Installation and operating instruction
Oil condensing boiler WTC-OB 18-B
5 Installation
83311002 1/2018-03 La
25-132
Filling with water
WARNING
Contamination of drinking water
Topping up without system separator can contaminate the drinking water. A direct
connection between heating and drinking water is not permitted.
Top up heating water via system separator.
CAUTION
Damage to the appliance due to unsuitable fill water
Corrosion and scale could damage the system.
Adhere to the requirements for the heating water and the local directives
[ch. 5.1].
During the filling of the system, the three-way valve installed should be in the cent-
ral position. The valve as delivered is in the central position. When the boiler is
switched on, the valve departs from the central position after approx. 20 seconds.
In order for the valve to reach the central position once again, it is essential to re-
activate the boiler and wait for 7 seconds. Switch off the boiler once again before
the 20 seconds have expired.
The system pressure must be a minimum of 1.3 bar.
Open shut off devices.
Undo cap on quick action vent valve.
Gradually fill the heating system using the inlet tap whilst observing the system
pressure.
Vent the system
Check soundness and system pressure.