Lennox G43UF Installation Instructions

Page 31
Thermostat
G43UF
Furnace
Condensing
Unit
G43UF and CONDENSING UNIT
THERMOSTAT DESIGNATIONS
(Refer to specific thermostat and outdoor unit.)
COMMON
POWER
HEAT
INDOOR BLOWER
Y
C
R
G
W1
Y
C
R
G
W
COOLING
FIGURE 41
CONDENSING
UNIT
CONDENSING
UNIT COMMON
Install the room thermostat according to the instruc-
tions provided with the thermostat. See figure 41 for
thermostat designations. If the furnace is being
matched with a heat pump, refer to the FM21 installa-
tion instruction.
Indoor Blower Speeds
1 − When the thermostat is set to FAN ON," the indoor
blower will run continuously on the heating speed
when there is no cooling or heating demand.
2 − When the G43UF is running in the heating mode, the
indoor blower will run on the heating speed.
3 − When there is a cooling demand, the indoor blower will
run on the cooling speed.
TYPICAL G43UF FIELD WIRING DIAGRAM
FIGURE 42

Lennox G43UF Specifications

General

Heating Stages	Single-stage
Blower Motor	PSC
Ignition System	Hot Surface Ignition
Gas Valve	Single-stage
Cabinet Width	17.5 inches
Fuel Type	Natural Gas or Propane
Cabinet Type	Upflow/Horizontal
Ignition Type	Hot Surface Ignition
Heating Capacity	44, 000-132, 000 BTUH
Warranty	5-Year Limited Warranty on covered components