Aprilaire 8570 Wire Requirements, Two-Stage Furnace/AC, Radiant 1st Stage Heat

WIRE REQUIREMENTS

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.

Figure 1 – Thermostat Wire
	OPTIONAL –
AUTOMATIC			HVAC
HUMIDIFIER
			EQUIPMENT
	CONTROL
	(AHC)
OPTIONAL –	2-WIRES		SEE	OPTIONAL –
			TABLE	INDOOR
OUTDOOR
				TEMPERATURE
TEMPERATURE
				SENSOR
SENSOR
2-WIRES				2-WIRES
		MODEL 8570
		THERMOSTAT

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.

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)
Figure 2 – Model 6504 Wire
	MODEL 8570
		4-WIRES	MODEL 6504
	THERMOSTAT

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