Hoval RoofVent CON-9, Design Handbook

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2.3 Operating modes
The RoofVent
®
twin heat has the following operating modes:
■ Off
■ Ventilation
■ Recirculation
■ Recirculation night
■ Exhaust air
■ Supply air
■ Night cooling summer
■ Emergency operation
The DigiNet control system controls these operating modes
automatically per control zone, in accordance with the sched-
uler (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 Use Diagram Description
OFF Off
The fans are turned off. Frost protec-
tion remains active. There is no room
temperature control.
if the unit is not
needed
Supply air fan ................... Off
Exhaust air fan ................. Off
Energy recovery ............... 0 %
Fresh air damper .............. Closed
Recirculation damper ....... Open
Heating ............................ Off
VE2 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 %
Defrosting
When outside temperatures are very low,
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.
to defrost the plate
heat exchanger
Supply air fan ................... Off
Exhaust air fan ................. On (50 %)
Energy recovery ............... 100 %
Fresh air damper .............. Closed
Recirculation damper ....... Open
Heating ............................ 100 %
REC 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.
for preheating Supply air fan ................... On
*)
Exhaust air fan ................. Off
Energy recovery ............... 0 %
Fresh air damper .............. Closed
Recirculation damper ....... Open
Heating ............................ On
*)
*) during heat demand
RECN Recirculation night
like REC, but with room temperature set
value night
during the night and
on weekends
RoofVent
®
twin heat
Construction and operation