Checking The Plate Heat Exchanger - Viessmann VITODENS 222-F Installation And Service Instructions Manual

Troubleshooting
Repairs
(cont.)

Checking the plate heat exchanger

Fig. 51
1. Drain the boiler:
On the heating water side, see page 90
■
On the DHW side, see page 46
■
2. Move programming unit to maintenance position
(see page 27).
3. Undo the fixing screws.
4. Detach the plate heat exchanger and remove
towards the front.
94
8. 3.
4.
5. Check the connections on the heating water and
6. Install in reverse order using new gaskets.
DHW sides for contamination and scaling; replace
the plate heat exchanger if necessary.
Torque for fixing screws 3.2 Nm