Yearly Maintenance Of Fuel Cell Module - Viessmann Vitovalor PT2 E11T Installation And Service Instructions Manual

5-yearly maintenance of fuel cell module

Note
Before carrying out the maintenance work:
■ The fuel cell module must be in maintenance mode.
Start maintenance mode, see page 64.
■ The distilled water must have been drained.
Draining the distilled water
Note
This is required for the following maintenance work.
The fuel cell module must be in maintenance mode.
To save time, the system user can activate mainte-
nance mode in advance.
It takes about 15 min to drain the distilled water
(approx. 4.5 l).
B
A
Fig. 67
01. Remove programming unit cover
02. Close the gas shut-off valve.
C
. 03. Check that the fuel cell module is in maintenance
A
mode: "MNT" indicator should be illuminated.
If not: Select maintenance mode (see page 64).
Note
The cooling process on the fuel cell module lasts
approximately 90 min. The cooling process is
complete, when "P0" appears under ITEM 30 in
STATE.
Only then should maintenance work on the fuel
cell module be started.
!
04. Use / to select "22".
Commissioning, inspection, maintenance
Please note
If this waiting time is not observed,
there is a risk of scalding and damage to
the appliance.
75