Boiler Drainage And Pressure Relief System - Webasto DUAL TOP RHA 100 Installation Manual

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Boiler drainage and pressure relief system

The heater is equipped with
1 a drainage system that drains the water contents automatically as a
protection against frost (boiler water temperature below 6 ºC).
It is also possible to drain the unit manually;
2 a pressure relief system that prevents pressure above 3.5 bar inside the
boiler.
In both cases, water is drained off via a hose outlet exiting at the bottom
of the heater. The water is discharged under the vehicle.
The drain hose of the pressure relief valve and the solenoid valve (No. 9,
Fig. 2) should be positioned and routed so that the water flows unimpaired
out of the vehicle and onto the ground.
To completely drain the entire water system and the boiler, it is advisable
to use clean compressed air (according to "Compressed air purity classes").
For this purpose, open all valves, connect compressed air of approx. 2 bars
to hot water tap and leave connected until water no longer exits.
Boiler drainage and pressure relief system
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