23
Installation and Servicing
FLUE OUTLET
SECTION 2 - INSTALLATION
2.13 DETERMINING THE FLUE LENGTH AND FLUE PACKS REQUIRED
Total Maximum Permissible Horizontal Concentric Flue Length
(Measured from centreline of the turret to the outside of the wall terminal)
35 kW Appliances
Total Maximum: 6 metres - minus any flue kit options or bends
Total Maximum Permissible Vertical Flue Length
35kW Appliances
Total Maximum: 7.5 Metres - minus any bends
90º Elbow Kit 60/100 -
(Equivalent flue length resistance =
1M
)
45º Elbow Kit 60/100
- (Equivalent flue length resistance =
0.6M
)
Minimum Horizontal Flue Lengths
(Centre line of turret to outside of wall terminal)
Wall Thickness
‘B’ Pack Flue Type 60/100
Minimum
Permissible Wall
Thickness
Maximum
Permissible Wall
Thickness
Rear Flue
Rear Flue
Telescopic Flue B Pack
(600mm long)
231
429
Telescopic Flue B Pack
(1000mm long)
546
761
IMPORTANT. The boiler must be installed in a vertical position
in accordance to the installation instructions.
FLUE KITS
Telescopic Flue‘B’ Pack (600mm long)
- contains: Flue turret,
telescopic flue incorporating a terminal and rubber wall seals.
Telescopic Flue ‘B’ Pack (1000mm long) ‘B’ Pack
- contains: Flue
turret, telescopic flue incorporating a terminal and rubber wall
seals.
Note. If ‘B’ packs are used on their own then they MUST be
fitted horizontally as the flue inside is designed to slope 1.5
degrees.
When extensions are used the flue duct must incline 1.5 degrees
away from the appliance, to allow the condensate to drain back
to the boiler and out of the condensate drain. It is recommended
that a support bracket is fitted on every 1 metre of pipe work used
and the bracket is located as close to the collar as possible. The
bracketing must ensure a 1.5 degree fall back to the appliance.
Only use water as a lubricant during assembly.
The ‘B’ pack terminal is classed as part of the maximum flue
length.
It is IMPORTANT that all attachments are fitted in accordance
to the installation instructions provided with them.
The flue turret supplied in the ‘B’ Pack has an upper
combustion sample point with a screw cap seal and a lower air
sample point with an air stopper seal. Ensure all caps & seals
are in place.
continued . . . . . .
