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Ask Rick Mather Your Own Question
Rick Mather
Rick Mather, HVAC Technician
Category: HVAC
Satisfied Customers: 3634
Experience:  35 years experience, HVAC
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I just installed a Honeywell RTH2410 today. There was blue

Customer Question

I just installed a Honeywell RTH2410 today. There was blue wire connected to my old thermostat yet my furnace does not have a pump, when a connected this wire I got cool air coming from the vents.
Submitted: 6 years ago.
Category: HVAC
Expert:  Rick Mather replied 6 years ago.

Rick Mather :

Do have oil heat if so it maybe the power for cooling and it gets connected to Rc then remove jumper from Rc to R or Rh

Customer:

No I do not have oil heat is a gas furnace. In the regular connection there were four wires the fifth one is the blue wire.

Expert:  Rick Mather replied 6 years ago.

What coloring wires do you have this below is typical blue could be transformer common will wait to see what you have

 

R terminal is jumpered to Rc red wire

G terminal is blower green wire

W is heating white wire

y is cooling yellow wire

Customer: replied 6 years ago.
I just put the old one back.
Expert:  Rick Mather replied 6 years ago.
What terminal was the blue wire hooked too
Customer: replied 6 years ago.
It was connected to the O/B switch. But it seems I cannot put this particular model to use. I need to buy another one.
Expert:  Rick Mather replied 6 years ago.
That would be reversing valve control some require power to open for cool and some for heat
Customer: replied 6 years ago.
I no longer need your advice. Thank you for your help I already re-install the old unit.
Expert:  Rick Mather replied 6 years ago.
Ok then request question closed
Customer: replied 6 years ago.
Relist: Closed question. No longer need assistance.
Closed question. No longer need assistance
Expert:  Rick Mather replied 6 years ago.
Sent request to close question