Checking The Expansion Vessel And System Pressure; Checking The Mixer For Ease Of Operation And Leaks - Viessmann VITOCROSSAL 200 CM2 Service Instructions For Contractors

Commissioning, inspection, maintenance

Checking the expansion vessel and system pressure

Note
Observe the expansion vessel manufacturer's instruc-
tions.
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 mixer for ease of operation and leaks

1. Remove the motorised lever from the mixer han-
dle.
2. Check the mixer for ease of operation.
Checking the thermal insulation for firm seating
Checking the ventilation air aperture in the installation room (only for
open flue operation)
Instructing the system user
The system installer should hand the operating instruc-
tions to the system user and instruct the user in oper-
ating the system.
Operating and service documents
1. Complete and detach the customer registration
card:
■ Hand the system user this part for safekeeping.
■ Retain the heating contractor's part.
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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.
Permissible operating pressure: 6 bar (0.6 MPa)
3. Check the mixer for tightness. Replace the O-rings
if the mixer leaks.
4. Click the motorised lever into place.
This includes all components installed as accessories,
e.g. remote control units. In addition, the system instal-
ler must make the user aware of the required mainte-
nance work.
2. File all parts lists, operating and service instruc-
tions in the folder and hand this over to the system
user.
The installation instructions are no longer required
after the installation and, therefore, do not need to
be retained.