Checking The Expansion Vessel And System Pressure; Checking The Mixer For Ease Of Operation And Leaks; Adjusting The Burner - Viessmann VITORONDENS 200-T Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Checking the expansion vessel and system pressure

A
A Pressure gauge
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.

Checking the mixer for ease of operation and leaks

1. Remove the motorised lever from the
mixer handle and check the mixer for
ease of operation.

Adjusting the burner

Burner service instructions
18
(cont.)
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.
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: 3 bar
(0.3 MPa)
2. Check the mixer for leaks. Replace
the O-ring gaskets if the mixer is leak-
ing.
3. Snap the motorised lever into place.