15
General requirements 3
Instructions for installation and servicing ecoMAX
15
3.11.4 Pressure gauge
This is factory fitted to the boiler and indicates the pri-
mary circuit pressure to facilitate filling and testing.
3.11.5 Expansion vessel
ecoMAX boilers incorporate a 10 litre expansion vessel
which is suitable for a sealed heating system with a
maximum water content of 100 litres.
If the nominal capacity of the built in expansion vessel is
not sufficient for the heating system (for instance in
case of modernization of old open systems) an additio-
nal expansion vessel can be installed external to the boi-
ler. It should be fitted in the return pipe as close as pos-
sible to the boiler in accordance with BS 5449: Part 1.
Guidance on the sizing of an additional expansion vessel
is given in Table 3.4.
Vessel
Volume [L]
Initial system pressure (bar)
1.0
1.5
Pressure relief valve setting (bar)
3.0
Total water content of system litres
25
2.7
3.9
50
5.4
7.8
100
10.9
15.6
125
13.6
19.5
150
16.3
23.4
175
19.1
27.3
200
21.8
31.2
225
24.5
35.1
250
27.2
39.0
275
30.0
42.9
300
32.7
46.8
325
35.7
50.7
350
38.1
54.6
375
40.9
58.5
400
43.6
62.4
425
46.3
66.3
450
49.0
70.2
475
51.8
74.1
500
54.5
78.0
For system volumes other than those
given above, multiply the
system volume by the factor across
0.109
0.156
Table 3.4 Sizing of additional expansion vessel
3.12 Pump specifications
3.12.1 Circulating pump
The circulating pump is included in the boiler. The pump
head available for the heating system is shown in fig. 3.9.
Circulating pump (ecoMAX 635 and 835 only):
The ecoMAX 635 and 835 boilers are fitted with a modu-
lating circulating pump. The pump head available for the
heating system is shown in figure 3.10.
Fig. 3.9 Pump specifications ecoMAX 613/2, 618/2, 622/2,
824/2, 828/2
Fig. 3.10 Pump specifications ecoMAX 635, 835
3.12.2 System by–pass
An automatic system by–pass is included within the boi-
ler. The boiler is suitable for use in systems with ther-
mostatic radiator valves and no additional by–pass is
required.
3.12.3 Venting
The boiler is fitted with an automatic air vent. Additional
provision should be made to enable the heating system
to be vented during filling and commissioning either by
automatic air vents or manually.
3.13 Condensate trap
The boiler is fitted with a condensate trap incorporating
a water trap of 75 mm.
400
300
200
100
0
0
200
400
600
800
1000
1200
1600
Lift
[ mbar
]
1800
Volumeflow [l/h]
1900
1400
100 %
53 %
60 %
70 %
85 %
400
300
200
100
0
0
200
400
600
800
1000
1200
1600
Lift
[ mbar
]
Volumeflow [l/h]
1800
1400
Position III
Position II
83 41 77_12 GB04.04.qxd 22.09.2004 12:34 Uhr Seite 15
