Viessmann VITODENS 100-W Installation And Service Instructions Manual page 49

Repairs
(cont.)
Checking or replacing the plate heat exchanger
D
E Heating water flow
F Heating water return
1. Shut off and drain the boiler on the
heating water and the DHW side.
2. Flip down control unit.
3. Push servomotor A slightly
upwards.
4. Turn adaptor B with servomotor A
1/8 of a turn anticlockwise and
remove.
D
E
H
C
G Cold water
H DHW
5. Remove two screws C from the
plate heat exchanger and remove
plate heat exchanger D with gas-
kets.
Note
During removal, small amounts of
water may trickle out and escape
from the plate heat exchanger.
Troubleshooting
F
G
A
B
49