14
Controls and Systems
Models 150, 152, 162, 168
Temperature Control
Function
The temperature control maintains product
temperature in the freezing cylinder.
Specifications
Temperature differential: cut in = 2_F(1.1_C) above
cut out. Temperature adjustment screw: 1/4 turn =
approximately 2_F(1.1_C). Clockwise adjustments
are colder and counterclockwise adjustments are
warmer.
Anticipator resistance -- approximately 25 OHMS.
Operation
The gas filled sensing bulb is positioned in the
bulb-well, located at the front of the freezing cylinder .
As the temperature lowers in the freezing cylinder , the
gas in the sensing bulb decreases in pressure. When
the desired product temperature setting is achieved,
the springactivated switch overcomes the pressureon
the diaphragm, the switch points open (terminal #2
opens to #1), andL1powersuppliedtothecompressor
relay coil deactivates.
When the product temperature has risen 2_F(1.1_C)
above the control’s temperature setting, the increased
gas pressure on the diaphragm overcomes the switch
spring tension. The switch points close (terminal #2
closed to #3) and L1 power is supplied to the
compressor relay coil.
Anticipator
When the temperature control is not calling for
refrigeration andproduct is drawn from the freezer ,the
anticipator circuit activates the refrigeration system.
When the freezer draw switch is activated, a
transformer supplies 24 volts to the anticipator leads.
The sensing bulb is heated by the 24 volts, and the
refrigeration system will operate when the 2_F(1.1_C)
temperature differential is achieved.
Note: When the draw switch activates, the
compressor will start within 15 seconds.
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