HE360A H8908B Wiring on First Co. Air Handler

Complete rookie here...

The HE360A is installed on the supply duct and the H8908B is installed on the return duct as described in the manual. Water is hooked up and it is ready to go - except for the wiring.

I have checked that the humidifier works by connecting the two yellow wires.

It is installed on a First Co. 48MBXB-HW air handler (http://www.firstco.com/products/mbxb_hw.asp). It has four leads coming out of the side, all capped.
Two are orange and marked "24V" and the other two purple and marked "T".

How do I hook this up without using the sail switch?

Do I need the A50 current sensing relay that I have seen in other postings? If so, how is that wired to my system?

This is my second unit (fried the first one because I used the red/orange wires.

Thanks
/Martin

 

The install manual for that company sure didn't say much...

You are going to need an A50 Relay.

What is your heat souruce?

One yellow wire from humidifer to humdistat.

Other wire from humidistat to A50 relay.

Other wire from relay back to humidifier.

A50 relay on your White wire on the blower motor.

 

The heat source is oil, and I believe my neighbor called my system a hydro system!?

I'll go get an A50 relay. I presume I'd have to open the air handler to get to the wire!?

I'll take a picture and post for verification.

/Martin

 

Oh yeah, You have a hydro coil. you have radiatior?

Will be waiting for the photo's.

 

My computer skills are apparently lacking as well, for some reason I can't upload the pictures.

When I look at the wiring diagram inside the air handler, it appears that the fan motor is fed by a white N/L2 and a black "HI" and a blue "LO".

From looking at the wiring diagram, it looks like the fan motor is fed 120V.

Do I need the A50 or A51 relay then?

/Martin

 

A50 is what you need.

The 51 if you were doing line voltage, the humidifier is 24 volts.

 

I have the A50 relay and wrapped it around the white wire going to the blower motor. The humidifier kicks in fine when the blower starts up, but for some reason it doesn't turn off when the blower stops. Have I wired it wrong?

Thank you for all your help in steering me onto the A50 relay, it looks like I am on right track, now I just can't get it to turn off.

 

Is it wrapped on the blower's white wire?

Take a photo if you can.

 

Finally, I got it to work. It's spinning up and down.

I guess I had the A50 relay too close to a transformer, so it didn't de-energize once the blower turned off.

Thank you very much for your help and guidance. I'm prepared to go install the other two I have bought.

Happy Holidays

 

Great!


They are not in the attic are they?

Thanks! And wish you and your family a Merry Christmas!