CCH in pumpdown system.

[wannafreeze]

I helped a friend of mine this weekend to put a walk-in cooler together.From supplyhouse they gave him a crankcase heater among other stuff.Its a pumpdown sytem.I wired the t-stat to control the LLSV.And LPC to pumpdown.I try to convince him that we don`t need to install the CCH.What say you?

[gerryboy00]

use it

[hvacbear]

You need it

[wannafreeze]

Originally posted by hvacbear
You need it

If CCH is needed to keep the R22 out of oil during of cycle,the LPC is gonna ensure it anyway.So tell me why you think I need it?

[dorrmann]

In low temps, it also keeps the oil warm and "oily." Sorry, I forgot the term.

It's the same thing as a block heater for a truck.

[wannafreeze]

Originally posted by dorrmann
In low temps, it also keeps the oil warm and "oily." Sorry, I forgot the term.

It's the same thing as a block heater for a truck.

viscosity?

[hvacbear]

Yes viscosity, some refrigerant will become entrained in the oil and the heat will drive it out. Also solenoid valve fail so a crankcase heater is a little insurance.

[sonc]

In a perfect world , compressor valves don't leak, solenoids don't leak, customers don't shut off breakers by mistake.

Sure, a continuous pumpdown system controls liquid migration on the off-cycle, but it doesn't mean chuck the cch. It's cheap insurance as bear mentioned