W
EBASTO
S
CHOLASTIC
S
ERIES
5INSTALLATION
5-17
5.9 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.
- disconnect control thermostat on Webasto heat exchanger (red and green wire, see page 2-1, figure 2-1,
position 13).
2. Top off or refill cooling system with coolant as per engine manufacturer’s recommendations.
3. Connect power/ switch extension harness to waterproof plug.
4. Open shut-off valves and driver’s heater valve.
5. Set heater controls to maximum heat position and turn off Air Conditioning if applicable.
6. Switch “On” Webasto heater and check:
- green indicator light on.
- circulating pump in operation.
7. Start the vehicle engine and run it at a fast idle for 10 minutes to purge air from the Webasto coolant heater and
all of the heat exchangers. While the engine is running check:
- hose connections for leaks.
- coolant level in the expansion tank and add coolant as needed.
- use bleeder valve screw on top of Webasto heat exchanger to purge out any trapped air (see page 2-1, figure
2-1, item 26).
8. Shut off the engine.
9. Plug in control thermostat, the blower motor starts and the fuel pump primes the fuel lines. After 10 to 25 sec. the
fuel solenoid opens and the electronic ignition coil ignites the air fuel mixture.
NOTE
Installations with long fuel lines may require a second start attempt to prime the fuel system. Cycle switch or timer off
and on to reset control unit. Coolant temperature must be below 68 °C (155 °F) at heater before heater will begin
heating operation.
10. Allow heater to run until coolant is hot and heater cycles off. During this period, monitor system for any coolant or
fuel leaks.
NOTE
The engine temperature gauge may read a lower temperature depending on the location of the temperature sensor
on the engine.
11. Temperature differential between water inlet and outlet should not exceed 10 °C (18 °F) during heating operation.
12. Switch “Off” Webasto heater.
13. Re-tighten hose clamps to 5 Nm. (45 lb/in.) and inspect installation for leaks.
14. Install any panels and access covers removed during installation.
