HVACR: How To Install/Replace A Refrigerator Thermostat (Temperature Controller Installation) Wiring
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2 سال پیش
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HVACR (Heating, Ventilation, Air Conditioning/Refrigeration)
HVACR (Heating, Ventilation, Air Conditioning/Refrigeration) How To Replace A Refrigerator Thermostat/How To Install A Refrigeration Thermostat Temperature Controller/ How To Check A Commercial Refrigeration Thermostat With A Multimeter (How To Check Voltage/Resistance For Refrigeration Applications) Refrigerator Troubleshooting Guide/Penn by Johnson Temperature Controllers Refrigerator/Freezer Thermostat/Penn A19 Series Temperature Control A19ABA-40C/PENN A421 Refrigerator Thermostat/How To Check Penn Refrigeration Thermostat/How To Check Johnson Controls Temperature Control/PENN A19//Remote Bulb Temperature Control/Refrigeration Line Voltage Mechanical Thermostat Test/How To Check A Refrigerator Mechanical Thermostat With A Multimeter/How To Install A Refrigerator Thermostat/Step By Step/Training
Thermostats are typically found inside the refrigerator and have a knob that allows users to adjust the temperature setting. Once a user sets the desired temperature, the thermostat maintains that temperature by controlling the flow of electricity to the compressor. If the thermostat is the brain, the compressor is the heart of the operation, responsible for pumping the refrigerant through the coils.
When the air inside the refrigerator is at the desired temperature, the thermostat stops the flow of electricity to the compressor. When the thermostat senses too much heat, it allows electricity to flow, activating the compressor.
In most commercial refrigerators, the thermostat has a capillary tube filled with gas. As the temperature in the fridge increases, the gas expands and pushes on a diaphragm, which operates a set of contacts which in turn operates the compressor.
Johnson Controls A19 Series temperature controls are designed to cover a broad range of uses for heating and general purpose requirements. Controls have SPST contacts which open on temperature increase or they may be supplied in single-pole, double-throw contact action. Various control ranges are available to cover working temperatures from -30 to 550° F (-34 to 288° C). Closed tank fittings and bulb wells are available for immersion applications. These controls are designed for open low and open high applications. Where critical or high value products are to be maintained within a specific temperature differential, a single control should not be applied to function as both an open low and open high control. In these applications, a separate backup control with alarm contacts should be wired to indicate when the back-up control operates.
2 سال پیش
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