Humidifiers and Dehumidifiers - Bypass connection length

I have Lennox g43uf-36b furnace and 'am planning to install GeneralAire 1042 humidifier. I want to connect the humidifier to HUM and one of the NEUTRALS. My present thermostat has to H connection, but there is no wire for that connection. What kind of wire do I need to connect it to humidifier. At present there is a brown wire with (I guess) 4 conductors is going from T-stat to furnace.

Second question is, due to space and width restrictions I have to connect the humidifier on wider portion (side) of return duct, so it'll be on the other side from the furnace. How far can I go before really compromising the efficiency? (I hope I have made it clearer). Can I hook it up on narrow side, what do I need for that?

Thanks!

I have Lennox g43uf-36b furnace and 'am planning to install GeneralAire 1042 humidifier. I want to connect the humidifier to HUM and one of the NEUTRALS.
are you putting a transformer on this?


My present thermostat has to H connection,
What is the make and brand of t-stat is this?


Second question is, due to space and width restrictions I have to connect the humidifier on wider portion (side) of return duct, so it'll be on the other side from the furnace. How far can I go before really compromising the efficiency?
As long you use the ridged pipe, you are fine.


Can I hook it up on narrow side, what do I need for that?
Is the side larger than the opening size of the humidifier itself?

are you putting a transformer on this??

I don't think, I have to because HUM is 110 Volts and I think the humidifier is 110 volts too (Haven't bought it yet, just read about it. Wanted to get my plan ready before getting to execute it)


What is the make and brand of t-stat is this?

Its NOMA, don't have the model number handy. Its from Canadian Tire though.

As long you use the ridged pipe, you are fine.

Do you mean the same kind as duct work.

Is the side larger than the opening size of the humidifier itself?

Again, I have just read about the opening. Its 10.25" (W)x 9.5" (H) and the side is just about 10" wide, but its 25 inch long on the other side, where I am planning to install it.

I don't think, I have to because HUM is 110 Volts and I think the humidifier is 110 volts too (Haven't bought it yet, just read about it. Wanted to get my plan ready before getting to execute it)
That is a 24 volt model, and the transformer is needed. (It may come with it)


Its NOMA, don't have the model number handy. Its from Canadian Tire though.
I am not aware of that brand, but do let me know what the model is.. Chances are, you are going to need a A50 relay since the t-stat don't know when the fan is going or not.



Do you mean the same kind as duct work.
Yes, the metal duct, not the foil type.

That is a 24 volt model, and the transformer is needed. (It may come with it)
There are 3 models of it; 1042, 1042 Low Voltage and 1042 Low voltage with Humidstat. I'll be getting regular 1042. But yes the low voltage comes with transformer

I am not aware of that brand, but do let me know what the model is.. Chances are, you are going to need a A50 relay since the t-stat don't know when the fan is going or not.
Its Noma THM501 Canadian Tire (http://www.canadiantire.ca/browse/product_detail.jsp?FOLDER%3C%3Efolder_id=1408474396676721&bmUID=1237993463263&PRODUCT%3C%3Eprd_id=845524443276959&assortment=primary&fromSearch=true)

Manual - Programmable Thermostats - THM501 (http://www.upm-marketing.com/products/ProductDisplay.cfm?CFID=9403867&CFTOKEN=49319247&pt=%21%28%20%20%20%0A&rtRn=484%263O%5E%5F%3A29VU%5B%5ERP%3D%5BY6%226N%22W%5EL%20%0A&item=%22%28%204%20%0A)

My T-stat know whether the fan is on or not, it shows on it.


Yes, the metal duct, not the foil type.
Great! But will the length of bypass duct affect the performance of humidifier?

There are 3 models of it; 1042, 1042 Low Voltage and 1042 Low voltage with Humidstat. I'll be getting regular 1042. But yes the low voltage comes with transformer.
Get the low voltage, the t-stat will only work with low voltage.


My T-stat know whether the fan is on or not, it shows on it.
The fan stats on the t-stat has nothing to do with the humidifier.. Reading the stat's manual, looks like it will power up the humidiifier on call of heat.

H1 and H2 will go right to the two low voltage wire on the humidifier.


Great! But will the length of bypass duct affect the performance of humidifier?
Nope, as long it get a good smooth route from point A to B, you are good.

Get the low voltage, the t-stat will only work with low voltage.

So you mean I won't be able to hook it up to HUM port or I have to use transformer to connect it to HUM, correct?

H1 and H2 will go right to the two low voltage wire on the humidifier.

H1 and H2 are the points where you would connect a h-stat, according to manual. It shouldn't affect if the humidifier is regular voltage or low voltage, right? Which brings us to point one above. (Pardon my ignorance, I guess I should read more)

The fan stats on the t-stat has nothing to do with the humidifier.. Reading the stat's manual, looks like it will power up the humidiifier on call of heat.

You are right, I read it too.

You will need to wire up the transformer to the 120v HUM on the furnace board.

Then one of the wire from the low voltage side of the transformer goes up to H1 on the t-stat.

Other H2 goes down to one of the wires on the humidifier.

Other wire from humidifier goes to the transformer.

You will not need humidistat that comes with the humidifier, the t-stat will take care of it.

The t-stat is only rated for low voltage, so that's why I say you need the 24volts model humidifier.

Great!

Thanks a bunch for the clarification.

I'll get the low voltage version and I'll be installing it in next few weeks.

Thanks again

Keep up the good work! :thumbup: Beer 4U2

Glad to help out..

If you have any questions, feel free to come on back!

I have got low voltage humidifier now and have done the wiring from t-stat to furnace.

Only question is that my bypass connection from humidifier side won't be in level with furnace side (AC coils get in the way on furnace side and I don't have 'nuf room on return side to keep it level). Does it matter?

(I am going to use rigid 6inch pipe for connection)

Thanks!

It don't need to be leveled. You can go up, down, left, right, or whatever to get to where you need to go.

Thanks a bunch!

Will get it done this weekend!

It's done and it works too . . . lol

Thanks for all your help!

LOL Glad to hear it works, and thanks for the update!