Forma
Model 700 Series ______________________________________________Service
5-1
Section 5 - Service
4.1 Servicing the Refrigeration System
Servicing must be only performed by service personnel qualified to
repair cascade refrigeration systems. Always use standard safety
practices when servicing any equipment.
Before opening the refrigeration system, use the troubleshooting chart below to check
out the electrical system. Electrical schematics and refrigeration drawings with part numbers
are included in this manual.
Symptom Possible Cause
No Temperature Display.
•
Power line cord disconnected or not
properly installed.
•
External power circuit breaker
tripped/open.
•
Main power switch OFF.
•
24V transformer fuses open.
Chamber Temperature Deviates from
Setpoint.
•
Too much warm product added.
•
Lid open too long.
•
Inadequate air circulation.
•
Unit is out of calibration.
•
Dirty condenser.
•
High ambient temperature.
Too Much Frost Build-Up.
•
Lid not properly sealed
Freezer not Being Refrigerated
(Unit is receiving Power).
•
Compressor thermal overload open.
•
Defective temp control.
•
Defective high pressure cut-off.
•
Defective compressor(s).
•
Loss of refrigerant.
Display Problems in General.
•
Defective temp control board.
Condenser Hot Light On
•
Dirty air filter.
•
Dirty condenser fan.
•
Fan failure.
