Technical data

15
STRATA1
13.0 room sealed flue installations (contd)
Extending the flue gas discharge vertically away
from a room sealed wall terminal.
The Strata 1 boiler is a fully condensing appliance with very low flue gas temperatures.
Consequently, the flue gas discharge is commonly seen as a white vapour plume, Whereas this is not
harmful when properly discharged into the atmosphere outside of a building from a correctly operating
appliance, the white vapour plume may cause, in certain applications a visual nuisance.
It must also be considered that a flue termination will drip condense water and may cause an ice hazard
below the terminal position
If it is considered that pluming or dripping from the end of a standard wall terminal may create a
nuisance, then as an alternative, the vertically extendable discharge wall terminal is available see figs 14 and
16. This creates a local room sealed intake for combustion air but allows the installer to extend the 80 mm
PPS flue gas tube to a point where pluming or dripping discharge will not cause a visual nuisance or hazard.
1. Lubricate male ends of concentric bend
with silicone grease and locate bend into
flue and air tube connection sockets on
the top of the boiler and gently push fully
home.
2. Slip flue tube and terminal assembly
through prepared hole in the outside wall.
3. Locate wall bezel plate loosely onto air
tube.
4. Lubricate male ends of concentric flue
tube and female sockets of flue bend
lightly with silicone grease. Insert
concentric tubes into bend and gently
push fully home. Ensure plain section of
external part of air inlet tube is located
uppermost.
5. Make good internally and externally gap between air tube and prepared hole through wall.
6. Slip on external wall bezel plate.
7. Fix internal and external wall bezel plates with fixings provided.
Where a flue terminal discharges through a wall within 2m of ground level or balcony etc then the terminal
should be fitted with an appropriate sized terminal guard to prevent that the terminal may be touched.
Installation of Vertical Discharge Wall Terminal
In order to determine the length of concentric tube required to correctly terminate a side outlet
extended vertical discharge arrangement, the following procedure should be followed.
1. Measure wall thickness W in mm - see fig 14 overleaf.
2. Measure distance between side of appliance and inside face of wall L1 in mm - see fig 14 overleaf.
3. Mark off and cut flue tubes following guidance shown in fig 15 overleaf. Flue tubes should be cut to
length TL in mm. Both inner and outer tubes should be cut flush with each other, square and any burrs
removed.
Where TL required, is greater than 610 mm, (*850mm) then additional lengths (as appropriate) of
80/125 concentric tube will be required to extend the vertical discharge wall terminal.
* available 01/10/00
Method of assembly of horizontal concentric flue
system using standard wall terminal.
13
4
6
2
Fig 13.
Plain
Section
Uppermost