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7. Locate the other plenum and cut an opening for a 6 in. (152 mm)
collar.
8. Install the 6 in. (152 mm) collar.
NOTE: Be sure to install a duct damper for summer shutoff on
systems with air conditioning.
COVER
WATER
FEED NOZZLE
HUMIDIFIER
PAD ASSEMBLY
HUMIDIFIER
HOUSING
WATER
FEED TUBE
SIDEWALL
BYPASS SIDEWALL
Fig. 2. Humidifier components.
9. Install a 6 in. (152 mm) diameter duct from the collar to the
humidifier.
NOTE: Some installations require a 90° elbow attachment to the
collar.
10. Seal the duct connections with duct tape.
NOTE: To avoid sagging and stress on the humidifier, add
support when ducting is longer than 4 ft (120 cm).
11. Reinstall the humidifier pad assembly in the humidifier housing.
NOTE: Be sure the water feed tube is not pinched or kinked.
12. Hinge the cover in place and secure with the thumbscrew located
at the bottom of the cover.
69-1105EF—3
FRAME
M12304
WIRING
CAUTION
Hazardous Voltage.
Can cause personal injury or equipment damage.
• Disconnect power supply before installing or servicing.
• On multispeed blower applications, do not wire the high
voltage side of the transformer to the same power source that
services the furnace blower or the transformer may burn out
prematurely.
All wiring must comply with applicable local codes, ordinances and
regulations.
1. Mount the transformer in a convenient location.
IMPORTANT
Install transformer on the outside of a grounded metal junction
box using only a 7/8 in. (22 mm) knockout hole. Place mounting
tabs into the knockout hole and firmly tighten the locking screw.
Field wiring connections and grounding means for the
transformer and enclosure shall be in accordance with the
National Electrical Code (NEC) and the Canadian Electrical
Code (CEC).
2. Connect wires to the 120V side of the transformer.
For humidity control wiring connections:
1. Wire the humidifier solenoid valve, current sensing relay or sail
switch, humidity control and transformer. Refer to the humidity
control installation instructions for mounting and wiring
information.
IMPORTANT
• For proper operation, the humidifier must be energized during
blower motor cycles.
• Current sensing relay or sail switch is not needed with the
Automatic Humidity Control.
NOTE: Select models of fan centers include humidifier taps so the
current sensing relay or sail switch are not needed.
PLUMBING SADDLE VALVE
Hot or cold water, either hard or softened, can be used in the humidifier.
1. Use the self-piercing saddle valve (included) to tap into the water
supply line at an appropriate location.
WARNING
Chemical Hazard.
Can cause personal injury or equipment damage.
Do not use any line connected to an air conditioner.
2
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