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My Unit blows very cold air and brings temp down 2 to 3 Deg when it drops below 30 deg. Why?

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  • Larry Deering Jan 11, 2013

    It's the heating part of my unit that I have a problem with and I have an outside heat pump.

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Needs more info, but sounds like the thermostat is fused, does it ever shut off on its own. TXV could need adjustment, or low charge. both of these have other side effects, the evaporator will ice up pretty fast, long run times. without seeing some thing like this there is no way to know.

Posted on Jan 09, 2013

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Posted on Jan 02, 2017

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SOURCE: Cools for a while ... keeps running but stops cooling.

If the refrigerant has been accurately charged and diagnosed, I would look for an air restriction. Check your filter first of all. It sounds like it may still be trying to freeze up. Make sure all the vents are at least a little open and the return grill is not blocked. In the Rocky mountain region we like to see around 44- 50 deg. at the vents. 65 would tell us that everything is not ok.

Posted on Jun 17, 2008

FurnaceGuy
  • 74 Answers

SOURCE: Central heat does not blow hot air, just warm air weakly

Sounds like some of the elements are not working. You being in Florida they may not have put very many elements in. It was 61 degrees last week. I know because I'm a Dolphin Fan. You will need a current sensing meter to check the elements.

Posted on Jan 04, 2010

Testimonial: "Perfect... The problem was with the Defrost control unit... apparently the outdoor unit was icing up every night, defrost control element was bad!"

roniecon
  • 6826 Answers

SOURCE: temp setting way off kenmore 580

Remove the window unit and dissasemble,and clean it out,careful not to bend the fins on the condense and evaporator,but clean them out,and the inside of the unit also,then see what happens,if the problem persist,then find the probe on the evaporator and move it away from the evaporator until the compressor stays on longer.

Posted on May 27, 2010

  • 117 Answers

SOURCE: low charge?

System is running a 24°F superheat and a 0°F subcooling at those readings. Saturation temperature is approx. 30°F lower than return air temperature.

Indications are of a low system charge. Ensure all your filters are clean and there are no obstructions that are limited airflow across the evaporator coil. Ensure the coils are clean and not frozen up.

Have it checked out. Looks like a low charge but can't tell without being in front of it. As far as normal ranges, that all depends on many factors. Based upon the info you have supplied, I would guesstimate that the operating pressures would be in the neighborhood of 350/160 to start and get the subcooling and superheat in check.

Posted on Aug 01, 2010

  • 73 Answers

SOURCE: AMCOR UCHW-H24CF2 Problem. Inside unit: in clean

The E-4 message indicates low on refrigerant (R-410A type) You will need guage hose adapters sold by Ritchie/Yellow Jacket # 19173
Pridiom Group 201-266-8234 option2
Support@Pridiom.com

Posted on Jan 04, 2011

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My name is Peter. I am a retired field service refrigeration technician.

The normal range for a freezer is -2 to +2 Deg. F.

The normal range for the fresh food section is 35 to 40 Deg. F.

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The unit has a leak and is low on charge (freon) Find and fix leak, then vacuum and recharge...Leak is probably in flare fittings behind unit...
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Find a reputable HVAC contractor to do a room by room analysis with heat and cooling loads calculated and units sized and duct requirements and compare to what you have.

The air not being cold is not necessarily an indicator of anything malfunctioning. High efficiency units for instance don't produce cold air.

Since you have had someone look at it, the duct work may be collapsed which restricts air flow or uninsulated which warms up the supply air. Either one is a possibility. Any Cox Cable guys been stompin' around your attic lately? Wouldn't be the first time.

Usually, when the air coming out of the vents is not cold enuf it's because your freon level is low. Probably leaking, but they can usually recharge the freon and it will work for a while. Try another repair company and see if they can recheck the freon level.

We have a high efficiency unit and it produces cold air, so I don't know what previous poster is referring to. Air conditioners are supposed to blow cold air.

Sorry, to tell ya but it is normal if the outdoor temperatures are much below 45 degrees. Below 45 degrees there is little heat outdoors for the heat pump to grab to heat the home so it will run 24/7 and blow cool or cold air. Below 45 the temp of the air coming out the vent will decline and you will get no heat from the heat pump itself as you near freezing.

Your emergency heat or auxiliary heat is electric strip heat. But it only kicks in during normal operation if the temp in the house drops 3 degrees below the setting. (some tstats if can be 5 deg.) Otherwise the heat pump will blow cool or cold air the rest of the time if it is too cold out.

To prevent it from running all the time and blowing cold it is recommended if the temp outside is falling below 45 degrees you should just switch to the emergency heat setting, which shuts the pump outdoors off, and just heat with the electric.

But if there is no heat outside the heat pumps will blow cold. They are the cheapest and most efficient forms of heat but only as long as the outdoor temp is above that 45 deg..

I'm guessing that if you haven't experienced this you live in some place with moderate winter temperatures like in Northern Florida and rarely get very cold winter temps like the freezing you have seen there recently.

It will likely blow much warmer when the outdoor temp rises.


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