Lennox Merit MPE36 Service Manual page 39

Blower wiring 240 volt
• Note: 240 VAC operation:
• Blue wires N1 & N2 run directly from electrical junction box
to the heater element. (Blue wires are not used in 240VAC
and must not be connected to a power source in the
junction box. Blue wires should be capped with wire
nuts to prevent accidental contact with power supply)
• Orange (hot) wire also runs directly from the electrical
junction box to the heater element. Orange wire is connected
to Hot (Red or Black power supply in the junction box)
• Black (hot) wire runs from junction box to the control board
and then to the fuse plate assembly for the heater Black wire
is connect to Hot (Red or Black power supply in the junction
box)
• White (neutral wire) runs from the junction box to the control
board.
From left:
Black
White
Orange
Blue
Blue