Honeywell s8610u 24V Connection - No Voltage


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Old 02-20-10, 05:55 PM
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Honeywell s8610u 24V Connection - No Voltage

I installed a new Aprilaire 600A whole house humidifier to my Trane furnace which has the Honeywell S8610U ignition module. We connected the Aprilaire humidistat to the 24V (connector #6) but that did not trigger the solenoid to open up on a call for humidity. When connected to TH-W (connector #7) the humidifier / solenoid operates correctly. Does the S8610U not have a connection to indicate when the blower motor is activated or do I need to leave the connection to TH-W which activates the humidifier when the ignition turns on?
 
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Old 02-23-10, 07:34 AM
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I dont know what connector 6 is and i assume TH-W is thermostat W, heat. then humidifier would be hooked up to W so that it comes on only when W is activated which is when there is a call for heat.
 
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Old 02-23-10, 08:27 AM
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Thanks. Connector 6 is labeled "24V". However, we tested that connection and there is no voltage. In further research I found a PDF on the Honeywell S8610U module and it says not to use the 24V terminal on the S8610U. So I believe we have it set up correctly - we were just trying to find a connection that triggers the humidifier by the start of the blower motor but it should be fine being triggered by a call for heat.

Thanks for the response!
 
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Old 02-23-10, 04:56 PM
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Humidifier

Most furnaces have terminals on the control board (not the ignition module) labeled for humidifier connection. If your furnace does not have such terminals I prefer to use an inductive pick up attached around the heating speed fan wire.
 
 

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