4.
Close the shut off valves
A
to pre-
vent water leaving the boiler (toggle
at 90 to the pipe). Connect a hose-
pipe to outlet
D
ready to vent the
boiler later.
5.
Turn valve
B
to the draining posi-
tion (toggle to the front). This will
allow the system pressure reading
to be displayed on the boiler control
panel.
6.
Fill and vant 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.
7.
Turn on valve
B
(toggle to the
rear) to allow water into the boiler
and at the same time turn valve
A
to the draining position (toggle to
the front) with the drain toggle open
(a jubilee type clip will ensure no
water loss an secure the hose in
place on the drain point).
8.
Fill heating system. (minimum sys-
tem pressure > 1.0 bar).
The actual system pressure is dis-
played electronically on the boiler
display.
9.
Shut off valve
C
(toggle down).
Commissioning and testing
(cont.)
49
Installation
58
62
670
GB
Installation
