Circuit Board - Newmac NM-75K Operating Instructions Manual

• Turn the Nozzle rod to anti clockwise and separate with Burner head.
• Carefully remove nozzle from Nozzle rod using 5/8" socket wrench.
• Blow compressed air through face of nozzle (This will remove any dirt).
• Reinstall nozzle into Nozzle rod and tighten firmly (80-100 inch-pounds).
• Reinstall spark plug into Nozzle rod.
• Turn the Nozzle rod to clockwise and Assemble with Burner Head.
• Attach igniter wire to spark plug.
• Attach fuel and air line hoses to Nozzle rod.
• Reinstall fan blade and upper shell.
• Remove upper shell.
• Remove fan.
• Remove igniter wire from spark plug.
• Remove spark plug from Nozzle head using medium Phillips screwdriver.
• Clean and regap spark plug electrodes to .140" (3.5 mm) gap.
• Reinstall spark plug into Nozzle head.
• Attach igniter wire to spark plug.
• Reinstall fan and upper shell.
PHOTOCELL
• CLEAN PHOTOCELL ANNUALLY OR AS NEEDED.
• Remove upper shell.
• Remove fan.
• Remove photocell from its mounting bracket.
• Clean photocell lens with cotton swab. TO REPLACE:
Remove side cover near power switch.
• Disconnect wires from circuit board and remove photocell.
• Install new photocell and attach wires to circuit board.
• Reinstall fan and upper shell.
• Remove upper shell.
• Remove fan.
• Remove photocell from its mounting bracket.
• Clean photocell lens with cotton swab. TO REPLACE:
Remove side cover near power switch.
• Disconnect wires from power switch and remove side
cover.
• Disconnect wires from circuit board and remove photocell.
• Install new photocell and attach wires to circuit board.
• Replace switch wires to power switch and side cover.
• Replace fan and upper shell.
Maintenance
-11-
Nozzle Face
Gap
Spark Plug Replacement
PHOTO CELL
WIRE
3VE49A Only
Photocell Replacement for
Nozzle Rod
Nozzle
Spark Plug
Nozzle Rod

CIRCUIT BOARD