Taylor C602 - Heat Treatment Graph

34
Systems, Controls and Operations
Model C602
Heat Treatment Graph
During the HEAT and HOLD phases, the glycol is
heated by the use of a glycol heater. During the
COOL phase, the glycol and freezing cylinder
product are refrigerated by the use of the machine’s
main refrigeration system.
At the start of the HEAT phase the glycol heater
begins to overcome the cold freezing cylinder
temperature and the glycol temperature raises
slowly to 178_F(81_C).
The purpose of the HEAT phase is to raise the
product temperature above 150_F(65_C) within 90
minutes. To satisfy the control system, the product
must actually reach 151.5_ F(66_C). This
requirement ensures that the 150_F(65_C)
requirement has been met. Health laws require
these parameters to be 150_F(65_C) in 90 minutes;
however, the actual amount of time the freezer takes
to accomplish this requirement is closer to 60
minutes.
Once the HEAT Phase is complete, it is necessary
to complete the Heat Soak Timer. From the time the
Heat Phase is started, 115 minutes must transpire
before the cool phase may enter. Due to the
implementation of the Heat Soak Timer, the Heat
Cycle Data Screen will now refer to the HOLD phase
as the “OVER” phase.
While in the COOL phase, the beater motor and the
main refrigeration system operate continuously until
the machine first cycles off. For the remainder of the
COOL phase, the beater motor and compressor
operate from a timed cycle. The timed cycle allows
the beater motor to stop for two minutes and then
run for six seconds. During the six seconds that the
beater motor is on, if the viscosity is below setpoint,
the compressor is turned on. When viscosity is
satisfied, the compressor and the beater are turned
off. The timed cycle continues in this manner until
the COOL phase is complete.
Figure 81