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Old 06-15-2009, 02:17 PM   #1
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Hvac won't cool below 76 deg.


I installed a new split unit a week ago it cooled fine the 1st day but now it will not get house below 76degs at night nor will it get the house below 80 during the day. The a/c guy who helped me say there is enough freon in new unit to do the job. We ran 28ft of copper line. What should I be looking for as a possible problem to low cooling?

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Old 06-15-2009, 02:27 PM   #2
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Hvac won't cool below 76 deg.


How hot outside? How many people in the house?

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Old 06-15-2009, 02:28 PM   #3
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Hvac won't cool below 76 deg.


89 deg outside 4 people in the house.
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Old 06-15-2009, 02:33 PM   #4
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Hvac won't cool below 76 deg.


Are the blades of the outside compressor fan spinning?
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Old 06-15-2009, 03:29 PM   #5
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Hvac won't cool below 76 deg.


First thing I look for is if there is enough air flow for the size of the unit.

28ft f line set is more then the ac comes charged with. Not taking anything away from the hvac friend, but did he add the amount of freon to make up the difference?

Most units are charged for 15ft.

Have you checked your filter to make sure it's clean and not blocking airflow.

How big is your home in square feet and what tonnage ac did you installed?


If the outside temp has been about the same as the day you installed it I would suspect a leak.

Did you make sure the blower is on high speed for ac?
Other considerations could be if you have an older furnace the blower could be going bad since the ac requires the high speed setting on the blower. If the motor was borderline at the low speed heat setting the higher speed requirement for an ac would hasten it's demise.

it would help to know the brand of equipment and the model numbers of the out side unit and the inside coil.
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Last edited by hvaclover; 06-15-2009 at 03:35 PM.
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Old 06-15-2009, 05:56 PM   #6
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Hvac won't cool below 76 deg.


Air flow.
And then charge.

As Clover said. Most units only come precharged for a 15' line set. And the most comon indoor coil sold for that unit.

The install instrctions will tell you/him how much should be added.
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Old 06-15-2009, 06:02 PM   #7
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Hvac won't cool below 76 deg.


Hey Been, I think we got a runner...he hasn't checked in for answer in over four hours...
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Old 06-15-2009, 06:04 PM   #8
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Hvac won't cool below 76 deg.


Maybe he went to teh neighbors to cool off.
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Old 06-15-2009, 06:12 PM   #9
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Hvac won't cool below 76 deg.


lol..
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Old 06-15-2009, 07:43 PM   #10
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Hvac won't cool below 76 deg.


4 people giving off too much body heat ??
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Old 06-15-2009, 08:49 PM   #11
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Hvac won't cool below 76 deg.


TOO MUCH BODY HEAT???
WHAT ARE THEY DOING IN THERE?
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Old 06-15-2009, 08:54 PM   #12
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Hvac won't cool below 76 deg.


Quote:
Originally Posted by hvaclover View Post
TOO MUCH BODY HEAT???
WHAT ARE THEY DOING IN THERE?
"2. A human at rest will add 450 Btu/hr of heat to the room, so you need to add this amount times the maximum number of occupants that you estimate will be in the room on a design cooling day (the hottest day of the summer).

3. A human exercising (e.g. Gymnasium or exercise room) will add 2,000 Btu/hr of heat to the room so you need to add this amount times the maximum number of occupants that you estimate will be exercising in the room on a design cooling day
(the hottest day of the summer)"
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Old 06-15-2009, 08:59 PM   #13
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Hvac won't cool below 76 deg.


Quote:
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"2. A human at rest will add 450 Btu/hr of heat to the room, so you need to add this amount times the maximum number of occupants that you estimate will be in the room on a design cooling day (the hottest day of the summer).

3. A human exercising (e.g. Gymnasium or exercise room) will add 2,000 Btu/hr of heat to the room so you need to add this amount times the maximum number of occupants that you estimate will be exercising in the room on a design cooling day
(the hottest day of the summer)"

LOL...so serious Yoyzit...I know that too.....where's your senses of humor and imagination?
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Old 06-15-2009, 09:03 PM   #14
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Hvac won't cool below 76 deg.


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LOL...so serious Yoyzit...I know that too.....where's your senses of humor and imagination?
That depends on what exactly they are doing to burn off 2000 BTU
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Old 06-15-2009, 09:06 PM   #15
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Hvac won't cool below 76 deg.


exactly.

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