differential

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    Harman Accentra: no pressure difference due to failed combustion motor?

    Hi. My Harman Accentra insert worked last year. When I tried to turn it on for the first time this year, neither the feed motor nor the ingitor came on. I pulled out the pressure switch and when i create a small negative pressure at the input I can hear the contacts close and then open again...
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    Harmon Room Temp Setpoint and Differential

    Hi, Has anyone measured the differential for the Harman room temperature thermostat? I have a P68 that I purchased in June 2014. Based on my measurements, the differential seems to be +3. In effect, three degrees above the set point. For example, at a room temperature mode setting of 60* (Set...
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