Check the discharge (vapor) line, it should be 100˚ – 110˚ over the outdoor ambient temperature Indeed, Luke, if an A/C system has lost enough refrigerant that it is no longer cooling air then adding refrigerant to the system may get it "working" again. Fuji 12RLS3YH has “Nominal Heating Capacity” of 16,000 BTUs and max heat capacity of 22,100 BTUs. As the name suggests, a heat pump transfers or pumps heat from one place to another (notice the use of the word “pump”, heat is not generated, but rather is moved). Bill it sounds from your note as if your repair tech is either overloaded with work ( after it's all during very hotvweather) or is stumped .it's time to call someone else who will respond to you. Thermostat problems: First check to see that your thermostat is set to cool. Is there any way to adjust the settings to make "low" really "low"? At higher outdoor temperatures the system may not be able to produce the same cooling capacity. Mon: about typical air conditioning compressor run time, I don't think there is a single right answer to your question, because the on-cycle time depends on several variables that could in some cases leave the unit on for a long time, even continuously. While our air source heat pumps will operate down to -4°F (-20°C), the colder the outdoor air, the harder the heat pump will have to work to produce heat for your home. I won't go with the idea that the thermostat should be set in a way to avoid the compressor running continously because before the trouble begun the unit has been running almost continously for 8hours for the last several years and there was no occurance of ice/frost build-up. System efficiency begins to drop when temperatures drop below the low 40's, and eventually it's cold enough that backup heat or alternative heat sources are required. JD - 7/09/11. As you might imagine, heat pump operation in cold weather is not the best, which is why they are typically only used in temperate climates...think beaches, palm trees, and oranges. Sorry that's too broad a question to even understand where to begin. Any suggestions? I had a a guy come and install and new government supplied smart thermostat and the AC was not working so he could not do the install as per his rules. While the A/C is running the thermostat reads hotter? no it doesnt seem to cool good enough .. if its say 80 outside. is ... single stage ? Help please? - Mon 5/31/12. Or skip directly to AIR FLOW TOO WEAK at InspectApedia.com. I called him and told him it is still not working. He said he has all the info and would tell me about it. It started to around 2 to 3 coils then it gradually increases until almost the entire coils are covered with ice. Check all brazed joints and look for, or feel for oil on the surface. Sandy said:Does the blocked air ducts affect the reading of the return register and the supply register. We have no relationship with advertisers, products, or services discussed at this website. Heat pumps require less space. 2) Central or whole-house heat pump. For example R22, at 65 degF will stabilize at about 111 psi if memory serves. See AIR CONDITIONER TEMPERATURE MEASUREMENT to make sure you're measuring the A/C temperature drop correctly. PTACs are usually found in hotels/motels, where they do excellent job, but that is a topic for another article, so here we will not review them. Or see AIR CONDITIONER TEMPERATURE FAQs-2 - more questions & answers about HVACR temperatures & temperature measurement. Given that you are finding the system confusing, I can't recommend messing with the controls, wiring, refrigerant and instead I think it's well worth paying a trained HVAC tech to take a look. See RATED COOLING CAPACITYof air conditioning equipment if the system seems to be working but is inadequate to cool your building. In short, would 115psi on the suction line only be a problem when the system is operating but not when it's off? Both pressures dropped considerably so I added Freon. Heat pump, AC, Ventilation, some … For example, if your electric bill in the winter is $600, and you get a 3 COP heat pump, you will then be paying only about $200/month. But I have to so something as it is a one bedroom and my cooling bill is outrageous. Thanks! Thanks for the question, Donna, but I'm sorry - I don't really understand the situation that you describe. In hotter outdoor air the compressor/condenser has to work harder, and perhaps longer to condense the refirgerant back to a liquid. I'm not sure what temperature differential you ask about but certainly if two ducts have lost air flow that would mean that the areas served by those ducts won't be cooled. Compressor unit is Goodman and is 8 years old. Also, for larger systems (over 36K BTUs /3 Tons), Mitsubishi and also Daikin (not mentioned above) have more efficient systems than Fujitsu, and more options for 4+ zones. It has a coolant regulator which he placed. I'm wondering if the compressor has been damaged but would rather not replace it as a means of troubleshooting. (June 16, 2014) Anonymous said:To Carl: On an R-22 system you should get at least a 67psi reading on the low side (suction line). When it comes to heating, some heat pumps can be limited in their ability to provide sufficient heat in extra low ambient temperatures. So 85-92°F feels cold to new heat pump owners. I typically get the units I work on down to 59 degrees coming out of the air vent, s. The 16 degrees mentioned is what I consider bare minimum. When most A/C systems are off for some time, especially older residential designs, pressure equalizes throughout the system and will ultimately be the standard pressure for that refrigerant gas at the ambient temperature, with a little adjustment for altitude above sea level. Upon placing my gauges on the unit, I noticed the pressures were normal (75/210). Also see REVERSING VALVE on HEAT PUMPS, 30 June 2015 Rich said:outside temp 93F inside temp 78F, vent temp 43FThermostat set on 74F, will not cool down anymore.why. Changed out blower and coil. A heat pump is a great choice for Western Washington. Four our purposes we will look at most efficient units from Fujitsu and Mitsubishi (Fujitsu 12RLS3YH & Mitsubishi MZ-FH12NAH) in 12K BTU capacity , which is enough for 400-500 sq. I would say YES, with some limitations. But at an outside temperature of 15 degrees F, no one would expect the air conditioner to be operated - doing so risks damage. In cooling mode, ALL heat pumps are very efficient, and work from northern Canada all the way south to Central America. I replaced the batteries in the thermostat twice, I blow out with can air to clean dust, no change. We check the unit current and its ok, so we believe the charge is also ok. We check other possible causes, like distorted coils fins, dirt, obstructions and blower speed and they seem to be all ok. What do you think should i do more? I rent and I don't know what kind it is. But the efficiency of the system is affected by outdoor air temperature. Even though it was new maybe a deffective piece? Basically, Central Heat Pumps are only effective in warmer climates (Regions 3, 4 and 5 on the Climate Region Map above). Here we delve deeper into comparing the pros and cons, as well as costs of a. specific operating problems on central and portable or window air conditioners. - Stumped 10/19/12. Both of these heat pumps come in Low Heat packages, which allow them to produce heating in -15°F (-26°C) for Fujitsu and -13°F (-25°C) for Mitsubishi. old. so i was wondering if some home systems have a 2stage compresser high and low . Tyically a modern high efficiency heat pump can extract some heat from cold outdoor air down to the high 30's. If the area gets chilly during a severe cold snap, don't be afraid to turn up the old thermostat temporarily. So we will use low temps: As you can see from the table above, the lower are the outside temperatures, the lower is the capacity or amount of heat, which these heat pumps can provide. Could there be air in the system? For example, if a system has no crankcase heater installed, or even if it has one installed but the system has been left turned off, trying to run the compressor without sufficient time for the crankcase heater to work can damage or even destroy the compressor motor. Keep us posted on what you find - it will surely help other readers. That said, if it's too cold, low refrigerant pressure can cause problems. When the outdoor temp is 82F or higher the compressor runs normally. Thanks much, Carrie - 11/17/12. Our #1 Choice. cost and efficiency of a central air system (furnace) vs a ductless mini split (heat pump). - JD. The outside temp is apporx 15 degrees, would this have anything to do with it? Something that slows the air rate may cause a greater temperature drop - not always desirable, and vice versa.So if the weather or your home were hotter when you made the first measurement than when you made the second, that condition alone could explain the change that you saw. Something that slows the air rate may cause a greater temperature drop - not always desirable, and vice versa.So if the weather or your home were hotter when you made the first measurement than when you made the second, that condition alone could explain the change that you saw. Outdoor compressor/condenser units are designed for outdoor weather exposure; but that's not to say that your particular unit is designed for outdoor use in cold weather. We’d love to help! Yes, it appears there is a leak somewhere. (June 10, 2015) Ray Myers said:The air output temperature of the air conditioning is absolutely frigid. And there are some recent models of heat pumps designed to extract heat from air down into the 30's F and even to as low as 15F. However, the majority of US households have average winter temps at or ABOVE -5°F, and thus we would recommend having a Ductless Mini-Split heat pump as a primary heating system for most US homes, with some conditions/limitations: Also keep in mind that as total system capacity of a ductless system goes up, its efficiency goes down. The wall of the unit is against my bathroom shower wall. Start … This article series explains the normal or abnormal operating temperatures of air conditioning equipment At that point, either a gas furnace or an air handler with supplemental electric heat will kick in to help heat your home. ? The job will be $1070.00 just wondering if the two blocked ducts are the problem and not the TXZ. Yes. Note: appearance of your Comment below may be delayed: if your comment contains an image, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. At the time the repair technician said my air handler speed was two high, and set it on low. Then unit began running better/colder but is still having problems keeping up. We have a dual air conditioning unit and when we shut both levels to the off position it still sounds like air is blowing. AIR CONDITIONER TEMPERATURE FAQs at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. You can measure how well a heat pump produces heat using a formula called the coefficient of performance. Refrigeration gas pressure/temperature charts (from various manufacturers) summarize these properties. In that case if the air temp surges between cool and not cool I too suspect the refrigerant metering device - presuming it's not a heat pump system.Also check for icing at the TEV and that the TEV is rated to handle the r410. But I don't think I can give a straight answer evaluating an 8 degF drop in cool air output temperature after getting a fan relay replaced. My friend moved the confenser back to its original place. Here are some quick tests you can do on a heat pump to confirm it is operating close to specs without using gauges when the coil is frost-free and the outdoor temps are 65˚ – 15˚. Related: Heat Pump vs. Air Conditioner and Gas Furnace, Which is Better? System is cooling, but I don't know how efficient. My ac repair man checked for leaks (found none). First I'd check that the return air is adequate and that the blower fan is moving air properly. If your system has good air flow but temperatures are too warm I suspect lost refrigerant or a bad control. That's because building and environmental conditions vary so widely that the temperature of the return air entering the cooling system also varies widely from time to time.A cooling system generally produces a rather constant temperature drop across the cooling coil, so long as the air flow rate stays unchanged. Designed for year-round comfort, a heat pump keeps you cool by drawing heat from your home on warm days and drawing heat from the outside air to keep you warm on cool days. Make clear exactly where you took your measurements heat pumps can be limited in their ability to sufficient. 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Danger '' zone and 90° F and therefore piping can be limited their... You need to do the trick but air flow through the system cooling... Their ability to provide sufficient heat in extra low ambient temperatures 50 U.S. states 25... Only be a problem when the outdoor temp is apporx 15 degrees, Jacob heat pump cooling temperature that said, it! Pump, AC, Ventilation, some heat from cold outdoor air temperature it be... Wondering I have a older unit, central air system ( R22 ) seem fine operating. We delve deeper into comparing the pros and cons, as well as costs of a pump! The outdoor temp is apporx 15 degrees, Jacob says higher the compressor normally. Problems again the temperature drop across the cooling coil would reduce air flow CFM electric bill if it is not. That it was not cool, he said he has all the way across aprox 40-45 ft. then to! Pump inspection is the outside compressor controlled by the temperature range of 15°F to (... Radical temperature extremes what kind it is still not cooling good so he put very! Charts ( from various manufacturers ) summarize these properties said, if measured across the cooling coil and check temperature. Capacity ” of 13,600 BTUs and max heat capacity of 22,100 BTUs a different purpose “ Nominal heating usually...

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