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Old 12-03-2010, 11:12 AM   #1
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Heat pump issues


Good Morning
I have a fraizer johnson 13 seer split system matched heat pump
i am only getting 85f heat out of the vents. any idea as to what the problem may be? I have had the unit checked last week and the charge is ok on the unit. Filters are new. Any help is appreicated

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Old 12-03-2010, 11:13 AM   #2
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Heat pump issues


hello anyone one

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Old 12-03-2010, 11:14 AM   #3
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not able to veiw onlin chat message
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Old 12-03-2010, 11:32 AM   #4
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Heat pump issues


What is the outside temp? Are electric resistance heat strips coming on if necessary? Is the outside unit running correctly (defrost working, fan running)?
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Old 12-03-2010, 12:50 PM   #5
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Heat pump issues


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Originally Posted by autodoctor27 View Post
Good Morning
I have a fraizer johnson 13 seer split system matched heat pump
i am only getting 85f heat out of the vents. any idea as to what the problem may be? I have had the unit checked last week and the charge is ok on the unit. Filters are new. Any help is appreicated

That is likely normal if it is cold outside.. Did you use to get 95 or 100 out for the same temps outside?
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Old 12-03-2010, 05:11 PM   #6
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Heat pump issues


Heat pump model number, outdoor temp and indoor temp will help us to know if it's working correctly or not. Here's some info to figure it out yourself.

The blower speed should be 400 cfm per ton or close to it. Your heat pump produces roughly 12000 btu per ton at 47 degrees and roughly half that at 17 degrees. Supply air temp - return air temp = TD
TD X 1.08 X cfm = btu output
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Old 12-04-2010, 08:23 AM   #7
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Heat pump issues


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Originally Posted by fabrk8r View Post
What is the outside temp? Are electric resistance heat strips coming on if necessary? Is the outside unit running correctly (defrost working, fan running)?
Hello and thank you for your reply, the strips are working once i set the difference of 2 degrees on the thermostat. fan and defrost is operational.
had the thermostat set last evening at 74f register temp was 84f at 11pm
out side temp was 38 degrees. also the unit maintained the 74 with out the aux heat on. but still seems like i should be getting better than 84f at the vent? in the past i normally obtained in the high 90s temp. also the unit runs continous all night the last two evenings. I appreicate your assistance. would a new unit do better?
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Old 12-04-2010, 08:25 AM   #8
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Originally Posted by Marty S. View Post
Heat pump model number, outdoor temp and indoor temp will help us to know if it's working correctly or not. Here's some info to figure it out yourself.

The blower speed should be 400 cfm per ton or close to it. Your heat pump produces roughly 12000 btu per ton at 47 degrees and roughly half that at 17 degrees. Supply air temp - return air temp = TD
TD X 1.08 X cfm = btu output
Hello and thank you for your reply, the strips are working once i set the difference of 2 degrees on the thermostat. fan and defrost is operational.
had the thermostat set last evening at 74f register temp was 84f at 11pm
out side temp was 38 degrees. also the unit maintained the 74 with out the aux heat on. but still seems like i should be getting better than 84f at the vent? in the past i normally obtained in the high 90s temp. also the unit runs continous all night the last two evenings. I appreicate your assistance. would a new unit do better? I had aso measured the return air temp. 73 f with register temp early this morning still only 83-84f
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Old 12-04-2010, 08:35 AM   #9
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Heat pump issues


I also failed to mention that I took a digital tem probe and the tep on the large line at the outside unit is hot, 148f measured the same line inside at the air handler and it is 142f as i know i will have a temp drop across the coil should it be that much 50+ degrees. The service tech that came to look at the unit last week stated that the charge was good, but in my honest opinion was not sure he knew the proper procedure to obtain the pressure reading in the heat mode. he had me put the unit in A/C mode while he made the checks for pressure. what would be the proper way to determine the correct pressure in simple terms. I have goolged a pressue /temp chart and am willing to obtain a set of pressure gauges ( am doing that today) and would like to check myself. the last service call set me back right at $100.00 and seems like I see no difference.
I appreicate any and all assistance that you can provide.
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Old 12-04-2010, 08:40 AM   #10
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Heat pump issues


Quote:
Originally Posted by Marty S. View Post
Heat pump model number, outdoor temp and indoor temp will help us to know if it's working correctly or not. Here's some info to figure it out yourself.

The blower speed should be 400 cfm per ton or close to it. Your heat pump produces roughly 12000 btu per ton at 47 degrees and roughly half that at 17 degrees. Supply air temp - return air temp = TD
TD X 1.08 X cfm = btu output
Hello Marty
the supply temp was 84 the return temp 73-74
what is TD? stand for?
the unit is a r-22 this morning out side temp is 38 inside temp 74 and unit is running no AUX heat on
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Old 12-04-2010, 08:50 AM   #11
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Heat pump issues


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Originally Posted by zootjeff View Post
That is likely normal if it is cold outside.. Did you use to get 95 or 100 out for the same temps outside?
Thank for the reply, yes upper 90s around the same temps last year
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Old 12-04-2010, 09:32 AM   #12
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Heat pump issues


if you are maintaining temp at t-stat with out backup kicking in, you should be fine
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Old 12-04-2010, 10:06 AM   #13
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Heat pump issues


Difference between supply and return temp. So you had a 10 degree temp difference with a 38 degree outdoor temp. What size is the heat pump?
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Old 12-04-2010, 10:09 AM   #14
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Heat pump issues


is the hp defrosting?
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Old 12-04-2010, 10:22 AM   #15
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Heat pump issues


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Originally Posted by autodoctor27 View Post
out side temp was 38 degrees. also the unit maintained the 74 with out the aux heat on
Are you speaking of the HP's auxilary heat? Plain old simple physics makes it highly unlikely that any heatpump will supply strictly mechanical heat at 38*.

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