19
fig. 17
GW 407/1
fig. 18
GW 525/0
4.6.3 Gas supply (fig. 17)
The boiler is supplied with a 20 mm x
15 mm gas service valve (7). Fit the
20 mm compression fitting to the
boiler gas inlet (3) and tighten. Install
a gas supply pipe not less than 15 mm
diameter and connect to the gas service
valve. (Ensure the gas supply pipework
is adequately sized such that a 20 mbar
- 8" w.g. – gas pressure is available
at the boiler inlet at full flow rate).
Tighten all union connections.
4.6.4 Condensate discharge
(fig. 18)
Insert the boiler condensate drain (1)
by at least 50 mm into a condensate
discharge pipe (2). The condensate
discharge pipe should be minimum
19 mm internal diameter and be
made of an acid resistant material
(e.g. plastic overflow pipe).
The discharge pipe from the boiler
condensate drain must have a conti-
nous fall and preferably be installed
and terminated within the building to
prevent freezing.
The discharge pipe must terminate in
a suitable position, e.g.:-
connecting into the internal stackpi-
pe of the property (at least 450 mm
above the invert of the stack). A
trap giving a water seal of at least
75 mm (3) should be incorporated
into the pipe run, and there must be
an air break (4) in the discharge
pipe upstream of the trap.
connecting into the internal dischar-
ge system of the property such as a
sink or washing machine waste.
The connection should be upstream
of the sink / washing machine
waste trap. (If the connection is
downstream of the waste trap then
an additional trap giving a water
seal of at least 75 mm (3) and an
air break (4) must be incorporated
into the pipe run, as (a)).
terminating in a gulley (5) below
grid level (6) and above the water
level.
at a condensate absorption point
('soakaway')-7.
O
a
O
b
O
c
O
d
