21
Multi Pass Oil Boilers
3 - GENERAL BOILER INFORMATION
Balanced flue options
3.8
To suit wall thickness (mm)
70/90 Boiler House
90/140 Boiler House
140/160, 160/200 Boiler House
50/70, 70/90 Kitchen & System
90/140 Kitchen & System
140/160, 160/200 Kitchen
70/90 Boiler House
90/140 Boiler House
140/160, 160/200 Boiler House
50/70, 70/90 Kitchen & System
90/140 Kitchen & System
140/160, 160/200 Kitchen
Rear exit
Side exit
Short Kit
Min.
Max.
Max.
Min.
110
120
110
140
240
220
220
230
220
250
240
220
190
200
190
220
420
400
400
410
400
430
420
400
20
20
N/A
30
140
100
120
130
100
150
140
100
100
80
N/A
110
300
260
300
290
260
330
300
260
Concentric low level balanced
flue kits
Standard Kit
1
Apart from a conventional flue/chimney, several
balanced flue options are available for use with the
Multi Pass boiler.
a
Concentric (round) low level horizontal balanced
flue (Yellow system) - available in Short and
Standard kits. Extensions are available which extend
the flue by 225 mm, 450 mm or 675 mm. A 90° and
45° elbow are also available.
The maximum flue length with or without elbows
is 2.0 m.
b
High level horizontal balanced flue (White
system) - allows the flue to rise between
approximately 1.7 to 2.2 m above floor level
before exiting through the rear or side wall. It is
adjustable to suit the following wall
thicknesses:-
Rear
215 to 450 mm (approximately)
Side
120 to 350 mm (approximately)
Extension kits are available which extend the flue
by 950 mm, 450 mm, 225 mm or 275 to 450 mm
telescopic.
c
A vertical balanced flue kit (White system) -
adjustable to 3 m (maximum 6 m with extensions).
Extension kits are available which extend the flue
by 950 mm, 450 mm, 225 mm or 275 to 450 mm
telescopic.
A choice of two waterproof flashings (flat or
pitched) and a wall bracket are also available.
2
The minimum dimensions for positioning the flue
terminal are shown in Fig. 13.
3
If the flue terminal is fitted less than 2 m above a
surface to which people have access, the terminal
must be protected by a guard. A suitable guard is
supplied with the low level flue kits.
The guard must be fitted centrally over the flue
terminal and securely fixed to the wall.
4
The terminal should be positioned so as to avoid
products of combustion accumulating in
stagnant pockets around the building or
entering into buildings.
When a low level concentric (round) balanced flue is
used, the terminal guard must be fitted in all
circumstances to prevent objects entering the flue pipe.
The wall thicknesses quoted above for side flue
assumes that the boiler will be spaced off the wall by a
nominal 20 mm (to provide clearance for the plugs for
the water connections). Water connections may be
taken from one side only, if required (see paragraph 2
in Section 3.11).
