162
CHECKING AND CLEANING THE PRESSURE EQUALISATION HOSE
1. Set the control to the operating mode OFF.
✓ The OFF symbol lights up.
2. Allow the fire in the heating system to burn out and cool down.
3. Turn the main switch off.
4. Use a pipe wrench to release the DN 40 union nuts on the feed
system connection nozzle (2) and on the boiler connection nozzle
(1).
5. Detach the pressure equalisation hose (3).
6. Inspect the pressure equalisation hose (3) for dirt and dislodge it if
necessary by forceful shaking and careful bending.
7. Mount the pressure equalisation hose in the reverse sequence.
✓ The inspection and cleaning of the pressure equalisation hose is
completed.
The pressure equalisation hose is only available with the HDG Com-
pact 45/50/65/80 boiler.
Important!
✎ See “Generally applicable safety instructions” in this section.
Figure 7/19 - Checking and cleaning the pressure equalisation hose
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