SIZING OF ADDITIONAL EXPANSION VESSELS: TABLE 3
Deduct from the value given in the table the 7 litre vessel supplied.
Safety
valve setting (bar)
3.0
Vessel charge
pressure (bar)
0.5
1.0
1.5
Initial system
pressure (bar)
0.5
1.0
1.5
2.0
1.0
1.5
2.0
1.5
2.0
Total water
content Of system
EXPANSION VESSEL VOLUME (LITRES)
Litres
25
2.1
3.5
6.5
13.7
2.7
4.7
10.3
3.9
8.3
50
4.2
7.0
I2.9
27.5
5.4
9.5
20.6
7.8
16.5
75
6.3
10.5
19.4
41.3
8.2
14.2
30.9
11.7
24.8
100
6.3
14.0
25.9
55.1
10.9
19.0
41.2
15.6
33.1
125
10.4
17.5
32.4
68.9
13.6
23.7
51.5
19.5
41.3
150
12.5
21.0
38.8
82.6
16.3
28.5
61.8
23.4
49.6
175
14.6
24.5
45.3
96.4
19.1
33.2
72.1
27.3
57.9
200
16.7
28.0
51.8
110.2
21.8
38.0
82.4
31.2
66.2
225
18.7
31.5
58.3
124.0
24.5
42.7
92.7
35.1
74.5
250
20.8
35.0
64.7
137.7
27.2
47.5
103.0
39.0
82.7
275
22.9
38.5
71.2
151.5
30.0
52.2
113.3
42.9
91.0
300
25.0
42.0
77.7
165.3
32.7
57.0
123.6
46.8
99.3
325
27.0
45.5
84.1
179.1
35.7
61.7
133.9
50.7
107.6
350
29.1
49.0
90.6
192.8
38.1
66.5
144.2
54.6
115.8
375
31.2
52.5
97.1
206.6
40.9
71.2
154.5
58.5
124.1
400
33.3
56.0
103.6
220.4
43.6
76.0
164.8
62.4
132.4
425
35.4
59.5
110.1
239.2
46.3
80.7
175.1
66.3
140.7
450
37.5
63.0
116.5
247.9
49.0
85.5
185.4
70.2
148.9
475
39.6
66.5
123.0
261.7
51.8
90.2
195.7
74.1
157.2
500
41.6
70.1
125.9
275.5
54.5
95.0
206.0
78.0
165.5
For system volumes
other than those given
above, multiply the
0.0833
0.140
0.259
0.551
0.109
0.190
0.412
0.156
0.331
system volume by
the factor across
Note: This pressure can be increased up to 1.5 bar to suit high static head situations, see item 10, other appliance components in the
SERVICING INSTRUCTIONS.
B) Where fitting a make up vessel would be
difficult re pressurisation of the system can
be done. See section on FILLING.
If the capacity of the central heating system
should exceed 110 litres,
an additional
vessel may be installed if required on
the return to the combination boiler from
the heating system (Fig. 7). Guidance on
vessel sizing is given in (Table 3).
Reference should be made to British Gas
old system with a recommended descal-
ing agent.
Also check pipework and renew any corrod-
ed pipework or fittings. Valve glands must
be repacked or replaced wherever neces-
sary and any defective controls exchanged.
4.8.10
Hard water areas
If the area of installation is recognized as a
hard water, it is recommended that a suitable
Publications <<Material and Installation
water treatment device is installed in the
Specifications for Domestic Central Heating
mains.
and Hot Water>>. Draining taps should be at
least 1/2” in BSP nominal size and be in
The water hardness can be determined by
accordance with BS 2879.
using the standard test paper or by refer-
ring to local water authority.
4.8.9
Installation to an existing central heating
4.9
DOMESTIC WATER
system
The combination boiler is designed to oper-
4.9.1
The domestic hot water must be in accor-
ate on a sealed system only. Therefore if
dance with the relevant recommendations
the existing system is of the open water
type it will have to be modified to comply
of BS 5546. Copper tubing to BS 2871. 1 is
with BS 5376 Part 2.
recommended for water carrying pipework
Before installing a new combination
and MUST be used for pipework carrying
boiler to an existing system flush out the
potable water.
13
Summary of Contents for RSF 82E
Page 39: ...Fig 93 Fig 91...
Page 42: ...SECTION 9 ELECTRICAL SYSTEM DIAGRAM Fig 94...
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Page 46: ...SECTlON IO EXPLODED PARTS DIAGRAM...
Page 49: ...NOTES...
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