blower activation - http://www.hvacmechanic.com/ Forums
Original message
| macdon221
 |  "blower activation"
, posted Tue 15 Apr 22:06  
I have a Lennox G26 furnace. I have a pressure swich that is activated by an exhaut fan to start the blower in my furnace. What contacts do I hook the wires from the pressure switch to in order to activate the furnace blower. Do I use the R and G or do I use the R and C? My A/C unit is wired to the C and Y. Is this correct as well?
macdon221
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Replies:
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| smythers1968
| "Re(1):blower activation" , posted Fri 18 Apr 21:22
Jumping green and common won't make the blower come on.
When in a/c your t-stat make a connection between R and Y and G.
R=24vac
G=call for blower
Y=call for a/c
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| answer
| "Re(1):blower activation" , posted Tue 15 Apr 22:52
The exaust fan has nothing to do with the AC, the board in the unit should turn the fan on in ac mode from the t-stat. the pressure switch doesn't actualy make the circuit for the blower.
I may not be getting your question but a relay powered with Green and common will activate for a fan call from thermostat. I don't know the G26 spacificly.
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