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Grant Euroflame Condensing External Modules
6 - BOILER INSTALLATION
1 Automatic air vent(s) are fitted to the top of the
boiler (see Fig. 8). Check that the small cap on the
top of each air vent is screwed on fully, then
unscrew it one complete turn - the cap remains in
this position from now on.
Ensure the flow pipe is also vented.
2 If the flexible filling loop is used to fill the system, ensure
it is connected and that the valve connecting it to the
system is open and the valve at the front is closed.
A valve is open when the operating lever is in line with
the valve, and closed when it is at right angles to it.
3 Ensure that the mains cold water supply valve is open
(operating lever in line with the valve), then turn on the
mains cold water supply and gradually open the front
valve on the filling loop until water is heard to flow.
4 Vent each radiator in turn, starting with the lowest
one in the system, to remove air.
5 It is important that the pump is properly vented to
avoid it running dry and damaging its bearings. To
gain access to the pump for venting it is necessary
to remove the top panel.
Remove the cap, then unscrew and remove the plug
from the centre of the pump. Using a suitable
screwdriver rotate the exposed spindle about one
turn. Replace the plug and cap.
Fill the sealed system
6.9
6 Check the operation of the safety valve by turning
the head anticlockwise until it clicks. The click is
the safety valve head lifting off its seat allowing
water to escape from the system.
Check that this is actually happening.
7 Continue to fill the system until the pressure gauge
indicates between 0.5 and 1.0 bar. Close the fill point
valve and check the system for water soundness,
rectifying where necessary. Water may be released
from the system by manually operating the safety
valve until the system design pressure is obtained.
8 The system design pressure (cold) should be
between 0.5 bar and 1.0 bar. The pressure is
equivalent to the maximum static head in bar + 0.3
(1 bar = 10.2 metres of water), where the static
head is the vertical height from the centre of the
expansion vessel to the highest point of the system.
9 Close the valves either side of the filling loop and
disconnect the loop.
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