Viessmann VITOROND 100 Service Instructions Manual page 13

Type vr2b, 40 to 100 kw oil/gas boiler

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Further details regarding the individual steps

A Turbulators (see page 17)

Checking the expansion vessel and system pressure

Commissioning, inspection, maintenance

Note

Please observe expansion vessel man-

ufacturer's instructions.

Carry out this test on a cold system.

1. Drain the system until the pressure

gauge indicates "0" or close the cap

valve on the expansion vessel and

reduce the pressure in the expansion

vessel.

2. If the pre-charge pressure of the

expansion vessel is lower than the

static system pressure, top up with

nitrogen until the pre-charge pres-

sure is 0.1 to 0.2 bar (10 to 20 kPa)

higher.

(cont.)

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