11
5
FLUE TERMINAL POSITION
Position Minimum
spacing
A
Dir
ectly below an openable window,
300mm 12in
air vent, or any other ventilation opening
B
Below gutter
, drain/soil pipe
75mm
3in
C
Below eaves
200mm
8in
D
Below a balcony
200mm
8in
*2500mm 98in
E
Fr
om vertical drain pipes and soil pipes 150mm
6in
F
Fr
om internal or external corners
300mm 12in
*internal corners
t 1000mm 40in
G
Above adjacent gr
ound or
balcony level
300mm 12in
H
Fr
om a surface facing the terminal
600mm 24in
t 2500mm 98in
I
Facing ter
minals
1200mm 48in
*2500mm 98in
J
Fr
om opening (door/window) in
1200mm 48in
carport into dwelling
*not recommended
K
V
ertically from a terminal on the
1500mm 60in
same wall
L
Horizontally fr
om a terminal on the
300mm 12in
same wall
M
Adjacent to opening
300mm 12in
N
Below carpor
t
600mm 24in
*not recommended
O
Fr
om adjacent wall
300mm 12in
P
Fr
om adjacent opening window
1000mm 40in
Q
Fr
om another terminal
600mm 24in
R
Minimum height
300mm 12in
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A
B,C
G
K
M
A
E
F
F
K
B,C
G
G
K
K L
L
J
F
H,I
D,N
C
Q
O
O
P
R
SPECIAL REQUIREMENTS FOR A
VERTICALLY BALANCED FLUE
300mm
Min
430mm
Min
d)
If the appliance is installed in a r
oom or internal space with other
opened flued appliances, then the size of the air vent necessary
should be calculated in accordance with BS 5440-2 Table 2.
e)
Wher
e an open flued system is used, and the flue duct air inlet is
within a compartment then high and low level air vent are necessary
in the compartment, the size of the vents should be calculated in
accordance with BS 5440-2 Table 2.
3.5
CONDENSATE DISPOSAL
The condensate drain connection is suitable for either 21.5 mm or
22 mm plastic push fit or adhesive overflow pipes and fittings. It
should be piped to drain, preferably within the building,
maintaining a continuous 2.5° fall away from the appliance. If the
drain is routed to outside it should be to a drain or soak away,
and any external pipe work should be in 32 mm. Insulation to
protect from freezing in cold weather conditions is also advisable.
3.6
GAS SUPPLY
a)
The Gas Supplier should be consulted at the installation planning
stage in order to establish the availability of an adequate supply of gas.
b)
An existing ser
vice pipe MUST NOT be used without prior
consultation with the Gas Supplier.
c)
A gas meter can only be connected by the Gas Supplier or by their
contractor.
d)
An existing meter and/or pipe work should be of suf
ficient size to
carry the maximum appliance input plus the demand of any other
installed appliance. (BS 6891: 1988).
A minimum of 22 mm diameter pipe work is
recommended within 1000 mm of the appliance gas cock.
e) Natural gas appliances:
The gover
nor at the meter must give a
constant outlet pressure of 20 mbar (8 in.wg) when all appliances on
the system are running.
Pr
opane appliances:
The r
egulator must give a constant outlet
pressure of 37 mbar (14.9 in.wg) when all appliances on the system
are running.
f)
The gas supply line should be pur
ged. WARNING: Before purging
open all doors and windows, also extinguish any cigarettes, pipes, and
any other naked lights.
g)
The complete installation must be tested for gas tightness.
3.7
CENTRAL HEATING SYSTEM
a)
The appliances incorporate all the components necessar
y to
allow them to be connected to a sealed central heating system.
Refer to Figure 8 for a typical system design, which incorporates
radiators, and a drain facility that must be provided at the lowest
point in the system to allow complete drain down.
b)
The installation should be designed to operate with a flow
temperature of up to 95°C.
c)
A sealed system must only be filled by a competent person.
d)
The available pump head for the appliances ar
e given in
Figure 6.
* Recommended by the boiler manufacturing industry to prevent
pluming nuisance and damage to buildings.
t Distances can be reduced if plume diverter kit is fitted.
