My furnace blower is rather loud and runs at one speed. I wish to have the blower run at a slower speed to mix the air in the house when the heat is not called for. I see some furnaces have variable speed blowers, which may also solve this issue if I run at high speed when the flame is ON and low speed when OFF.
Can I retrofit my Payne PG8UAA furnace with a two-speed or variable speed blower?
There are no other issues with the furnace, so I do not wish to replace the whole unit.
Thank you
According to the manufacturer's documentation, your furnace should have a 3 or 4 speed blower motor. The problem is, the furnace control module doesn't use a separate speed when the unit is running in continuous FAN mode.
When the R-G circuit is made, the blower motor operates on heating speed.
The control module only uses two speeds, one for COOL, and one for HEAT/FAN.
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You could run the blower at a slower speed during both HEAT and FAN calls. But you'd have to insure that the blower is maintaining adequate flow during heating, otherwise you will damage the system. This is not recommended, as you could damage the system, and void the warranty.
You might be able to swap out the control module, but you'd have to contact the manufacturer to determine if there's a compatible replacement.
The other option is to build your own control circuitry, but that's beyond the scope of this site. And will likely void the warranty on the unit.
yes. however, it requires a lot of electronics and process control components. if you don't understand this stuff, then no.
1) swap motor out for a dc synchronous drive motor or you may be able to get a sine controller for a motor that small (1st way is better - they last forever). this may require machining interface parts, mounts, etc.
2) you need to decide on a control protocol for the speed switching - pressure or temp triggered. whichever, then you need a proportional sensor for same.
3) use a plc, arduino or beaglebone to take all the i/o's and pop the sc driver.
done
