Wiring Diagrams - Lennox L20 BF-2 Installation And Operation Manual

WIRING DIAGRAMS

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
Thermocouple
Burner ON/OFF
Switch
Wall Thermostat
(optional)
CIRCULATING BLOWER WIRING DIAGRAM (ALL MODELS
Variable Speed
Control
(rheostat)
Gas Thermopile
Igniter
Pilot
Pilot
Assembly
Vent Spill
Switch
Thermostatic
Switch (fan disc)
Burner ON/OFF
Switch
Wall Thermostat
(optional)
Microswitch for
Control Panel Light
Ground
Convection Blower
(room air circulation blower)
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MODEL L20 DVF-2
Gas
Igniter
Pilot
Thermocouple
Power Cord
120 V AC
AC Power
Supply
Thermopile
Pilot
Assembly
Control
Panel
Light