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N
OR
MALFUNCTION
Compressor will not start -
no hum
Compressor will not start -
hums but trips on overload
protector
Compressor starts and runs,
but short cycles on overload
protector
Compressor operates long
or continuously
Compressor runs fine, but
short cycles
Starting capacitor open,
shorted or blown
Relay defective or burned out
Refrigerated space too warm
Standard temperature system
freezes the product
Objectionable noise
Water overflowing from
evaporator drain pan or
condensate vaporizer pan
19
-L
, I
. C
AKE
NC
APSULE
POSSIBLE CAUSE
1. Unplugged or power off
2. Fuse blown or removed
3. Overload tripped
4. Control stuck open
5. Wiring incorrect
1. Improperly wired
2. Low voltage to unit
3. Starting capacitor defective
4. Relay failing to close
1. Low voltage to unit
2. Overload defective
3. Excessive head pressure
4. Compressor hot — warm ambient
conditions
1. Short of refrigerant
2. Control contact stuck
3. Evaporator coil iced
4. Restriction in refrigeration system
5. Dirty condenser —warm ambient
conditions
1. Overload protector
2. Cold control
3. Overcharge
4. Air in system
5. Undercharge
1. Relay contacts stuck
2. Low voltage to unit
3. Improper relay
1. Incorrect relay
2. Voltage too high or too low
1. Control setting too high
2. Refrigerant overcharge
3. Dirty condenser
4. Evaporator coil iced
5. Not operating
6. Air flow to condenser or
evaporator blocked
7. Warm ambient conditions
1. Control setting is too low
2. Control points stuck
1. Fan blade hitting fan shroud
2. Tubing rattle
3. Vibrating fan blade
4. Condenser fan motor rattles
5. General vibration
6. Worn fan motor bearings
1. Air leak between Capsule Pak™
and walk-in panel.
2. Drain line from evaporator drain
pan to condensate vaporizer is
blocked with foreign material.
3. Drain line from evaporator drain
pan to condensate vaporizer is
blocked with ice.
4. Walk-in operating in high humidity
environment (heavy door usage).
P
™ M
AK
AINTENANCE
SOLUTION
1.
Plug in service cord or turn power on
2.
Replace fuse
3.
Determine reasons and correct
4.
Repair or replace
5.
Check wiring against the diagram
1.
Check wiring against the diagram
2.
Determine reason and correct
3.
Determine reason and replace
4.
Determine reason, correct or replace
1.
Determine reason and correct
2.
Check current, replace overload protector
3.
Check ventilation or restriction in
refrigeration system
4.
Check refrigerant charge, fix leak if
necessary
1.
Fix leak, add charge
2.
Repair or replace
3.
Determine cause, defrost manually
4.
Determine location and remove restriction
5.
Clean condenser
1.
Check wiring diagram
2.
Differential too close - widen
3.
Reduce charge
4.
Purge and recharge
5.
Fix leak, add refrigerant
1.
Clean contacts or replace relay
2.
Determine reason and correct
3.
Replace
1.
Check and replace
2.
Determine reason and correct
1.
Reset control
2.
Purge refrigerant
3.
Clean condenser
4.
Determine reason and defrost
5.
Determine reason, replace if necessary
6.
Remove obstruction for free air flow — no storage
on top of walk-in
7.
Ambient conditions should be 90° or less
1.
Reset the control
2.
Replace the control
1.
Reform or cut away small section of shroud
2.
Locate and reform
3.
Replace fan blade
4.
Check motor bracket mounting, tighten
5.
Compressor suspension bolts not loosened
on applicable models - loosen them
6.
Replace fan motor
1.
Check that Capsule Pak™ is properly set
in panel opening.
2.
Clean blockage from inside of drain line.
3.
Check that drain line heater (on freezers)
is working and repair or replace as required.
4.
Plumb drain line from evaporator to floor
drain or replace high gas vaporizer with
electric vaporizer. Consult factory for
further information.
© 2008 Nor-Lake 4/08 PN 121430
A
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