Viessmann Vitovalor PT2 E11T Installation And Service Instructions Manual page 129

Repairs
(cont.)
Draining the fuel cell module system separation circuit
Fig. 79
1. Place the fuel cell module in maintenance mode.
See page 64.
A
B
2. Turn off the ON/OFF switch on the fuel cell mod-
ule. See page 58.
3. Attach the supplied short hose to fitting
connect it to a drain.
4. Open the drain valve on the underside of fitting
by turning screw to undo it and pulling it down-
B
wards.
Note
If necessary, open the air vent valves on the two
inner shut-off valves above the modules.
Draining the system on the DHW side
Fig. 80
1. Shut off the cold water connection.
2. To vent, open a draw-off point in the domestic sys-
tem.
3. Attach a hose to connection
drain.
4. Open drain valve .
B
Troubleshooting
and
A
A
B
A
and connect to a
A
129