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5.8 Damper management
In addition to air change in the room, the controller can also manage other functions connected to comfort enhancement
and system economy.
The functions the controller can handle vary according to the number of dampers fitted in the unit:
- units with 2 dampers, for air change only;
- units with 3 dampers, when free cooling / free heating is featured;
- units with 4 dampers, when a heat recovery system or a hot air generator is fitted in addition to free cooling / free
heating.
Dampers can be set either linearly or proportionally.
Units with two dampers
The dampers featured in 2-damper units include: a damper for fresh external air and a damper for recycled air.
Normally, their operation is complementary, i.e. the percentage opening of the external air damper is equal to the
percentage closing of the recycled air damper.
Units with three dampers
The dampers featured in 3-damper units include: a damper for fresh external air, a damper for exhaust air and a
damper for recycled air.
Normally, the external air damper opens at the same percentage as the exhaust air damper and the recycled air
damper is complementary to the other two. So, the percentage opening of the external air damper and the exhaust
air damper is equal to the percentage closing of the recycled air damper.
Units with four dampers
Units with four dampers feature the same dampers as 3-damper units plus one. The fourth damper is used for
external air.
It is used to cause the external air to flow through the heat recovery system, when heat recovery is enabled, and it is
closed in free cooling mode.
If the heat recovery system is not sized to provide for a 100% air flow in the unit, a fifth damper is actually fitted. This
is an extra exhaust damper that is used by the unit in free cooling mode to bypass the heat recovery system.
The parameters involved are shown in the table.
Parameter
Min
DA43
0.0
DA44
-20.0
DA45
0
DA52
0
DA54
0
We reserve the right to make changes without any prior notice.
UATYA
4P645203-1
Max
UM
Description
External air - Opening reduction for external air temperature -
50.0
°C
Summer temperature threshold
External air - Opening reduction for external air temperature - Winter
16.0
°C
temperature threshold
External air - Opening reduction for external air temperature - Min
100
%
opening
3
-
External air - Start up - Configuration
999
min
External air - Start up - Wash duration
Translation from original instructions
Packaged Rooftop
31
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