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#41 | |
Tech./Sales Consultant
Trade: H-VAC Consulting
Join Date: Jun 2009
Location: Lancaster County, PA
Posts: 609
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![]() Re: high head pressure low suctionQuote:
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#42 |
Semi electrician
Trade: HVAC tech
Join Date: Jun 2009
Location: New Jersey
Posts: 250
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![]() Re: high head pressure low suction |
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#43 |
Member
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![]() Re: high head pressure low suction
Wow, 3 pages and the original question was never really answered, Or was it? Where the hell is TC and did he get the answer he was looking for?
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#44 | |
Junior Member
Trade: Florida State Certified A/C Contractor CAC1816055
Join Date: Jul 2009
Location: Plant City, Florida
Posts: 15
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![]() Re: high head pressure low suctionQuote:
I will see if I can dig one up and take a picture of it. |
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#45 |
Tech./Sales Consultant
Trade: H-VAC Consulting
Join Date: Jun 2009
Location: Lancaster County, PA
Posts: 609
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![]() Re: high head pressure low suction
So it is a bypass only for a fixed orifice rather then for a TXV. That makes more sense. Must have been between fixed metering using cap tubes and sliding pistons that allow full bypass when slid in one direction.
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#46 |
Junior Member
Trade: Residential
Join Date: Jul 2009
Posts: 3
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![]() Re: high head pressure low suction
I think bwalley is correct. 3 things will cause high head pressure; poor air flow across condenser, overcharge, or non condensable in system. Recover charge, check system for leaks, pull vacuum, and weigh in new charge.
Last edited by Peal; 07-12-2009 at 08:54 PM. |
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#47 |
Member
Trade: Residential,light commericial hvac +
Join Date: Apr 2009
Location: Saginaw, MI.
Posts: 57
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![]() Re: high head pressure low suction
too small a piston, too much airflow over evap coil, restriction in liquid line (filter/drier) condensor way below coil, condensor under a deck, condensor located in very hot envoiroment, there is alot more then three!
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#48 |
Junior Member
Trade: Residential
Join Date: Jul 2009
Posts: 3
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![]() Re: high head pressure low suction
Scooter:
too small a piston, restriction in liquid line (filter/drier) Ever put a unit into pump down. This is compete blockage of the liquid line. During pump down, no high discharge pressure. Besides if there is a partial restriction, the suction pressure will be low because the evaporator is being starved. Low suction pressure, low discharge pressure because of restriction. Unless overcharge, poor air flow across condenser, or non condensable in system. scooter condensor located in very hot envoiroment Are you talking about the unit having a higher discharge head pressure on a hot day compared to a cooler day? Sure, on hotter days the discharge pressure will be higher. But this is not abnormally high head pressures. These are normal head pressures associated with hot days. If the pressures are higher then the normal hot day pressures, then it is because of poor air flow across condenser, overcharge, or non condensable in system. Scooter: condensor under a deck Poor air flow across the condenser. scooter: too much airflow over evap coil I agree that the discharge pressure will be higher, along with a higher suction pressure. But tcbaker72’s opening statement was, “high head pressure low suction” |
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#49 |
Member
Trade: Residential,light commericial hvac +
Join Date: Apr 2009
Location: Saginaw, MI.
Posts: 57
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![]() Re: high head pressure low suction
TC is MIA
I am mearly trying to point out that all to often tunnel vision sets in and that there are no two systems that can be repaired with a cookie cutter repair. you are obviously convinced that there are non-condensables in the system, great, good advice, my point is that there are never X number of answers in such a dynamic industry. what if the furnace/air handler fan is quiting, due to a relay or open winding, what if the blower wheel is so filthy or has a shoping bag stuck in it that its capacity is 1/2 what it should be. Unless TC answers these questions and any more that you throw his way then we are all just peeing in the wind without being able to see the system first hand. Sorry if I stuck a burr under your saddleblanket. Scooter |
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#50 | |
Junior Member
Trade: Residential
Join Date: Jul 2009
Posts: 3
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![]() Re: high head pressure low suction
If my replay was callused, I am sorry.
Quote:
This is what tcbaker72 said: You are correct; there should be more information to make a better judgment call, but based on what he reported, I will stick with non condensables for now. |
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#51 | |
Junior Member
Trade: Air Conditioning/
Join Date: Aug 2011
Posts: 2
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![]() Re: high head pressure low suctionQuote:
If you add freon and the head pressure goes up but, not the suction...ou more than likely have a bad txv |
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#52 |
Junior Member
Trade: residential hvac repair and component upgrade
Join Date: Sep 2011
Posts: 4
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![]() Re: high head pressure low suction
Also a semi-stuck reversing valve can restrict refr flow and to the previous poster that said that the refr is only metered in 1 direction would be a new 1 to me as I live and work in Phoenix where the heat pump is king and I've never seen a heat pump that was'nt metered both in cool and heat mode between evap and cond . Oops , I just noticed this is an old thread ,,,,,,
Last edited by chrisfrost; 09-28-2011 at 07:26 AM. Reason: noticed old post |
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#53 |
Junior Member
Trade: Hvac
Join Date: Jul 2012
Posts: 11
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![]() Re: high head pressure low suction
Sounds like the txv is bad
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#54 |
Junior Member
Trade: AC Contractor
Join Date: Nov 2012
Location: Florida
Posts: 1
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![]() Re: high head pressure low suction
I have an AmerStd with an accumulator. Works well in cooling but head goes straight up in heat. Low suction and I assume non cons but was wondering about the sizes of the new condensing coils vs evaporate coils?
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