RoofVent Design Handbook LHW, LKW 2017 by Hoval USA

More catalogs by Hoval USA | RoofVent Design Handbook LHW, LKW 2017 | 280 pages | 2017-03-16

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Page 71 of RoofVent Design Handbook LHW, LKW 2017

roofvent® twin heat construction and operation 2.3  operating modes the roofvent® twin heat has the following operating modes ■■ off ■■ exhaust air ■■ ventilation ■■ supply air ■■ recirculation ■■ night cooling summer ■■ recirculation night ■■ emergency operation the diginet control system controls these operating modes automatically per control zone in accordance with the scheduler exception emergency operation in addition you can ■■ manually switch the operating mode of a control zone ■■ switch each individual roofvent® unit to operating mode off recirculation exhaust air supply air or emergency operation code 1 operating mode off use if the unit is not off the fans are turned off frost protection needed remains active there is no room temperature control d diagram description e supply air fan off exhaust air fan off energy recovery 0 fresh air damper closed recirculation damper open heating off f g ve2 rec ventilation the roofvent® unit blows fresh air into the room and draws off spent room air heating and energy recovery are controlled depending on the heat demand and temperature conditions the room temperature set value day is active during room use supply air fan on exhaust air fan on energy recovery 0 - 100 fresh air damper open recirculation damper closed heating 0 - 100 i defrosting to defrost the plate when outside temperatures are very low heat exchanger condensate in the extract air may freeze if the pressure drop in the plate heat exchanger is too high the roofvent® unit switches automatically to defrosting mode supply air fan off exhaust air fan on 50 energy recovery 100 fresh air damper closed recirculation damper open heating 100 recirculation on/off operation in the event of heat demand the roofvent® unit draws in room air warms it and blows it back into the room the room temperature set value day is active supply air fan on exhaust air fan off energy recovery 0 fresh air damper closed recirculation damper open heating on recn recirculation night like rec but with room temperature set value night h for preheating during the night and on weekends jklm during heat demand n 69