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Behind The Refrigeration Pressure Switch The pressure switch is best known as a type of switch that's known to close a certain electrical contact when it detect certain pressures through its internal input system.

The pressure switch

Many pressure switches are designed to make contact as soon as the pressure within a certain device or appliance rises or if the pressure within those devices or appliances fall.

Besides detecting electrical impulses, a pressure switch can also be used to detect mechanical forces in action. The best example to describe that type of pressure switch involves a pressure sensitive mat, which is usually used to automatically open doors found within commercial buildings.

The mechanics of a mechanical switch mainly involve the contacts, since the switch coming into 'contact' with its contacts often causes the switch to perform its intrinsic function: shutting off an appliance or device when it reaches a certain pressure threshold.

The contacts associated with most switches after often rated around a couple of tenths of an ampere to about 15 amperes, depending on the device or machine. Smaller rating are often associated with smaller switches; also, many switches are known to operate a certain relay or other type of control-centric device. Other types can directly control a smaller electric motor or other types of loads.

The refrigeration pressure switch

Many refrigerators contain a components that's known as the refrigeration pressure switch. This type of switch is mainly used to help maintain the pressure control system within a refrigerator.


In most cases, this pressure control system has everything to do with the refrigerator’s temperature control system.

The temperature control system of a refrigerator is usually known to be controlled with a low pressure control system, rather than a thermostat like most people would assume. This system works through cycling the compressor's operators in response to how the suction pressure (the pressure in general) responds in the refrigerator. As a result, it controls the temperature within a refrigerator; this control system is actually quite popular in smaller refrigerators.

Due to this control system, many refrigerators are known to use a refrigeration switch to employ low pressure control. Naturally, these refrigerator models include components that influence the performance of this pressure control system, which includes a thermostatic non-bleed expansion valve and an ambient located condensing unit. The ambient itself is known to be warmer than the appliance's highest operating temperature.

The process that produces the lower suction pressure happens when the evaporator temperature drops with the box temperature. When this process happens the suction pressure end up hitting the low pressure control unit and ultimately opens its associated contacts to stop the compressor from working.

When the temperature rises in both the box and the evaporator, the pressure increases, causing the contacts of the lower pressure unit to close and restart the compressor.

On an interesting note, the refrigeration pressure switch that works in a low pressure control system is said to have some advantages over other refrigerators that use a traditional control system. People interested in using an appliance with this type of temperature control system should always seek advice before making a purchase.


Behind the refrigeration pressure switch  

The pressure switch is best known as a type of switch that's known to close a certain electrical contact when it detect certain pressures th...

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