Lennox ML193UH045P36B Unit Information page 13

TWO-STAGE THERMOSTAT
R
Call For Cool
Y
Call For Fan
G
Call For 1st
Stage Heat
W1
Call For 2nd
StageHeat
W2
ISOLATION
RELAY
FIELD WIRING FOR TWINNING THE ML193UH
TWIN
R
TWIN 1
Y
G
W
C
TWIN
R
TWIN 2
Y
G
W
C
FIGURE 9
Page 13
SINGLE STAGE THERMOSTAT
R
Call For Cool
Y
Call For Fan
G
Call For Heat
W
ISOLATION
RELAY
TWIN
R
TWIN 1
Y
G
W
C
TWIN
R
TWIN 2
Y
G
W
C