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Secondary pressure limit?

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Home Depot Employee
Home Depot Employee Member Posts: 329
in THE MAIN WALL
You would use the H/W L4079B1033 (2-15 PSI) which has a manual reset.
I would set at about 7-8 PSI, which is under relief valve setting to prevent nuisance tripping if boiler surges or partially floods.

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  • Big_Al
    Big_Al Member Posts: 20


    My steam boiler at home cycles between 1/2 and 2 PSI, which is at the bottom end of the Pressuretrol installed on it. It also has a 10 PSI relief valve . . . but no secondary overpressure switch to shut it down if the Pressuretrol fails. In an industrial setting, I don't think this would be allowed . . . or at least I wouldn't want it that way.

    Should I install a secondary, manual-reset limit switch, maybe set at 3 or 4 PSI? If so, could somebody recommend a part number. I'm finding the on-line Honeywell catalog information to be a bit vague.

    Thanks again!
  • Big_Al
    Big_Al Member Posts: 20


    Perfect! Thanks!
  • Big_Al
    Big_Al Member Posts: 20
    OK, now I have one - sort of.

    Money is a little tight after all the major repairs I've done on my antique home this year, so I'm leaning toward saving myself a couple hundred bucks.

    I got a couple of working Honewell PA404A Pressuretrols for $5 on eBay. They aren't manual reset, but they do operate in the 0-10 PSI range. I'm thinking I'll install one in conjunction with what I have, and just set it a little higher. Since it's not manual reset, I'll need to check it once in a while to make sure everything is working right, but it should give me that little extra measure of safety.

    Am I nuts? Comments?
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