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Super store off steam boiler

Bill Julian
Bill Julian Member Posts: 162
in Domestic Hot Water
What are the parameters for installing a super Store 35 off a SGO-3. The tankless is history.

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,295
    Finding the right tapings to connect to, The return from the superstore should go into the condensate return and not directly into the boiler. The supply should come off just below the normal boiler water line around the height of the lower gauge glass taping. Using the right size pipe (usually 1", not 3/4").

    Using a bronze pump is essential.

    I am sure their is a piping diagram with the superstore
  • Bill Julian
    Bill Julian Member Posts: 162
    Cool thanks
  • mattmia2
    mattmia2 Member Posts: 10,763
    Looking at this SSU manual that may have been sitting on my coffee table for 3 years, it does show a steam boiler condensate application although it is missing the note about it needing to be nonferrous.
  • kcopp
    kcopp Member Posts: 4,462
    Ill say this. You can pipe an indirect water heater off a steam boiler. I have done it a couple of times. However I dont think I would do it again. Too many water quality issues where the coil can mud up. The boiler has to heat up daily to make hot water and steam boilers are not the most efficient.
    Unless electric rates are nuts I would suggest a good electric tank or a heat pump water heater.
  • Bill Julian
    Bill Julian Member Posts: 162
    I hear the comments but electric is not an option and she has no NG. Another question. The relay wiring.
    120 to relay, cir cc, control from SS to TT, and the question is XX?? How does the boiler call when the SS calls? On the SGO-3 where is the wiring connection related to the call from the SS when heat is not calling?
  • kcopp
    kcopp Member Posts: 4,462
    TT from the relay to the burner TT
  • Bill Julian
    Bill Julian Member Posts: 162
    Ok, What of XX?
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,295
    The control on the Superstore has to do 2 things, start the burner and the circulator
  • mattmia2
    mattmia2 Member Posts: 10,763
    Ideally it wouldn't start the circulator until the boiler is hotter than the tank so the tank isn't heating the boiler.
  • HVACNUT
    HVACNUT Member Posts: 6,239
    Bill Julian said:
    Ok, What of XX?
    What relay do you have that has XX?
    That's usually on a zone panel with 2 or more zones.
    For a single zone relay you can use something like the diagram below. Just wire your existing steam thermostat wires in parallel with 5 and 6 on the relay.
    Whatever you do, make sure you don't bypass the line volt safety circuit to the burner. 
    What aquastat was being used for the tankless? That will still be limit for the indirect so you dont start making steam. 160° limit with a 10° diff should be fine IMO.
    And when piping, if SS doesn't spec it, a wye strainer or two and isolation valves for it and the circulator will make it easier if there's trouble down the road. 
  • Larry Weingarten
    Larry Weingarten Member Posts: 3,564
    Hi @Bill Julian ,You say electric is not an option. The major water heater manufacturers are all working on 120 VAC heat pump water heaters, and have prototypes. They will clearly be on the market soon. Any chance your client can wait a bit for this technology? It will probably cost her less in the long run.

    Yours, Larry
    PC7060
  • Bill Julian
    Bill Julian Member Posts: 162
    HVACNUT My Bad the relay is a 501 single Taco like the one above. Didn't get a visual on the Aqua Stat. Your words sound right
  • JohnNY
    JohnNY Member Posts: 3,287
    If you have an X-X terminal on your relay, that goes to your T-T on the boiler. The dry XX closes on any activation of the relay.
    Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
    Consulting & Troubleshooting
    Heating in NYC or NJ.
    Classes
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,295
    Honeywell has a switching relay it's a two pole relay 3 &4 switch the 120 volt and X & X switch 24 volt. They used to be used on millivolt systems. Forgot the # maybe that is what the op has.
  • Bill Julian
    Bill Julian Member Posts: 162
    Yea I get it. The gold-3 and the SSU
    HVACNUT
  • mattmia2
    mattmia2 Member Posts: 10,763
    If you have an existing tankless coil you could use that as a hx and set up the ssu as a closed system and not need the nonferrous components
  • Bill Julian
    Bill Julian Member Posts: 162
    In what way? wiring wise
  • HVACNUT
    HVACNUT Member Posts: 6,239
    mattmia2 said:
    If you have an existing tankless coil you could use that as a hx and set up the ssu as a closed system and not need the nonferrous components
    An Aquabooster vs an indirect off a coil on a steam boiler would be cheaper and no less efficient. As long  as the coil has good flow anyway. 
    mattmia2
  • Jamie Hall
    Jamie Hall Member Posts: 24,572
    A minor comment for the unwary... if the pressure regulator is present (see the drawing), the expansion tank is not optional. You have to have it.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Bill Julian
    Bill Julian Member Posts: 162
    No Im dumping the tankess altogether

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