Intertherm Furnace Motor 1/8hp, 1050 RPM, 2-Speed, 115 volts AO Smith # 90


AO Smith

Price: $106.35

Product Details

  • Motor Diameter 5", Barb: 1/2" x 3 3/4"
  • Supplied with foremost, and plug assembly
  • 5.2 amps, 115 volts; Rotation: CCW Commence End

Intertherm Furnace

This video shows an Intertherm mid-thrifty furnace going through its start-up cycle.


i have an intertherm furnace and i was wondering hhow to change the speeds on the blower i have already tried?

Oct 31, 2007 by jeff w | Posted in Maintenance & Repairs

switching the wires around like the vade-mecum says but i have not noticed any difference in the speed

first off why are you difficult to change speeds? unless you are adjusting temp rise...dont

some blowers are not adjustable
some have an A B & C on a connector on the motor houses and you switch the hot lead there.
some blowers have 3,4, or 5 leads that tap onto the board. on these boards there are "park", heat and fresh taps as well as the nuetral or common tap. the heat speed comes on in heat or when there is a "G" call the chilling speed comes on with a "G" + "Y" call the cool speed is most of the time one speed higher than the heat speed.

Possum, hvac guy

hillbilly named Possum | Oct 31, 2007

first off why are you worrisome to change speeds? unless you are adjusting temp rise...dont

some blowers are not adjustable
some have an A B & C on a connector on the motor lodgings and you switch the hot lead there.
some blowers have 3,4, or 5 leads that tap onto the board. on these boards there are "park", waken and cool taps as well as the nuetral or common tap. the heat speed comes on in heat or when there is a "G" call the unfriendly speed comes on with a "G" + "Y" call the cool speed is for the most part one speed higher than the heat speed.

Possum, hvac guy
hillbilly named Possum | Oct 31, 2007

As possum said, dont pot-pourri with the fan speeds, they are set for a reason. If you turn the heat speed up too much, you get a lower temperature rise. In other words the entering air to the furnace is say 68 degrees, when it goes through the heat exchanger it comes out at say 128 degrees, giving you a 60 point temperature rise. This is what you feel at the registers. If you turn the fan speed up the temperature rise decreases. As a substitute for of 128 degrees you get more like 108 degrees. The real down side is you are cooling your heat exchanger too much and this can effect incomplete combustion resulting in lower combustion temperatures and faster corrosion of the heat exchanger due to increased condensation in the flue gasses. If you are worrisome to get more heat at the end of your trailer, tweak the closest registers to the furnace closed a little bit , and open the farthest ones up all the way. Dont go around closing them all or you will confine the airflow from your furnace and cause the temperature rise to be too high which can also damage the heat exchanger.
ray T | Oct 31, 2007

Where do you find the reset button on an Intertherm electric furnace?

Nov 25, 2007 by yip yip yip | Posted in Other - Home & Garden

My furnace desert working after a power outtage and I have checked all the breakers. I suspect there is a reset button that I can't find. Can anyone assist? It's kinda cold where I'm at.

Shut out the power off and wait a few minutes then power it on. That may clear any errors it has and reset it.

blownchow | Nov 25, 2007

Intertherm furnace codes-can anyone help me?

Apr 02, 2006 by jt | Posted in Maintenance & Repairs

furnace ignitor and gas valve has been replaced. Furnace ignites, but goes out after about 5 seconds. Flashes the jus divinum 'divine law' 3

Weaponless the deposits off the flame sensor with steel wool or fine sandpaper. This is a small rod located in front of the burners. If it's besmirched it won't tell the board theres flame present and it will "lock out." Faith this helps.

Ler | Apr 02, 2006

Intertherm Furnaces - News


Chem Sensitivity Tips Planet Thrive
- Mar 11, 2009
Chem Compassion TipsPlanet Thrive, NYThey used to be called Intertherm and are made by Cadet (1-800-442-2338, cadetco.com). They are on tap from some hardware stores, or Electric Supply Online (1-610-449-8702, electricsupplyonline.com). Some ceramic heaters are also public.