Aprilaire 600 to Trane xv90 furnace

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Old 11-30-09, 04:08 PM
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Post Aprilaire 600 to Trane xv90 furnace

Hello
I have installed a new Aprilaire 600A humidifyer to my Trane XV90 furnace. An existing 24 volt transformer was used from an older unit that was installed already in the furnace. Im confused about humidifyer wiring especially W/G and Cf on the humidifyer the directions say connect them to a terminal strip to W and common. I can not find this strip in the xv90. Should I just jumper off the R and C terminals on the humidifier because they are 24 volts. Currently I have mounted the new humidifier and control panel. The control will light up it display but the solinoid is not working because no voltage too it. Im really confused please help its getting dry here.
Thank You
 
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Old 12-01-09, 08:02 AM
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Do you know if the transformer on the furnace is wired up to the HUM wire? (Or EAC)

If not sure, does the transformer power up when the furnace calls for heat, then shuts off when heat is not called for?

If not, I would suggest to wire it like this.

Transformer wired to HUM wire.

R and C from the control to the transformer.

Then W/G goes to R on the board that is in the blower area. The house t-stat is wired to this area.. (W1. W2.. ect..)

Then Cf goes to C/B on the board on the furnace.

Do you have a two stage t-stat hooked up to this furnace?
 
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Old 12-01-09, 05:33 PM
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Thanks
The transformer does power up when the furnace calls for heat it also shuts off when heat is not called for.

My T-stat though is a single stage old Honeywell.

Thank you
 
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Old 12-01-09, 07:35 PM
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Do you know if you have extra unused wires in the wall? If you do I would suggest looking at upgrading the t-stat to a two stage stat, and you'll get a better comfort out of.
 
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Old 12-14-09, 12:37 PM
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Aprilaire 600 to XV90

Hi Jay
I finnaly got the time to do this. My terminal block in the furnace reads TWIN,G,W2,W1,B,Y,R. I know that W/G from humidifyer needs to go to R but does C/f from humidifyer actually go to B terminal on the furnace. I do not see a C/B as suggested on the terminal block. Thank you so much for your help.
Sam
 
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Old 12-14-09, 03:25 PM
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My bad.. I must of been tired that night.


R goes to R on the board.
C goes to B on the board.

W/G goes to transformer---HUM
Cf goes to transformer----Com


Did you see if you have extra wire in the wall to upgrade the t-stat to a two stage stat?
 
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Old 12-15-09, 03:13 PM
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Complete Success

Jay
Thank you so much for your help. It has been complete success the humidifier works great. Learned allot from this experience. I would like to upgrade my t-stat to a two stage what you recomend. I still need to look at my wiring at the t-stat.
Thanks again
 
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Old 12-15-09, 08:01 PM
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Thanks for the update, and glad to hear it's all working out.


As for the t-stat. I would suggest the following.

Retail stats sold at Home Depot is Honeywell RTH7500, or Touch screen RTH7600.

For pro models that can be found online are Honeywell FocusPro TH6220, or VisionPro touch screen TH8320.

Do you have extra wires in the wall?

You'll need 5 or 6 wires in the wall.
 
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