low suction high head press. - http://www.hvacmechanic.com/ Forums
Original message
| Hotshot
 |  "low suction high head press."
, posted Sat 2 Aug 22:23  
48lb suction 340lb head. Clean coils evap and cond. Indoor was iced up. sitting at max amps. 10 deg split, 80deg indoor temp. Any ideas
From sin city
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Replies:
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| amech
| "Re(1):low suction high head press." , posted Sun 3 Aug 08:31
Need more information, Superheat and subcooling, O/A Temp, R/A & D/A temps, Indoor termp, ETC. With 110-120 outdoor entering temp, head pressure not out of line. Restriction is likely your problem. May be in the drier or metering device. Dirty filter, blocked Return. Is your blower plugged or even running at desired speed.
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| mississippi
| "Re(1):low suction high head press." , posted Sun 3 Aug 01:07
restricted piston or txv or piston to small
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| Jojo98
| "Re(1):low suction high head press." , posted Sat 2 Aug 22:33
Low on charge with that kind of head press?
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| pbreazeale
| "Re(1):low suction high head press." , posted Sat 2 Aug 22:25
Low freon.
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| | Hotshot
| "Re(2):low suction high head press." , posted Sat 2 Aug 22:33:
No room for more gas, Compress amps at max plus 5%
From sin city
[this message was edited by Hotshot on Sat 2 Aug 22:41] |
| | Freon
| "Re(3):low suction high head press." , posted Sun 3 Aug 13:10
Please post some history... age?, new problem? Any work done where system was opened? Make/model.
It would appear the evap coil is starved so you'd expect high superheat. If there was a restriction then also high subcooling. Check the lineset for any damage from other people working around.
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