15
British Gas 440 - 480 RD2 -
Installation & Servicing
INSTALLATION
FLUE OUTLET
12 PREPARING THE BOILER
Notes.
!
Before placing the boiler in the selected position any gas
and water connections at the rear of the boiler should be
prepared, due to the possible lack of access.
!
The pump may be fitted to the FLOW or the RETURN.
1. Screw the distributor tube (supplied with a 1" BSP x
28mm copper adaptor) into the selected heating return
tapping, using an appropriate jointing material.
IMPORTANT.
It is IMPERATIVE that the index mark on the distributor
tube bush is in alignment with the mark on the section
boss, as shown in Frame 7.
DO NOT disturb it when connecting subsequent pipework.
Fully pumped systems using more than 1 pump, serving
separate zones, must have a common return connection to
the distributor tube.
2. Select the desired pumped flow tapping and fit a 28mm
x 1" BSP adapter.
3. Fit the boiler return sensor pocket into the appropriate
front section tapping as follows:
a. Screws the hexagon bush into the tapping using
approved jointing material. Refer to Tables 6 and 7.
b. Fit the 'O' ring into the bush.
c. Insert the sensor pocket, ensuring that it enters the
hole in the end of the distributor tube.
d. Secure the pocket with the 3 screws and washers
provided.
4. Screw the supplied overheat thermostat sensor pocket
into the appropriate front section tapping using
approved jointing material. Refer to Tables 6 and 7.
5. Screw the supplied boiler flow sensor pocket into the
appropriate front section tapping, using an approved
jointing material. Refer to Tables 6 and 7.
6. Fit 28mm x 1" BSP adapter pipe fittings to the
appropriate rear tappings for DHW if required and plug
any unused tappings.
Connections
Sensor Position
(as viewed at front)
Back Section
Front Section
CH
DHW
Flow
Return
O/heat
Flow
Return Flow
Return
Top
Bottom Bottom
LH
LH
RH
RH
LH
LH
RH
LH
RH
RH
LH
LH
RH
LH
RH
RH
LH
LH
RH
RH
LH
RH
LH
LH
RH
RH
LH
RH
Table 7 - Gravity Dom. Hot Water & Pumped Central Heating
Table 6 - Fully Pumped Systems
Connections
Sensor Position
(as viewed at front)
Back Section
Front Section
Flow
Return
Flow
Return
O/heat
Top
Bottom
Top
Bottom
Bottom
LH
LH
LH
LH
RH
LH
RH
LH
RH
LH
RH
RH
RH
RH
LH
RH
LH
RH
LH
RH
13 REAR FLUE ASSEMBLY - Exploded view
5 6
7
8
1
2
3 4
Mex
1842
LEGEND
1. Terminal.
2. Weather seal.
3. Flue assembly.
4. Boiler sealing ring.
5. Flue extension tube.
6. Sealing plate.
7. Flue connector.
8. Turret access cover.
For wall thickness 114mm to 600mm
1. Remove the turret access cover.
2. Locate the LONG flue extension tube (with the
air deflector ring) in the flue accessories pack.
3. 440 models only. Undo the 2 self-tapping
screws securing this ring and slide to the
centre of the flue tube.
Note.
The boiler turret assembly is factory built, ready for rear flue installation.
4. Offer the extension tube down through the access hole and partly out
through the rear turret hole.
5. 440 models only. Relocate the air deflector ring - it will only fit one way,
due to the offset tabs - and secure its rear tab in the
rear hole with a
self-tapping screw (inserting this from the
outside of the turret).
6. Pull the flue extension tube foward to the flue connector and secure to
the fan outlet assembly with the M4 screw.
7. 440 models only. Refit the
front self-tapping screw to
the second fixing tab on the
air ring.
FLUE OUTLET