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

Checking the expansion vessel and system pressure

A
Fig. 12
Pressure gauge
A
Note
Please observe expansion vessel manufacturer's
instructions.
Carry out this test on a cold system.
1. Drain the system until the pressure gauge indi-
cates "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 pressure is 0.1 to
0.2 bar (10 to 20 kPa) higher.

Checking the thermal insulation for firm seating

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.
2. Check the mixer for tightness. Replace the O-rings
if the mixer leaks.

Adjusting the burner

Burner service instructions

Instructing the system user

The installer should instruct the user in the operation of
the system.
Commissioning, inspection, maintenance
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 expan-
sion vessel.
Permiss. operating pressure: 3 bar (0.3 MPa)
3. Click the motorised lever into place.
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