Lennox Hearth L20 BF-2 - Manual (Page 22)

WIRING DIAGRAMS
PAGE 22
GAS CONTROL AND SAFETY SYSTEM WIRING DIAGRAM
CAUTION: Label all wiring prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous opera-
tion. Verify proper operation after servicing.
The gas control wiring diagram shown here should be used by service technicians for guidance when troubleshooting problems with
the pilot safety (millivolt) system or burner remote control system or when locating system components for repair / replacement.
Note: If replacement of any of the original wire is necessary, use 105°C thermoplastic wiring.
MODEL L20 BF-2 MODEL L20 DVF-2
CIRCULATING BLOWER WIRING DIAGRAM (ALL MODELS
Thermocouple
Thermocouple
Igniter Igniter Gas
Pilot
Gas
Pilot
Thermopile
Thermopile
Pilot
Assembly
Pilot
Assembly
Vent Spill
Switch
Wall Thermostat
(optional)
Wall Thermostat
(optional)
Burner ON/OFF
Switch Burner ON/OFF
Switch
Variable Speed
Control
(rheostat)
Thermostatic
Switch (fan disc)
Microswitch for
Control Panel Light
Control
Panel
Light
Ground
Power Cord
120 V AC
AC Power
Supply
Convection Blower
(room air circulation blower)