Taylor McDonald's C602 - HARD LOCK AND SOFT LOCK FAILURES; Hard Lock Failure Conditions and Indicators

76
DO NOT attempt to draw product or
disassemble the unit during the HEAT cycle.
The product is hot and under extreme
pressure.
In the HEAT cycle, the mix tempe rat ure in the
hoppers and freezing cylinders must be raised
to 151
_F (66.1_C) within 90 minutes.
When the heating phase is complete, the
freezer goes into the holding phase of the
cycle. The holding phase will keep the temper-
ature above 151
_F (66.1_C) for a minimum of
30 minutes.
The final phase of the heat treatment cycle is
the cooling phase. The freezer must cool the
mix below 41
_F(5_C) within two hours.
When the entire heat cycle has been
completed, the HEAT symbols
will no
longer be illuminated. The machine will enter
the STANDBY mode (STANDBY symbols
and illuminate). The machine can be placed
in AUTO or left in STANDBY.
Heat Cycle Failure Messages
To comply with health codes, heat treatment
system freezers must complete a heat
treatment cycle daily, and must be
disassembled and brush cleaned a minimum
of every 14 days. Brush cleaning is the normal
disassembly and cleaning procedure found in
this manual. Failure to follow these guidelines
will cause the control to lock the freezer out of
the AUTO mode.
Alwa ys comply with local guidelines for the
maximum number of days allowed between
brush clean cycles. (See the Manager’s Menu
for setting the Brush Clean interval, on
page 82.)
There are two types of freezer lock conditions
that can occur: Hard Lock or Soft Lock. A Hard
Lock requires the machine be disassembled
and brush cleaned. A Soft Lock can be
corrected by either disassemblin g and brush
cleaning the machine, or by starting another
heat treatment cycle.
Hard Lock: There are two causes of a hard
lock failure:
1. The brush clean timer has elapsed
(maximum setting of 14 days).
(See Figure 166.)
BRUSH CLEAN TIMEOUT
FREEZER LOCKED
CLEANING REQ’D
WASH TO BRUSH CLEAN
Figure 166
Selecting the WASH symbol will
display the following screen.
(See Figure 167.)
FREEZER LOCKED
Figure 167
2. There has been a thermistor failure
(freezing cylinder, hopper, or glycol)
during the heat treatment process.
(See Figure 168.)
SYSTEM FAULT
FREEZER LOCKED
SERVICE REQ’D
< PRESS TO CLEAR
Figure 168
Selecting the CALIBRATE symbol will
indicate which thermistor caused the Hard
Lock. (See Figure 169.)
L: HOPPER THERM BAD
FREEZER LOCKED
Figure 169
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