8
Main Components and Operating Concept
Main parts of PH52W Engine Heaters
Here is a basic overview of the operation of the heater.
• Fuel is delivered to the heater via the heater’s fuel pump.
• Combustion air is delivered to the heater via the heaters 12v combustion air blower.
• Fuel is atomized and the fuel / air mixture is ignited using a glow pin.
• The flame is contained in a flame tube and exhaust gases expelled.
• The heater’s coolant pump takes cold coolant from the engine, circulates it through the heater’s
water jacket, then it pumps hot coolant back to the engine.
*Figure O2
1. Overheat Sensor
2. Heat Exchanger
3.
Temperature
Sensor
4. Coolant Inlet
5.
Atomizer
6. Glow Pin / Flame Sensor
7. Coolant Outlet
8. Blower Motor
9. Combustion Air Blower
10. Return Coolant
11. Coolant Pump
12. Fuel Metering Pump
13. Combustion Air Inlet
14.
ECU
15. Fuel Inlet
16. Exhaust Outlet
17.
Flame
Tube
18. Heat Exchanger
