Results 1 to 5 of 5
  1. #1
    Join Date
    Jan 2006
    Posts
    13

    Does this sound right?

    I am replacing my furnace/zone controls/dampers/t-stats, my contractor has proposed two options:

    1) Lennox G61MP furnace with LZP zone contols and 2 digital tstats. They tell me that the tstats will be single stage because I can't run 2-stage stats on 2 zones with the LZP controls.

    2) Lennox G61MPV furnace with a Harmony zone controls and two digital 2-stage stats. He says the only way to use 2-stage tstats is to install the Harmony zone board.

    I am leaning towards the second option, as (from what I've read), using a single stage tstat on a 2-stage furnace greatly reduces the value/efficiency.

    Also I have an existing Lennox A/C compresser (model HS26-060-2P) that I am keeping.


    My questions:
    - does all of this sound correct?
    - what type of tstats should I be requesting with the Harmony controller?
    - should I use 2-stage tstats or "modulating" tstats?
    - is it OK to use a variable speed motor with the existing A/C, or do I risk coil freeze?

  2. #2
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,725
    might want to find a dealer that can read install instructions.........


    harmony system makes 2 stage stats useless because theres no place to hook them up.


    harmony panel uses 1 stage stats and discharge air sensors to regulate staging on equipment.

  3. #3
    Join Date
    Jan 2006
    Posts
    13
    wow - can you help me understand this a little better? what are discharge air sensors? and does it even make sense to be using a two-stage variable speed furnace with 1-stage stats?

  4. #4
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,725
    harmony panel is designed for 2 stage units and one stage stats it will work as lennox designed it with that furnace.

    my only concern would be the 1 stage a/c unit.

  5. #5
    Join Date
    Jan 2006
    Posts
    13
    do you mean concern about the coil freezing? what else can be done - is there a way to set the blower to a constant speed for A/C to avoid this?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event