37
Grant Vortex External Module
9 - BOILER SERVICING
Vortex External Module wiring diagram
Colour code: br - Brown, r - Red, bl - Blue, y - Yellow, g/y - Green/Yellow
1
2
3
4
5
6
7
8
9
10
11
12
13
L
L
N
E
L
N
E
L
N
E
Earth to
switch cover
Control box
chassis earth
Control box
chassis earth
Test
switch
Limit
thermostat
C
2
Boiler
thermostat
C
1
Frost
thermostat
1
2
Mains On/Off
switch
5B
2A
4B
1A
Switched Live
Permanent Live
Mains Neutral
Mains Earth
To CH valve if required
Pump Live
Pump Neutral
Pump Earth
Burner Live
Burner Neutral
Burner Earth
g/y
y
g/y
g/y
g/y
g/y
g/y
g/y
g/y
br
br
bl
bl
r
r
r
y
bl
y
y
r
bl
r
r
r
Fig. 32
0
Screw
Slotted ring
Screw Combustion
head
Combustion
head fixing
screw
All models
1 Photocell - The photocell is a push-fit in the burner
body. Carefully pull out the photocell to clean.
2 Burner fan - With the air intake grille or spigot
removed, remove the screws securing the fan
housing cover (R/H side of burner) and remove the
cover. Inspect the fan and housing and clean as
necessary. Replace the cover.
3 Pump filter - With the burner cover removed,
remove the four screws securing the pump end
cover. Remove the filter and wash in kerosene.
Check for the presence of sludge or water. Replace
the filter and end cover, ensure the 'O' ring is in
position.
Re-assemble in reverse order.
To ensure safe and efficient operation of the boiler
it is important that re-commissioning is carried out,
especially combustion checks (CO
2
level, flue gas
temperature and smoke number) after the boiler
has been serviced.
Refer to the Commissioning instructions starting on
page 31.
10 - WIRING DIAGRAM
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