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Old 05-22-2011, 12:32 PM   #1
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Questions for Doc Holiday


Hi Doc. I've read your many posts regarding Rheem Mods and since you are the man, I have a few questions for you.

I'm thinking about DIYing adding a humidistat to enable DOD on my RGFD furnace.

1) Regarding the (sort of reddish-purple) tab on the control board which must be removed to enable DOD, can one simply grab it with needle-nose pliers and gently pull straight back?

2) What if any affect, does the h-stat have on blower speed in heating? Is it necessary to turn the stat to off, which I assume would keep the circuit closed?

3) If down the road, I wanted to remove the h-stat, would installing a jumper between R and DEHUM restore the board to its original function?

I currently don't have a humidifier, so would be wiring h-stat to R/DEHUM.

Thanks for your input.

V

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Old 05-22-2011, 12:39 PM   #2
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Questions for Doc Holiday


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Old 05-22-2011, 01:38 PM   #3
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Old 05-22-2011, 06:51 PM   #4
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Questions for Doc Holiday


A humidistat connected for DOD only has an effect on blower speed in cooling/dehumidifing mode, no effect in heat mode.
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Old 05-22-2011, 06:59 PM   #5
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I was going to say to stick his tongue across the contactor at the condenser to see if it still powers the board but what you said works.
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