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    These are burning out at different places...

    These are burning out at different places throughout the 4 story structure. I don't find any voltage problems. The dampers are shutting and the boxes are zeroing out before startup. I have not...
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    1,582

    enviro-tec VAV speed control

    I have quite a number of VAV boxes and all have speed control on them. All are 277volt and have model ETFC277-8 speed control boards. the problem is that the resistor and part Q2 keeps burning out....
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