18
3. Only remove the locking clip under the gas pipe
union nut once the appliance has been installed.
Clip is no longer required.
4. Tighten union nuts so that they form a tight seal.
Tighten the union nuts as tightly as necessary and
ensure that the components are undamaged and
are functioning correctly throughout service life.
Observe torque settings if a torque wrench is avail-
able.
Check for gas tightness to BSI 6891.
Torque settings:
■
Union nuts G ¾: 30 Nm
■
Union nuts G ½: 24 Nm
When carrying out any work on gas connection fit-
tings, hold with a suitable tool. Never transfer any
forces to the internal components.
5. Tighten locking ring fittings so that they form a tight
seal:
1 turn beyond finger-tight
Fitting the boiler to the wall mounting bracket
Note
Various installation components can be found in a sep-
arate pack. Keep the installation components safe, as
they will be required for later installation.
Installation sequence
Mounting the boiler and making connections (cont.)
6179762
Installation
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