Installation Manual

53
5350 485 GB 08/2007
Further details regarding the individual steps
Filling the heating system
Note
Unsuitable fill water increases the
level of deposits and corrosion
and may lead to boiler damage.
• Thoroughly clean and flush the entire
heating system prior to filling with water
to BS7593
• Only use fill water of potable quality.
• Soften fill water harder than 3.0 mol/m
3
,
e.g. using a small softening system for
heating water (see Viessmann Vitoset
price list).
• An antifreeze additive suitable for heat-
ing systems can be mixed with the fill
water. The antifreeze manufacturer
must verify its suitability.
1. Check the inlet pressure of the
expansion vessel.
2. Close the gas shut-off valve.
3. Fill and vent the system through your
external temporary filling loop ensuring
that most of the air has been removed
from all drain and vent points on the
system. (Minimum system pressure
>0.8 bar).
4. If the control unit was already switched
ON before filling began: Switch ON
the control unit and activate the filling
programme via code “2F:2”. See page
54 for coding 2
5. Close boiler drain valve .
6. Close the shut-off valves on the heating
water side.
A
Filling program
In the delivered condition, the diverter
valve is set to its central position, enabling
the system to be filled completely. After
switching ON the control unit, the diverter
valve is no longer in its central
position.
The diverter vavle can be moved via code
2F:2 into the central position. In this
position, the control unit can be switched
OFF and the system can be filled
completely.
Vitoden 200-W pages 44 - 4/9/07 7:56 pm Page 10