Aprilaire 8570 Premium Programmable Thermostat Instruction Manual
Figure 9
(8) OPTIONAL – INSTALL AN AUTOMATIC HUMIDIFIER CONTROL (AHC)
Note: The AHC uses its own outdoor temperature sensor,
which is read by the thermostat. If an AHC is to be installed,
do not wire an outdoor temperature sensor to the ODT
terminal of the thermostat.
2. Run a 2-wire cable from the AHC to the thermostat.
3. Wire the AHC to the thermostat (see Figure 9).
• Strip 1/4" of insulation from the ends of the wires.
Automatic
Humidistat
Control
I+ I-
R
C
H
ODT
24V
B2203201 Rev. B
• Connect the I- terminal of the AHC to the I- terminal of
the thermostat.
1. Mount the AHC and its outdoor temperature sensor.
Note: Set 6504 / AHC Switch
on 8570 to AHC position
Outdoor
Temperature
Sensor
• Follow the directions provided with the AHC except do
not mount the AHC temperature sensor in a fresh air
intake. The temperature sensor must be mounted
outside.
• Connect the I+ terminal of the AHC to the I+ terminal of
the thermostat.
I
+
I
-
R
C
H
ODT
24V
B2203201 Rev. B
Model 8570
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.
• Maximum wire length from AHC to thermostat is 300 feet.
• The AHC must have constant power. DO NOT power
the AHC through furnace accessory terminals
(a Model 50 current sensing relay is not used).
To Humidifier
5. After completing the thermostat installation, you will also
need to verify proper operation of the AHC – see AHC
installation instructions for details on how this is done.
• DO NOT operate the AHC in Manual Mode – this will
result in the outdoor temperature shown on the
thermostat to always be 20°F.
Note: AHC must be powered by
a continuous supply - do not wire
to furnace accessory terminals.
Transformer
WARNING
Improper installation may cause serious
injury from electrical shock. Do not power up humidifier
before completing the thermostat installation.
CAUTION
Do not run the wire along side line voltage
90-1029
(120 VAC) or higher lines as this can cause erratic readings.
- 22 -
- 23 -
| General | Details |
|---|---|
| Name | Aprilaire 8570 Premium Programmable Thermostat Instruction Manual |
| Make | Aprilaire |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.57 MB |
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