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Charnwood LA20i Manual

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11
FITTING THE OPTIONAL ADD-IN BOILER
FLUE CONNECTION AND INFILLING
The boiler replaces the rear firebrick and is reversible so that
the 1’’ B.S.P. male tappings may come on either the left or the
right hand side of the boiler.
The boiler tappings protrude from the sides of the appliance
and it will therefore be necessary to fit the boiler into the
appliance after positioning the appliance in the fireplace if the
fire surround is already fitted.
Before fitting the boiler, remove the front firebars, the side
and back fire plates and the firebricks. Knock out the knock-
outs for the boiler tappings on the appropriate side of the
firebox.
Remove the backnuts and fibre washers from the boiler
tappings and fit the boiler into the appliance. Place the fibre
washers over the tappings on the outside of the appliance and
fit the backnuts, ensuring that the boiler is held tightly against
the rear inside face of the appliance and that the top edge of
the boiler is level or runs uphill to the flow tapping.
When re-fitting the firebricks, note that the short side
firebrick supplied with the boiler must be fitted on the 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.
Make the flue connection with the special 150°elbow part no.
010/AV12. Please note that this item is ordered separately
from the appliance. 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 concrete 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.
®
INSTALLATION INSTRUCTIONS
150°
0
4
5
1
2
3
Fig. 7. Typical Installation
Vermiculite
Infill
Flaunching
Take Flue Pipe
Up To Narrowest
Part Of Chimney.
Part No. 010/AV12
150° Elbow
charnwood
… 11 …


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