Aprilaire 500 on Rudd UGRA-07EMAES

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Old 01-04-17, 06:30 PM
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Aprilaire 500 on Rudd UGRA-07EMAES

How do I wire 24 Vac transformer? I am wanting the humidifier to be able to run with fan if it needs more humidity after the heat shuts off. On the instructions this is what it says wire external 24 vac transformer into constant power source other than the heating ventilating air-conditioning equipment HVAC blower circus. the transfer I can be powered off 120 VAC line at the junction box before it enters the HVAC equipment. connect the 24 V side of the transformer to one of the H terminals on the humidifier control and to one of the humidifier or solenoid valve wires. Connect the other solenoid valve wire to the other H terminal.
 
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Old 01-04-17, 07:47 PM
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Sorry Ruud. After I have been looking a little more I would hook the 24 vac transformer to EAC and N? I also have a Hum terminal but if I hook humidifier up to that it will only work when the heat running?
 
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Old 01-05-17, 04:50 PM
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Welcome to the forums.

Sorry to leave you hanging.

Yes.... EAC (electronic air cleaner) is active any time blower is running.
HUM is only active during burner operation.

On my humidifier installs I don't allow my blower to turn the humidifier on. I've found that there is not enough moisture carried with the cool air to make it cost effective.

That's my opinion.

If you are using the electronic humidistat.... you don't even need an EAC or HUM connection.


Using this diagram... (says 600 but 500 is the same wiring).....
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This powers everything from the furnace. In addition to the W wire from the humidistat also connect a wire from G to the G terminal at the furnace. Now.... when the blower is set to FAN ON.... the humidifier can run.
 

Last edited by PJmax; 01-05-17 at 05:10 PM.
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Old 01-05-17, 05:05 PM
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How would I hook it up than if I do not have it run with the blower?
 
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Old 01-05-17, 05:11 PM
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What about 24 vac transformer?
 
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Old 01-05-17, 05:12 PM
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Just ignore the G (green) wire.

Input connections to the humidistat are what turn the humidifier on.
The W connection activates the humidifier during a call from heat from the stat.
The G connection activates the humidifier during FAN ON operation.

Keep it for a spare.
 
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Old 01-05-17, 05:21 PM
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So I take it my furnace is 24 and just don't need the transformer
 
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Old 01-05-17, 06:08 PM
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Yes... your furnace is controlled by 24vac.
 
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Old 01-08-17, 09:36 AM
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Just wanted to say thank you Pjmax for the help. I have it all hooked up and it's working.
 
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Old 01-08-17, 10:18 AM
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Great news... thanks for the update.
 
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