Humidifiers and Dehumidifiers - HE360A wiring to old furnace
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Bill02
01-20-08, 08:54 PM
I have an HE360A with H8908B..
I don't seem to have any appropriate (EAC etc.) 120v connections in my 1988 Heil NUGI125DH03 furnace.
Based on what I've read here so far, it sounds like I need to wire a 120v outlet to the main incoming 120v power to the furnace, then wire the yellow switch leads of the HE360 through the humidistat and an a50 relay on a 24v wire in the furnace. Does this sound correct?
If so, where can I get an a50 relay and how much should it be?
The idea of a sail switch sounds fairly silly..
Almost certainly dumb question, but since the switched circuit (yellow wires) in the humidifier is 24v, would it be possible to wire around the 24v transformer in the humidifier and connect direct to the 24v leads on the furnace control board? i.e. provide the 24 volts from the furnace instead of the humidifier? (I'm assuming there is some reason you cant do this, just not sure what that is..)
fwiw, my old furnace has a Honeywell S8600M control board in it.
--Bill
I don't seem to have any appropriate (EAC etc.) 120v connections in my 1988 Heil NUGI125DH03 furnace.
Based on what I've read here so far, it sounds like I need to wire a 120v outlet to the main incoming 120v power to the furnace, then wire the yellow switch leads of the HE360 through the humidistat and an a50 relay on a 24v wire in the furnace. Does this sound correct?
If so, where can I get an a50 relay and how much should it be?
The idea of a sail switch sounds fairly silly..
Almost certainly dumb question, but since the switched circuit (yellow wires) in the humidifier is 24v, would it be possible to wire around the 24v transformer in the humidifier and connect direct to the 24v leads on the furnace control board? i.e. provide the 24 volts from the furnace instead of the humidifier? (I'm assuming there is some reason you cant do this, just not sure what that is..)
fwiw, my old furnace has a Honeywell S8600M control board in it.
--Bill
Jay11J
01-21-08, 09:32 AM
I have an HE360A with H8908B..
I don't seem to have any appropriate (EAC etc.) 120v connections in my 1988 Heil NUGI125DH03 furnace.
Yeah, there is nothing on that age of unit.
Based on what I've read here so far, it sounds like I need to wire a 120v outlet to the main incoming 120v power to the furnace, then wire the yellow switch leads of the HE360 through the humidistat and an a50 relay on a 24v wire in the furnace. Does this sound correct?
Correct, or just plug the 120 into near by outlet.
If so, where can I get an a50 relay and how much should it be?
YOu can find them anywhere on line, search for it.. You will not have a good chance of finding them in retails stores.
The idea of a sail switch sounds fairly silly..
It works... Just has a higher chance of sticking over time from dust in the air.
Almost certainly dumb question, but since the switched circuit (yellow wires) in the humidifier is 24v, would it be possible to wire around the 24v transformer in the humidifier and connect direct to the 24v leads on the furnace control board? i.e. provide the 24 volts from the furnace instead of the humidifier?
There is a built in board/transformer inside the unit. so don't wire it to another power source, can/may burn out both transfromer.. Seen it happen on here!
I don't seem to have any appropriate (EAC etc.) 120v connections in my 1988 Heil NUGI125DH03 furnace.
Yeah, there is nothing on that age of unit.
Based on what I've read here so far, it sounds like I need to wire a 120v outlet to the main incoming 120v power to the furnace, then wire the yellow switch leads of the HE360 through the humidistat and an a50 relay on a 24v wire in the furnace. Does this sound correct?
Correct, or just plug the 120 into near by outlet.
If so, where can I get an a50 relay and how much should it be?
YOu can find them anywhere on line, search for it.. You will not have a good chance of finding them in retails stores.
The idea of a sail switch sounds fairly silly..
It works... Just has a higher chance of sticking over time from dust in the air.
Almost certainly dumb question, but since the switched circuit (yellow wires) in the humidifier is 24v, would it be possible to wire around the 24v transformer in the humidifier and connect direct to the 24v leads on the furnace control board? i.e. provide the 24 volts from the furnace instead of the humidifier?
There is a built in board/transformer inside the unit. so don't wire it to another power source, can/may burn out both transfromer.. Seen it happen on here!
Bill02
01-28-08, 07:19 AM
Sorry for the delay..
I was able to find a local HVAC contractor with an A50 in stock at a reasonable price, and got everything hooked up.
The only confusion in my original plan was the location of the A50. It needs to be sensing 120V, not 24V, so I connected it to the common lead of the blower motor itself, as per the instructions, rather than a 24v line off the control board.
For anyone else suffering the same confusion, the A50 completes a 24V circuit, but it does so by sensing current in a 120V line, not 24V.
Anyway, everything is working great.. Now I just wonder if I should have waited for (got?) the steam one..
--Bill
I was able to find a local HVAC contractor with an A50 in stock at a reasonable price, and got everything hooked up.
The only confusion in my original plan was the location of the A50. It needs to be sensing 120V, not 24V, so I connected it to the common lead of the blower motor itself, as per the instructions, rather than a 24v line off the control board.
For anyone else suffering the same confusion, the A50 completes a 24V circuit, but it does so by sensing current in a 120V line, not 24V.
Anyway, everything is working great.. Now I just wonder if I should have waited for (got?) the steam one..
--Bill
Jay11J
01-28-08, 08:11 AM
Thanks for the update Bill, and glad to see that you found one in your area.
.. Now I just wonder if I should have waited for (got?) the steam one..
--Bill
You're not the only one... I'm in the same shoes as you are... But water here in Rochester is pretty cheap, I figured my water use in dollars wise, and for the heating season cost us about $7. Did the math, would take me 14 years to break even.... Gallon wise, oh.. LOTS of water would be saved..I don't want see the numbers on that.
.. Now I just wonder if I should have waited for (got?) the steam one..
--Bill
You're not the only one... I'm in the same shoes as you are... But water here in Rochester is pretty cheap, I figured my water use in dollars wise, and for the heating season cost us about $7. Did the math, would take me 14 years to break even.... Gallon wise, oh.. LOTS of water would be saved..I don't want see the numbers on that.