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APRILAIRE MODEL
8570 THERMOSTAT
FAN
RELAY
1ST STAGE
AUX. HEAT
R
INDOOR UNIT - AIR HANDLER
C
G
Y1
W1
W2
L1
L2
120
VAC
24
VAC
2ND STAGE
AUX. HEAT
L
O
Y1
W1
C
R
1ST STAGE
COMP.
REV.
VALVE
DEFROST
SERVICE
OUTDOOR UNIT - HEAT PUMP
SUPPLIED JUMPER
COMPRESSOR
ZA
ZB
I+
I-
6504
CONNECTION
B
O
Y2
Y1
G
RC
R
RH
W1
W2
C
AHC
CONNECTION
SINGLE/MULTI – SET TO SINGLE
FOR SINGLE STAGE HEAT PUMP
ELECT/GAS - SET TO ELECT FOR
ELECTRIC AUXILIARY HEAT, SET
TO GAS FOR FOSSIL FUEL (DUAL
FUEL) AUXILIARY HEAT
O/B – SET TO “O” IF HEAT PUMP
REVERSING VALVE MUST BE
ENERGIZED WHEN COOLING,
SET TO “B” IF IT IS TO BE
ENERGIZED IN HEATING
AUXILIARY HEAT SET UP
1. WITH THERMOSTAT IN OFF
MODE, PRESS AND HOLD THE
UP AND DOWN BUTTONS FOR
3 SECONDS TO ENTER THE
ADVANCED SETTINGS MENU.
2. SCROLL DOWN AND
HIGHLIGHT THE “AUXILIARY
HEAT SETUP” OPTION AND
PRESS SELECT.
3. HIGHLIGHT “TWO STAGE AUX
HEAT” AND PRESS SELECT
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
AUX. HEAT
R
INDOOR UNIT - AIR HANDLER
C
G
Y1
W1
L1
L2
120
VAC
24
VAC
L
O
Y1
W1
C
R
1ST STAGE
COMP.
REV.
VALVE
DEFROST
SERVICE
OUTDOOR UNIT - HEAT PUMP
COMPRESSOR
SUPPLIED
JUMPER
ZA
ZB
I+
I-
6504
CONNECTION
B
O
Y2
Y1
G
RC
R
RH
W1
W2
C
AHC
CONNECTION
SINGLE/MULTI – SET TO SINGLE
FOR SINGLE STAGE HEAT PUMP
ELECT/GAS - SET TO ELECT FOR
ELECTRIC AUXILIARY HEAT, SET
TO GAS FOR FOSSIL FUEL (DUAL
FUEL) AUXILIARY HEAT
O/B – SET TO “O” IF HEAT PUMP
REVERSING VALVE MUST BE
ENERGIZED WHEN COOLING,
SET TO “B” IF IT IS TO BE
ENERGIZED IN HEATING
AUXILIARY HEAT SET UP
1. WITH THERMOSTAT IN OFF
MODE, PRESS AND HOLD THE
UP AND DOWN BUTTONS FOR
3 SECONDS TO ENTER THE
ADVANCED SETTINGS MENU.
2. SCROLL DOWN AND
HIGHLIGHT THE “AUXILIARY
HEAT SETUP” OPTION AND
PRESS SELECT.
3. HIGHLIGHT “ONE STAGE AUX
HEAT” AND PRESS SELECT
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
- 14 - - 15 -
Diagram 6: Single-Stage
Heat Pump with Single-Stage
Back Up Heat
Diagram 7: Single-Stage
Heat Pump with Two-Stage
Back Up Heat