79
Checking the plate heat exchanger
3.
2.
D
A
B
C
4.
Fig. 42
A
Heating water flow
B
Heating water return
C
Cold water
D
DHW
1.
Shut off and drain the boiler on the heating water
and DHW sides.
2.
Undo the screws.
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.
Tighten screws as tightly as necessary and ensure
that the components are undamaged and are func-
tioning correctly throughout service life.
Observe torque settings if a torque wrench is avail-
able.
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.
Troubleshooting
Repairs
(cont.)
6179762
Diagnosis
