Viessmann Vitovalor 300-P Installation And Service Instructions For Contractors page 70

Commissioning, inspection, maintenance
Commissioning the fuel cell module
4. Check that the "Commissioning/maintenance"
operating mode is enabled. The MNT indicator
must be lit.
There is a fault if the display shows "n1", "n2" or
"n3". See the following table.
Commissioning faults
For further information on the fault display see
page 122.
Fault messages
Display under STATE
n1
n2
n3
Commissioning process
Since the complete commissioning process requires
some time, there are two different ways in which it can
be carried out:
■ In commissioning mode 1, the fuel cell is filled with
distilled water and then commissioned. Power gener-
ation is initiated after about 1 hour (see page 70).
Commissioning mode 1 terminates automatically if
power has been generated for 10 hours without inter-
ruption (MNT indicator extinguishes).
■ In commissioning mode 3, the fuel cell is filled with
distilled water but is not then commissioned. If com-
missioning is to be carried out in full later, select
commissioning mode 1. The filling process already
carried out will then be skipped (see page 71).
Note
To make use of the waiting times that arise during
commissioning of the fuel cell module, carry out addi-
tional commissioning steps during these periods.
These steps might include:
■ Tightness tests
■ Visual inspections
■ Adjustments to the control unit
■ Instructing the system user
During these additional steps, watch the filling process
on the display and continue with it.
Filling with distilled water and starting fuel cell module (commissioning mode 1)
1. Select "11" using / .
70
Cause
Heating water buffer cylinder is
fully charged.
Commissioning process started
too soon after switching on
Fuel cell module is in cooling
mode.
Fuel cell fault
(cont.)
Remedy
Use consumers to draw off heat until the "n1"
message disappears.
Re-start the commissioning process after about
5 min.
Wait until cooling mode has terminated and the
"n2" message disappears. This process takes
about 90 min.
Inform Viessmann Technical Services.
Note
Stopping commissioning (in emergency only). See
page 72
■ Commissioning mode 3 can be stopped during pha-
ses 01 to 04.
Commissioning mode 1 can be stopped during pha-
■
ses 01 to 05. During phases 06 to 12, the commis-
sioning process cannot be stopped.