Hook up humidifier to furnace

How do you wire a humidistat to a furnace?

Some humidistats mount to the cold air return near the furnace, while others mount in the living space near the thermostat. Either way, you need to wire the humidistat into the humidifier box. You also need to tap into an existing hot wire to power the humidifier and its transformer. Working with electricity can be dangerous.

Can a humidifier be connected to a furnace?

Humidifiers that connect to a homes furnace come in three basic designs, all of which raise relative humidity in the home. The least expensive system is one that uses a drum to deliver water from a reservoir to the furnace’s hot air supply for the house.

How to install a humidifier?

Install supply duct: This line will bring water to the humidifier. Install drain piping: This will allow water to leave the humidifier. Connect transformer and wiring: This will power the humidifier. Do not attempt this step on your own!

How to hook up a 24vac humidifier to a 9gmxt furnace?

Since you mentioned you have a 9GMXT furnace, it has a 24VAC dedicated humidifier terminal. The manual states: The 24 VAC HUM terminal is energized when the low pressure closes during a call for heat. [..] Connect a 24 VAC humidifier to the 24 VAC HUM terminal and C screw terminal strip on the control board thermostat strip.

How to install a humidistat in a furnace?

Following the instruction in the manufacturer’s manual, connect the humidistat to the furnace control. Some unit makes use of a step-down transformer 120v to 24v, shut down the power if you haven’t done the wiring. Then you can wire the humidistat and install the transformer.

How do you wire a humidifier to a thermostat?

If you wire it this way: Set the humidistat to ON when the home is occupied; Set the humidistat to 55-60% when away; Set the thermostat to 75-80° when away; This way, the system will only run when the humidity is above the humidity setpoint and the temperature is above the temperature setpoint.

How to wire a Honeywell humidistat?

How to Wire a Honeywell Humidistat 1 Turn off the humidifiers power source. If the humidifier plugs into a receptacle, then unplug the humidifier. 2 Strip 1/2 inch of the insulation from both wire strands in both low-voltage wire sets with wire strippers. 3 Grab one humidistat lead and one black-colored low-voltage wire strand. ... More items...

Can I connect my humidifier to my furnace?

I dont recommend using the G and Gf connections. The humidifier should only run when in heating mode to be most effective. The C connection is available at the furnace in the same place the other thermostat wires are connected.

How does a 24vac humidifier work on a 9gmxt?

Since you mentioned you have a 9GMXT furnace, it has a 24VAC dedicated humidifier terminal. The manual states: The 24 VAC HUM terminal is energized when the low pressure closes during a call for heat.

How do I hook up a humidifier to my furnace?

You may be able to simply connect the wire from the humidifier to the W terminal in the furnace, instead of directly to the transformer. That way, the humidifier will only get power when the thermostat is calling for heat. However, without knowing more details about your system, its impossible to say for sure if that will work.

What voltage should a humidifier run on a furnace?

When the furnace is running in heat mode, you should measure ~120 volts about 1 second after the blower motor starts. According to the manufacturer, the HUM terminal is rated for 1 ampere at 120 volts. You may be able to simply connect the wire from the humidifier to the W terminal in the furnace, instead of directly to the transformer.

How do you energize a 24V humidifier?

The 24 VAC HUM terminal is energized when the low pressure closes during a call for heat. [..] Connect a 24 VAC humidifier to the 24 VAC HUM terminal and C screw terminal strip on the control board thermostat strip.