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Wiring furnace Humidifier Help

PokeTheBear
PokeTheBear Member Posts: 1
I am adding an Aprilaire 400m to a Carrier Performance Series furnace. I am using the Carrier COR thermostat and want eliminate the Aprilaire humistat and control it through the COR thermostat.  I can connect it to the HUM port on the control board but that only activates it on a call for heat. I want have it activated anytime the blower is activated instead when humidity is needed. The only way I can see is to connect a 24v transformer and connect the hot line to the EAC-1 and then connect the neutral to the EAC-2. Then run both wires off of the transformer back to the solenoid valve on the humidifier. Does this sound correct? Or is there an easier way to connect without using the transformer? Thank you so much for any assistance. 

Comments

  • SuperTech
    SuperTech Member Posts: 1,640
    edited March 29
    That would work, but it would also bring on the humidifier during a call for A/C if your furnace is equipped with it. You would need to wire in a normally closed relay to open the humidifier circuit during a call for cooling.  

    That humidifier doesn't work very well without heated air to aid in the evaporation over the water panel. 
    HVACNUTSTEVEusaPAJUGHNE
  • HVACNUT
    HVACNUT Member Posts: 3,918
    That would work, but why not have control over it? 

    STEVEusaPA
  • JUGHNE
    JUGHNE Member Posts: 8,317
    I learned that about not having warm air flow thru the water panel.....it just wastes the water and the panel.
    Especially noticed the lack of heat on heat pump systems.
    SuperTech
  • SuperTech
    SuperTech Member Posts: 1,640
    The 400 series uses a water panel that absorbs the water like a sponge, they don't use a drain and have water flowing through them. However it will still ruin the panel rather quickly, and foul up the bottom of the tray and the floats that shut off the solenoid when they tray fills. It all becomes full of sediment and everything else that is leftover when the water finally evaporates.  

    Use the control, set it up so it doesn't bring the blower on without a call for heating.  
  • HVACNUT
    HVACNUT Member Posts: 3,918
    A steam humidifier like the Aprilaire 800 is the only way to go. Fan on with a humidity call. I've done a few with the outdoor sensor and have been called back to remove it. Mostly in the tighter houses.
  • mattmia2
    mattmia2 Member Posts: 3,008
    Wait so that is like a flow through but it collects the crap that is supposed to flow through in a pan then it puts a float in the pan of concentrated minerals and expects that float not to stick and cause a flood?
  • Jamie Hall
    Jamie Hall Member Posts: 15,858
    mattmia2 said:

    Wait so that is like a flow through but it collects the crap that is supposed to flow through in a pan then it puts a float in the pan of concentrated minerals and expects that float not to stick and cause a flood?

    A lot of stand alone humidifiers do that. In fact, any humidifier which isn't basically flow through -- such as, perhaps, a simple spray with a collector tray and recycle line -- will do that. If water is fed to the unit and evaporated, but there is no continuous drain for the excess water, whatever was in the water when it came in is going to stay there. Dust. Minerals. Crud. Whatever. Got to get rid of it somehow!
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • SuperTech
    SuperTech Member Posts: 1,640
    mattmia2 said:
    Wait so that is like a flow through but it collects the crap that is supposed to flow through in a pan then it puts a float in the pan of concentrated minerals and expects that float not to stick and cause a flood?
    Its a completely different panel than the flow through. Aprilaire #45 panel, the same size as the #35 flow through panel. Bad things happen if someone puts a #45 where a #35 should be, or vise versa. 

    I've never seen a 400 cause a water leak, even when neglected. The panel and humidifier can get pretty gross if not replaced and cleaned annually. It's a builder grade humidifier.  The Aprilaire 800 is definitely much, much better.  
  • HVACNUT
    HVACNUT Member Posts: 3,918
    There's 2 float switches on the 400. And if they both happen to fail due to lack of maintenance, there is a drain. 
  • unclejohn
    unclejohn Member Posts: 1,718
    The 400 is a waste of time and money. Doesn't waste much water though. Doesn't evaporate much water either.
    SuperTech
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