Charnwood DX20i MkII - Manual (Page 9)

same side as the boiler tappings. One
of the original side firebricks is fitted
on the other side, and the rear
firebrick is discarded. The firebricks
must be fire cemented into position,
wetting the firebox will improve the
adhesion.
Replace the back fireplate, the side
fireplates, the front firebar and the
throat plate.
Connect the boiler to the heating
system ensuring that the flow pipe
rises from the boiler. Fill the system
with water and check for leaks.
FLUE CONNECTION
AND INFILLING
Make the flue connection with the
special 150° elbow part no.
010/AV12. Please note that this item
is ordered separately from the
appliance. a short length of flue pipe.
The legs of the elbow may be cut on
site to suit the chimney. Also note
that the legs of the elbow are
different lengths to enable some
situations to be catered for by turning
the elbow around.
The end of the flue pipe must line up
with the centre-line of the chimney,
and must also extend to the point
where the chimney narrows to its
final size. Any large voids must be
filled and flaunched to the flue pipe
to ensure that all soot deposits can be
cleared when the appliance is swept,
and to prevent problems with the
operation of the appliance.
Ensure that the flue pipe is not
obstructed or restricted in any way
and that all joints are well sealed.
Before infilling cover the front of the
appliance to protect it. Ensure that
the flue pipe is central and then fill
the space between the body of the
appliance and the structural
brickwork with vermiculite (e.g.
micafil or similar) concrete. Ensure
that there are no air pockets. The
recommended mix is six volumes of
vermiculite granules to one volume of
portland cement thoroughly mixed
together. Enough water should be
added so that no more than one or
two drops of water are released when
a handful of the mixture is squeezed.
After filling with vermiculite flaunch
the top of the flue connector pipe to
the chimney with lime mortar.
Ensure that the flue pipe is well
sealed to the chimney.
Make good the hole(s) in the
chimney breast making sure that it is
completely airtight. A typical
installation is shown in Fig. 7.
In most installations it will be
possible to sweep the chimney
through the appliance. If this is not
possible then some alternative means
(such as a soot door), must be
provided.
Vermiculite
Infill
Flaunching
Take FluePipe
Up To Narrowest
Part Of Chimney.
Fig. 7. Typical Installation
150º Elbow
Part No. 010/AV12
150º
Drain Cock
G
ra
v
it
y
R
et
u
rn
2
8
m
m
G
ra
v
it
y
F
lo
w
2
8
m
m
Indirect Hot Water Cylinder
Cold Water Tank
Overflow
Feed and Expansion Tank
22mm Open Vents
Overflow
Domestic Hot Water Draw Off
Drain Cock at L owest Point
Using Indirect Hot Water Cylinder
Fig. 6. Typical Hot Water System
Page 9
HV 7/96