Vaillant aquaPLUS VUI 362-7 Service Manual download pdf (Page 12)

4 General Requirements

4.9.6 Expansion vessel

The aquaPLUS incorporates 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

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 4.1.

4.9.7 Pump specifications

Fig. 4.5: Pump specifications

4.9.8 Circulating pump

The circulating pump is included in the boiler. The pump

head available for the boiler is shown in Fig. 4.5.

4.9.9 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.

4.9.10 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.

0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400

100

150

200

250

300

350

400

450

500

550

600

650

700

Volume flow [l/min]

Lift [mbar]

Pump switch in position III (pre-delivery setting)

Pump switch in position II

1500 1600 1700

Instructions for installation and servicing aquaPLUS VUI 362-712

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 0.109 0.156

those given above, multiply the

system volume by the factor across

Table 4.1: Sizing of additional expansion vessel

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