hajdu HB200 Manuel De Mise En Service, D'opération Et D'entretien page 82

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It is forbidden to operate HB200(C) hot water tank outdoor or exposed to rain or
moisture.
If the HB200(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.
Rain
Figure 7.2.-6.
Air outlet
Figure 7.2.-7.
Air inlet
Filter