Operation Manual

5.4 AIR/FLUE SYSTEM
The flue system
is
a
p~rt
of
the appliance and
is
approved as such. Use only flue
systems supplied by Marco that are approved for use with this boiler.
Both horizontal and vertical flues can
be
used with these boilers. The following
maximum flue lengths apply. These are based
on
the use
of
one elbow for the
horizontal flue and
no
elbows for the vertical flue.
Flue Type
Model
Maximum Flue Length
Horizontal 24CPM 7m
Horizontal
30CPM 4m
Vertical 24CPM
8m
Vertical 30CPM
Sm
Each 90 degree elbow added to the flue decreases the maximum length available
by 1m. Eacfl 45 degree elbow added to the flue decreases the
max1mum
len_gth
ayailable by 0.5m. Please contact Marco for more details when designing true
kitS.
The horizontal flue pipe may
be
cut down to the length required.
The flue must
be
fitted with a
or
downwards incline towards the boiler to
ensure condense flows back into the boiler.
In
cold or humid weather, water vapour
in
the flue gas may condense when
leaving the flue terminal. Care must
be
taken when locating the boiler to avoid
pluming causing nuisance to the occupier of the adjacent property.
The installer must ensure that an adequate seal
is
formed between the inner and
outer pipe and the corresponding part
in
any elbow or connector. The connection
can
be
eased by the use of silicon based lubricant. Normal grease/oil or sealant
are not allowed.
The black glastic terminal must
be
positioned with the rain shield to the top
on
the
horizontal flue system.
The air/flue terminal must
be
exposed to the external air and allow free passage
of air across it at all times.
The minimum acceptable dimension between the terminal and
obstructions/oQenings are outlined
in
chapter 4.2. For domestic and Park homes
refer to BS5440.
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