Adding Zone valves to Honeywell Aquastat L8148J

Discussion in 'HVAC Heating & Cooling' started by Gusaroo, Mar 6, 2014.

  1. Gusaroo

    Gusaroo New Member

    Mar 6, 2014
    OK, new to this board, hope I found the right place!.

    I'm a homeowner with some basic knowledge of my boiler set up. I've got a Honeywell Aquastat L8148J relay on my old Burnham boiler. My boiler was a single zone system without zone valves, but I've recently added 2 zone valves. I cannot seem to figure out how to power them. I've checked out the L8148J using my multimeter as well as reading thru the Honyewell manual and cannot find 24V. It says I should be able to power two zone valves with this relay, but I am stumped.

    Referring to the upper schematic of the two diagrams in the picture below, B1(or B2) to B3 does show 24V, but only when the TV-T is tripped and the boiler is fired. I need 24V all the time and let the zone valve end switches trip TV-T (to fire the boiler and run the circ pump).

    I read that TV-W should be able to power them, but it speaks of removing a jumper (which is currently there) or something in relation to my gas valve. I'm afraid to mess with this piece.


    L8148J manual here:
    Last edited: Mar 6, 2014
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    I think you want to follow Fig. 7.
  3. Sponsor

    Sponsor Paid Advertisement

  4. Gusaroo

    Gusaroo New Member

    Mar 6, 2014
    That's exactly what I did and it seems to be working...I'm powering my zone valves with TV-W. The notations (2 on fig 13, and 3 on fig 7) regarding the jumper worries me though. I left it in place as it was.
Similar Threads: Adding Zone
Forum Title Date
HVAC Heating & Cooling Adding a Zone to a Boiler Jan 9, 2017
HVAC Heating & Cooling Adding new radiant heat zones to existing system Feb 21, 2015
HVAC Heating & Cooling adding zone control to system Sep 29, 2013
HVAC Heating & Cooling adding zone, please review my design draft Feb 1, 2012
HVAC Heating & Cooling Argo ARM-2P Adding a Zone Feb 13, 2008

Share This Page