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Old 12-04-2010, 10:54 AM   #16
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Heat pump issues


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Originally Posted by Anti-wingnut View Post
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*.
Depends on the heat loss of the house. A real leaky house the HP might not be able to keep up at 38 but a tight house can use the HP for 100% of the heating down around zero. Mine can keep the house at 72 without back up heat untill the outdoor temp gets to 9 degrees,house built in 1955 with 3 year old windows and doors.

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Old 12-04-2010, 10:57 AM   #17
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Heat pump issues


No.

Impossible

The heat content of the air is not sufficient
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Old 12-04-2010, 11:03 AM   #18
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no, as long as you are putting heat into the home it will maintain, my house does, I have my balance point @ 20 degrees before back up kicks in. the air may feel cool to the touch, but is actually still warming the house
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Old 12-04-2010, 11:08 AM   #19
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I set up and verified performance on thousands of heat pumps over the years. How about yourself?
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Old 12-04-2010, 11:16 AM   #20
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Heat pump issues


Say and claim what you want. It is physical dynamics of a heat pump operating at 0*F makes it impossible that it would not call for additional heat
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Old 12-04-2010, 11:17 AM   #21
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no, as long as you are putting heat into the home it will maintain, my house does, I have my balance point @ 20 degrees before back up kicks in. the air may feel cool to the touch, but is actually still warming the house
Yep. When gas was high I didn't set a lock out for the HP so it ran untill the house temp fell another half degree to turn on the back up . Found the thermal balance point to be 9 degrees.
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Old 12-05-2010, 10:06 AM   #22
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Heat pump issues


Thanks to all you that have replied.
the heat pump unit is a 3 ton 13 seer unit both indoor and oudoor units matched set. have had no issues until this year, unit cleaned and serviced on an annual basis. filters changed monthly. The unit is defrosting.
todays temp at 6am was 37f home mainted a thermostat seeting of 73f
checked several times last evening, early this morning and at no time was AUX heat on. I purschased a A/C mainfold set yesterday, i also have a digital temp gauge. can someone provide me a easy to follow procedure as to checking the pressures to insure that they are indeed correct on the heat cycle. As I stated yesterday when the service tech came he had me put the unit in cooling mode when he did his pressure checks? seems like thats not the norm when we are in the winter months? I have printed a pressure chart, but not sure on the correct procedure.
it mentions superheat? your assistance is appreicated.
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Old 12-05-2010, 10:25 AM   #23
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Heat pump issues


you really need to go to school to learn about super heat and sub cooling, and understand the principles, its not just as easy as pressures and temperatures, because they are affected by air flow, indoor and outdoor temperatures and wet bulbs. Leave this to a pro, if your not satisfied with your contractor then get a second opinion from another
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Old 12-05-2010, 01:27 PM   #24
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Heat pump issues


Good advice tech. Auto- there's not a set pressure all heat pumps will run at a certain temp but if you have a chart showing what your HP is supposed to be in heating mode then follow it. Superheat and subcool are never the same in heating and cooling modes so charging with them in heating isn't accurate unless you have that data for your particular equipment in heating mode.

A 10 degree temp rise on a 3 ton unit at 35-40 degrees is way under performing, only a 13,000 BTU output. Should be closer to 26,000 BTU output.
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Old 12-05-2010, 05:08 PM   #25
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Heat pump issues


With all these pressure readings that are being taken you probably are now low on gas. These are critically charged systems that need to be checked against the units own charging chart. There are to many variables to mention here that this thread can last for days trying to educate you in heat pumps. Yes it is good to know how things work and to make sure you're not being stiffed. I myself always use the internet to find info on auto, m/c and tractor repairs, but this trade takes years of training and exp. and still some never get it. Not to sound like a wiseguy but good luck.
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Old 12-06-2010, 01:43 PM   #26
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Heat pump issues


Hello to all that replyed,
I appreicate your interest and information that you have provided.
I had another HVAC contractor out today ( not the original contractor )
He provided me the following information: System is within normal operating pressures, IE charge, air flow. At least he made the checks in the heating mode. He questioned if we had ever obtained 95+ heat from the registers, which in fact I told him we had. He told me that 95F heat is not something that he sees on a regular basis with out AXT heat running.
His recommendation to me was to run the heat strips at all times in the heating mode, using the unit only as A/C in the summer months. So what he is telling me that I will not be using the heat pump as my heat source this winter. After further explanition he told me that only the air handler would be running and blowing across the heat strips, no outside unit running? he stated that they have set this up on many homes? My questions are is this safe? seems like I will have one outragous electric bill? as always I appreicate your thoughts.
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Old 12-06-2010, 02:10 PM   #27
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Heat pump issues


WRONG!!!! use it as heatpump, thats what you payed for! Talk about high electric bill, umm yeah, if you run strip heat, you will be paying $$$$$ to heat home....
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Old 12-06-2010, 02:53 PM   #28
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Heat pump issues


Thanks HVACtech126. about what I thought also. think I should try another contractor for repair or just install a new 410 unit? In your opinion a 410 unit better than the 22? I appreicate the advise
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Old 12-06-2010, 04:28 PM   #29
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if your equipment is over 15 then look at replacement, as far as R410a goes, i like it, but don't have a choice in whether to use it or not, new installs must be 410. some say you get better heat transfer from it.........
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Old 12-08-2010, 07:10 PM   #30
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Heat pump issues


I appreicate the replys in reference to my heat pump issues. currently
i am running on emergency heat> last evening a 5 amp fuse blowed in the air handler, replaced the fuse blew again. had the service tech come out.
said transformer was bad on the 24 volt side, replaced the transformer, went to put unit in heat mode fuse blew again, tech stated transformer was getting hot. made some additional checks and determined that the orange wire going to the condensing unit had a short to ground, he removed the orange wire, there were two of them one from thermostat to the air handler and the other comming from the condensing unit. after disconnecting the orange wires allowed the air handler to run in emergency mode. he checked the unit outside for any wire issues found none. system is only 8 years old. recommended replacing the unit
mentioned the rudd acheiver system and another line of rudd which he said was bottom of the line. was wondering what the difference in the two units were, nothing direct, just the acheiver system was better? your thoughts, suggestions if the rudd system is quality or what brand you recommend. they did not have the expertise to take the troubleshooting
of the condensing unit any further any thoughts as I really cannot afford a new unit at this time. Thanks in advance

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