Taylor C602, Service Manual

Page: 40 / 114

37
Model C602
Systems, Controls and Operations
Glycol System
The following information describes the glycol
system. For further understanding, see the Glycol
Path diagram at the end of this chapter.
The glycol system serves two purposes. During the
STANDBY and AUTO modes, the glycol is used to
cool the mix hoppers. During the HEAT mode, the
glycol is used to heat the mix in the hopper(s) and
freezing cylinder(s).
Glycol is a heat transfer medium made up of 50%
ethylene glycol and 50% distilled water.
Note: It is factory recommended to drain, flush and
re-supply a fresh glycol mixture on a two-year
maintenance schedule.
Standby and Auto
During a refrigeration mode, the freezing cylinders
are cooled using refrigerant, and the product is
controlled by viscosity during the AUTO mode and
by temperature during the STANDBY mode.
The hoppers are cooled in the following manner:
When a hopper temperature reaches the cut-in
point, the glycol pump, solenoid valve, and beater
stir cycle are all activated.
The glycol lines go (in order) through the heater,
through the solenoid valve, around the freezing
cylinder, and then to the hopper. In other words, the
glycol is cooled directly by the freezing cylinder walls
and is then pumped to the hoppers to cool the mix.
Each hopper has one thermistor probe and can
function independently.
Note: The heater is OFF during refrigeration
modes.
In each hopper, there is an agitator paddle which is
used to distribute the heat or cold evenly throughout
the mix so the mix does not freeze or burn on the
sides of the hopper. It runs continuously when the
freezer is in the AUTO, STANDBY or HEAT mode.
The agitator is driven by a motor and belt(s).
The Heat Treatment Cycle
During the heating phase the heater is activated. For
shake application, beater agitation will continue until
the compressor cycles off. For soft serve
application, the beater will agitate for six seconds
every two minutes until the freezing cylinder product
rises above 135
_
F (57
_
C).
During the HEAT phase, all refrigeration is
cancelled, and the glycol will heat the freezing
cylinder(s) and the hopper(s) to the set
temperatures.
WARNING: Ethylene glycol is very
harmful to your health. Swallowing glycol is
fatal. Refer to M.S.D.S. Guidelines.
Note: If the glycol is purchased from the factory, it
is pre-mixed and ready to use. Otherwise, glycol
should be mixed with distilled water in a ratio of 50%
glycol and 50% distilled water.
Installing the Glycol Mixture
Step 1
Attach a hose (capable of depressing the shraeder
valve) to the 1/4” flare fitting located beneath the
accumulator tank. Remove the cap from the
accumulator and place the opposite end of the hose
into the accumulator tank.
Step 2
Using a pair of pliers, squeeze the tube located
between the access fitting and the tube that leads to
the bottom of the glycol accumulator tank.
Step 3
Fill the accumulator tank 2/3 full.
Step 4
Remove the necessary panels to expose the shake
interface board. Locate the test pins marked, “W2,
W3, W4, and W5”. Place a two pin jumper on the
test pins marked “W4”. The jumper will activate the
glycol pump and open the glycol solenoids (if
applicable). The glycol existing in the accumulator
will be pumped through the glycol system.