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SYSTEM DESIGN AND PLANNING INFOrMATION
4.0
d)
Gas Supply
The Local Gas Supplier should be consulted at the installation planning stage in order to establish the availability of an adequate supply
of gas. An existing service pipe MUST NOT be used without prior consultations with the gas supplier. A gas meter can only be connected
by the Local Gas Supplier or by his Contractor.
An existing meter should be of sufficient size to carry the maximum boiler input (40kW, see table .1 – Technical data) plus the demand
of any other installed gas appliances, (BS 6891:1988). The supply from the governed meter must provide a steady inlet working pressure
of 0mbar at the boiler.
The gas supply line must be purged. WARNING: before purging open all doors and windows and also extinguish any cigarettes, pipes
and any other naked lights. The complete gas installation must be tested.
The connection to the appliance is a mm copper tail located at the rear of the gas service cock (figure 4.9). Do not use a pipe of smaller
diameter that the boiler gas connection.
e)
condensate Drain
The boiler condensate outlet will accept 1 or mm O.D. (3/4") plastic pipe (see figure 4.10). A plastic drain pipe must be fitted to the
boiler to allow discharge of condensate to a suitable drain. The drainpipe should have a fall of at least ° (1:0) away from the boiler
and must not rise at any point along its length. The pipe should be a minimum of 0mm diameter and supported using suitably spaced
clips in line with the manufacturers installation instructions
Condensate should, if possible, be discharged into the internal household drainage system. If this is not practical, the discharge can be
made externally into the household drainage system or a purpose designed soak away.
Condensate is slightly acidic and the discharge pipe
should be run in a suitable pipe material e.g. PVC, PVC-
U, PVC-C, ABS or PP. Metal pipework is NOT suitable for
use in a condensate drainage system. If the condense
pipe connects to a waste/drain pipe this must also be a
suitable pipe material.
Any condensate discharge pipework external to the
building or in an unheated space must be insulated
to protect against frost. It is also recommended that
the pipe diameter is increased to 3mm for the same
reason.
Typical condensate discharge pipe run arrangements
are shown in figure 4.11.
Figure 4.9
Gas
Connection
Gas
mm
Cock
Figure 4.10
Condensate
Drain Connection
Condensate Trap Cap
(for cleaning the trap)
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