
Water Heater System HVAC
Operation
• The water heater control module outputs a signal to the blower fan and the fuel pump,
which then deliver air and fuel to the unit.
• Within the unit, fuel is vaporized and mixed with air, and then sent to the combustion
chamber.
• The mixture is ignited by the glow plug in the combustion chamber.
• Engine coolant temperature is raised as it circulates along the outside of the combustion
chamber.
M5_07010
1 Blower fan 8 Flame sensor
2 Temperature sensor 9 Electronic control module
3 Combustion chamber A From fuel metering pump
4 Overheating sensor B Coolant outlet
5 Heat exchanger C Coolant inlet
6 Burner D Exhaust
7 Glow plug E Fresh air supply
07-14 Service Training Mazda5
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