Aprilaire Model 8570 - Manual (Page 6)

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Figure 1 and the table show the number of wires that must be available at the thermostat in stand-alone thermostat systems (i.e. not as
part of an Aprilaire
® Model 6504 Intelligent Zone System). Figure 1 shows optional connections to both an outdoor temperature sensor and
an Aprilaire ® Automatic Humidifier Control (AHC), but only one or the other can be used. All wire is standard 18-24 gauge thermostat cable.
When this thermostat is connected to a Model 6504 as
shown in Figure 2, only one four-wire cable need be run
from the thermostat to the Model 6504. Use standard
18-24 gauge thermostat cable.
OPTIONAL –
AUTOMATIC
HUMIDIFIER
CONTROL
(AHC)
HVAC
EQUIPMENT
MODEL 8570
THERMOSTAT
SEE
TABLE
2-WIRES
2-WIRES
2-WIRES
OPTIONAL –
OUTDOOR
TEMPERATURE
SENSOR
OPTIONAL –
INDOOR
TEMPERATURE
SENSOR
MODEL 8570
THERMOSTAT
MODEL 6504 4-WIRES
Application # Wires Diagram (Page)
Single-Stage Furnace/AC 5 1 (9)
Two-Stage Furnace/AC 7 2 (10)
Two-Stage Roof Top Unit 7 3 (11)
Boiler w/AC (2-transformer) 6 4 (12)
Radiant 1st Stage Heat, 6 5 (13)
Furnace 2nd Stage and AC
Single-Stage Heat Pump 6 6 (14)
Two-Stage Heat Pump 8 7 (15)
WIRE REQUIREMENTS
Figure 1 – Thermostat Wire
Figure 2 – Model 6504 Wire