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4. Siting the Appliance
4.1 The appliance is not suitable for external installation unless
a suitable enclosure is provided.
4.2 The 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 an RS model, the appliance must be positioned
near an external wall such that the flue terminal can safely dis-
charge the flue gases as described in Section 7.
4.4 The following clearances must be left to allow access for
installation and servicing:
a) In front — 600mm
b) Above, sufficient clearance to allow the control box to be
positioned (see Section 5.4) in the service position.
c) Left and right hand side — sufficient for panel removal and
access to pipe connections where required.
5. Removal of the Cabinet
For installation 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 Unplug the burner lead from the control box.
5.4 Remove the control box retaining screws, as shown in the
figure below. Slide the control box up into the service position
(see figure below) allowing the locating lugs to locate on the
slide rail.
Slide control box forwards on slide rails
Control box
retaining screws
Slide rail
locating lugs
5.5 Remove the burner by releasing the burner locking screws as
shown above. Lift the burner clear of the heat exchanger and place
the burner on the floor.
5.6 Release the split pin from the thermostat pocket and carefully
remove the thermostat phials from the thermostat pocket (as
shown in Fig 2.
5.7 Remove the eight side panel screws labelled (A) and (B) in Fig. 2.
Slide the cabinet assembly and control box assembly forwards to
release the cabinet side panels from the base plate locating lugs.
5.8 Carefully store the cabinet assembly and control box assembly.
5.9 Install the cabinet assembly and control box assembly by
following 5.1 to 5.7, in reverse order.
NOTE: The side panels should be slid along the inside of the base
plate using the leading edge on the base of the side panels, as
shown in Fig. 2.
OPEN FLUE MODEL ( CF )
6.1 In order to ensure clean and efficient combustion an
adequate supply of air must be delivered to the combustion
chamber. To 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 Table 4. 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.
6.2 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. The minimum free area of each vent is given in Table 5
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.
6.3 There must be sufficient clearance around the appliance to
allow proper circulation of ventilation air. The clearances
required for installation and servicing will normally be adequate
for ventilation. See Section 4.4.
ROOM SEALED BALANCED FLUE MODEL ( RS )
6.4 The appliance does not require a separate vent for
combustion air.
6.5 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. The minimum air vent free area is given in Table 6.
Table 4. Minimum Combustion Air Inlet Free Area for
Open Flue appliances
APPLIANCE
12/18
18/25
Table 5. Minimum Air Vent Free Area for Open Flue
appliances installed in a compartment.
Appliance
model
12/18
18/25
Burner locking
Table 6. Minimum Air Vent Free Area for Room Sealed
screws
appliances installed in a compartment.
Appliance
model
12/18
18/25
5
6. Air Supply
AREA OF AIR INLET
cm
2
99
138
Ventilation to room or
Ventilation to outside
internal space
High Level
Low Level
High Level Low Level
2
2
198cm
297cm
275cm
2
413cm
2
Ventilation to room or
Ventilation to outside
internal space
High Level
Low Level
High Level Low Level
198cm
2
198cm
2
2
2
275cm
275cm
in.
2
15.3
21.5
2
2
99cm
198cm
138cm
2
275cm
2
99cm
2
99cm
2
2
2
138cm
138cm
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