Air Conditioning - 4 ton unit is iceing at the return

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daniel55
07-09-06, 12:41 PM
What should the pressures be at the return and on the high side of a 4-ton unit? Currently mine are 225 high side and 50 something on the return. Is this what is causing the return to freeze?

mdtaylor
07-09-06, 01:45 PM
Yes, you need to call a pro to check out your unit for leaks, repair as necessary, and charge to specs.
Ed Imeduc
07-09-06, 09:50 PM
If your EPA you would know what the psi should be. If your not you shouldnt put the gauges on a unit. You could contaminate the unit and let in noncondensables and that will screw up the unit. Best is at outdoor unit big copper line cold and wet small line warm .

ED;)