Webasto Thermo Top Evo 5 Diesel connections

This entry is the 12 V diesel Thermo Top Evo 5 kW, not the petrol model or a complete vehicle heating system. The technical tables, pages 29 and 31, give 31 W at maximum heating for the heater and 14 W for the U4847econ coolant pump. The heater figure explicitly excludes both that pump and the vehicle blower. The catalog's 31 W / 12 V calculation therefore represents only the heater's nominal running load, not startup demand or total system current.

The W-bus car diagram, page 20, shows the X2 power pair and the separate X1 control connector. X1 pin 2 is W-bus, pin 5 controls the vehicle blower and pin 6 serves the fuel pump. These are dedicated harness functions, not interchangeable battery terminals. Signal markers on the component preserve those distinctions without pretending to reproduce the entire loom.

The pin table, page 23, distinguishes standard car and RV/HD versions: pins 1, 3 and 4 have additional functions only in the applicable RV/HD arrangement. Do not apply an analogue on/off feed to a standard W-bus heater based on another variant's diagram.

The car diagram includes separate F1 20 A heater and F2 30 A blower branches, with further low-current control protection. This is not one 20 A two-wire appliance. Webasto states on page 19 that the diagram's cable cross-sections apply to lengths below 4.5 m. Use the vehicle-specific installation and supplied harness to establish the actual branch layout, wire lengths and blower control.

Route coolant, combustion air, fuel and exhaust according to the installation manual before connecting power. The first-start procedure, page 28, requires the appropriate Webasto diagnostic process, a cold enough coolant circuit to permit firing, and checks for fuel and coolant leaks. Maintain supply through the controlled shutdown sequence. The page is an overview because an isolated pair of supply wires cannot demonstrate that this heating system is complete.