Bosch WR11 series, Руководство по установке и эксплуатации

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2.6 Flue
It is absolutely essential that all instantaneous water heaters
are connected to a suitably dimensioned flue pipe by means
of a gas-tight connection.
The flue pipe should be made of galvanised iron, aluminium,
stainless steel or fibre concrete. Fit as shown in Fig. 5.
A flexible or rigid pipe should be used, fit it inside the flue
socket. The external diameter of the pipe should be slightly
smaller than the dimension specified in the appliances
dimensions table.
Fig. 5 Minimum distances (cm)
2.7 Commissioning
Turn on the gas and water cocks and check all connections
for leaks.
Check flue gas safety device good functioning, proceed as
explained in section 3.6.