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Automatic Digital Humidifier Control
Outdoor
Temperature
Sensor
Note: ADHC must be powered by
a continuous supply - do not wire
to furnace accessory terminals.
Transformer
Model 8570 Thermostat
R C A B ODT CfW/G H
Figure 9
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Note: The ADHC uses its own outdoor temperature sensor,
which is read by the thermostat. If an ADHC is to be installed,
do not wire an outdoor temperature sensor to the ODT
terminal of the thermostat.
1. Mount the ADHC and its outdoor temperature sensor.
• Follow the directions provided with the ADHC except do
not mount the ADHC temperature sensor in a fresh air
intake. The temperature sensor must be mounted
outside to provide a precise temperature reading.
• Maximum wire length from ADHC to thermostat is 300 feet.
• The ADHC must have constant power. DO NOT power
the ADHC through furnace accessory terminals.
DO NOT use a Model 50 Current Sensing Relay.
• NOTE: Operating the ADHC in Manual Mode will result in
the outdoor temperature shown on the thermostat to
always be 20°F.
2. Run a 2-wire cable from the ADHC to the thermostat.
3. Wire the ADHC to the thermostat (see Figure 9).
• Strip 1/4" of insulation from the ends of the wires.
• Connect the A terminal of the ADHC to the ZA terminal
of the thermostat.
• Connect the B terminal of the ADHC to the ZB terminal
of the thermostat.
4. You will need to power up the thermostat to verify the
connection. Refer to step 7 of THERMOSTAT START UP
on page 28.
5. After completing the thermostat installation, you will also
need to verify proper operation of the ADHC – see ADHC
installation instructions for details on how this is done.
Do not run the wire along side line voltage
(120 VAC) or higher lines as this can cause erratic readings.
(8) OPTIONAL – INSTALL AN AUTOMATIC DIGITAL HUMIDIFIER CONTROL (ADHC)
CAUTION
Improper installation may cause serious
injury from electrical shock. Do not power up humidifier
before completing the thermostat installation.
WARNING
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90-1029A