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Calling all AC technicians. Are low pressures the only way to determine Refrigerant?
I charged my 2.5 ton system with 12 oz in May, 1lb 12oz in Sept and 1 lb 2 days ago.
I found A leak with a leak detector in the suction line service valve. It was not tightened down enough.
The pressures now with a 75 degree ambient are 55 and 200 psig and so the Evap is freezing up
The wetbulb is 64-66.
+ so, I don't want to overcharge it since I've put in 3 lbs and 8oz already and it holds 4.5 lbs with a 25 foot + lineset.
So I want to know if I can count on the L and H pressure readings telling me that the system is still low and needs more refrigerant.
Thanks.
epa liscenced universal
Well, just found a leak at the condenser where the suction line is brazed to the access valve. And the LL valve cap was loose.
And, my hoses leak like crazy. \
Got some new ones and will try charging again.
I didn't figure on bad gauages and leaky service caps, not the service ports. Ports were ok. It is holding now at 73 suction; 260 liquid, 85-90 ambient. Added 12 oz.
Amazing how almost the whole charge could leak out since May.
It was vibration that loosened the caps.
I panicked because I thought of everything but that.
1 Answer
- mannyLv 58 years agoFavorite Answer
I'm not an expert, but I was told to compare the air as it leaves the vent with the air in the room. The difference should be 18 degrees or somewhat lower. It works for me.
