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Wiring a Vaporstat

brian_44
brian_44 Member Posts: 59
in Strictly Steam
Hey all. Sorry if there's a thread on this...I did a search, but didn't see anything specific.



After messing around with my pressuretrol PA404 (which is as temper-mental as an unhappy wife), I'm FINALLY in the process of installing a low pressure gauge to go along with a L408J1009 vaporstat. Currently, all of my radiators are steaming hot and about 15-20 minutes later the pressure builds enough (to about 1 PSI) to allow the p-trol to cutout. I see no reason for my system to be running that extra 15-20 minutes...just a waste of money! I'm thinking I can make my boiler way more efficient for a few bucks...Well, more that a few, but I hopefully save that in fuel over time!

I'm betting I can run it to cutout at 8-10 oz and still warm everything nicely.



As for wiring: Does the Honeywell vaporstat wire the same exact way as the existing Honeywell pressuretrol? Currently there are 2 wires that hook up to the p-trol. It would make sens that it's the exact same with the vaporstat but wanted to know for sure if that's the case as I'm sure many here have done this already.



Thanks,

Brian

Comments

  • Steamhead
    Steamhead Member Posts: 17,397
    That Vaporstat has three terminals

    wire your leads to R and B, so it will break the circuit on pressure rise.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • Rod
    Rod Posts: 2,067
    408J Vaporstat Manual

    Hi Brian- Here's the manual in case you don't have one

    - Rod
  • Mark N
    Mark N Member Posts: 1,119
    Why

    If your rads are steaming hot as you state, why not figure out why the tstat is not turning off your boiler. Instead of letting it run 15 to 20 longer than need be.
  • brian_44
    brian_44 Member Posts: 59
    Thanks!

    Steamhead & Rod- thanks for the info. Much appreciated.
  • brian_44
    brian_44 Member Posts: 59
    No problem with it running...

    Mark,

    Usually in the AM after a setback, the system has been running for a while and even though all rads are hot, the temp hasn't yet been satisfied. I run at 62 at night and at 65 during the day. So in most cases we might be at 64 degrees and there's no good reason for the system to continue to run only to build up more pressure...
  • acl10
    acl10 Member Posts: 349
    Let me know if it works

    I am thinking of changing mine to a vaporstat let me know how it goes.
  • Mark N
    Mark N Member Posts: 1,119
    Set Back

    Why not try setting back only 2 degrees to 63. Maybe you will satisfy the tstat without running excessively long. Cycling on pressure till the tstat is satisfied can't be an efficient way to run your boiler



    Mark
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