Sime Format System 25 HE, Installation And Servicing Instructions, Page: 8 / 32

6
lation this boiler and its associated cen-
tral heating system must be flushed in
accordance with the guidelines given in
BS 7593 “Tr eatment of wat er in
domestic hot water central heating sys-
tems”.
– This must involve the use of a propri-
etary cleanser, such as Sentinel X300
or X400, or Fernox Super floc. Full
instructions are supplied with the prod-
ucts, but for immediate information
please contact GE Betz (0151 420
9563) or Fernox (01799 550 811)
directly.
– For long term protection against corro-
sion and scale, after flushing it is rec-
ommended that an inhibitor such as
Sentinel X100, or Fernox MB-1 or Copal
is dosed in accordance with the guide-
lines given in BS 7593.
Failure to flush and add inhibitor to
the system may invalidate the appli-
ance warranty.
– It is important to check the inhibitor
concentration after installation, system
modification and at every service in
accordance with the manufacturer’s
instructions. (Test kits are available
from inhibitor stockists).
– At every service the Aquaguard Filter
(4.9) should be checked and cleaned.
2.5 COAXIAL DUCT ø 60/100
The air inlet-smoke outlet assembly, code
8096201, is included in the standard sup-
ply of the appliance complete with mounting
instructions.
Note: to use only special accessories for
condensing boilers.
2.5.1 Coaxial duct accessories
The accessories to be used for this type of
installation and some of the connecting
systems that may be adopted are illus-
trated in fig. 5.
With the pipe bend included in the kit, the
maximum length of the piping should not
exceed 4.6 meter.
Where the supplementary bend code
8095800 is used, the total length of the
piping can reach a maximum of 2.9 meter.
When the vertical extension code
8086907 is used, the terminal part of the
pipe must always come out horizontally
.
2.5.2 Positioning the
outlet terminals
The outlet terminals for forced-draught
appliances may be located in the external
perimeter walls of the building.
To provide some indications of possible solu-
tions,
Table 3 gives the minimum distances
to be observed, with reference to the type
of building shown in fig. 6.
Fig. 5
KEY
1a-b Coaxial duct kit code 8096201
2
Extension L. 1000 code 8096100*
3 Vertical extension L. 200
with take-off point code 8086907
4 90° additional bend code 8095800*
* Replace the gasket mounted on the
outlet duct ø 60 with the ones supplied
along with the accessory.
– If the terminal discharges into a pathway or passageway check
that combustion products will not cause nuisance and that the ter-
minal will not obstruct the passageway.
– Where the lowest part of the terminal is fitted less than 2 m (78
in) above ground, above a balcony or above a flat roof to which peo-
ple have access, the terminal MUST be protected by a purpose
designed guard. Terminal guards are available from Quinnell,
Barrett, and Quinnell, Old Kent Road, London. State model C2,
(G.C. Part No 382946).
– Where the terminal is fitted within 850 mm (34 in) of a plastic or
painted gutter, or 450 mm (18 in) of painted eaves, an aluminium
shield at least 1,500 mm (59 in) long must be fitted to the under-
side of the painted surface.
– The air inlet/outlet flue duct MUST NOT be closer than 25 mm (1
in) to combustible material.
– In certain weather conditions the terminal may emit a plume of
steam. This is normal but positions where this would cause a nui-
sance should be avoided.
Fig. 6
max 4.6 m
NOTE: Place the duct
horizontally.
Terminal position Minimum spacing
A Directly below an openable window, air vent
or any other ventilation opening
300 mm 12 in
B Below guttering, drain pipes or soil pipes 75 mm 3 in
C/D Below eaves, balconies or carport roof 200 mm 8 in
E From vertical drain pipes or soil pipes 75 mm 3 in
F From internal or external corners 300 mm 12 in
G Above adjacent ground, roof or balcony level 300 mm 12 in
H From a surface facing the terminal 600 mm 24 in
I From a terminal facing the terminal 1,200 mm 48 in
J From an opening in the carport
(eg door, window into dwelling)
1,200 mm 48 in
K Vertically from a terminal on the same wall 1,500 mm 60 in
L Horizontally from a terminal on the same wall 300 mm 12 in
M Horizontally from a vertical terminal to a wall 300 mm 12 in
N Horizontally from an openable window or other opening 300 mm 12 in
P Above an openable window or other opening 300 mm 12 in
TABLE 3