Cornelius 500-Series Installation And Service Manual page 29

NO POWER
Remote condenser
units only
Check electrical wiring in con-
trol box for loose connec-
tions.
Remote condenser
Check for failed service
not running.
switch or relay.
Check power to machine.
High pressure Check electrical
switch open or wiring in control box
cycling on and off. for loose connections.
Discharge Non-condensible Too much
king valve in system. refrigerant in
partially system.
closed.
Evacuate and
Check electrical circuit
Open
recharge system.
valve
Clean condenser.
Low pressure switch open
or cycling on and off.
Remote condenser
Low on
units only
refrigerant.
Check for LAC not operating
leaks. properly (minimum
discharge pressure
180 lbs.).
Replace LAC valve,
evacuate and
recharge system.
TROUBLESHOOTING CHART -- ICEMAKER NOT OPERATING
ICEMAKER RUNS BUT
DOES NOT MAKE ICE
Condenser fan running
but compressor not running
Check line voltage.
Check compressor winding
& components.
Evaporator water tube
may have an air bubble.
Check power
Clear air bubble from
to condenser.
tube.
High suction pressure
(30 lbs. or above).
Head
Pressure
high.
Condenser Condenser
fan not dirty or
Valve
running. restricted.
stuck
open.
Replace
valve.
to fan motor.
Check fan motor.
Plugged
Restricted
Plugged or
liquid line
liquid line.
faulty TXV.
dryer.
Replace Check for Replace
dryer. kinks or valve.
Evacuate damage to Evacuate
and liquid line. and
recharge recharge
system. system.
Check drive on
gearmotor.
LOW WATER SAFETY
SWITCH OPEN
Check that water is turned on.
Check for restriction in water line.
Check incoming water pressure
(minimum 10 lbs.).
Check water safety switch.
Low suction pressure
(20 lbs. or below).
TXV not Suction line
TXV bulb
operating not
lost charge.
properly. insulated.
Bulb Bulb
Replace valve
loose. uninsulated.
evacuate and
recharge.
Clean Clean and
and insulate.
tighten.
Icemaker
froze up.
Check if
auger is OVERLOAD GUIDE
turning. ELECTRICAL
High or low voltage weak power lines can cause overloads on icemaker restarts
High running current. Check motor circuits and start relay -- Auger delay failed.
ICEMAKER
Mechanical parts worn. Scored evaporator or auger. Worn thrust bearing.
Ice maker not turning off. Failed ice level control.
No
Over compression. Low water inlet temperature. Restriction in water line from
reservoir.
REFRIGERANT
Contaminated charge or bad compressor.
Low charge or gas leak.
Low suction pressure. Improper expansion valve sensing bulb. Location or insulation
and/or defective expansion valve
Check if extruding
Check gears in
head is down in
gearbox.
evaporator tube.
ICEMAKER OPERATING BUT
SOFT ICE
Check bin switch
Yes No
Clean all related Refer to guide
drain lines. to Good Ice in
service manual.
auger before re-
Icemaker runs
IMPORTANT Short run trips
Icemaker runs when reset again in 2 min-
but problem has not been utes. Check gear-
found. motor circuit.
Continue checking for
overload as follows to
guard against future
problems
GEARMOTOR OVERLOAD
TRIPPED
Check water level control
and evaporator water tube
for lime build up restriction.
No
Yes
CAUTION
CLEAN
Clear ice from
see
evaporator and
instructions.
setting over-
load.
Reset
overload.
Reset but Will not
motor does reset.
not run.
Check Overload
gearmotor hot try
circuit. again.
Will not
reset
replace
overload