19
Models 150, 152, 162, 168
Controls and Systems
TQC Control
Function:
The TQC maintains product quality in the freezing
cylinder by electronically monitoring the product
viscosity.
Specifications:
Part No. Function Voltage
028022-12 Supply voltage 115VAC-60Hz
028022-27 Supply voltage 208-240 VAC - 50/60 Hz
Viscosity Range Selections
1.2 -- 2.4 Amps
2.5 -- 5.0 Amps
4.0 -- 8.0 Amps
5.7 -- 11.4 Amps
Operation
The TQC monitors product viscosity (thickness) by
constantly reading the amperage drawfrom the beater
motor. As the product freezes, the beater motor works
harder to turn the beater assembly through the frozen
product. This causes a gradual increase in beater
motor amperage. When the desired product viscosity
is attained, the TQC cancels the refrigeration system.
Note: The solid state timer in the control circuit will
also activate the main refrigeration system. The
freezer draw switch or solid state timer reactivates the
refrigeration syst em when necessary.
The TQC becomes operational when power is
supplied to the freezer. With the freezer properly
primed and the necessary control switches placed in
the AUTO position, the draw lever is manually raised
to start the main refrigeration system once the
off-cycle time has elapsed.
The L1 power supplied to the compressor contactor
coil passes through the TQC (socket connection #2
and #3).
The L1 power supplied to the beater motor must first
pass through theTQCrelay (socket connection #5and
#6).
When the viscosity setting is attained, the TQC relay
is activated (#2 and #3 is open) to discontinue sending
L1 power to the compressor coil. the refrigeration
system cycles off, the beater motor amperage drops
to zero amps, and the TQC relay relaxes (#2 and #3
closed).
Once the refrigeration system has cycled off, the solid
state timer is activated. When the off-cycle time has
elapsed, the solid state timer sends L1 power through
the TQC (socket connection #2 and #3) to the coil of
the compressor contactor. The compressor contactor
initiates compressor operation and also supplies L1
power to run the beater motor. The solid state timer
resets to zero each time the compressor contactor
closes.
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