Originally Posted by lions paw
Then the first plate (the one with the capillary tube refused to frost up and went to box temp.. I assumed that I had too much Freon and over a couple of day reduce the charge until I was down to 2 psi and the second plate would not freeze.
Some plates are designed with an inbuilt passive bypass. i.e. there'll be a very small diameter cavity that runs from the inlet to the outlet. Most of the time the majority of the coolant
will evaporate throughout the main bore of the system. In the event that the main bore becomes blocked, or restricted etc. (due to internal corrosion
or foreign particles), then the Freon will bypass most of the plate and transfer to the outlet at a much lower rate.
This may explain why your second plate still works (down to a low pressure) but the first plate in series has stopped functioning. If this is the case then you're unlikely to notice any change in the performance of the compressor, as the blockage would only have affected the
If you have a vacuum and Freon charging
system available (sounds like it). You could consider removing the blocked plate from the system to see how well the second (functioning) plate works. Alternatively, you could remove the functioning plate and confirm that the first plate is blocked.