Webasto Thermo 300.102 Service Manual download pdf (Page 26)

WEBASTO THERMO 300 5INSTALLATION

5-13

5.10 Initial Operation

1. Check your installation for:

- loose nuts and bolts.

- exhaust pipe routing and clamp tightness.

- loose hose clamps.

- routing and securing of wiring and heater hoses.

- kinked or pinched hoses.

- battery connection and polarity.

2. Top off or refill cooling system with coolant as per engine manufacturers recommendations.

3. Open shut-off valves and driver’s heater valve.

4. Set vehicle heater controls to maximum heat position.

5. Start the vehicle engine and run it at a fast idle for 10 minutes to purge air from the Webasto coolant heater and

coolant circuits. While the engine is running check:

- hose connections for leaks.

- coolant level in the expansion tank and add coolant as needed.

- use bleeder valve on top of Webasto heat exchanger to purge out trapped air when necessary.

6. Switch “On” Webasto heater and check:

- indicator light on.

- circulating pump in operation.

- heater fan motor in operation.

- presence of combustion after approximately 25 seconds.

7. Shut off the engine.

8. Allow heater to run until coolant is hot and heater cycles off. During this period, monitor system for any coolant or

fuel leaks.

9. Temperature differential between water inlet and outlet should not exceed 10 °C (18 °F) during heating operation.

10. Switch “Off” Webasto heater.

11. Re-tighten hose clamps to 45 in/lb. (5 Nm) and inspect installation for leaks.

14. Install any panels and access covers removed during installation.

NOTE:

Installation with long fuel lines may require a second start attempt to initially prime the fuel system. Cycle ON/ OFF

switch or timer to reset control unit.

NOTE:

Coolant temperature must be below 70 °C (158 °F) to start up heater.

NOTE:

The engine temperature gauge may read a lower temperature than actual coolant temperature at heater outlet. This

difference depends on the location of the temperature sensor on the engine in relation to coolant flow.

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Webasto Thermo 300.102 Service Manual Page 26