Quote:
Originally Posted by Chief Roundup
Just to verify for you. You CANNOT use a 410a coil with a R-22 condenser/compressor. The bulb that the TXV, expansion valve, uses to control how much refrigerant the valve lets by is charged with 410a refrigerant. That bulb will either allow too much refrigerant by or not enough. The bulb is strapped to the copper lines in the coil. It is suppose to sense the temperature of the refrigerant flowing through the coil and open the valve the proper amount. Those temperatues need to be the same for the valve to operate correctly. Those temperatures will not be the same if you put 2 different refrigerants together. This will prohibit the unit from working correctly and cost them even more money.
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Yup I know you can't mix and match within the closed system. I was just typing the condenser when I meant compressor earlier and causing all sorts of confusion.
Their CORE dilemma (besides just trying to find the best most price effective solution) is that the air handler was likely installed during their last big kitchen remodel and now it doesn't appear there will be any way to replace the giant ass unit without some pretty big tearing up of things. In the end I think they are going to have to either A)just replace the a-coil and stick with R-22 for now and hope they are ready for another giant remodel when it comes time to replace everything or B)replace the a-coil and the heat pump outside to match to anew R410 system OR C) I just talked to my only buddy in Austin who is a big HVAC guy and he said given the screwed up situation what he would do is get a new slimmer air handler that would fit through the access panel and just cut the old on up in place to remove it and then upgrade the whole system to R410