HEC-Series Service Manual
TROUBLESHOOTING
10/21/01
8-3
Symptom: Freeze-up due to ice failing to discharge.
Check for Fault #14 Short Cycle (see note below)
Possible Cause
Possible Remedy
Low condensing pressure during freezing
resulting in insufficient heat for thawing.
See Head Pressure, Section 9.
Thawing timer setting too short to allow ice to
clear freezer.
Check PLC thaw timer setting. See PLC
Thawing Timer, Section 9.
Insufficient heat for thawing due to low
refrigerant charge.
See Refrigerant Charge, Section 6.
Non-condensable gases (usually air) in system.
See Non-Condensable Gases, Section 9.
Cutter does not turn.
Check cutter drive for proper operation. See
that drive gear is tight on cutter motor shaft.
Check circuit breaker. Replace breaker if
defective. Check PLC output fuse (FU5).
Replace if blown and check operation.
Ice backs up into cutter, jamming it.
If machine discharges into an ice chute, check
angle of chute (30
°
minimum angle for cylinder
ice; 45
°
for crushed ice). Ice may not contact
bin thermostat control bulb to stop machine
when bin is filled. See Ice Bin Thermostat,
Section 9, and Bulb Installation, Section 3,
FIGURE 3-12.
Ice fails to discharge from cutter area properly. Ice mushy due to concentration of solids in
water pan. Drain and clean water tank. Check
“blowdown” during thawing. See Float Valve
(make-up water), Section 9.
Inadequate flow of refrigerant through thawing
chamber (16) to provide sufficient heat to
prevent ice freezing at lower freezer tube head.
Irregular operation of expansion valve (liquid
line should stay frosted on outlet side during
freezing). Check expansion valve bulb and re-
insulate if necessary. Check for restriction in
liquid line at drier (46) or solenoid valve (20).
Broken cutter disc or drive pin.
Replace disc or pin.
CPR valve pressure set too low.
Adjust valve, see Section 9, FIGURE 9-14 and
TABLE 9-2.
A machine Fault #14 has occurred.
Enter the troubleshoot mode and identify the
last occurring fault. See Fault Identity,
Section 6, TABLE 6-2.
Summary of Contents for HEC-10
Page 1: ...HEC SERVICE MANUAL ...
Page 95: ...HEC Series Service Manual SERVICE OPERATIONS 10 21 01 9 13 FIGURE 9 9 Cutter Water Tank Parts ...
Page 96: ...HEC Series Service Manual SERVICE OPERATIONS 10 21 01 9 14 FIGURE 9 10 Cutter Drive Parts ...
Page 97: ...HEC Series Service Manual SERVICE OPERATIONS 10 21 01 9 15 FIGURE 9 11 Cutter Parts ...
Page 106: ...HEC Series Service Manual MODEL NUMBER STRUCTURE 10 21 01 10 1 10 Model Number Structure ...
