BA C7000 for EC Tower | EN | 01-2019 | 1000755
26
14 15 16 17 T/°C
T/°C
20.5
20
68 70 72 74 r.h/%
r.h/%
50
49
38 39 40 41 r.h/%
r.h/%
50.5
50
➋a
➍
➍
20 21 22 23 24 T/°C
T/°C
18.5
18
17.5
➋a
➋b
20 21 22 23 24 T/°C
T/°C
18.5
18
17.5
➋a ➋b
Values
Air/Control type (Part 2)
Room air control with supply air limit
The room control with supply air limit is con-
trolled via the T/H sensor in the return air intake
and via a second T/H sensor in the supply
air. Primarily it is controlled like the room air
control; only if the measured supply air tem-
perature is lower than the start temperature
➋a, the setpoint increased. The extent of the
setpoint increase is determined by a factor
which you enter as a gradient ➌. The graph
opposite clarifies the relationship that this fol-
lows. A steep gradient drastically corrects the
supply air temperature shortfall, but risks the
control circuit starting to oscillate.
With humidity control, the setpoint shifts in
the opposite direction. If the adjusted start
humidity ➍ is exceeded by the measured
supply air humidity, the setpoint lowers. You
can also enter a gradient factor ➎ for this. The
relationship is shown in the graph opposite.
new setpoint = old setpoint + gradient • (start
value - actual value)
Supply air control with room air limit
The supply air control with room air limit is
based on the same control principle as the
supply-air limited room air control. Yet in this
situation, the setpoint shifts in the opposite
direction because it works on the basis that the
supply air is colder than the return air.
If the room temperature exceeds start tem-
perature 1 ➋a the supply air temperature
setpoint is lowered.
When entering a second start value ➋b, the
supply air setpoint is increased if the room air
temperature falls due to a lower heat load. This
means that the cooling capacity is lowered and
energy is saved.
If the room humidity falls short of the entered
start humidity ➍, the supply air humidity set-
point is increased.
Actual value
Supply air sensor
Setpoint
Room air
Temperature
Humidity
Actual value
Supply air sensor
Setpoint
Room air
Example (temperature):
20.5 = 20 + 0.5 • (16 - 15)
Example (humidity):
49 = 50 + 0.5 • (70 - 72)
Example:
With T
room
> 2a: 17.5 = 18 + 0.5 • (23 - 24)
With T
room
< 2b: 18.5 = 18 + 0.5 • (22 - 21)
Humidity
Actual value
Room air sensor
Setpoint
Supply air
Example:
50.5 = 50 + 0.5 • (40 - 39)
Config
.../Temperature
.../Humidity
Actual value
Room air
sensor
Setpoint
Supply air
Temperature
Actual value
Room air sensor
Setpoint
Supply air
Temperature
2a: Start value 1
2b: Start value 2
Start value 1 > Start value 2
Start value 1< Start value 2
If start value 1 is lower than start value 2, it
is controlled according to start value 1 in the
range between both start values.
➋ a
➌
➍
➎
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