SERVICE INSTRUCTIONS (Trouble Shooting Guide)
1.High head pressure and high back pressure:
A.Condenser coil clogged or restricted.
B.Condenser fan motor defective.
2.Low back pressure and low head pressure:
A.Restriction in system.
B.Refrigerant undercharged.
C.Leak in system.
3.Pressures normal – cabinet warm:
A.Coil blocked with frost or ice (see #4).
B.Refrigerant undercharged.
C.Control set too warm.
D.Air screen disturbance.
4.Coil blocked with frost or ice:
A. | Defective temperature control. | E. | |
B. | Time clock not operating properly. | F. | Doors aren’t sealing when closed. |
C. | Improper time clock setting. | G. | Evaporator fan motor defective. |
D. | Defrost heater not operating. | I. | Low voltage. |
5.Compressor starts and runs – but cycles on overload:
A.Low voltage.
B.Dropped phase (3 phase).
C.Overload protector defective.
D.High head pressure (see#1).
6.Compressor will not start – hums, but cycles on overload:
A.Low voltage.
B.Relay defective.
C.Overload defective.
D.High head pressure (see #1).
7.Special service situations:
If moisture or liquid is observed around or under a
Moisture or liquid around or under a cabinet is a potential slip/fall hazard for persons walking by or working in the general area of the cabinet.
Any cabinet malfunction or housekeeping problem that creates a slip/fall hazard around or under a cabinet should be corrected immediately.
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