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My HVAC only has a 5 degree difference from the cold air return to the discharge and my air excahrger freezes over because the unit runs constantly. I have had the entire system cleaned and the filter is only a 6 merv to maximize the air flow. What next? Have the freon charge checked?

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Odds are it's either a low freon issue or low airflow.

Posted on Jul 07, 2008

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Hi. I need help fixing my urka-a042jk10e Air Conditioner please. It's not blowing any air up thru the vents and my house is 97 degrees!


Possible that the compressor is not running. Call a service tech. Could be a run capacitor bad, stuck reverse valve or even a shot compressor.

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Kindly check outdoor unit fan Motor running or not . and it may possible blockage in the copper tubes (/capillary)/.need to internal clean by nitrogen flushing.

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Sounds like it could be low on freon I believe these units have about 1.5 pounds of freon in them and are critical in not undercharging or overcharging them if it is a freon 410 ac unit the pressures should be about 135 and both lines cold if is low on freon a service tec will need to be called to try to repair the leak if possiable

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My Goodman CK361D unit blows cold air from the vents and it is cold when you stand there. But it doesnt seem to push it throughout the house. we can run it for hours and it will still be over 70 degrees in...


There are alot of factors when dealing with this problem. Heat Load ( Typical A/C unit is designed with a split of 20 degrees farenheit.) If you measure the temperature leaving the discharge registers, the temperature should be around 20 degrees colder than the air entering the return air grille (Filter Location). Also your unit seems to be a 3 ton; In which this system is designed for roughly 450 sq. ft. per ton and can go as high as 550 sq. ft. on newer homes with more than adequate insulation values. On older homes with minimual insulation the 400- to 450 sq.ft. rule per ton should be observed. Another reason could be that the units needs servicing like a dirty condenser coil or evaporator coil, improper refrigerant charge, etc can all be issues that can result in your problem.
Finally, most typical units or designed to maintain a home 20-25 degrees below outside temperature. Example 95 degrees outside, inside should not be set lower than 70 to 75 degrees, and the 5 degree range depends on the SEER (Seasonal Energy Efficiency Rating/Ratio ) of your unit. Hope I was helpful in giving you some direction in things to look for to resolve your problem.

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1 Answer

Central air unit out side will run non stop in hi temp cond and not cool very well, coils have been cleaned along with condenser and evap. it will run and turn off in early morning hours, freion is wher it...


Here is what you need to do to make sure your system is charged correctly go to the furnace take the temperature of to supply temp and take the return temperature at the furnace. You should have 18-20 degrees temperature difference if your return temp. is 77 degrees you should have 57 to 59 degrees. If you dont have these temps your system either wasnt cleaned properly or not charged correctly. If this helps please rate me and do a testimonial.

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REPLACED BOTH ELEMENTS GOT HOT WATER FOR 1 SHOW THEN IT GOT COOLER AND COOLER AND NOW ITS COLD ONLY?


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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What should be the correct supply and discharge temperature of a goodman hvac


Depending on the temperature & humidity level in your house, the temperature difference of the air entering your air handler and the air blown into your house should be in the 16 - 21 degF range. The temperature difference of the air entering your condensing unit and the air leaving your condensing unit should be between 25 - 30 degrees, with 30 degrees being for older model units. Anything above 30 requires cleaning.

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i hope the air condition is feet to your home ,if u have ceiling tall
the heat will stay high point ,and the air condtion will be on most of the time. if not
and the mode is heat
firrst:

clean the filter in evaporator (out side the house).
check and see if the engine of the evporator work and runing.
without wibrtion.
but the main reason is most unit hvac are not inverter,
so that mean if the tempratore out side is beneed to 5 degree Celsius (most of the time night) the unit will be frozen.
60 degrees f = 14 degrees c
you can defrost the buy chnge to mode cool.
other cohice ic to check the dieicer if u have it.

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