crankcase heater

[billdozza]

running 5 ton r-22 scroll compressor in low ambient conditions, I have a low ambient fan controller on unit, Should I also install a crankcase heater on a scroll compressor.

[Grizzly]

It often Helps. And certainly will not do any harm.
Grizzly

[chemi-cool]

If the system doe's not pump down, crankcase heater is vital when compressor is at rest.

[old gas bottle]

yes,the fan speed controller will not help much when its the off cycle, fit one and depending on how low the ambient is i would be tempted to have it on perminently.

[powell]

If it's a Copeland scroll they recommend cchtrs based on voltage and the system charge. Here's a link to their bulletins. A good place to start is bulletin 4-1312, near the end there is a chart based on charge.

As the others have said, put one on, it want do any harm.

http://www.hvacrinfo.com/ae_index.htm

[billdozza]

thanks for the replies guys, u r the coolest