Hoval RoofVent CON-9, Design Handbook

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2.3 Operating modes
The RoofVent
®
twin cool 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 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 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/cooling ................ Off
VE2 Ventilation
The RoofVent
®
unit blows fresh air into
the room and draws off spent room air.
Heating/cooling 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/cooling ................ 0 - 100 %
Defrosting
When fresh air 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: During heat or cool
demand, the RoofVent
®
unit draws in
room air, heats or cools it and blows it
back into the room.
The room temperature set value day is
active.
for preheating or
precooling
Supply air fan ................... On
*)
Exhaust air fan ................. Off
Energy recovery ............... 0 %
Fresh air damper .............. Closed
Recirculation damper ....... Open
Heating/cooling ................ On
*)
*) during heat or cool demand
RECN Recirculation night
like REC, but with room temperature set
value night
during the night and
on weekends
RoofVent
®
twin cool
Construction and operation