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Seeking advice, new to boilers, boiler broke over winter

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  • triode
    triode Member Posts: 20
    https://forum.heatinghelp.com/discussion/comment/1893576#Comment_1893576

    This solution looks nice. Question, I am guessing I will have to break a 1/4" gas line off from the main gas inlet somewhere, as the main gas valve (controlled by S8610U #2) pilot also is controlled by S8610U #2, and therefore that pilot line will have no gas until it gets signal on TH-W from S8610U #2. Does the pilot gas valve controlled by S8610U #1 have a thermocouple to prove it has lit?

    I ask as I did not see any mention of a thermocouple connection on the V8046C1006 pilot gas valve that was mentioned. How does the S8610U #1 know when that pilot has been proven?

  • Steamhead
    Steamhead Member Posts: 18,502

    You have it backwards. Module 1 connects to the pilot terminal of the main gas valve that's already there. It sends 24V to the PV terminal on that valve. This sends gas to pilot #1, proves the flame, then sends 24V to module 2. The line to the V8046C that leads to pilot 2 is teed off the line to pilot 1, and the V8046C does not let gas go to pilot 2 at this point.

    When module 2 gets 24V, it opens the V8043C to send gas to pilot 2. Now pilot 2 gets its gas, and when it lights and flame is proven, module 2 sends 24V to the main gas valve terminal MV, and the main burners will light.

    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • 109A_5
    109A_5 Member Posts: 4,044
    edited 12:02AM

    No thermocouples.

    OK the way that @Steamhead describes is not what I envisioned drawing the last drawing. It may work the way he describes. However this returns to the unknown of 'will the Gas valve's pilot circuit support two pilots'.

    The way I drew it the autonomous pilot gas valve has it own gas source. Like repurposing the taps at the gas manual On-Off valve. So the autonomous pilot gas valve proves first, module #1. With an autonomous pilot gas valve that has it own gas source it really does not matter which actual pilot proves first, it is just becomes a matter of the sequence and MV wiring.

    As you can see there are different ways to get this done. One down side of this method is if only one pilot proves (the first) you have the equivalent of a standing pilot and no heat until it is realized some thing is wrong. Using the logical AND relay method it does not easily have that scenario, but it is more wiring.

    image.png
    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System

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