9
FINAL CHECK LIST
A. Check setting of defrost timer:
1. Four defrost/24 hours, with 30 minute fail safe. (TAF ONLY)
B. Check operating pressures.
C. Check electrical requirements of unit to supply voltage.
D. Set temperature control for desired temperature range.
E. Check sight glass for proper refrigerant charge.
F. Check system for proper defrost settings and operation.
G. Check condensing unit for vibrating or rubbing tubing. Dampen and clamp as required.
H. All valves should be completeley open counter-clockwise.
I. Check packing nts on all service valves.
J. Replace all service valve caps and latch unit covers.
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. P-trap in drain not installed.
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).
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