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APRILAIRE MODEL
8570 THERMOSTAT
2ND
STG
COOL
1ST
STG
COOL
TWO-STAGE AIR CONDITIONER
Y2
C
Y1
FAN
RELAY
1ST
STAGE
HEAT
R
TWO-STAGE FURNACE
C
G
Y2
Y1
W1
W2
2ND STAGE
COOL
1ST STAGE
COOL
L1
L2
120
VAC
24
VAC
2ND
STAGE
HEAT
SUPPLIED JUMPER
ZA
ZB
I+
I-
6504
CONNECTION
B
O
Y2
Y1
G
RC
R
RH
W1
W2
C
AHC
CONNECTION
ELECT/GAS - SET TO
ELECT FOR ELECTRIC
HEAT, SET TO GAS FOR
FOSSIL FUEL HEAT
THERMOSTAT
CONFIGURATION
SWITCH SETTINGS
OUTDOOR (ODT)
& INDOOR (IDS)
TEMPERATURE
SENSORS
HC
SINGLE
B
GAS
HP
MULTI
O
ELECT
4
3
2
1
ON
NC
NO
COM
EVENT
TRIGGERED
OUTPUT
(ETO)
IDS
ODT
GND
APRILAIRE MODEL
8570 THERMOSTAT
FAN
RELAY
1ST
STAGE
HEAT
R
TWO-STAGE ROOF TOP UNIT
(RTU)
C
G
Y2
Y1
W1
W2
L1
L2
120
VAC
24
VAC
2ND
STAGE
HEAT
1ST
STAGE
COOL
2ND
STAGE
COOL
SUPPLIED
JUMPER
ZA
ZB
I+
I-
6504
CONNECTION
B
O
Y2
Y1
G
RC
R
RH
W1
W2
C
AHC
CONNECTION
ELECT/GAS - SET TO
ELECT FOR ELECTRIC
HEAT, SET TO GAS FOR
FOSSIL FUEL HEAT
THERMOSTAT
CONFIGURATION
SWITCH SETTINGS
OUTDOOR (ODT)
& INDOOR (IDS)
TEMPERATURE
SENSORS
HC
SINGLE
B
GAS
HP
MULTI
O
ELECT
4
3
2
1
ON
NC
NO
COM
EVENT
TRIGGERED
OUTPUT
(ETO)
IDS
ODT
GND
- 10 - - 11 -
Diagram 2: Two-Stage Furnace and AC Diagram 3: Two-Stage Roof Top Unit