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33
Fig. 7.2
• Before slackening the main condensing
breather pipe exchanger 21 in Fig. 7.3 con-
nect a small draining pipe to the hose nozzle
to drain water out.
21
Fig. 7.3
• Gradually open stopcock at the filling point
connection to the c.h. system until water is
heard to flow; do not open fully.
• Open each radiator air vent starting at the
lowest point of the system and close it only
when clear water, free of bubbles, flows out.
• Purge the air from the pump by unscrew-
ing the pump plug 33 (Fig. 7.2); release the
pump shaft by turning in the direction indi-
cated by the arrow on the information plate.
COMMISSIONING
• Replace the pump plug.
31
• Continue filling the system. The actual read-
ing should ideally be 1,3 bar and not less
than 0,3 bar.
• Close all air release valves on the c.h. sys-
tem.
• Inspect the boiler and the system for water
tightness and remedy any leaks discovered.
• Cold flush the system to remove any loose
particles and any system debris before start-
ing the boiler for the first time
The flushing procedure must be in line
with BS7593:2006 Treatment of Water in
d.h.w. c.h. Systems.
When the installation and second filling
are completed turn on the c.h. system and
run it until the temperature has reached the
boiler operating temperature. The system
must then be immediately flushed through.
This procedure must be repeated twice
more.
During this operation a c.h. flushing de-
tergent must be used in the quantities as
specified by the appropriate manufacturer,
whose function it is to dissolve any foreign
matter which may be in the system.
INHIBITION (Primary Heating Circuit)
On the final refilling of the heating system it
is important to ensure the system water is
treated with a suitable scale and corrosion in-
hibitor in accordance with the manufacturers
instructions.
7.6
The full length of the condensate pipe should
be check for leaks.
Before running the boiler, ensure that the built
in condensate trap and any other trap in the
drain system is correctly filled with water.
Condensate pipe and traps
- 63 -
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