■ Use ohmmeter first to check unit continuity ground. In checking for a ground in either section, power supply disconnects should be open. This prevents…
Category: Refrigerator Troubleshooting
■ Turn unit off immediately so it can defrost. Insufficent air passing through evaporator coil—Check for restriction, dirty evaporator coil, or filter. ■ After the…
Modern service manifolds incorporate additional hand valves, connections for a vacuum pump, and a liquid-indicating sight glass. Some feature Schraeder valves in addition to the…
The first thing you must establish in changing a compressor was the nature of the failure. Of course if it was a mechanical problem such…
This can present a problem due to the automatic reset controls found on most residential and light commercial units. During a malfunction, a control opens…
There are times when everything appears to be operating according to all specifications, yet, insufficient cooling is the complaint. Heat strips energizing with cooling-Check the…
■ Check condensing unit to see if it is operating. Place one hand on the liquid line and the other on suction line. If the…
Earthing The motor frame must always be connected to the local earth circuit. It is most important to ensure that the flexible earthing strip between…
Figure 115 typifies a portable refrigerant recovery unit now in use within the refrigeration industry. The compressor is an open reciprocating type, driven by a…
It is a well known fact that an engineer required to work on an ammonia system will be very careful not to allow undue discharges…