Norlake DAIRY QUEEN BLIZZARD STATION ZR112 Instrucciones De Instalación, Operación Y Mantenimiento página 4

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
Pan Area
Nor-Lake, Inc. • PO Box 248 • Hudson, WI 54016 • 800-388-5253 Service • 715-386-2323 Sales • 715-386-6149 FAX
MAINTENANCE SERVICE AND ANALYSIS GUIDE
REFRIGERATION SYSTEMS - ALL MODELS
POSSIBLE CAUSE
1. Service cord unplugged
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-return gas hot 4. Check refrigerant charge, fix leak if
1. Short of refrigerant
2. Control contact stuck
3. Evaporator coil iced
4. Restriction in refrigeration
system
5. Dirty condenser
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
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. No cooling
2. Too cold
3. Too warm
SOLUTION
1. Plug in service cord
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
necessary
1. Fix leak, add refrigerant
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
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. Make sure switch is in the "on" position
2. Adjust temperature control - see instructions
under pan area
3. Adjust temperature control - see instructions
under pan area
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