Download Vaillant 628/2 E Technical data

4 General Requirements
Vessel Volume [L]
1.0
1.5
3.0
700
Lift [mbar]
Initial system pressure (bar)
Pressure relief valve setting (bar)
Total water content of system ltres
25
2.7
3.9
50
5.4
7.8
100
10.9
15.6
125
13.6
19.5
650
600
550
500
450
400
350
300
150
16.3
23.4
175
19.1
27.3
200
21.8
31.2
Pump switch in position III (pre-delivery setting)
250
200
150
Pump switch in position II
100
50
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
For system volumes other than those given
above, multiply the system volume by the
factor across
54.5
78.0
0.109
0.156
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
Volume flow [l/min]
Fig. 4.6: Pump specifications 37 kW
4.8.7 System by-pass
An automatic system by-pass is included within the
boiler. The boiler is suitable for use in systems with
thermostatic radiator valves and no additional by-pass is
required.
4.8.8 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.
4.8.6 Circulating pump
The circulating pump is included in the boiler. The pump
head available for the heating system is shown in
fig. 4.6.
Lift [mbar]
700
650
600
550
500
450
400
350
300
Pump switch in position III (Factory setting)
250
200
150
Pump switch in position II
100
50
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
Volume flow [l/hr]
Fig. 4.6: Pump specifications 12-28 kW
14
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