check refrigerant charge
1. Check expansion valve superheat setting
on control board
2. Wait for box temp. to drop
3. Check load & design criteria
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