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# connecting common wire from furnace?

#1
11-07-18, 07:51 AM
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Join Date: Jun 2017
Posts: 5
connecting common wire from furnace?

Hi,

I would like to know where to get the common wire power for the thermostat.
I have attached the furnace diagram.

I can see the that a 24V constant on the red/pink cable on the furnace picture.

Can I connect the blue wire to it to get a constant power?

Last edited by PJmax; 11-07-18 at 10:10 AM. Reason: added labeled picture
#2
11-07-18, 10:11 AM
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Location: Northern NJ - USA
Posts: 59,139
Can I connect the blue wire to it to get a constant power?
Yes..... the B/C is common and the R is 24vAC.

#3
11-08-18, 06:11 AM
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Join Date: Jun 2017
Posts: 5
thanks for the reply. Let me restate the question since I did not understand what the system is asking.

Does the common wire have 24V (hot) ?
"common wire (B) - provide return path for R " which mean I should be connecting my blue wire to the B/C terminal, right?

Last edited by nghian_2003; 11-08-18 at 09:06 AM.
#4
11-08-18, 10:18 AM
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Join Date: Jun 2017
Posts: 5
I got the thing working now once I understand what it is asking.

#5
11-08-18, 03:31 PM
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Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 59,139
Sorry.... I though my reply was clear when I labeled your fan center.

#6
11-14-18, 05:06 AM
Member
Join Date: Jun 2017
Posts: 5
Originally Posted by PJmax
Sorry.... I though my reply was clear when I labeled your fan center.
no, you were corrected base on my initial question!

my question, should have been: which terminal should i connect for the common blue wire vs saying the constant 24v?

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