Manifold Gauge Question - Heat Pumps - http://www.hvacmechanic.com/ Forums
Original message
| tbeyler
 |  "Manifold Gauge Question - Heat Pumps"
, posted Sat 20 Sep 16:42  
I was wondering - does the high pressure gauge on the manifold set always get hooked up to the high pressure line (small line) on a heat pump, and the low pressure gauge always get hooked to the suction line (big line) regardless of whether the heat pump is in cooling or heating mode? I know the flow of refrigerant reverses direction, but I assume the small line remains the high pressure line and the larger line remains the low pressure line? Thanks for the help.
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Replies:
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| TnNATE1412
| "Re(1):Manifold Gauge Question - Heat Pumps" , posted Sat 20 Sep 19:39
BOTH copper refrigerant lines on a heat pump become HIGH pressure during heating mode. There should be a low side port sticking out of the cabinet going straight to the compressor for use in heating mode. If you connect the low-side guage to the large line, it will blow the gauge due to the high pressure. The small line (liquid) will usually be only close to the same as the large line in heating.
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| | tbeyler
| "Re(2):Manifold Gauge Question - Heat Pumps" , posted Sun 21 Sep 07:20:
Thanks for the reply. I looked a little closer at my unit (Trane XE1200) and see what you mean. I actually have 4 gauge ports. There's one on the large line and one on the small line that runs to the air handler in the house, and then 2 on smaller lines - one of these comes off the single line on one side of the reversing valve, and the other comes off one of the 3 lines on the other side of the reversing valve. With this rough description, can you tell me which gauge to hook up where? Much appreciated.
[this message was edited by tbeyler on Sun 21 Sep 07:45] |
| | TnNATE1412
| "Re(3):Manifold Gauge Question - Heat Pumps" , posted Sun 21 Sep 17:45
The two capped fittings mounted through the equipment panel.... Top is High (Red), Bottom is Low (Blue).
NOT the copper lineset fittings going to the inside, just the ones sticking through the sheet metal of the cabinet.
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| | tbeyler
| "Re(4):Manifold Gauge Question - Heat Pumps" , posted Sun 21 Sep 17:51
Thanks TnNate - that's what I needed confirmation on. I'm at 190psi on the high side and 45psi on the low side - so undercharged according to the charts. I'll get somebody out here. Much appreciated again.
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| | aircooled
| "Re(3):Manifold Gauge Question - Heat Pumps" , posted Sun 21 Sep 15:24
It's marked on unit, try reading it.
Man if you don't know how to hook up gauges to heat pump you sure should not be working on them.
"People will forget what you said people will forget what you did but people will never forget how you made them feel."
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| | tbeyler
| "Re(4):Manifold Gauge Question - Heat Pumps" , posted Sun 21 Sep 17:49
Just trying to learn. I have the performance curves for the unit, but was a little unclear on what ports to use. I have no problem paying for something I'm not qualified to do, but like to know what the situation is before writing a check. Do you do your own automotive work (brakes, etc.)? Are you an SAE certified mechanic?
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