Is it possible? Or am I just crazy?
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  1. #1
    Join Date
    Feb 2005
    Location
    Richmond
    Posts
    480

    Arrow

    Ok, I know this is going to sound crazy, but does anybody here know if it is possible to hook up an Economizer using Honeyewells W7210A logic module to a Carrier Infinity 96 Furnace and a Carrier Performance 13 Condensor? I think I might have a clue on how it would be wired:




    What are your thoughts on this? Is it possible? Am I crazy?

    Logic Module: http://customer.honeywell.com/honeyw...777CCCAD5B3%7d

    Damper Motors: http://www.belimo.us/belimoshop/index.jsp?shopId=BELIMO

    Enlapathy Sensor: http://customer.honeywell.com/honeyw...777CCCAD5B3%7d

    Discharge Air Sensor: http://customer.honeywell.com/honeyw...777CCCAD5B3%7d

    Thanks for your feedback!

    -York_Hvac

  2. #2
    Join Date
    Feb 2005
    Location
    Toms River, NJ
    Posts
    425
    I think you need a hobby.


  3. #3
    Join Date
    Sep 2003
    Posts
    1,311
    Here's a simpler and cheaper way:

    Use the Belimo LF24 (I think) spring return motor. Use a remote sensor thermostat (we'll call it the RST) which has a simple SPDT switch output. Wire the 'Y' from the thermostat to the input of the RST switch. Wire the 'close on temperature rise' terminal on the RST to the 'Y' terminal at the furnace. Wire the 'open on temperature rise' terminal on the RST to the Belimo actuator. Then wire the common from the Belimo actuator to the furnace circuit board common. Set the Belimo actuator to open the damper on a 24V signal. Then set the RTS to the outside air temperature which you want the economizer to take over.

    How it works: If the thermostat is calling for cooling but the outside air temperature is high then the signal will be sent directly to the furnace. But if the outside temperature is low then the signal is diverted to the economizer damper motor, thus the furnace never sees the call for cooling; However the furnace will still see the call for fan and will kick on the fan while the economizer opens up. Thus the outside air will be used for cooling rather than the AC when the temperature gets low enough.

  4. #4
    Join Date
    Feb 2005
    Location
    Richmond
    Posts
    480
    Originally posted by smadave
    I think you need a hobby.

    Hey! I have hobbies! Model Trains, RC Planes+ Micro Helicopters, Model Rockets and RC Cars. HVAC IS one of my hobbies/intrests. Hey, I like the idea of the RST insted of all the extra wiring.

  5. #5
    Join Date
    Sep 2001
    Location
    Vancouver Canada
    Posts
    996
    Sounds like a fairly simple setup, I need to do the same on a Keepright rooftop that they no longer make an economizer for. In a Gym and they need to run cooling in the winter, temp inside is set to 62 degrees.
    "Go big or Go Home"

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