hajdu HB300 Manuel De Mise En Service, D'opération Et D'entretien page 83

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Putting into operation HB300(C) hot water tank in a closed space.
It is forbidden to operate HB300(C) hot water tank outdoor or exposed to rain or
moisture.
If the HB300(C) hot water tank is connected to air duct reaching to outdoor, reliable
water-resistant protection needs to be ensured for the air duct, to avoid that rainwater
enters the appliance.
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Figure 7.2.-5.
Figure 7.2.-6.
Air outlet
Rain
Weather shed
Air inlet
Filter