Aprilaire 500 wiring to new heat pump & oil furnace.

Installed a Gree heat pump and am trying to hook up aprilaire 500m with model 60 humidifier control. Furnace is a tempstar amp105-ie2 oil furnace with oil being backup heat. Current thermo is a honeywell rth7600d. I cannot figure the wiring out. Can i just tie into reversing valve (b/0) instead of using W. W- should only work if I'm in emergency heat. Also customer (my wife) wants hot water to humidifier. Is this a must....? its a very long run.

 

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You can get your R and C from the fan center.
You can't use the reversing valve line is that is always active when in heating mode.

The easiest thing to do is to get the Aprilaire A-50 controller.
Aprilaire A-50 on special

The blower motor neutral wire runs thru the metal clip on the A-50.
When the blower runs.... it turns on and activates the humidifier.
If you didn't want to set the transformer... you could get solenoid power from R and C terminals.


Unfortunately you do not get the most effective humidity output from a heat pump system with cold water. Hot water is definitely more effective. A long hot water line is not helpful either. Humidifiers don't use a lot of water so by the time the hot water reached the humidifier it would be shutting off. It would require insulating the line if hot water is used.

 

Thanks for the input. A tech told me to wire it to G instead of white and keep the fan on auto and in the summer turn off the controller, will that work as well? I am trying that today. I am running the hot water line....and insulating. I hope that helps a little.

 

G can't be used in dual fuel setups.
The heat pump will activate the G terminal but the oil furnace will not.
G is typically a faster blower speed than required for a fossil furnace.