Viessmann Vitodens 100-W B1HA 26 Installation And Service Instructions Manual page 69

Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Boiler Connection
Legend
A Screws
B Plate-type heat exchanger
C Heating water return
D Heating water supply
E DCW
F DHW
(continued)
Replacing the flow limiter (B1KA only)
1. Drain or isolate the DHW system and shut off DCW.
2. Undo screws A.
3. Remove the cap B.
4. Remove faulty flow limiter C.
5. Insert new flow limiter C.
6. Fit new cap B provided.
Checking or replacing the plate type heat exchanger
(B1KA only)
1. Shut off or isolate and drain the boiler on the heating
water and the DHW side.
2. Pivot control unit downwards.
3. Remove two screws A from the plate-type heat
exchanger and remove the plate-type heat exchanger
B with gaskets.
Note: During removal, small amounts of water may
trickle out and escape from the removed plate-
type heat exchanger.
4. Check the DHW side for scaling and if required, clean
or replace the plate-type heat exchanger.
5. Check the heating water side for contamination
and if required, clean or replace the plate-type heat
exchanger.
6. Install in reverse order with new gaskets.
Note: Refer to the installation Instructions for
additional mounting options.
Troubleshooting
69