19
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.
Union nuts G
¾
: 30 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
Connections on the heating water side
If the connections have not been fitted previously,
make the connections on the heating water side.
A
B
Fig. 7
A
Heating flow Ø 22 mm (male thread)
B
Heating return Ø 22 mm (male thread)
Installation sequence
Fitting the boiler to the wall mounting bracket
(cont.)
6174240
Installation
