I have a Carrier evap. coil model CK3BYA048021AAAA (sticker is very tiny and difficult to read, so not 100% sure on those numbers). 4 ton. Label says it operates on both R22 and R410a. Ran it 20 years with R22 and 4 ton condenser, no problem. Compressor just wore out so I had contractor install a 3.5 ton Rheem condenser using R410. He flushed the lines with cleaner, then nitrogen. No leaks. Added about 5 lbs. refrigerant, all pressures looked good, so he packed up and left. I thought job was done, but a couple hours later it seemed to no cool any more. Condenser fan runs, and compressor seems to kick on. Contractor returned and installed new contactor, didn't help. The suction line is NOT getting cold. Could there be lack of freon? The evap coli does not have a txv valve, but instead maybe uses an orifice. Another HVAC contractor told me when changing from a 4 ton to 3.5 ton condenser, the orifice should have been changed to a 0.74, but the installing contractor didn't think that was necessary, that it should work fine with the new condenser.
Would appreciate any ideas on what's causing this lack of cooling!
Thank you
Would appreciate any ideas on what's causing this lack of cooling!
Thank you
source https://hvac-talk.com/vbb/threads/2241673-New-condenser-insttalled-but-not-cooling-Help-please!?goto=newpost
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