What is the purpose of the crankcase Lo heater?

What is the purpose of the crankcase Lo heater?

The crankcase heater is designed to help combat refrigerant migration. The function of the crankcase heater is to hold the oil in the compressor’s crankcase at a temperature higher than the coldest part of the system.

When should the crankcase heater be energized?

The crankcase heater should be energized for at least eight (8) hours before running the compressor. Crankcase heaters should be left energized for the rest of the season so that whenever the compressor is idle, the heater will prevent refrigerant “migration” to the crankcase.

Are crankcase heaters necessary?

By using a crankcase heater to bring all of the fluids up to operating temperature before starting, the compressor motor can start easier and pick up where it left off. Without the crankcase heater, these compressors would have to work a lot harder during startup, potentially causing excess wear on the parts.

How is a crankcase heater usually wired?

Wiring: Route one crankcase heater wire into control box and attach to quick-connect line voltage terminal 11 on contactor. Cut quick-connect off other crankcase heater wire, strip and connect to stripped temperature switch wire with a wire nut. Temperature switch must be exposed to ambient temperature.

Can crankcase heater trip breaker?

In my experience, crankcase heaters are over looked during preventative maintenance, finding failed or defective heaters can result in creating legitimate work. Also, if you are experiencing a situation with a tripped breaker, inspecting the crankcase heater is not a bad place to begin troubleshooting.

Where do you put a crankcase heater?

Installation. Some air conditioning equipment manufacturers install crankcase heaters either in the compressor (insertion type), or mount them externally around the base of the compressor (bellyband type).

What is crankcase heater in refrigeration?

Crankcase heaters are used to keep the compressor oil at an elevated temperature to ensure the refrigerant does not migrate and mix with the oil. Each heater is composed of a long thin electrical heater with a built-in adjustable strap that easily fits around the cylindrical housing of the crankcase.