26 | MULTI- ZONE / FROZEN FOOD VENDOR • 3576 • 4222618A
TEMPERATURE CONTROL
To prevent damage to the refrigeration unit when it is turned off or the
power is interrupted, the refrigeration unit will not restart for at least five
minutes regardless of the temperature.
SENSORS
Temperature sensor(s) are positioned to best represent the product temperature.
The sensor(s) are monitored by the controller program. The refrigeration and
heater systems are activated depending on the target temperature setting or
SET POINT. The total allowable temperature variation from the SET POINT is
DELTA.
SENSOR
1 IS located on right side towards the back between trays 4 and 5 and
controls the bottom zone temperature of the multi-zone by switching the
compressor on and off. Sensor 1 is not used if the machine is configured as a
single zone.
SENSOR
2 IS located on right side of the evaporator and mounted to the top tube
with a copper clip and tie strap. Sensor 2 is used to measure evaporator
temperature and terminates a defrost cycle when the coil reaches 50°F.
SENSOR
3 IS located on right side towards the back between trays 1 and 2 and
controls the upper zone temperature by switching the foil heater on and off when
machine is configured as a multi-zone. If the machine is configured as a single-
zone cold or frozen, Sensor 3 controls the entire cabinet temperature by
switching the compressor on and off.
Figure 8a. Single Zone Airflow
Figure 8b. Multi- Zone Airflow
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