Viessmann B2HF - Removing the Hydraulic Unit

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3. Remove plate heat exchanger.
Note
During and after removal, small amounts of water
may trickle from the plate heat exchanger.
4. Remove gaskets and dispose of them.
5. Check connections on the DHW side for scaling.
Clean or replace the plate heat exchanger as
required.
6. Check connections on the heating water side for
contamination. Clean or replace the plate heat
exchanger as required.
7. Install plate heat exchanger in reverse order using
new gaskets.
Screw torque: 3.2 Nm
±
0.2
Note
During installation, ensure the connections are
positioned and the gaskets seated correctly.
Danger
Risk of electric shock from escaping heating
water or DHW.
Check all water side connections for tight-
ness.
Removing the hydraulic unit
In case hydraulic unit components have to be
replaced.
Danger
Risk of electric shock from escaping heating
water or DHW.
After installation, check all connections on the
water side for leaks.
Troubleshooting
Repairs (cont.)
5593201
Diagnosis