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new high limit failure?

Kal Row
Kal Row Member Posts: 1,520
in THE MAIN WALL
they had wired the boiler's 110v supply, to the system demand control - so if the demand was satisfied - the boiler and it's pump was shut of abruptly with no way to purge the residual heat out of it, if it had just gotten to 180, thus the trip – I would have seen it right away – but it’s one of those “rat’s nest” boiler rooms that make you dizzy just looking at it!!!

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  • Kal Row
    Kal Row Member Posts: 1,520
    new high limit failure?

    got a brand new IBR 8900 series (630kbtu), that keeps tripping the high limit,


    -the high limit (on boiler's discharge) is set for 200f

    -the aquastat (on boilers return) is set for 170

    -the installed paddle switch is working correctly and indicating good flow

    -the system is piped primary/secondary

    -the boiler pump has sufficient gpm and head to get the BTU’s to the close-T's

    -the tridicators on the boiler’s return and discharge ports never get past 180

    -there is no appreciable pressure differential between the two that would indicate a flow restriction

    -the system is purged of air


    how many of you have experienced a new high limit failure – as this would be a first for me
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