3
British Gas 440 - 480 RD2 -
Installation & Servicing
GENERAL
CAUTION. To avoid the possibility of injury during the installation, servicing or cleaning of
this appliance, care should be taken when handling edges of sheet steel components.
Boiler Size
440
450
460
470
480
Gas Supply Connection
in. BSP
Rc 1/2 (1/2)
Number of Boiler Sections
2
3
3
3
3
Flow and Return Connections
Rc 1 (1" BSP)
MAXIMUM Static Water Head
m (ft.)
30.5 (100)
(3 bar)
MINIMUM Static Water Head
m (ft.)
1.0 (3.3)
Electrical Supply
(Power Consumption)
230 V ~50 Hz (150 W)
Fuse Rating
External: 3 A
Internal: 2A to BS4265
Water Content
litre (gal.)
5.0 (1.1)
7.4 (1.6)
Dry Weight
kg. (lb.)
68 (150)
90 (198)
Boiler Size
Height
mm (in.)
850 (33.5)
Width
mm (in.)
440 (17.4)
Depth
mm (in.)
533 (21.0)
Gas Type
Natural 2 H
Gas Supply Pressure
20 mb
Flue duct diameter
mm (in.)
100 (4.0)
Flue duct length (max)
m (ft)
3 (9.8)
Table 1 - General Data
Table 2 - Performance Data
Boiler Size
440
450
460
470
480
Boiler Input
Nett CV
kW (Btu/h)
13.0 (44 300)
16.3 (55 600)
19.5 (66 500)
22.8 (77 800)
26.0 (88 700)
Gross CV
kW (Btu/h)
14.4 (49 100)
18.1 (61 700)
21.7 (74 000)
25.0 (85 300)
28.9 (98 600)
Gas Consumption
l/s (ft.
3
/h)
0.37 (47.3)
0.47 (59.4)
0.56 (71.3)
0.65 (83.1)
0.75 (95.0)
Boiler Output to Water
kW (Btu/h)
11.7 (40 000)
14.7 (50 000)
17.6 (60 000)
20.5 (70 000)
23.4 (80 000)
Burner Setting Pressure (hot)
mbar (in w.g.)
10.3 (4.4)
11.8 (4.7)
12.2 (4.9)
10.6 (4.3)
13.2 (5.3)
Seasonal Efficiency (SEDBUK)*
Band D
[78.2]%
[78.9]%
[79.0]%
[80.5]%
[79.8]%
Key to symbols
GB = United Kingdom (Countries of destination)
PMS = Maximum operating pressure of water
C
12
= A room sealed appliance designed for connection via ducts
to a horizontal terminal, which admits fresh air to the burner
and discharges the products of combustion to the outside
through orifices which, in this case, are concentric. The
fan is down stream of the combustion chamber.
I
2H
= An appliance designed for use on 2nd Family gas,
Group H only.
Note.
Gas consumption is calculated using a calorific value of 38.7
MJ/m
3
(1038 Btu/ft
3
) gross or 34.9 MJ/m
3
(935 Btu/ft
3
) nett. To
obtain the gas consumption at a different calorific value:-
a. For l/s - divide the gross heat input (kW) by the gross C.V.
of the gas (MJ/m
3
)
b. For ft
3
/h - divide the gross heat input (Btu/h) by the gross
C.V. of the gas (Btu/ft
3
)
c. The appliance is preset at the factory to the nominal rating.
*
The value is used in the UK Government's Standard Assessment Procedure (SAP) for energy rating of dwellings.
The test data from which it has been calculated have been certified by a notified body.
