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Old 12-23-2008, 08:49 AM   #1
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I'm in North GA, where its dipping down to the low twenties at night. I just built a brand new house and my dad and I did most of the work including the duct and hvac system. He's an electrician and has tons of working knowledge on just about everything. So, installing the system ourselves was a breeze.

We installed a 16 seer, 3 ton Grandaire heatpump split system. The unit has a two stage Copeland scroll compressor.

My obervation is that the system is always running. It will run on the first stage for a while, then jump up to two stage. But it doesn't seem to heat the house good until the aux heat comes one. Only then will I see the house heat up.

This is my first system with a two stage compressor. Am I just peroniod about it running all the time or do you think there is something to this???




Last edited by poolecw; 12-23-2008 at 08:52 AM.
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Old 12-23-2008, 08:52 AM   #2
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Heat pumps just dont do very well if the outside temps are 30 or below.


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Old 12-23-2008, 10:02 AM   #3
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If the heatpump didn't have professional start-up done you may want to consider one.
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Old 12-23-2008, 07:53 PM   #4
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read the owners manual it should explain how these sytems will and do run almost all the time they do this to provide more even heating than a conventional system where the house goes thru warm and cool cycles which tend to be uncomfortable to us humans. That being said, these systems need to be started and checked by a pro, refrigerant levels and airflow are crucial in these systems. im sure your dad knows some hvac dudes being in the elec trade have him have a buddy come check it out and get what your paying for...ken
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Old 12-24-2008, 01:00 AM   #5
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Not uncommon for a heat pump to run all the time at low outdoor temps.

Did you do a load calc on your house or just guess, and use a rule of thumb?
If you did a load calc, then you can plot at what outdoor temp you need aux heat, and know when the heat pump will go into continuous run.
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Old 12-24-2008, 08:05 AM   #6
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check the start-up info on what mode the unit should of been running whle the heating mode check the discharge line into the evaporator 1st and 2nd shouldn't be able to grab it if your max'd on the charge and,they should give you some temperatures required there in the manual.


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