OK. give me a few minutes.
1. disconnected G wire on blower.
2. turned unit back on.
3. furnace came on, heated air, & blower continued to operate.
4. after furnace stopped heating air blower stayed on.
Q: Can tthere be a setting on blower unit wherein the blower stays on all the time
no matter setting on thermostat?
no I do not see the dial on the control panel. I am looking at the control panel hidden by the blower panel at the bottom of the furnace cabinet. It matches Fig 24 in Bryant's installation manual for this furnace. But I do see dip switch assignments for the CF fan operation all in the default position. According to Bryant's notes in their schematic this may allow for continuous fan operation no matter the signal from the thermostat?
No we must be looking at different things. The control panel I am looking at has no dials at all. I have looked al around the blower unit and traced the elec lines - both line voltage & 24V. no dials I can see.
Here is what I will do - I'll call in a local company to see if they can trace down the issue. It does appear as if the thermostat has been bypassed in some way inside the furnace unit.
yes blower motor just turned off after component test.
after rehooking red, resetting SW-6 and powering up furnace I turned up thermostat.
furnace cycled thru burners on, blower cycled up to high sped then reset at lower speed. I turned down thermostat, burners shut off. blower remains running at lower speed.
I am not sure. I encountered this in a home I recently acquired. My information comes from the former owners. One of the family members has breathing issues and needed a constant supply of air circulating in the home to help her breathe. My guess is that the furnace/ a/c unit was installed to constantly circulate air.
The former owners just built a brand new home with medical quality air handling & filtration in addition to being chemical-free. I am trying to get the furnace back to what I would anticipate would be 'normal' mode.
yes and without improvement. I bet at this point I'll get a local firm to sort thru the controls. I am betting they will find a very specific wiring set-up done to accomodate the requests of this family when the unit was first installed.
Thank you for your time and help.