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26
classic HE - Installation & Servicing
INSTALLATION
37
WATER CONNECTIONS
1. Remove the plastic plugs from the flow and
return pipes.
2. Make all water connections and check for
water soundness.
36
GAS CONNECTION
Refer to 'Gas Supply ', page 8.
Refer to Frame 2 for gas inlet service dimensions.
A minimum pressure of 20 mbar MUST be available at the boiler inlet
with the boiler operating. The main gas cock is on the left hand side of
the gas control valve, as shown. To facilitate connection the gas cock
may be removed from the gas control valve.
38
CONDENSATE DRAIN
Refer also to the British Gas document: 'Guidance Notes for the
Installation of Domestic Gas Condensing Boilers' (1989).
The boiler comes with a built in condensate siphon trap. The boiler
condensate drain must be connected to a drainage point, preferably within
the building. This condensate drainage should be run in standard
21.5mm overflow pipe. Connection to the boiler is made by fitting the
siphon nut and sealing washer to the threaded siphon outlet.
Ensure that the condensate siphon is full of water before commissioning
the boiler. Refer to Frames 19 and 27.
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 pipes does not give rise to spillage within
the dwelling.
cla7644
Front View
Side View
70mm (2
3
/
4
")
38mm (1
1
/
2
")
Condensate
siphon drain
BOILER
cla7771
75mm trap
Sink constitutes
air break
DRAIN
Ground Level
Open end of pipe
direct into gulley
below grating but
above water level
cla9252
75mm trap
DRAIN
Sink
Ground Level
Open end of pipe
direct into gulley
below grating but
above water level
Air Break
1. INTERNAL TO SINK WASTE
UPSTREAM OF SINK WASTE
TRAP
2. INTERNAL TO SINK WASTE
DOWNSTREAM OF SINK
WASTE TRAP (PREFERRED
METHOD)
Note. ALL EXTERNAL PIPE RUNS MUST BE INSULATED OR UPSIZED TO 32MM - MAXIMUM LENGTH 3M EXTERNAL
39
CONDENSATE PIPE TERMINATION CONFIGURATIONS
continued . . . .
IMPORTANT.
If excessive external pipework cannot be avoided a condensate removal pump (available as an option) 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.
INSTALLATION
201850-6.pmd 21/02/2008, 12:5826