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Heat pump with High head pressure

Head pressure exceeds maximum rating (550) 575+ on liquid line. Runs well in cool mode.But not in heat mode. Heat mode : 110 true suction. od temp=50 liquid line temp= 93 Compressor is drawing 13.7 amps.(RLA is 14.1) Air flow is good in and out. unit is about 18 months old and is matched. coils are clean in and out. Ran with return duct removed to eliminate any return air issues.(no change) Suspected outdoor txv. Got a second opinion. I replaced the condensing unit with my spare unit. (same model , figured I would replace txv at the shop and not have to stand on my head!) The new condensing unit performed exactly like the old one. This doesn't leave much but the txv in the air handler. What am I missing?

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HFC-134a ? Critical pressure is 588.9 a . With a 93 LL temp and 575 head, I would suspect 1. Air in system or 2. Ref. has gone critical.
With a 110 psig suction/85 deg.F and a LL temp of 93 deg.F/125 psig

Posted on Jan 14, 2013


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Posted on Jan 02, 2017

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SOURCE: Air flow indoors good.I cleaned condenser, found


Posted on Dec 08, 2009

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SOURCE: high suction press (98psi), normal head press

lower fan speed.....and double check head pressure, sounds very low!!! should be around 250-275.....also make sure the return air grill is large enough.

Posted on Aug 10, 2010

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It is very hard to charge a heat pump in the heating mode. The pressures are low. It also depends on the outside ambient temp. If you can turn to cooling if inside temp is above 70 degrees. Take a piece of plastic and block condensor till you get your head pressure to about 235. Not discharge temp but liquid pressure near service valve. You do not have a TXV inside I believe. Get your suction pressure up a little more It is not to low on gas. If you have temp meter attatch a lead to suction line. Temo\p should be about 10 to 14 degrees difference Between suction temp and Temp on your suction gauge. If you need a charging chart I can fax you one. Rus

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