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  1. #1
    Join Date
    Mar 2006
    Location
    Central Virginia
    Posts
    18
    I have a question for those of you who may have had experience installing one of these type systems.

    A customer of mine wants a hybrid system, heat pump (410A - 14 SEER)/gas furnace (90+%AFUE) combination.

    Is there a favorite brand that's preferable? Would the gas furnace be rigged to be second stage heat? Could it be set up with an outdoor thermostat that would give the furnace signal to come on at 35 deg F (or some determined temp) or below?

    He also mentioned he'd like to have the option to use backup heaters in the heat pump as an alternative to gas depending on future gas prices. I'm not sure how to do this but it can be done I'd like to find out how.

    Experience installer but not for one of these systems. Any input or advice appreciated.


  2. #2
    Join Date
    Nov 2005
    Location
    Kansas
    Posts
    4,413
    No favorite brand per se, personally like UPG products for HP control, but other brands will do fine as well.
    Gas furnace is 2nd stage heat on single stage HP or stage 3 on 2 stage HP
    System needs dual fuel kit installed separate or integrated in thermostat. This will control heat source. Depending on location an outdoor thermostat is beneficial or necessary.
    I am not aware of UL listed solution for gas and electric heat strips.


  3. #3
    Join Date
    Jun 2004
    Posts
    459

    gas backup

    Originally posted by duckhunter
    I have a question for those of you who may have had experience installing one of these type systems.

    A customer of mine wants a hybrid system, heat pump (410A - 14 SEER)/gas furnace (90+%AFUE) combination.

    Is there a favorite brand that's preferable? Would the gas furnace be rigged to be second stage heat? Could it be set up with an outdoor thermostat that would give the furnace signal to come on at 35 deg F (or some determined temp) or below?

    He also mentioned he'd like to have the option to use backup heaters in the heat pump as an alternative to gas depending on future gas prices. I'm not sure how to do this but it can be done I'd like to find out how.

    Experience installer but not for one of these systems. Any input or advice appreciated.

    Trane company makes a good dual kit, all control wiring terminates at the controller, which monitors and controls the gas furnace and the heat pump, allowing both to operate in harmony.

    As for electric auxillary heat strips, the only style I know of are compatible with rectangular metal duct only, and the position in the duct is critical in relation to the furnace.

  4. #4
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,054
    If the gas furnace is single stage, get ya a TH8320 Vision Pro with C7089 outside sensor. Set it up as a dual fuel thermostat.

    Also, suggest you register as a pro as we'd like to keep technical discussions in the Pro's Forums. On the other hand, I'm wondering since you mention backup heaters in the heat pump. The backup heaters are in the electric furnace, something you wouldn't have with dual fuel


  5. #5
    Join Date
    Mar 2006
    Location
    Central Virginia
    Posts
    18
    He's referring to the backup strip heaters normally installed as auxillary heating for heat pumps used in conjunction with this hybrid system. He has a desire to switch between the furnace and the auxillary heaters depending on the price of gas, etc. I'm not certain how to do this or if it can even be done. I've never installed one of these units before so I'm not familiar with them.

    What are the credentials needed for registering as a Pro? I'm scheduled to take the Master HVAC exam in 2 months.



  6. #6
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,879
    The Affinity's defrost board is a duel fuel control.

    As some one else said you would need duct heaters to have elec, as an option also.

    We can tell you how, after your registered as a pro.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  7. #7
    Join Date
    Oct 2004
    Posts
    167
    The Carrier Infinity thermostat also does duel fuel control. Of course you need the matching Carrier equipment. As for the strip heater, thats gonna be a lot of $$ to install and wire for future "possibility". I'd recommend having a spot for the heater but not installing it unless it was desired in the future.

  8. #8
    I hear ya son the carrier infinity or the bryant evolution is by far the best hybrid system on the market all you have to do is turn it on and it senses the dual fuel no wires to change or anything

  9. #9
    How many degree days of heating below the 35*F balance point? Will the 90% + gas furnace pay for itself? 80% eff. furnace good enough?

  10. #10
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,879
    That will vary with the rates for each area.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  11. #11
    Join Date
    Nov 2005
    Location
    Kansas
    Posts
    4,413
    Originally posted by duckhunter

    What are the credentials needed for registering as a Pro? I'm scheduled to take the Master HVAC exam in 2 months.
    just register

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