Aprilaire 8346 Installation Manual page 8

Diagram 2 – Model 8348 or 8366 Thermostat Wiring
HEAT/BLOWER EQUIPMENT
2ND
STAGE
HEAT
2ND STAGE
1ST
STAGE
HEAT
1ST STAGE
FAN
RELAY
24
VAC
120
VAC
COOLING EQUIPMENT
2ND
STG
COOL
1ST
STG
COOL
7
W2
COOL
Y2
W1
Y1
COOL
G
C
R
Y2
Y1
C
APRILAIRE MODEL 8348
OR 8366 THERMOSTAT
W2
W
GAS
ELEC
Y2
Y
AUTO
G
ON
RC
RH
HI opens at 100°F±9°F
LO closes at 41°F±9°F
LO
HI