Lennox Merit MPE36 Service Manual page 20

Control Board Wiring (Hot)
L-FAN: Black wire
(hot) to fan motor
L-M: Brown wire
(hot) to flame motor
L-R1 & L-R2: Red wires
(hot) to heater element
Black wire from board to
fusible link
P-L: Black wire (hot) from junction box- to board- to
fusible link
L-Light: Yellow wire
(hot) to ember lights
L-Flame: Purple
wire(hot) to flame
wheel lights