This article explores how a restricted metering device will affect system performance and efficiency. The system is a commercial refrigeration system with a thermostatic expansion valve (TXV) as the metering device.
Many refrigeration compressors incorporate a suction service valve and a discharge service valve. Working with these valves is not difficult, but there are some finer points to remember.
A common cause of premature reciprocating compressor failure is overheating. A recip that is running too hot will surely fail before its time. A service tech should always look for this potential problem while servicing any refrigeration system.
A simple ohmmeter is all that is needed to troubleshoot a potential relay. After taking all of the connecting wires off of the potential relay, measure the resistance across the 1 and 2 terminals.
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