Aprilaire 700 wiring

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Old 12-18-11, 07:35 PM
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Aprilaire 700 wiring

I have installed a 700 with manual control. Humidifier is connected to 120 VAC via plug. R connector on furnace to Humistat to humidifier. C connector on furnace directly to humidifier. Works except it does not turn off when the is no call for heat. We leave blower motor on, so is it is a problem if it does not turn off when there is no call for heat?
We have a two-stage gas HEIL furnace with a programmable thermostat. Wires between stat are furnace are:

Furnace post Stat post
R R
C C
W1 W1
G G
W2 W2

The furnace does not have a hum post on the 24v side only a Y2 for a dehumidifier.
Is it possible to connect the humistat to a different post than the R on the furnace to have it activate only when there is a call for heat? Or is the heat sensing relay the only way?
Thanks for the help
 
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Old 12-18-11, 08:01 PM
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You can move it over to W1 from R.

What's the model # on your furnace?
 
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Old 12-19-11, 05:35 PM
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The model number is H9MPT125L20B1
 
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Old 12-19-11, 06:15 PM
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Looking at the install manual, on page 39, FIG 35, there is 24v HUM hook up on the board.
 
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Old 12-19-11, 08:00 PM
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Our control board is different than the diagram. Our furnace was installed in 2006. i will try the W1 connection tomorrow night.
 
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Old 12-20-11, 06:31 AM
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Ok..

If for some reason the furnace starts acting up, we may have to wire up a transformer to the furnace EAC hook up on the board.
 
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