Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors page 139

Repairs
(cont.)
Draining the system separation circuit on the fuel cell module
A
Fig. 88
1. If not yet set: Set maintenance mode. Wait until the
fuel cell module is shut down. The cooling process
is completed when the following display appears
on the programming unit of the fuel cell module:
30 P0
ITEM STATE
Note
The cooling process on the fuel cell module lasts
up to 90 min.
!
Please note
If this waiting time is not observed,
there is a risk of scalding and damage to the
appliance.
Draining the system on the DHW side
Fig. 89
2. Place a sufficiently large, flat container under the
3. Unscrew filter from drain opening
1. Shut off the cold water connection.
2. To vent, open a draw-off point in the domestic sys-
3. Attach a hose to connection
B
4. Open drain valve
A
drain opening A .
quate ventilation in the system separation circuit.
tem.
drain.
.
B
Troubleshooting
. Ensure ade-
A
and connect to a
A
139