Performing Final Checks; Checking The Water Quality; Checking The Safety Valve Function; Expansion Vessel - Viessmann Vitocrossal 200 Series Service Instructions Manual

Performing final checks

1. Carry out final checks in accordance with the
points on pages 16 to 20.

Checking the water quality

Enter the amount of top-up water, the total hardness
and the pH value in the tables on page 55.
For water quality requirements, see page 53.

Checking the safety valve function

Expansion vessel

Note
Observe the manufacturer's instructions for the expan-
sion vessel.
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 expansion vessel pre-charge pressure is
lower than the static system pressure, top up with
nitrogen. 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 installation room ventilation air/extract air apertures

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.
Commissioning, inspection, maintenance
2. Record actual values in the report (on page 55).
3. Top up with water. The charge pressure of the
cooled system must be 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
3. Check the mixer for tightness. Replace the O-ring
seals 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.
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