Heat Pump R410A Pressures - HVAC - DIY Chatroom Home Improvement Forum

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Old 03-21-2012, 04:18 AM   #1
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Heat pump R410A pressures

I am an old school HVAC tech. trained in R-12 and 22. I have two new Goodman systems installed by 'Who knows?' Systems were installed before cient bought forclosed home. All the low voltage wiring was a disaster. (Obviously done by someone who didnot know what they were doing). One system is R-22 and the other is R-410A. The 410 A system is not operating properly. I put guages on it (the new type for 410A) and the pressueres read 35psi on the low side and 100psi on the high side. Suction line is sweating. Is this anywhere near normal? I thought 410 systems ran higher pressures than 22. I have no temperature drop across inside coil, any suggestions.


Last edited by lgmbroker8; 03-21-2012 at 05:14 AM.
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Old 03-21-2012, 06:23 AM   #2
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100 head= 37 degree saturation temp
35 suction = a negative 11 saturation temp

Can't have sweat at 11 below zero F so my guess is it's not 410A in there. Kind of looks like pressure readings for 134a. Reclaim,leak check,vacuum to 500 microns then charge with fresh 410A.


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Old 03-21-2012, 07:41 AM   #3
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Looks like you are out of gas, follow marty's advice and recover, pressure test, and repair then recharge system using subcooling method.
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