4.1 he appliance is not suitable for external installation unless
a suitable enclosure is provided.
4.2 he appliance should be positioned on a non-combustible
solid base as near to the flue location point as possible. Care
should be taken to ensure that the appliance is level; use
packing at the corners where necessary.
4.3 When fitting a LLD or RS model, the rear of the appliance
must be positioned against an external wall such that the flue
terminal can safely discharge the flue gases as described in
Section 7.
4.4 he following clearances must be left to allow access for
installation and servicing:
(a) Above 300mm
(b) In front - 600mm
(c) Right and left hand side – sufficient for panel
removal and access to pipe connections where
required.
See Figs. 2 and 3.
For installation and servicing of the appliance the cabinet should
be removed as follows:
5.1 Remove the cabinet top panel by lifting squarely upwards to
release the four ball stud connections.
5.2 Remove the front panel by pulling the bottom of the panel
forwards to release the ball studs and lifting the panel upwards
and forwards to release from its supporting ledge.
5.3 he side panels are removed by firstly following procedures
5.1 to 5.2 as described above, then remove screw (A) from the
side panel base and the three screws located in the upper flange
of each side panel. Ease the panel clear of the electrical control
box and slide forwards to release from the locating lugs on the
base plate.
5.4 he control box can be removed by undoing the four screws
in the top access cover and then removing the wing nut on the
underside of the control box. he thermostat phials should be
carefully removed from the phial pocket and the control box
placed in a safe place taking care not to kink the thermostat
capillary tubes.
5.5 On the RS balanced flue model, remove the burner box
cover by pulling forwards to release the ball studs. his will be
found easier by pulling on one side of the handle first to release
two of the ball studs and then repeating on the other side. ake
care not to pivot the remaining two ball studs too far around as
this will cause damage to the spring clips.
OPEN FLUE MODEL ( CF/LLD )
his includes conventional flue and standard low level and high
level horizontal discharge kits.
.1 In order to ensure clean and efficient combustion an
adequate supply of air must be delivered to the combustion
chamber. o provide sufficient air a suitable inlet should be
provided into the room or space in which the boiler is situated,
the sizes of which are given in able 10. An air brick or other
form of continuous air supply may have to be built into the
installation in order to ensure an adequate supply of air.
.2 If the appliance is to be installed in a confined space or com-
partment two air vents are required, one at high level and one at
low level. he minimum free area of each vent is given in able
11 and depends whether the air is taken from another room or
from outside the building. Where the air is taken from another
room that room must contain an air inlet as described in 6.1.
.3 here must be sufficient clearance around the appliance to
allow proper circulation of ventilation air. he clearances
required for installation and servicing will normally be adequate
for ventilation. See Section 4.4.
ROOM SEALED BALANCED FLUE MODEL ( RS )
.4 he appliance does not require a separate vent for
combustion air.
.5 Installation in cupboards or compartments require
permanent vents for cooling purposes, one at high level and one
at low level, either direct to outside air or to a room. Both vents
must pass to the same room or be on the same wall to the
outside air. he minimum air vent free area is given in able 12.
. here must be sufficient clearance around the appliance to
allow proper circulation of ventilation air. he clearances
required for Installation and Servicing will normally be adequate
for ventilation. See Section 4.4.
6. Air Supply
5. Removal of the Cabinet
4. Siting the Appliance
Table 11. Minimum Air Vent Free Area for Open Flue
appliances installed in a compartment.
Appliance Ventilation to room or Ventilation to outside
model internal space
High Level Low Level High Level Low Level
12/14 154cm2231cm277cm2154cm2
15/19 209cm2314cm2105cm2209cm2
20/25 275cm2413cm2138cm2275cm2
26/32 352cm2528cm2176cm2352cm2
32/50 550cm2825cm2275cm2550cm2
50/70 770cm21155cm2385cm2770cm2
Table 12. Minimum Air Vent Free Area for Room Sealed
appliances installed in a compartment.
Appliance Ventilation to room or Ventilation to outside
model internal space
High Level Low Level High Level Low Level
12/14 154cm2154cm277cm277cm2
15/19 209cm2209cm2105cm2105cm2
20/25 275cm2275cm2138cm2138cm2
26/32 352cm2352cm2176cm2176cm2
APPLIANCE AREA OF AIR INLET
cm2in.2
12/14 77 12
15/19 105 16.5
20/25 138 21.5
26/32 176 27.5
32/50 275 43
50/70 385 60
Table 10. Minimum Combustion Air Inlet Free Area for
Open Flue appliances
