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Old 09-06-16, 12:22 PM   #43
jeff5may
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I can't really see any good pics of your indoor coil. What is usually done to accomplish even flow is simple. The manufacturers put some sort of restriction in each branch of the circuit. The more modern units have a distributor in them, which works just like a shower head. Older stuff has cap tubes of equal length feeding branches. Post #32 shows that the A-coil had this on it at one time, but I can't tell how it got modded when the TXV went in.

The main goal here is to have a constant pressure drop between the TXV outlet and the beginning of each branch of the split flow through your evaporator. It doesn't take much pressure drop to create a self-equalizing set of branches. The pressure drop will throw off your TXV, though, if it is more than a couple of PSI. In this case, you want to use an externally equalized TXV. The equalizer pipe taps into the discharge side of the evaporator so the power head can sense the pressure drop directly.

If your TXV is internally equalized (no equalizer line), and you don't have lots of pressure drop in the distribution piping, you can simply adjust the valve for proper superheat. Less spring pressure (looser) will reduce your superheat and vice versa.

Last edited by jeff5may; 09-06-16 at 10:08 PM.. Reason: details
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