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Rinnai combi boiler

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kdumais
kdumais Member Posts: 1
in THE MAIN WALL
I have a Rinnai 120 combi boiler running on propane 

we started it up but it won’t stay running unless I cover 50 % of the air intake   Any 
suggestions?

this is a new install 

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  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,520
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    Did someone do a combustion test?

    Is it natural gas or LP gas?

    Is it set up for the right fuel?
    kcopp
  • kcopp
    kcopp Member Posts: 4,432
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    Need to get a combustion tool on that to figure out what the settings should be at...
  • hot_rod
    hot_rod Member Posts: 22,131
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    Is the intake piping about the same length as the exhaust. And they should exit about the same place, same pressure zone

    If you are pulling inside air directly into the boiler without any piping, you often do need to choke down the intake a bit.

    I’ve got my intake about 1/2 covered to get the combustion numbers in the acceptable range,on LP
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream

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