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11
Sequence of Operation.
Operation of Refrigeration.
1. When switch is turned on, power is provided to the temperature control, compressor,
condenser and evaporator fan motor. And they will run until the box temperature setting is
reached.
2. When the box temperature reaches a setting, the compressor and condenser fan motors shut
off while evaporator fan motor is working.
3. When the box temperature rises above the set point and minimum off-time has elapsed, the
compressor contactor will be re-energized and re-operated.
Operation of Defrost.
1. Under normal electric defrost operation, the temperature/defrost control will de-energize the
compressor contactor, evaporator fans and energize the defrost heaters. But under normal air
defrost operation, the control will de-energize the compressor contactor and keep an
evaporator fan motor working.
2. When the coil has defrosted completely and reached the preset coil sensor temperature,
defrost heater cuts off and fan delay / drip sequences begin.
3. The control energizes the compressor and condenser fan motor and they restart.
4. When the coil temperature reaches 65
℉
or fan delay time has elapsed, the evaporator fans
will be energized and started.
Содержание SMART 7 STI022LR404A2
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