9
It should be piped to drain, pr
eferably within the building,
maintaining a continuous 2.5° (45 mm/m) 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 protection from freezing in cold weather conditions is
also advisable. Note if the appliance is installed in a garage all
pipe work should be in 32 mm. Ensure that the condensate
discharge system complies with any local regulations in force.
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 or I.S.813 in Ireland).
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.
f)
The gas supply line should be pur
ged.
W
ARNING:
Befor
e
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.
a)
The appliance incorporates all the components necessar
y to allow it
to be connected to a sealed central heating system. Refer to Fig. 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.
4
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
*600mm 98in
E
Fr
om vertical drain pipes and soil pipes 150mm
6in
F
Fr
om internal or external corners
+300mm 12in
*1000mm 40in
G
Above adjacent gr
ound or balcony level 300mm 12in
H
Fr
om a surface facing the terminal
+600mm 24in
*2500mm 98in
I
Facing ter
minals
+1200mm 48in
*2500mm 98in
J
Fr
om opening (door/window) in
*not recommended
carport into dwelling
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 *not recommended
O
Fr
om adjacent wall
600mm 12in
P
Fr
om adjacent opening window
300mm 40in
Q
Fr
om another terminal
600mm 24in
R
Minimum height
300mm 12in
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
• •
• •
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
• •
•
•
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
* Recommended by the boiler manufacturing industr
y to prevent
pluming nuisance and damage to buildings.
+ Distances, if plume diverter kit is fitted.
5
3.6
GAS SUPPLY
3.7
CENTRAL HEATING SYSTEM
3.5
CONDENSATE DISPOSAL
The boiler includes a condensate trap that pr
events the
combustion products entering the drain; however an additional
trap is required, a seal of at least 75mm and an air break of at
least 75 mm between the traps (Fig. 5).
The condensate drain connection is suitable for 19mm I/D plastic
push fit or adhesive overflow pipes and fittings.
