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Old 12-17-2006, 01:06 PM   #1
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Aprilaire 700 to Carrier product # FK4BNF003000AAA


Hi,
I would like to hook up Aprilaire 700 to Carrier product # FK4BNF003000AAA / Model FK4BNF003 / Circuit board inside the furnace CES0130007-00.
My previous Aprilarie 110 broke down.
Aprilaire 700 requires three sets of wires : two wires from Humidistat -> furnace, two wires from Humidistat -> humidifier, two wires from Humidistat -> ouside the house for sensor.
I don't know how to hook up from Humidistat to furnace.
Inside Carrier furnace circuit board, 24VDC is printed above HUM1, HUM2. The manual of Carrier furnace said (24VDC) : HUM1 -> Humidistat -> humidifier; HUM2 ->humidifier.
Should I use both HUM1 and HUM2 for Humidistat to furnace directly (without go to humidifier) ?
Is it OK to use 24VDC when Aprilaire 700 requires 24VAC ?
RED wire is from Humidistat port R
WHITE wire is from Humidistat port C
Should the RED wire go to HUM1 and WHITE wire go to HUM2 ?
Thank you. Mag.
The first picture is Circuit board inside the furnace.
Second picture is zoom in HUM1, HUM2.

Attached Thumbnails
Aprilaire 700  to Carrier product # FK4BNF003000AAA-p2.jpg   Aprilaire 700  to Carrier product # FK4BNF003000AAA-p1.jpg  

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Old 12-17-2006, 02:55 PM   #2
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Aprilaire 700 to Carrier product # FK4BNF003000AAA


Hi mag-md

You have a pretty simple set up. You will need to wire your humidistat side to the hum1 and hum2 terminals. The 24 volt hot continuous can be wired to the R and C terminals on the board. The outdoor sensor should be its own circuit going strait to the controller for the humidifier. Just remember when you hook up to the Hum terminals that hum1 is 24 volts hot and hum2 is 24 volts common or neutral. If you need any further help, let us know.

Good luck
Rusty

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Old 12-17-2006, 03:30 PM   #3
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Aprilaire 700 to Carrier product # FK4BNF003000AAA


the correct way to power that paticular unit is to power off of the 24 volt tranformer supplied with the humidifier. the transformer should be powered off of HUM 120 hot and HUM 120 NEUTRAL. Then every time the blower is on in the heating mode the transformer is powered up. Take your two wires from the low side of the transformer to R and C on the humidistat, and the other two to the valve. This is the correct way per the manufacture of the humidifier.
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Old 12-17-2006, 04:31 PM   #4
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Aprilaire 700 to Carrier product # FK4BNF003000AAA


Thanks for your responses.
So you're both saying that I should hook up the humidistat R to HUM1 and humidistat C to HUM2, right?
Thanks.
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Old 12-17-2006, 04:49 PM   #5
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Aprilaire 700 to Carrier product # FK4BNF003000AAA


NO!

the correct way to power that paticular unit is to power off of the 24 volt tranformer supplied with the humidifier


the transformer should be powered off of HUM 120 hot and HUM 120 NEUTRAL (on your main board)
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Old 12-17-2006, 05:21 PM   #6
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Aprilaire 700 to Carrier product # FK4BNF003000AAA


Guys. Jocking aside.
The furnace's circuit board doesn't have a HUM 120.
Here's what I think about the humidifier problem:
The Aprilaire 700 humidifier is powered by 110V AC that goes into the wall outlet. The humidifier has two brown wires that should connect to the two H terminals on the humidistat. The humidifier doesn't have any other cables coming out of it that I can use (I'm not going to rewire the two yellow wires that connect the humidifier to its' water valve:-)
Now the manual shows various pictures/scenarios that connect the R port of the humidistat controller to the furnace's HUM(24V). So this should be HUM1, right? And the same pictures/scenarios connect the C port of the humidistat controller to the furnace on port C (Com). So based on your descriptions the corresponding port C (Com) in my furnace should be HUM2, right?
Thanks.
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Old 12-17-2006, 06:00 PM   #7
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Aprilaire 700 to Carrier product # FK4BNF003000AAA


yes HUM1 is 24VAC Hot and HUM2 is Common
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Old 12-17-2006, 06:09 PM   #8
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Aprilaire 700 to Carrier product # FK4BNF003000AAA


Thanks, rakes9720.
BTW The picture of the furnace's circuit board (from my initial post) show HUM1, HUM2 as 24VDC. However, the Aprilaire 700 specifies 24VAC. Should I be concerned about this?
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Old 12-17-2006, 06:35 PM   #9
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Aprilaire 700 to Carrier product # FK4BNF003000AAA


Did the unit come with a 24 v transformer?
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Old 12-17-2006, 07:11 PM   #10
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Aprilaire 700 to Carrier product # FK4BNF003000AAA


No, the Aprilaire 700 unit doesn't come with a 24V transformer. The wiring diagram shows that the R/C terminals from the humidistat should go to either 24VAC furnace accessory terminals (2VA minimum) or 24 VAC transformer (2VA minimum).
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Old 12-17-2006, 07:49 PM   #11
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Aprilaire 700 to Carrier product # FK4BNF003000AAA


Thats odd..........I have bought and installed thousands of them and everyone has always came with one. Anyhow.........if you measure 24 VAC between the two teminals you want to use while the furnace is in the heating mode and the blower is running then you should be fine.

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