Where is the C Common stationary on my white rodgers model 50a51 495


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Old 01-26-14, 12:20 PM
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Where is the C Common stationary on my white rodgers model 50a51 495

I bought a HoneywellRTH6500W Thermostat.
It requires a C wire that I don't have.
I have a free wire that goes to the Furnace.

Can you help me to find a C stationary on my Furnace:
Trane XL 80 with a White Rodgers model 50a51 495
Does it has a COMMON stationary 24VAC?
Can I use the Comm stationary? Picture attached. (but I measure ~50VAC instead of 24 VA)

Thanks for your help
Serge
 
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Old 01-26-14, 04:06 PM
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I can't read the entire low voltage terminal strip but I believe the terminal above "G" might be "C" (common). There is a single white wire attached to it which likely goes to the outdoor unit of the air conditioner.
 
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Old 01-26-14, 10:39 PM
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Thanks. The Top terminal is marked B. And yes it seems to go to the AC.
Can I used that as Common. (I measured no voltage on it)?

I'll try to post a better pics if I can find how.
 
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Old 01-27-14, 08:40 PM
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The A/C requires a common. That 'B' terminal almost has to be a common for the 24 volt system.
Between 'B' & what other terminal were you trying to measure voltage?
FYI: "Common" is the neutral or ground side of the 24 volt side of the system.
 
 

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