Technical data

ManualsBrandsVaillant ManualsHeating SystemecoMAX 613/2 E

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

0 200 400 600 800 1000 1200 1600

Lift

[

mbar

]

1800

Volumeflow

[

l/h

]

1900

1400

100 %

53 %

60 %

70 %

85 %

400

300

200

100