Question about Honeywell Humidifiers
Trying to operate Aprilaire 700 humidifier using U1 settings in a Honeywell TH8000 Thermostat. Using system 24v transformer, can get T'stat to turn on fan, but no 24v at two low voltage wires to humidifier. T'stat info says to bond R to U1 assumed nearest U1 terminal and I put other humidifier lead to opp. U1 terminal? Answered: Jumper R & U1 (power to relay), One humidifier lead to other U1, Run Com from Furnace to other lead on humidifier. Enables T'stat to close circuit! Note! Only had 4 wires to house T'stat, no common.
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Posted on Jan 02, 2017
If you don't have a volt meter, purchase one. I've seen them as low as $20.00 at Sears and even lower at Home Depot and other discount stores. The HUM terminals are most likely low voltage (24v). The "N" is the neutral. Assuming you have confirmed this is low voltage (24v, you will use HUM and "N" terminals. This control sequence is typically to allow for operation of your humidifier only when there is a call for your fan to run. The brown wires coming from your Humidifier are your low voltage circuit. One should be directly wired to "N". The other should be ran to your humidistat. The other side of the switch of your humidistat should be wired to the HUM terminal.
I hope you will find this helpful. Good Luck!!!!
Posted on Feb 07, 2010
SOURCE: I hooked up a honeywell
If you have very old furnace, does it have a blower with a belt. If it does it should only have 2 wires going to blower. If it has 2 you should be able to use the transformer you have plugged into wall and splice into 2 wires going to blower. If you have more than 2 wires to blower, you will need to find out which one is used for heat plus use the white one. If you have a voltage sensor you should be able to find it easily.
Posted on Jan 24, 2011
in theory should work ..the idea is to run the humidifier in parallel according to the power source ..and serial with the low voltage thermostat ..so ..the plus on the humidifier to go trough the thermostat in order to have power on he right conditions ..but in the same time tide to the source in parallel to do not interfere with other wiring ..and also to run independently of the heater..The heater remaining just an option when needed..Its not rocket science ...
Posted on Jan 24, 2011
Follow manufacturer instalation instructions. Why risk your equipment and you family's health to save a few bucks and a lil trouble on the proper parts. Your family is worth it, now go do the right thing. :)
Posted on Feb 01, 2011
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