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8. Filling
The system may be filled through a temporary hose
connection from a draw-off tap supplied from a servicing
pipe under mains pressure. Where the mains pressure
is excessive a pressure reducing valve shall be used to
facilitate filling.
The following fittings shall form a permanent part of the
system and shall be fitted in the order stated:
– A stop valve complying with the requirements of
BS. 1010, Part 2 (the hose from the draw-off tap
shall be connected to this fitting);
– A test cock;
– A double check valve of an approved type.
Sizing procedure for expansion vessel
The volume of the expansion vessel (litres) fitted to a
sealed system shall not be less than that given by
table 1, multiplied by a factor of 0.8 (for flow tempera-
tures of less than 80 °C).
Subject to modifications resulting from technical improvements!
Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006
Safety valve setting
Vessel charge and
initial system pressure
Total water content of
system (litres)
25
50
75
100
125
150
175
200
225
250
275
300
Multiplying factors for
other system volumes
Table 1 Expansion vessel volumes
Buderus • http://www.buderus-domestic.co.uk
3.0 bar
0.5
1.0
1.5
bar
bar
bar
Expansion vessel
volume litres
2.1
2.7
3.9
4.2
5.4
7.8
6.3
8.2
11.7
8.3
10.9
15.6
10.4
13.6
19.5
12.5
16.3
23.4
14.6
19.1
27.3
16.7
21.8
31.2
18.7
24.5
35.1
20.8
27.2
39.0
22.9
30.0
42.9
25.0
32.7
46.8
0.0833
0.109
0.156
11
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