For residential and light commercial users, an electric utility company supplies single-phase or three-phase power to users at voltages from 115 volts to 460 volts.…
Troubleshooting electrical problems in HVAC equipment may appear complex. However, electrical troubleshooting can be simplified if the unit’s electrical components are divided into functional groupings…
Purpose – This procedure describes the input voltage measurements commonly made when installing and/or servicing single-phase and three-phase powered HVAC equipment. Measurement o f the…
Removing oil from a compressor with only an oil fill plug is performed using the following general guidelines: 1. If possible, run the compressor fully…
Removing oil from a compressor with a drain plug is performed using the following general guidelines: 1. If possible, run the compressor fully loaded. Then…
The closed system method uses the refrigeration oil pump to charge oil into the compressor crankcase. The closed system method is performed on an operating…
When adding oil to a compressor, there is a danger of introducing contaminants into the refrigeration system. This can be prevented by adding oil to…
Purpose — It is important to maintain the proper oil level in the compressor to ensure proper lubrication. This is necessary to avoid possible mechanical…
Oil acid test kits (Figure SP-5-2) require that an oil sample be taken from the system. The test is performed following the specific instructions supplied…