Mazda 2006 Mazda5 Technical Information Page 190

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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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