Diagram 2: Two-Stage Furnace And Ac; Diagram 3: Two-Stage Roof Top Unit - Aprilaire 8570 Safety & Installation Instructions

SUPPLIED JUMPER
TWO-STAGE FURNACE
2ND
STAGE W2
HEAT
1ST
STAGE W1
HEAT
1ST STAGE
Y1
COOL
2ND STAGE
Y2
COOL
FAN
G
RELAY
C
24
VAC
R
120
VAC
1ST
STG Y1
COOL
2ND
STG Y2
COOL
C
TWO-STAGE AIR CONDITIONER

Diagram 2: Two-Stage Furnace and AC

- 10 -
APRILAIRE MODEL
8570 THERMOSTAT
W2
THERMOSTAT
W1
CONFIGURATION
RH
SWITCH SETTINGS
R
SINGLE MULTI
RC 1
HP HC
2
G
ELECT GAS
3
Y1
O B
4
Y2
B
ELECT/GAS - SET TO
O
ELECT FOR ELECTRIC
C
HEAT, SET TO GAS FOR
FOSSIL FUEL HEAT
I+
AHC
CONNECTION
I-
ZB
6504
ZA CONNECTION
OUTDOOR (ODT)
GND
& INDOOR (IDS)
ODT
TEMPERATURE
SENSORS
IDS
EVENT
COM
TRIGGERED
NO
OUTPUT
NC
(ETO)
TWO-STAGE ROOF TOP UNIT
SUPPLIED
(RTU)
JUMPER
2ND
STAGE W2
HEAT
1ST
STAGE W1
HEAT
1ST
STAGE Y1
COOL
2ND
STAGE Y2
COOL
FAN
G
RELAY
C
24
VAC
R
120
VAC

Diagram 3: Two-Stage Roof Top Unit

- 11 -
APRILAIRE MODEL
8570 THERMOSTAT
W2
THERMOSTAT
W1
CONFIGURATION
RH
SWITCH SETTINGS
R
SINGLE MULTI
RC 1
HP HC
2
G
ELECT GAS
3
Y1
O B
4
Y2
B
ELECT/GAS - SET TO
O
ELECT FOR ELECTRIC
C
HEAT, SET TO GAS FOR
FOSSIL FUEL HEAT
I+
AHC
CONNECTION
I-
ZB
6504
ZA CONNECTION
OUTDOOR (ODT)
GND
& INDOOR (IDS)
ODT
TEMPERATURE
SENSORS
IDS
EVENT
COM
TRIGGERED
NO
OUTPUT
NC
(ETO)