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Thermo Pro 90
6
Integration in the coolant system
6.1 Connection
Only thermostats which start to open at
< 65°C should be used in thermostat circuits.
The heater is connected to the vehicle cooling system as shown in Fig. 3. The
amount of coolant in the circuit must be at least the volume specified in Chap-
ter 14 Technical data (page 56).
Coolant:
Mix ratio 50:50 (e.g. Glysantin®/water).
Permissible water/glycol (monoethylene glycol) mixes:
Glycol [%]
Minimum
33
Maximum
60
The heater should preferably be integrated in the coolant system at the inlet of
the vehicle heat exchanger.
Coolant running out of the system should be collected in a suit-
able container.
The coolant hoses supplied by Webasto should always be used. If this is
not possible, the hoses must comply with DIN 73411 material class B as a
minimum. The hoses should be installed without kinks and – for problem-free
bleeding – as far as possible with an upward slope away from the heater.
Hose connections must be secured against slipping using hose clips.
The hose clips should be tightened with a tightening torque of
4 Nm.
Before initial start-up of the heater, or following replacement of the coolant,
the cooling system should be bled carefully. The heater and lines should be
installed in such a way that static bleeding is ensured.
Correct bleeding can be identified by the fact that the coolant pump is making
very little noise.
Insufficient bleeding can lead to a malfunction resulting from overheating in
heating mode.
Water [%]
40
67
6.2 Inspection
Once the heater and all coolant-carrying components have been installed, the
entire coolant system should be checked for leaks at the system pressure speci-
fied by the vehicle manufacturer.
Coolant circuit
45
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