Combustion Air Blower

• 1. intermediate cable
• 1. to glow-spark plug
• 2. to thermo switch terminal C
• 3. to contact breaker

• Disconnect cables from terminal 15 and from terminal 1 of ignition coil.
• Attach intermediate cables to ignition coil terminal and to appropriate cables disconnected from coil.
• Connect tachometer (see illustration) and turn heater on.
• At the working voltage of 12 Volts, speed should be between 6400 and 7100 rpm. If speed deviates considerably, remove combustion air blower and test it.