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6
Linea Plus AG
For protection of combustibles, refer to BS
5440:1 where the terminal is less than 2m
(6.6ft) above a pavement or platform to which
people have access (including any balcony or
flat roof the terminal must be protected by a
guard of durable material).
A suitable guard is available from Vokera Ltd.
Part No 018, G.C. No. 301 106
This guard must be fitted centrally over the
terminal. Mark the positions of the fixings, drill
the wall and secure using wall plugs and 3 of
1˚" No.8 plated screws.
4.6
Water Circulation (Central Heating)
Detailed recommendations are given in S6798:
1987 and BS 5449: 1: 1990 (for smallbore and
microbore central heating systems).
4.6.1
The following notes are given for general
guidance.
4.6.2
Pipework
Copper tubing to BS 2871:1:1971 is recom-
mended for water pipe. Jointing should be
either by capillary soldered or with compres-
sion fittings.
Where possible, pipes should have a gradient
to ensure air is carried naturally to air release
points and water flows naturally to drain taps.
It should be ensured as far as possible that the
appliance heat exchanger is not a natural
collecting point for air.
Except where providing useful heat, pipes
should be insulated to prevent heat loss and to
avoid freezing. Particular attention should be
paid to pipes passing through ventilated spaces
in roofs and under floors.
4.6.3
By-Pass
An automatic by-pass is incorporated in the
boiler, but systems should be designed to
ensure that with all radiators turned off a flow
rate of at least 350 litres/hour (1.28 gals/min)
is achieved through the system. See 6.9.4.
4.6.4
System Design
Figs 5 & 5a illustrates typical system layouts
showing options of either, pipe connection
from below as fig. 5, or pipe connection from
above utilising the purpose made duct in the
rear frame of the appliance.
4.6.5
Draining Taps
These must be located in accessible positions
to permit the draining of the whole system. The
taps must be at least 15mm nominal size and
manufactured in accordance with BS 2879:
1980.
Terminal position for fan assisted boiler
(minimum distance)
mm
A
-
Directly below an open window or other
300
opening (e.g. air brick)
B
-
Below gutters, soil pipes or drain pipes
25
C
-
Below eaves
25
D
-
Below balconies or car port roof
25
E
-
From vertical drain pipes and soil pipes
75
F
-
From internal or external corners
25
G
-
Above ground or below balcony level
300
H
-
From a surface facing a terminal
600
I
-
From a terminal facing a terminal
1200
J
-
From an opening in the car port (e.g. door
window) into dwelling.
1200
K
-
Vertically from a terminal on the same wall
1500
L
-
Horizontally from a terminal on the same wall
300
M
-
Horizontally from a vertical terminal to a wall
300
N
-
Horizontally from an opening, airbrick, openable
window, etc.
300
NOTE: The flue must be terminated in a place not likely
to cause a nuisance.
4.5
Air Supply
The following notes are intended for general
guidance.
The room sealed fan flued boiler does not
require a permanent air vent for combustion
air supply.
Where installed in a cupboard or compartment
ventilation is not required.
Fig. 4
