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TXV on outdoor unit

1.3K views 17 replies 6 participants last post by  lorge1989  
#1 ·
I have searched, and cannot find my answer. Probably just overthinking it.

Adding a heat pump to my forced air gas furnace. Originally was going for just an AC condenser but have now decided to go with a heat pump and use a dual fuel system.

The AC addition seemed very straightforward, as does the heat pump except for one thing. Do I need to add a TXV on the outdoor unit? Does the unit come with one internally? Will my unit just have the piston style metering device? Is that sufficient?

The indoor coil I have chosen states it comes with a TXV with a built in check valve bypass. But I see no similar note for the outdoor unit. Below are the items I plan on using (I would post links but I can't because I have less than 7 posts). Any other suggestions are appreciated!


Goodman 2 Ton 16 SEER Heat Pump Air Conditioner Condenser
Model: GSZ160241 Item Number: 72289

Goodman CAPT - 2 Ton - Upflow/Downflow A Coil - Cased - TXV Included - 14" Width
Model: CAPTA2422A4 Item Number: 117636

I live in Buffalo, NY. I plan on running the heat pump up until around freezing (haven't fully decided yet).

Thank you for your help.
 
#3 ·
It comes with it.
Have you determined your furnace has sufficient airflow for the heat pump? What fossil fuel device are you using?
It is a natural gas furnace. It is an older unit, not variable speed. Its 75000 BTU. It seemed to me that would be enough for the 400 or 500 cfm per ton that is recommended. I would prefer not to get into a full furnace replacement at this time.
 
#8 ·
Post a pic of that furnace with both doors off. If it is what I am thinking it is you may want to get a new furnace.

I worked on thousands of NUGS and KUGS as they are both ICP, Heil or Keeprite units. If I remember correct few of them last 20 yrs as the heat exchangers crack. They also burn thru exhaust fans quite often. ICP is very popular where I am. Also the blower on them is kind of weak. More of a basic builders grade unit.

It is a mid efficiency furnace with a metal chimney correct? If so you will save a lot more fuel and $$ with a high efficiency furnace in your area than adding a heat pump.
 
#9 ·
I was only doing the heat pump idea since when purchasing an AC condenser its only about $500 more for the heat pump itself (I was/am trying to DIY some of this). Most of the other stuff, besides maybe a new thermostat is the same. I figured for $500, it would be worth it. I don't plan on being in this house for more than a couple more years, that's the reason I wasn't going to replace everything.

After my research on the whole heat pump idea, its seems as though its not as straightforward as I originally thought. I intended to install the indoor and outdoor units, run the lineset and electrical and have a friend of mine (HVAC guy) make the final connections and vacuum down the system. Heat pumps are not his specialty so he is not comfortable giving me advice on that aspect of it. At this point I'm sort of back to the drawing board because it seems my furnace does have some limitations to it, and like you said it probably could use replacement.

I attached the only image I have handy at the moment.
 

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#17 ·
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If you did not have to spend a ton of money on that unit and it lasted 30 yrs you won the lottery. I am sure you will enjoy the new units. Heat pumps blow cool air and that is not my cup of tea.