Quote:
Originally Posted by funola
Ok will do. Should it be in recirculation mode?
Low side was at 40 psi at 90 F the last time I added 134A (till the can ran out). When I add more (gotta get another can from Walmart), does the low side pressure go down?
I do have a set of manifold gauges from HF. I pressure tested it to make sure there are no leaks and studied all the valves and understand how they operate. The gauges on it are ok (not way off).
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the pressures CAN go down by adding refrigerant, but it's much more likely to go up. pressures are the result of:
.refrigerant boiling due to air flow across the evaporator
.refrigerant expanding through the TXV
.compressor pumping AND drawing on both sides of the TXV
.condenser removing heat from the HOT gas refrigerant causing it to liquify
.HEAT on all sides entering and expelling from the refrigerant.
if adding refrigerant lowers the pressures, it's due to the TXV reducing flow because the set amount of heat has been reached for the pressure passing through it.