Rheem furnace schematic doesn't seem to match actual circuit board
 

I have a Rheem furnace model number GF801U125AS60. It was installed as a
brand new unit 2 years ago. I am now trying to hookup the old
humidifier(Aprilaire) to the furnace. The schematic on the furnace door
shows a HUM relay, but I do not have or can't find a HUM terminal on the
board. I have an L1, Neutral, M1, EAC, Heat, Cool.
Is the HUM terminal in a location that is not obvious? If no HUM terminal
I assume I need to purchase the relay?

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Rheem furnace schematic doesn't seem to match actual circuit board
 

On Wednesday, December 17, 2014 10:44:05 PM UTC-6, Paint wrote:
I have a Rheem furnace model number GF801U125AS60. It was installed as a
brand new unit 2 years ago. I am now trying to hookup the old
humidifier(Aprilaire) to the furnace. The schematic on the furnace door
shows a HUM relay, but I do not have or can't find a HUM terminal on the
board. I have an L1, Neutral, M1, EAC, Heat, Cool.
Is the HUM terminal in a location that is not obvious? If no HUM terminal
I assume I need to purchase the relay?

--

http://globalimageserver.com/fetchDo...0-ec353620f65b

Right, no HUM terminal on upflow models.
Might find an adapter, I don't know.
Good luck.

Rheem furnace schematic doesn't seem to match actual circuit board
 

On Wednesday, December 17, 2014 11:44:05 PM UTC-5, Paint wrote:
I have a Rheem furnace model number GF801U125AS60. It was installed as a
brand new unit 2 years ago. I am now trying to hookup the old
humidifier(Aprilaire) to the furnace. The schematic on the furnace door
shows a HUM relay, but I do not have or can't find a HUM terminal on the
board. I have an L1, Neutral, M1, EAC, Heat, Cool.
Is the HUM terminal in a location that is not obvious? If no HUM terminal
I assume I need to purchase the relay?

--

EAC is electronic air cleaner. I think that's typically 120V, not 24V,
but it may vary depending on furnace. I think Aprilaire wants 24V.
so, if it's 120V, you;d need a Xformer.
Also, EAC will be active whenever blower is on, so humidifier either
needs to be manually turned off in summer or have an outdoor temp
sensor, in which case the Aprilaire I have turns off itself.

You could probably just connect it to the heat call terminal too.
They don't tell you to do that, because I think they are concerned
about placing the additional small load of the humidifier onto
the furnace Xformer when they don't know it's rated capability
and they figure it's too complicated for installers to figure out.