1 If the boiler is to be fitted against the wall, prepare the wall
to accept the heating system pipework. To mark the wall for
drilling, refer to Fig. 1 or 3 for the positions of the pipework
openings in the enclosure sides.
If the boiler is to be installed 'free standing' (i.e. away from
a wall) and the pipework run underground, slide away the
covers to open the two pipe openings in the base of the
boiler enclosure. Using a sharp knife, cut through the
polystyrene in the base, around the edge of the holes, to
allow the flow and return pipes to enter the enclosure.
2 The electrical supply to the boiler should be routed through
the wall in a suitable conduit, such that it enters the boiler
enclosure via one of the unused pipework openings. The
cable can be routed to the front of the boiler, for connection
to the boiler control panel, either over the top or beneath the
boiler heat exchanger. Heat resistant PVC cable, of at least
1.0 mm2 cross section should be used within the boiler
enclosure.
3 The oil supply line should be installed up to the position of
the boiler. Refer to Section 5.4.2 for details. The final
connection into the boiler enclosure can be made with 10
mm soft copper, routed along the base of the enclosure
(either between the enclosure and wall or in front of the
enclosure) to enter through one of the holes located in the
bottom edge side panel, at the front (burner) end.
See Fig. 16
Where it is not practical to use the factory supplied low level
flue, the Outdoor Combi boilers may be fitted with the Grant
'Green System'. This is a twin wall stainless steel insulated
vertical flue system.
An insulated boiler connector elbow, complete with test point,
replaces the low level terminal and flue guard supplied with the
boiler.
The Grant Vertical flue system connects to the elbow and may
terminate at high level or vertically as required. See Fig. 16.
1 The flue must terminate in a down draught free area, i.e. at
least 600 mm above the point of exit through the roof or
preferably above the ridge level.
2 The flue terminal must be at least 600 mm from any opening
into the building, and 600 mm above any vertical structure
or wall less than a horizontal distance of 750 mm from the
terminal.
3
Condensing Combi only -
The condensate can be allowed
to run back into the boiler. A condensate drain at the base of
the flue system is not required.
If the flue terminal is fitted less than 2 metres above a surface
to which people have access, the terminal must be protected by
a guard. The guard must be fitted centrally over the flue
terminal and securely fixed to the wall
Condensing Combi only - It is important to ensure that all
joints in the flue system are scaled and that condensate
cannot escape. Up to 1.5 l/h of condensate can be produced
in a conventional flue system.
Fitting instructions for the high level flue (Green system) is
supplied with the flue kit.
6.3
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High level flue - Green system
Note:
Pipework should be insulated where it passes
through the wall into the boiler enclosure.
Combi 90 V3 and Combi Max only - When using gas oil
the flue must terminate a minimum of 2 metres above
outside ground level.
The items listed below are available from your local stockist.
Item
Combi 90 V3, Combi Max & Condensing Combi 26 Part No.
Condensing Combi 36 Part No.
Outdoor starter elbow
GKM90
GKM200
150 mm extension
GX 50/90
GX 150/200
250 mm extension
GX250/90
GX250/200
450 mm extension
GX450/90
GX450/200
950 mm extension
GX950/90
GX950/200
195-270 mm adjustable extension
GXA250/90
GXA250/200
45˚ elbow
GE45/90
GE45/200
High level 90˚ terminal
GTH90
GTH200
Vertical terminal
GTV90
GTV200
Wall bracket - standard
GWB90
GWB200
Wall bracket - extended
GEB90
GEB200
Outdoor starter - straight
GKM90C
GKM200C
Straight terminal
GTL90
GTL200
Preparations for installation
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6.2
Outdoor Combi 90 V3, Combi Max and Condensing Combi
27
6 - BOILER INSTALLATION
