Fig. 15. Close-up of pressure switch wiring.
1. Run the two-strand thermostat wire from the humidifier to the humidistat, and from the humidistat to the
pressure switch and back to complete the wiring loop to the humidifier. This is illustrated in Fig. 14.
2. Cut lengths of thermostat wire to reach between components, leaving adequate wire at both ends for
connections.
NOTE: Humidistat and pressure switch can be wired in any order.
3. At the humidifier, connect the black and white conductors to the two black humidifier wires.
4. At the transformer, connect both black conductors to the two transformer terminals. Use a wire nut to connect
together the two white conductors.
5. At the humidistat, connect both black conductors to the two humidistat terminals. Use a wire nut to connect
together the two white conductors.
TESTING HUMIDIFIEROPERATION
Checklist
Humidifier is level.
Control wiring was reviewed using circuit diagram.
Humidifier is plugged in.
Feed line has no kinks.
Drain line slopes continuously down and ends at floor drain.
Water hose inside humidifier is connected to Perfect Flow™ water distribution tray.
After installation use the following steps to check the humidifier operation:
1. Turn on the power and the water supply
2. Turn the H8908 Humidistat to On and turn on the heat by setting the thermostat to 10ºF (6ºC) above room
temperature.
IMPORTANT: The furnace blower must be on to activate the humidifier
3. Make sure that water is flowing out of the drain hose. If water does not flow, see Troubleshooting Your
Humidifier section.
4. Check for leaks.
5. Reset the thermostat and H8908 Humidistat to a comfortable setting for automatic operation.
OPERATION
How Your Humidifier Works
Your Honeywell humidifier uses the principle that vapor (evaporated water) is created when warm air blows over a
water-soaked area. As the vapor circulates, the relative humidity rises
Your humidity control monitors the relative humidity and activates the humidifier accordingly. The humidifier has a
water supply that dispenses water evenly over a humidifier pad. The warm dry air, from the furnace, passes over the
humidifier pad and picks up the moist air to circulate it throughout your home.
Humidified air feels warmer and more comfortable so you may be able to lower your thermostat heating set point,
which saves money on your heating fuel bills. The end result is that your humidifier gives you a comfortable
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