Charnwood DX20i MkII - Manual (Page 8)

output sufficient for domestic hot
water heating. If the boiler is fitted
then the room heating will be
reduced.
The hot water system should be a
gravity circuit and must be correctly
vented as shown in Fig. 6.
A double feed indirect hot water
appliance. In some situations it may
be necessary to shield the beam or
mantelpiece to protect it.
PREPARATION OF
FIREPLACE
Before fitting the appliance into an
existing fireplace remove the fireback
and any loose in-fill material.
The hearth, surround and opening for
the appliance must conform with
Figs. 5 and 6. The flat area around
the opening must be a minimum of
750 mm wide and 660 mm high.
Ensure that the hearth and the base
in the opening are flat, level, and at
right angles to the surround.
Make a hole in the front of the
chimney breast to give access for
infilling and fixing the flue pipe. If
the optional boiler is to be fitted it
will also be necessary to make a hole
in the side of the chimney breast to
give access for the pipework.
FITTING THE FIRE
In some cases it may be necessary to
place the connecting flue pipe in the
chimney before fitting the fire into
the fireplace.
Apply fire cement to the rear face of
the sealing flange on the appliance.
Fit the appliance into the opening
ensuring that it is central and that a
good seal is made between the
sealing flange and the face of the
surround.
Remove any excess fire cement from
around the sealing flange.
The appliance should be screwed to
the hearth through the holes at the
base of the sealing flange.
HOT WATER SYSTEM
The optional add-in boiler which may
be fitted in the appliance has an
Minimum
400 mm
This Dimension Is The
Minimum Level Area
Required To Enable The
Ashpit Door To Be
Opened.
For Overall Sizes Of
Hearth See The
Section Titled "Hearth".
Of Hearth
750 mm
Surround And Opening
Dim. A:
Dim. B:
Max. 575mm (22 2/3")
Min. 555mm (21 3/4")
Max. 470mm (18 1/2")
Min. 405mm (16")
The shaded area on the face of
the surround is the minimum flat
area required.
660 mm
265 mm Minimum
Fig. 4. Limiting Dimensions
Fig. 5. Limiting Dimensions Of
storage cylinder to BS:1566 part 1
should be used in most situations,
unless the appliance is to be fitted in
a soft water area in which case a
direct hot water cylinder may be used
provided that the boiler is glass lined.
All pipework in the primary circuit
must be 28mm diameter and the flow
pipe must rise continuously from the
boiler to the open vent.
If an indirect cylinder is used then
the primary circuit should be filled
with a suitable inhibitor to prevent
the build up of scale and corrosion.
FITTING THE
OPTIONAL ADD-IN
BOILER
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
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