4. Close the shut off valves A and
C to prevent water leaving the boi-
ler (toggle at 90° to the pipe). Con-
nect 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 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.
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 and 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.
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