Checking The Expansion Vessel And System Pressure; Checking The Water Quality - Viessmann VITOROND 200 Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Checking the expansion vessel and system pressure

Note
Observe instructions of the expansion
vessel manufacturer.
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.
The static pressure corresponds to
the static head.

Checking the water quality

Observe the instructions in chapter
"Water quality requirements".
14
3. Top up with water until the charge
pressure of the cooled system is 0.1
to 0.2 bar (10 to 20 kPa) higher than
the pre-charge pressure of the
expansion vessel.
Permiss. operating pressure: 6 bar
(0.6 MPa)
(cont.)