Ferroli SIGMA Installation And Servicing Instructions page 7

2 01 0 Gas Supply
f ecessary the local
the availability of a ade uate supply of gas.
A e isti g service pipe must
A gas meter ca o ly be co
stallatio pipes should be fi tted i accorda ce with BS6891-1988.
Applia ce i let worki g pressure must be 20mbar M N MUM (Natural gas -
Pipework from the meter to the combi atio boiler must be of a ade uate size.
Do ot use pipes of a smaller size tha the combi atio boiler i let gascock co
The complete i stallatio must be tested for gas sou d ess a d purged as described i BS6981-1988. All pipework
must be ade uately supported.
2 02 a Sys m s al
al a i g
Detailed recomme datio s are give i BS6 98 BS
useful heati g suface should be i sulated to preve t a y heat losses or possible freezi g (i.e. i roof spaces or ve tilated
u der oor spaces). Drai taps should be positio ed at the lowest poi t of the system i accessible locatio s to permit
the whole system to be drai ed dow . The drai taps should be i accorda ce with BS28 9. Copper tubi g to BS28 1
Part 1 is recomme ded for water carryi g pipework. Pipework i horizo tal ru s should have a gradie t where possible
to facilitate the removal of air.
typical sealed heati g system illustrated i fi g. .
ypi al s al ully pump
Gas
as supplier should be co sulted at the i stallatio
be used without prior co sultatio with the Local
ected by the Local
sys ms
sure that the boiler heat e cha ger is ot a atural poi t for air collectio . A
a i g sys m
Pump
Sigma
as supplier or by a Local
9 BS6 00 a d CP3 2 Part 2. Pipework ot formi g part of the
Cold water
3
2
1
Filling point
Expansion
vessel
ig a
pla i g stage i
as supplier.
as suppliers Co tractor.
20) or 3 mbar M N MUM (LP
ectio .
A bypass must be fi tted as far
as possible from the boiler if
thermostatic radiator valves
are fi tted thoughout.
order to establish
- 31).