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Thermo Pro 90 Connection to the Vehicle Cooling System

The cooling system must be bled carefully before using the heater for the first time or after replacing the coolant.

Proper venting of trapped air can be identified by the circulating pump operating almost silently. Poor bleeding may

cause the resetting temperature limiter to trip while the heater is in operation.

7.2 Various Plumbing Configurations

Select the appropriate plumbing configuration according to the customers requirements and the vehicle system type.

Figure 9 illustrates an engine preheat / boost heat configuration.

Figures 10 through 13 illustrate configurations for bunk heat and engine preheat / boost heat.

Figure 14 illustrates a system for vehicles with continuous fan operation or high amperage heat exchanger fan designs.

In this case, the addition of a low amperage draw, auxiliary heat exchanger system is recommended.

Figure 9: System configured for engine pre-heating and boost heating.

Figure 10: System configured in a “series” fashion with both heat exchangers.

1. Coolant supply connection

2. Vehicle heat exchanger

3. Coolant pump

4. Thermo Pro 90 heater

5. Coolant return connection

6. Engine coolant pump

7. Thermostat

1. Coolant supply connection

2. Vehicle heat exchangers

3. Coolant pump

4. Thermo Pro 90 heater

5. Coolant return connection

6. Engine coolant pump

7. Thermostat

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Webasto Thermo 90 Installationshandbuch Seite 14