Vaillant ecoMAX 646 Service Manual download pdf (Page 12)

12

Safety valve setting (bar) 3.0

Initial system pressure (bar) 1.0 1.5

Total water content of system VESSEL VOLUME (L)

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

0.109 0.156

the system volume by the factor

across

fig. 8

GW 402/1

3.7.5 Expansion vessel

An expansion vessel is incorporated

into the boiler 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 modernisation of old open

systems) an additional expansion

vessel can be installed external to the

boiler. It should be fitted in the return

pipe as close as possible to the boiler

in accordance with BS 5449: Part 1.

Guidance on the sizing of an

additional expansion vessel is given in

Table 2.

3.7.6 Circulating pump

The circulating pump is included in the

boiler. The pump head available for

the heating system is shown in fig. 8.

3.7.7 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.

3.7.8 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.

3.7.9 DHW expansion vessel

accessory

A DHW expansion vessel kit (Art. No.

8070) is available as an optional

accessory from Vaillant Ltd. This

expansion vessel kit should be fitted

to the boiler whenever either a stop

valve of the loose jumper type or a

non return valve are present in the

cold water mains supply to the boiler

(fig. 9).

Table 2: Sizing of Additional Expansion Vessel

fig. 9

GW 494/0

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 59 60

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