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Installing the Humidifier Control for
Manual Operation
If it is not feasible to install the Outdoor Temperature
Sensor, the Humidifier Control can be operated in
Manual Mode.
1. Position the Mode Switch in the “MAN” position.
Manual indicator “M” will be displayed.
2. Apply the Manual Mode Label to the cover,
aligning the sticker and knob holes.
Figure J
90-1236B
STEP 8: Route the Wire from Control to Sensor
Run wire to the outdoor temperature sensor. Sensor is not
affected by lead lengths less than 300 feet.
Secure the sensor bracket with a #8 screw.
STEP 9: Attach Sensor Wire to Humidifier Control
Strip wire 1/4 inch, and insert the wires from the Sensor into the
terminals labeled “ODT” on the Humidifier Control. See Figure H
for location of terminals.
BLOWER ACTIVATION
Set the Blower Activation Switch to “ON” to allow the Humidifier
Control to activate the furnace fan for additional humidification.
This may be required if the humidifier is mounted on a heat pump
or a furnace with short run cycles.
When the Blower Activation switch is “ON”, the Humidifier
Control will turn on the HVAC blower when humidity is required.
In the “OFF” position, the humidifier will only operate if humidity
is required and the HVAC system is operating.
Figure H
90-1219B
CAUTION
Do not run outdoor temperature sensor alongside
wires carrying high voltage (120 VAC or higher).
When the Blower Activation switch is “ON”, the Humidifier
Control may periodically turn the HVAC blower on to sample the
humidity of the air.