Ask Experts Questions for FREE Help !
Ask
    jrep's Avatar
    jrep Posts: 1, Reputation: 1
    New Member
     
    #1

    Feb 20, 2010, 07:08 PM
    Furnace control wiring
    I have a standar heat-cool system with a three speed fan motor. Whenever the system switch is moved to "heat" the furnace fan motor should run constantly at low speed.
    Adotionally, as the fan switch closes during the heating cycle it should change the fan speed to medium. Finally, the fan must still attain high speed for air conditioning.

    I have achieved this with two aditional relays (there's one already in the system); but the challenge now is to make it work with only one aditional relay.
    letmetellu's Avatar
    letmetellu Posts: 3,151, Reputation: 317
    Ultra Member
     
    #2

    Feb 20, 2010, 08:20 PM

    Normally in the heat mode the motor will run in a slower speed than when on A.C. but when the thermostat is satisfied the blower will run for ninety seconds or so and stop completely. Then when the thermostat calls for AC the motor runs on high.

    How many wires do you have that go from the control box down to the motor.
    bernie1951's Avatar
    bernie1951 Posts: 12, Reputation: 1
    New Member
     
    #3

    Feb 21, 2010, 05:23 AM

    Use a double pole double throw relay to replace the two you added

Not your question? Ask your question View similar questions

 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Wiring schematic for a furnace control [ 1 Answers ]

I am trying to replace my furnace control on my furnace. I took the old one off but don't remember which wires went where. I have a model 50T35-743 by white-rodgers. Can you please help me with some type of color wiring schematic? Thank you!!

Add on coal/wood furnace thermostat wiring for 2 zone house with oil furnace [ 1 Answers ]

I purchased a Harman wood / coal furnace model SF-2500 (forced hot air system) and am tying into my existing forced hot air oil furnace 2 zone system and do not know how to tie into the existing thermostats and zones. I wish to still use the 2 separate zones for the bedrooms and the main body of...

"T" sat wiring for york gas furnace control board. [ 3 Answers ]

I have maple/chase programmable "T" stat... Two stat wires going to control board (Note:.. this board operates heat/ac) wire #1 yellow, red, white, green.. wire #2 red, white. Board terminals Y1, Y/Y2, W, R, G, C... What is the correct wiring for wires #1&2 to terminals.. Thanks in advance for...

Rheem furnace old fan control wiring [ 5 Answers ]

Does anyone know where I could obtain wiring schematic for an old Rheem furnace built in 1976?


View more questions Search