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400000 btu pool heater has flow

MarkMill
MarkMill Member Posts: 1
edited August 2019 in Domestic Hot Water
I was given a 400000 btu pool heater and replaced gas valve, control board, igniter. I ran 1.25 pipe for 50' then down to an existing .75 pipe for another 25' to the heater. Via manometer the static pressure is 7.8, however manifold pressure will not go above .5 ". My meter is a 275 CHF. I was wondering if the new gas valve was bad, but now think the meter is insufficient. The previiis heater was 260000 btu and ran ok until it died.
Thank you for any help.

Comments

  • Zman
    Zman Member Posts: 7,435
    edited August 2019
    Your meter is too small for 400K. Your gas pipe is undersized.
    This would be a good job for a pro...
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • JohnNY
    JohnNY Member Posts: 3,062
    Yeah. Pipe's too small and you don't have 400,000 BTUs available anyway.



    Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
    Consulting
    Plumbing in NYC or in NJ.
    Take his class.
  • HVACNUT
    HVACNUT Member Posts: 4,873
    The 275 meter is spec'd for, wait for it... 275,000 BTU's.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 13,165
    meter too small, pipe too small. should be 1 1/2" right up to unit
  • hot_rod
    hot_rod Member Posts: 18,279
    edited August 2019
    got enough pocketbook to feed that beast, if you do get it connected? :)

    I consider pool heaters as my mother put it when we left doors open, " I'm not paying to heat the great outdoors"
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • ChrisJ
    ChrisJ Member Posts: 13,911
    edited August 2019
    HVACNUT said:

    The 275 meter is spec'd for, wait for it... 275,000 BTU's.

    To be fair he probably didn't know 275 cubic feet per hour equals roughly 275,000 btu/h.


    Before anyone says it.
    Yes, also to be fair he shouldn't be running gas piping and hooking up appliances if he doesn't know what he's doing either.

    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
  • Zman
    Zman Member Posts: 7,435
    Unless you are at 10,000 feet with 713 btu/cf,then it is 196,075 :)

    I was not comfortable giving specific advise and having him blow his silly self up.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • JUGHNE
    JUGHNE Member Posts: 10,331
    You could possibly change to a 2 PSI system.
    NOT a DIY job.
    Might cost you 1-2 months of gas though.
    The better things in life cost money. :)