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7
FAN
RELAY
2ND
STAGE
HEAT
1ST
STAGE
HEAT
R
HEAT/BLOWER EQUIPMENT
C
G
Y1
W1
Y2
W2
1ST STAGE
COOL
2ND STAGE
COOL
L1
L2
120
VAC
24
VAC
1ST
STG
COOL
2ND
STG
COOL
COOLING EQUIPMENT
Y1
C
Y2
APRILAIRE MODEL 8348
OR 8366 THERMOSTAT
LO
HI
W
RC
RH
W2
Y
Y2
G
HI opens at 100°F±9°F
LO closes at 41°F±9°F
GAS
ELEC
AUTO
ON
Diagram 2 – Model 8348 or 8366 Thermostat Wiring