Lennox G51MP SERIES Installation Instructions Manual page 35

G51MP and CONDENSING UNIT
THERMOSTAT DESIGNATIONS
(Refer to specific thermostat and outdoor unit.)
Thermostat G51MP
Furnace
POWER
R
R
HEAT
W1 W
COOLING
Y Y
INDOOR BLOWER
G G
COMMON
C
C
FIGURE 51
One 24 volt 24V HUM" terminal is provided on the
furnace control board. Any humidifier rated up to 0.5
amp can be connected to this terminal with the com-
Condensing
Unit
CONDENSING
UNIT
CONDENSING
UNIT COMMON
TYPICAL G51MP FIELD WIRING DIAGRAM
FIGURE 52
Page 35
mon leg of the circuit being connected to the C" ter-
minal of the thermostat terminal block, which is lo-
cated on the control board.
Install the room thermostat according to the instruc-
tions provided with the thermostat. See figure 51 for
thermostat designations. If the furnace is being
matched with a heat pump, refer to the FM21 installa-
tion instruction.
Indoor Blower Speeds
When the thermostat is set to FAN ON," the indoor
blower will run continuously on the continuous low
speed (FAN) when there is no cooling or heating de-
mand.
When the G51MP is running in the heating mode, the
indoor blower will run on the heating speed.
When there is a cooling demand, the indoor blower will
run on the cooling speed.