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03TA Service Manual
SYMPTOM: Freeze-up due to ice failing to discharge.
POSSIBLE CAUSE
Insufficient heat for thawing because of low
condensing
(usually air) in system, low refrigerant charge,
or thaw gas solenoid valve stuck closed.
Thawing time too short.
Cutter or cutter disc does not turn.
Ice backs up into cutter or discharge opening,
jamming cutter
Extended freeze period.
Compressor not unloading.
2/14/07
pressure,
non-condensables
POSSIBLE REMEDY
The head pressure should be maintained at
approximately 210 PSIG for R-22 or 250
PSIG for R-404a, which relates to 105
(37.8 C). This is done by a water-regulating
valve (water-cooled units) FIGURE 9-5A,
Section 9, or a Fan cycling switch (air-cooled
units) FIGURE 9-5B, Section 9.
condensables are present with the refrigerant,
the saturated temperature will not relate to the
pressure reading at the receiver.
refrigerant level in the receiver should be near
the operating mark at the end of a freezing
cycle
to
provide
harvesting. (1" = approx. 5.5 lbs. of R-22 or
R-404a).
Check the thaw timer (T), which should be
adjusted to allow all the ice to clear the cutter
and ice discharge opening with at least 30
seconds to spare.
Check cutter reducer and drive gear for proper
operation and alignment. Check for broken
cutter disc or drive pin and replace as
necessary.
Ice mushy due to concentration of solids in the
water tank. Perform "Cleaning Procedure" and
check automatic and adjustable blowdown. If
the machine discharges ice into a chute, it
should slope at an angle of 30 degrees for
cylinder ice and 45 degrees for crushed ice.
Check bin stat or level control to make sure it
will stop the machine before ice backs-up into
the cutter.
Check freezer pressure switch adjustment; see
FIGURE 9-3, Section 9, (Freezer Pressure
Switch) and TABLE 11-6, Section 11
(Operating Vitals).
Check compressor amps during harvest. A
noticeable drop in amperage should occur.
Check unloader solenoid coil. If coil is okay,
replace unloader head assembly.
TROUBLESHOOTING
o
F
If non-
The
enough
volume
for
8-5
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