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Thermostats

Sunday, February 25, 2018

The most common application for thermostats is room temperature control, in which regard it does not matter whether this involves a cold room, a cooling cabinet for liquor, or even a simple refrigerator.

Chapter 1. Thermostats

The most common application for thermostats is room temperature control, in which regard it does not matter whether this involves a cold room, a cooling cabinet for liquor, or even a simple refrigerator. 

 

The tasks of a thermostat - room temperature control

You could almost go so far as to say that the unofficial fifth main component of a refrigeration system - aside from the compressor, throttling device, condenser and evaporator - is the thermostat. This is because even with the simplest compressor refrigeration systems, such as a household refrigerator, a thermostat is always used to control the temperature inside the refrigerator. In this case, the thermostat either switches the compressor on and off directly or switches a contactor or relay.

In this case, the thermostat either switches the compressor on and off directly or switches a contactor or relay. As an alternative, the solenoid valve can be switched directly if pump-down or pump-out circuits are used. This arrangement can be used to avoid a high contact load, such as would result if the compressor load were switched directly by the thermostat. If it is not desired to fit a solenoid valve in the liquid line of the system, it is naturally not possible to use this circuit option. 

Using a thermostat to control the room temperature assumes that the system is a type where the evaporator chills the air.