21
INSTALLATION
icos system -
Installation and Servicing
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 25.
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, in order 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 21.5 mm
overflow pipe. This size must not be reduced in any
part of its length.
BOILER
cla7771
75mm trap
Sin
k
constitutes
air brea
k
DRAIN
Ground Level
Open end of pipe
direct into gulley
below grating but
above water level
BOILER
cla7772
75mm trap
DRAIN
Sin
k
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 . . . .
INST
ALLA
TION
200214-11.pmd
17/11/2006, 09:35
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