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what will match best?

newagedawn
newagedawn Member Posts: 586
in Strictly Steam
im installing a new peerless steam boiler, put new hoffman 4a quick vents on the mains
but, after i skim the boiler what type hoffman vents should i use on the radiators? i was thinking hoffman 40's , there are 3 @ 50 EDR, 3 @ 35 EDR and 1 @ 20 EDR
"The bitter taste of a poor install lasts far longer than the JOY of the lowest price"

Comments

  • BobC
    BobC Member Posts: 5,505
    The 4a may be a bit small (0.13cfm) to quickly vent the mains, it might be worth it to use more aggressive venting on the mains. How long is each main and what size pipe?

    #40's in the radiators is probably a good place to start, you may have use faster vents on any radiators that are slow to heat.

    Bob
    Smith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
    Vaporstat with a 12oz cut-out and 4oz cut-in
    3PSI gauge
    newagedawn
  • Fred
    Fred Member Posts: 8,542
    Buy Hoffman 1A's or Vent-Rite #1's for the radiators. They are adjustable and you can adjust for each radiator. As @BobC said, the Hoffman 4a is more than likely way too small for the main(s).
    http://www.hvacrsupplynow.com/VENT-RITE-1-STEAM-AIR-VALVES-ADJUSTABLE_p_1787.html
    newagedawn
  • newagedawn
    newagedawn Member Posts: 586
    there are 2- two inch mains 40 ft each
    "The bitter taste of a poor install lasts far longer than the JOY of the lowest price"
  • newagedawn
    newagedawn Member Posts: 586
    edited April 2017
    BobC@ what would you recomend for the mains?
    "The bitter taste of a poor install lasts far longer than the JOY of the lowest price"
  • KC_Jones
    KC_Jones Member Posts: 5,844
    A big mouth on each of those mains would work nicely.
    2014 Weil Mclain EG-40
    EcoSteam ES-20 Advanced Boiler Control
    Boiler pictures updated 2/21/15
  • ChrisJ
    ChrisJ Member Posts: 16,330
    I have a pair of Hoffman 4A's.

    They're too slow even for a radiator in my book, forget about using them as a main vent.

    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

    kcopp
  • Fred
    Fred Member Posts: 8,542
    Yes, a Barnes and Jones Bigmouth on each main. You can order them on the Store here on this site.
  • BobC
    BobC Member Posts: 5,505
    I agree on using the B&J Bigmouths, they have about 20X the capacity of the 4A and the rule to remember is you want to vent the mains very fast and the radiators slowly.

    Bob
    Smith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
    Vaporstat with a 12oz cut-out and 4oz cut-in
    3PSI gauge
    newagedawn
  • newagedawn
    newagedawn Member Posts: 586
    hey @ BobC, what would you recomend for the radiators
    "The bitter taste of a poor install lasts far longer than the JOY of the lowest price"
  • BobC
    BobC Member Posts: 5,505
    A lot of folks swear by the Hoffnan 40 but it really depends on your system. Because i wasn't sure what I'd need where I bought the Maid O Mist 5L that comes with 5 different orifices - 0.028, 0.10, 0.15, 0.28, and 0.34 cfm.

    http://www.essentialhardware.com/maid-o-mist-0220-5l-steam-angle-radiator-valve-kit-18-132292.html?utm_campaign=google&utm_source=google&utm_medium=cpc&gclid=CKHlxqXcmdMCFYiEswodf0kLGw

    Some find they need more adjustability at the low end so they use the VentRite 1A that offer much finer control at the low end ranging from 0.025 through 0.083 cfm. Be careful where you buy these they are sold with a wide range of prices.

    Bob
    Smith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
    Vaporstat with a 12oz cut-out and 4oz cut-in
    3PSI gauge
    newagedawn
  • newagedawn
    newagedawn Member Posts: 586
    hey @ Bobc, what is a good starting point for the maid o mist 5l
    "The bitter taste of a poor install lasts far longer than the JOY of the lowest price"
  • BobC
    BobC Member Posts: 5,505
    I'd start with the smallest orifice and work my way up in size on radiators you find slow to heat. At this time of year radiators are not going to heat up all the way across so don't be concerned with that.

    Assuming all the pipe sizes are correct and the slopes are good the goal is vent those runs with longer pipe runs and larger radiators faster than smaller radiators on shorter runs. Look at it by figuring out what the volume of air in a feeders pipe and the radiator it serves, larger totals may need faster venting.

    https://heatinghelp.com/systems-help-center/new-resource-post-9/

    The link above should give you everything you need. Just remember all systems are different and it may take a little tinkering to get you there.

    Bob
    Smith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
    Vaporstat with a 12oz cut-out and 4oz cut-in
    3PSI gauge
    newagedawn

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