Williams gas furnace wiring


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Old 06-02-24, 03:20 PM
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Williams gas furnace wiring

Hello,

I'm looking for correct wiring for Williams gas furnace.

The ZE-228S switch was removed by someone, it has been replaced, but I don't understand the wiring to put it all back together.











I would really appreciate info to put this back together. I don't want to burn something out wiring wrong, these things are expensive. Perhaps this wiring diagram can be edited to show how it's all wired. Any help and info would be appreciated.

Thanks, Jason

Also, what are these wires for, thermostat? I would like to add compatible thermostat.
These wires are coming from the wall same as gas line.



 

Last edited by PJmax; 06-03-24 at 11:52 AM. Reason: resized/labeled/added pics
  #2  
Old 06-03-24, 04:05 AM
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The schematic/wiring diagrams shown are for furnace air blower only. There is another for furnace gas flame control. For the black, red and white wires from the motor, the black connects to the speed switch terminal 3, the red connects to the speed switch terminal 2, the white connects to AC neutral. Speed switch terminal 1 connects a fan switch on the schematic. In your photos my guess is this switch is just above the speed switch and has an adjustable temp limit. It has 2 terminals. One goes to speed switch terminal 1. The other terminal needs to get to AC hot. This AC hot need to be controlled by the house thermostat. If the house thermostat operates at 120 vac, it can be wired to provide controlled AC hot. If the house thermostat operates at 24 vac, there needs to be an interposing 24vac relay contact controlling AC hot. What is the operating voltage of the house thermostat? Are there other relays in the furnace control not shown in photos?
 
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Old 06-03-24, 11:54 AM
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I added a picture highlighting the millivolt gas valve.
That's where the t'stat wiring will connect.
Need a picture of that valve with screw terminals.
 
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Old 06-03-24, 03:44 PM
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A pull chain is not typically used as a speed controller because it has an OFF position.



 
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Old 06-03-24, 03:48 PM
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Ribbed power wire goes to white/neutral wire.
The smooth power wire goes to the thermostat.
There is a jumper from the second thermostat terminal to the L pull chain terminal.
Red blower wire goes to 2 on the fan switch.
Black blower wire goes to 1 on the fan switch.
 
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Old 06-10-24, 06:39 AM
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thanks Pete. I will try to wire it up soon. Any chance I can get a modern thermostat? Is it possible those two wires coming from the wall are for a thermostat? I have multimeter I can test continuity, but I don't know where to test it to
 
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Old 06-10-24, 01:22 PM
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You're asking me if those wires are coming from a thermostat ?
Is there a thermostat on the wall ?
If yes... then those two wires are probably coming from the thermostat.

You can add a millivolt type or typically a battery operated thermostat.
 
 

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