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View Full Version : r22 used in r407c rooftop unit.


just joe
18-07-2008, 02:41 PM
I have a rooftop unit that was accidentally filled with R22. It is labeled R407c, unit now will not work, what needs to be done to get the R22 out and back to R407c?
chemi-cool
18-07-2008, 02:50 PM
You do not need to take it out, it will work now better,
Not starting has nothing to do with the type of gas.
NoNickName
18-07-2008, 03:57 PM
At least remove the c o cktail and fill it up with just R22, if you prefer that. Nothing else. POE oil is compatible with R22.
just joe
18-07-2008, 05:04 PM
Unit has two compressors one tested w/R407C works , the one now w/ R22 runs but high presser line very hot compared to the R407c and the return line is warm. The air in duct is 75 f.
powell
18-07-2008, 05:33 PM
Unit has two compressors one tested w/R407C works , the one now w/ R22 runs but high presser line very hot compared to the R407c and the return line is warm. The air in duct is 75 f.

joe,

Why was the unit serviced*?

It could just be having the same symptons it had before it was serviced*.

*(commissioned for you UK gents)
NoNickName
18-07-2008, 06:18 PM
Unit has two compressors one tested w/R407C works , the one now w/ R22 runs but high presser line very hot compared to the R407c and the return line is warm. The air in duct is 75 f.


TXV probably need adjustment, as the bulb is selected for R407c and not R22.
Brian_UK
18-07-2008, 07:21 PM
Does the system have both gases in it, R22 and R407C, ??
johnanthonyhome
18-07-2008, 10:20 PM
TXV probably need adjustment, as the bulb is selected for R407c and not R22.- Exactly, If half the evap coil is cold, its starved, go two turns counter clockwise. Adjust from there. If evap coil, and suction line are all same temp back all the way to the compressor, this would be a flooded condition- tighten the txv adjuster clockwise two turns. But none of this will matter unless there is a usable charge of 22 in the system-not over or under charged capice?
just joe
21-07-2008, 01:02 PM
Leak. unit was pumped out and fixed pumped down and refilled w/r22
just joe
23-07-2008, 01:33 PM
Leak. unit was pumped out and fixed pumped down and refilled w/r22
just joe
23-07-2008, 01:34 PM
will poe oil work w/r22
just joe
23-07-2008, 01:35 PM
no only r22 but the poe oil was not changed