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Why does the pump discharge piping on my Mitsubishi indoor unit bend up before draining?

aston01 | Posted in Mechanicals on

I’ve been wondering for a while why the drain piping off of the condensate pump bends up ~6in before it turns back down to drain. Mitsubishi’s install manual shows it looking just like the attached photo.

Can anyone provide insight on why this is piped like this?

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  1. greenright | | #1

    So the pump is always primed… otherwise partial submerge of impeller will result in cavitation and loss of pressure and flooding of the ahu

  2. Expert Member


    As a Christmas gift to those of us with mild OCD, could you please finish cutting off the top of that pipe wrap insulation?

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