Checking The Mixer For Ease Of Operation And Leaks - Viessmann VITOCROSSAL CRU 800 kW Service Instructions Manual

Checking 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 apertures
Check that the vent is unobstructed and free from soil-
ing in the case of 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 system users their section for safekeeping.
■ Retain the heating contractor's section.
Commissioning, inspection, maintenance
(cont.)
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.
2. File all parts lists, operating and service instruc-
tions in the folder and hand this over to the system
user.
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