SERVICE INSTRUCTIONS
1.High head pressure and high back pressure:
A.Condenser coil clogged or restricted
B.Condenser fan motor defective.
C.Air discharge in rear of cabinet restricted.
2.Low back pressure and low head pressure:
A.Restriction in system.
B.Refrigerant undercharged.
C.Leak in system
3.Pressure normal – cabinet warm:
A.Coil blocked with frost (see #4).
B.Refrigerant undercharged.
C.Control set too warm.
4.Cabinet not cycling – coil blocked with frost:
A.Defective temperature controller.
B.Refrigerant overcharged.
C.Location too hot.
D.Condenser clogged.
E.Condenser fan motor defective.
5.Compressor starts and runs – but cycles on overload:
A.Low voltage
B.Relay defective.
C.Overload defective.
D.High head pressure (see #1).
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