# of Honeywell Zone valve

Discussion in 'HVAC Heating & Cooling' started by rockycmt, Dec 5, 2007.

  1. rockycmt

    rockycmt New Member

    Messages:
    129
    Location:
    New York
    I currently have 3 zones on my hot water system. These valves run at 24volts from what I have read. I was wondering if I can add 2 more zones to the system? Is there a limit to how many zones the 24 volt transformer can support/power?
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,019
    Location:
    New England
    Absolutely...the transformer may need to be updated. It should be marked with VA rating, which will indicate how much power it can supply. Each valve will also have a required value. Add up the load, and then compare with what's available. The transformers aren't often particularly expensive or hard to replace, if required. Yours could have enough capacity, but you need to check to be sure. The valve's requirement should be in their spec sheet.
  3. rockycmt

    rockycmt New Member

    Messages:
    129
    Location:
    New York
    I will do that, Thanks for the info.
  4. rockycmt

    rockycmt New Member

    Messages:
    129
    Location:
    New York
    Here are the specs on a new 24 volt transformer.

    http://pexsupply.com/product_dtl.asp?pID=1740&cID=282&brand=Honeywell
    Voltage: 750 mV
    Connection Type: Spade Terminals
    Lead Length (in.): 35 in.
    Lead Length (mm): 889 mm
    Open Circuit Output (mV): 600 mV to 750 mV
    Resistance: 2.89 ohm
    Temperature Ratings (F): Hot Junction 1400 F
    Temperature Ratings (C): Hot Junction 760 C
    Temperature Ratings (F): Cold Junction 780 F
    Temperature Ratings (C): Cold Junction 416 C
    Includes: push-in clip
    Used With: Q314, Q324, Q327, Q377, Q379, Q382 Pilot Burners
    Tradeline Value: Tradeline
    Ref: Honeywell.com

    What is the actual numbers I need to compare? I do not see a VA reference.
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,019
    Location:
    New England
  6. Chris75

    Chris75 Electrician

    Messages:
    608
    Location:
    Litchfield, CT

    If you look at the wattage of the zone valve and the VA of the transformer you can figure out hot many a 40VA transformer will hold, But you can always use as many transformers as needed...

    I really like these Taco Controls, they simplfy the wiring and neaten it up quite nice, take a look... You can get a 6-zone board, which comes with 2 transformers built right in...


    [​IMG]
    Last edited: Dec 5, 2007
  7. rockycmt

    rockycmt New Member

    Messages:
    129
    Location:
    New York
    Ok, So just to finish this off..

    The total watage of the valves (Simply add them all up) can not exceed the VA of the transformer?
  8. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,019
    Location:
    New England
    As I understand it, yes. power=volts x amps.
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