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6 Posts
During a recent checkup, my mom's Lennox 10 SEER HS29-261-2P 2 ton with Armstrong CAU24-1 indoor coil has developed a leak after 13 years of perfect service.
I confirmed very low refigerant with low psi on both high and low sides. As I recall the low side was 0 and high 60.
I've charged to 200 PSI nitrogen pulled back the insulation and checked every joint with bubbling solution including the schrader valves. I've been unable to check most of indoor coil and get inside the outdoor unit to check the compressor. I left the gauges on and after 3 days now see at least a 10-15 PSI loss.
Unfortunately I'm not the most experienced in finding leaks, but this is looking like a very difficult leak to find.
My next thought is to evacuate, fill with small amount of r-22 and check with a leak detector, but given I've lost so little nitrogen, I'm not so sure this will pan out. Alternatively, I've also been told I could safely charge to 300 PSI since the coils are factory tested to 350.
What would you try next? Any thoughts or suggestions are welcome.
I confirmed very low refigerant with low psi on both high and low sides. As I recall the low side was 0 and high 60.
I've charged to 200 PSI nitrogen pulled back the insulation and checked every joint with bubbling solution including the schrader valves. I've been unable to check most of indoor coil and get inside the outdoor unit to check the compressor. I left the gauges on and after 3 days now see at least a 10-15 PSI loss.
Unfortunately I'm not the most experienced in finding leaks, but this is looking like a very difficult leak to find.
My next thought is to evacuate, fill with small amount of r-22 and check with a leak detector, but given I've lost so little nitrogen, I'm not so sure this will pan out. Alternatively, I've also been told I could safely charge to 300 PSI since the coils are factory tested to 350.
What would you try next? Any thoughts or suggestions are welcome.