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Old 01-13-2010, 04:24 PM   #16
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Basic wiring question


Your wiring description is a little hard to follow how your connecting your wires.

using supplied transformer. presumming you don't have the automatic humidistat with freeze protection.
Generally. Wire transformer into furnace 120 volt at switch or j box.
Low voltage hot wire from transformer to hum term 1. then hum term 2 to humidistat, humidistat to solenoid, solenoid to common of transformer.

Allows for easier trouble shooting later if ever needed.

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Old 01-14-2010, 08:19 AM   #17
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Basic wiring question


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Originally Posted by beenthere View Post
Your wiring description is a little hard to follow how your connecting your wires.

using supplied transformer. presumming you don't have the automatic humidistat with freeze protection.
Generally. Wire transformer into furnace 120 volt at switch or j box.
Low voltage hot wire from transformer to hum term 1. then hum term 2 to humidistat, humidistat to solenoid, solenoid to common of transformer.

Allows for easier trouble shooting later if ever needed.
I'm sorry you couldn't follow my 'description' of proposed wiring. I didn't specifically mention, but the model number is the 'A' version. Aprilaire has dropped the A designation; it is now listed as the model 700, so I didn't include it.

I tried to copy a page from the installation manual, but couldn't. So here's a link to it:

http://www.comfortgurus.com/specs/ap...ion_manual.pdf

The only change to their wiring is that the W/G - Cf connections would be connected to the transformer secondary, but routed through the furnace 'dry' contacts.

As I mentioned, I want to avoid making active connections to the furnace board.



V

Last edited by veesubotee; 01-14-2010 at 08:20 AM. Reason: addition
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Old 01-14-2010, 12:35 PM   #18
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Basic wiring question


The CF would go to the common of the transformer.
The transformers hot would go to one side of the furnaces hum terminal, and then then other hum terminal would go to the W/G terminal of the humidistat.
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Old 01-14-2010, 03:38 PM   #19
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Basic wiring question


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Originally Posted by beenthere View Post
The CF would go to the common of the transformer.
The transformers hot would go to one side of the furnaces hum terminal, and then then other hum terminal would go to the W/G terminal of the humidistat.
Yes. I didn't know if the transformer terminals were marked. Is the secondary Common terminal so marked? In the event not, would it make a difference if the 2 wires were 'switched' (the 24V I believe is to close the humidifier relay, only)?

V

Last edited by veesubotee; 01-14-2010 at 03:48 PM. Reason: add text
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Old 01-14-2010, 03:57 PM   #20
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Basic wiring question


Generally they are marked R and C on the secondary. If not marked. it won't make a difference.

It will be used to open the solenoid, and power the humidistat.
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Old 02-05-2011, 08:53 PM   #21
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Basic wiring question


What was the outcome of the install? I have a similar situation.

I purchased the Desert Spring DS-3200. The supplied transformer is 24VAC @ 300ma.

I decided to not use the supplied transformer since the result is the drum turning 24/7. I have wired it to the W & C which is 24 volts when there is a call for heat.

Everything is working great, but is the way I set this up proper? The way I see it is the extra load is minimal but I am no expert.

I do have the HUM N & HUM H on the control board, so alternatively I could setup a receptacle for the factory transformer.

Advice?

-Lawrence
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Old 02-06-2011, 03:14 AM   #22
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Basic wiring question


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Originally Posted by veesubotee View Post
Thanks to all who responded.

Just one follow-up question: Am I correct that with NO call for heat, there would be zero (0) volts measured between W and ground?

Thanks.

V
right,no call for heat no power to w/white wire

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