Viessmann Vitoradial 300-T VR3 Service Instructions For Contractors page 16

Commissioning, inspection, maintenance
Checking the heat exchanger gasket
Removing the heat exchanger cover
Fig. 8
1. Cut open the fabric lining on the cover at lower per-
foration (outer ring).
A
2. Remove cut-out fabric lining
3. Remove heat exchanger cover
4 hexagon screws.
16
.
D
by undoing the
C
(cont.)
4. Remove gasket and clean the sealing face.
B
Assembly
Assemble in reverse order.
Tighten cleaning cover to 5 Nm.