30
Grant Vortex External Module
6 - BOILER INSTALLATION
Burner components
6.10
Fig. 21 - RDB burner components
1 Pump
2 Control box
3 Reset button with lock-out lamp
4 Flange with gasket (do not remove from boiler)
7
8
1
2
3
5
4
6
5 Air damper adjustment screw
6 Air supply tube connection (balanced flue)
7 Pump pressure adjustment screw
8 Pressure gauge connection
Note:
Remove the factory fitted air inlet spigot adaptor (item 6, above) from the air intake on
the top right hand side of the burner and fit the grey plastic air inlet grille in its place.
See Note below
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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