21
INSTALLATION
isar - Installation and Servicing
nm8734
Front View Side View
155mm
Condensate
drain
22
CONDENSATE DRAIN
Refer also to the British Gas document: 'Guidance Notes
for the Installation of Domestic Gas Condensing Boilers'
(1989).
Before mounting the boiler on the wall, the condensate
drain (provided in the h/ware pack) must be connected
from the boiler ‘S’ trap to a drainage point, preferably
within the building.
Ensure that the condensate trap is full of water before
commissioning the boiler . Refer to Frame 26.
The routing of the drain must be made to allow a
minimum fall of 1 in 20 away from the boiler, throughout
its length.
The drainage pipework must be arranged so that
obstruction (e.g. through freezing) of external drainage
pipe does not give rise to spillage within the dwelling.
IMPORTANT.
If excessive external pipework cannot be avoided an
additional siphon kit and insulation are recommended to
prevent possible freezing.
All pipework and fittings in the condensate drain system
must be made of plastic. No other materials may be
used.
The drain outlet on the boiler is standard 21.5mm
overflow pipe. This size must not be reduced in any part
of its length.
BOILER
cla7771
75mm trap
Sink constitutes
air break
DRAIN
Ground Level
Open end of pipe
direct into gulley
below grating but
above water level
BOILER
cla7772
75mm trap
DRAIN
Sink
Ground Level
Open end of pipe
direct into gulley
below grating but
above water level
1. INTERNAL TO SINK WASTE
UPSTREAM OF SINK WASTE
TRAP
2. INTERNAL TO SINK WASTE
DOWNSTREAM OF SINK
WASTE TRAP (PREFERRED
METHOD)
* If drain termination is to soil
stack, a 75mm trap will be
required
Note. ALL EXTERNAL PIPE RUNS MUST BE INSULATED
23
CONDENSATE PIPE TERMINATION CONFIGURATIONS
continued . . . .
INSTALLATION
203319-3.pmd 27/03/2008, 08:1521
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