Originally Posted by
myhvacx
Yesterday I serviced a dual stage R22, 200k btu Rooftop Rheem Unit Model # RRCF-201CK
It had very low coil temperature, around 30f, the lines were freezing up and both compressors were working fine.
I pumped 10lbs of R22 into it but saw no changes, the txv valves are working as far as I can tell, I am hesitant to put in more refrigerant, not sure on this one..
Any ideas?
Without some vital signs on this system it is going to be tough for anyone to give advice.
The only thing I can tell you from what you posted is that you added about 25 % of the total charge.
Can you post pressures, SH/SC , airflow, air temps ect. All the typical troubleshooting info.
Instead of learning the tricks of the trade, learn the trade.