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JackAttack
19-05-2014, 05:09 AM
It's a 69NT40-541-302 running 1 or maybe 2 degrees of differential on supply/return. Won't cool below 45F here in the high desert. It got a new Controller, "Micro-Link P/N 12-00579-00 or approved equal" before I saw it and fired it up. Ran okay--Except for Alarm 67--but we don't control humidity anyhow, so I ignored it. It ran good for a few months, then cooling petered out.
Checked the usual--cleaned both evap and cond coils, fans run hard, changed filter drier and put in correct 8.75 pound charge of 134a. It pulls 8-9 amps per leg and suction of zero to -10 inches. Discharge runs 110 to 195 as condenser fan cuts in and out. So what red flag am I missing here?

mikeref
19-05-2014, 07:53 AM
Sounds like the expansion valve isn't feeding. Low side pressure should be around 22 psi.

wicky
12-11-2014, 09:53 AM
Checked the usual--cleaned both evap and cond coils, fans run hard, changed filter drier and put in correct 8.75 pound charge of 134a. It pulls 8-9 amps per leg and suction of zero to -10 inches. Discharge runs 110 to 195 as condenser fan cuts in and out. So what red flag am I missing here?


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