Determine the following data: (They can be found on the unit nameplate). 1. Btu or tonnage rating of the unit 2. System refrigerant 3. Evaporator…

These are also referred to as constant-pressure or pressure-reducer valves (see fig. 108). Because of their versatility, these valves are produced in a variety of…

Figures 107, 107a, and 111 show a solid-state type of TEV. This type of valve can be used on any system. Unlike the bulb-type TEV,…

A STARVED EVAPORATOR WITH AN UNEVEN FROST PATTERN resulting in poor cabinet refrigeration may be due to the following: 1. Loss of refrigerant from the…

Step A. Determine the suction pressure at the evaporator outlet with an accurate gauge. If there is no gauge connection, a tee installed in the…

1. 10°F to 12°F: Superheat for high-temperature evaporators. (30°F+ evaporators.) 2. 5°F to 10°F: Superheat for medium-temperature evaporators. (0°F to 30°F evaporators.) 3. 2°F to…

It is installed on the inlet of the evaporator with a sensing bulb connected to the valve body by a capillary tube and mounted on…

Reversing valves are used in heat pumps. It is a four-port solenoid valve with one port connected to the compressor suction tube, one port to…

Commercial refrigeration units are equipped with permanent service (access) valves, which make the service technician’s job much easier. With these valves already in place, installation…

The discharge of refrigerant from the compressor causes some small amount of compressor oil to be circulated with it. In heavier commercial units, the amount…