Modify existing furnace to allow constant blower run
#1
09-09-14, 12:21 PM
Modify existing furnace to allow constant blower run
I have a standard domestic gas furnace. The remote thermostat has only a 2 wire run back to the furnace. I wish to run the furnace blower for long periods to circulate cooler air through the house during the summer. I can push the manual over ride button in on the high limit switch, which achieves this. Is it possible for me to add a second switch in parallel with the over ride button outside the furnace so that I don't need to open up the furnace to operate it? Is this a safe practice?
#2
09-09-14, 06:08 PM
Group Moderator
Running the blower full time usually results in mediocre results and a higher electric bill.
That button on the fan thermostat is mechanical so there is no way of extending it.
You could add a small fan center. That's a small transformer, junction box and relay. This would be worthwhile if you had an extra wire to the thermostat and a FAN ON postion on the thermostat.
You could also add a second switch.... like a light switch.... and connect the terminals to the blower wires in the fan thermostat. You would be connecting the two switches in parallel.
That button on the fan thermostat is mechanical so there is no way of extending it.
You could add a small fan center. That's a small transformer, junction box and relay. This would be worthwhile if you had an extra wire to the thermostat and a FAN ON postion on the thermostat.
You could also add a second switch.... like a light switch.... and connect the terminals to the blower wires in the fan thermostat. You would be connecting the two switches in parallel.
