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1. Take the humidifier out of operation, as described in chapter 7.4.
2. Undo the brackets and open the right side panel(s).
3. Disconnect cables to combustion air blower, gas pressure regulating valve and pressure switch
(note assign ment of the connections).
4. Undo the coupling of the corresponding flexible gas pipe and disconnect the gas pipe.
5. Undo the two screws of the venturi manifold and lift up the manifold together with the gas pres
sure re gulat ing valve.
6. Undo the two screws of the electronic board (if present) and remove electronic board.
7. Undo the nuts on the outlet side of the blower and remove the blower unit.
Reinstallation is achieved by following the reverse sequence. Replace defective seals with new ones.
Make sure that all seals are inserted correctly and all cables are connected correctly.
Caution – Danger of explosion! Following maintenance work on the gas system, a leakage
test must always be undertaken in accordance with chapter 5.5.2
.
Removal and installation of the combustion air blower
Summary of Contents for GS 120 OC
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