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Settings on the device
Siemens Building Technologies
HVAC Products
With 10 % control of the heating or cooling valve, the fan switches to speed I, with 80 %
to speed II and with 100 % to speed III. The switching hystereses of the fan speeds are
shown in the following diagram.
100
80
50
Q
[%]
H
X
p
Ventilation in the neutral zone OFF. Mode 1, i.e. S8 = on
When an energy requirement of 10 % is reached, the fan switches to speed 1
(S8 = on), if the position "Auto" automatic operation is selected.
During dead zone is a periodical fan operation active, which is starting the fan every 30
min. for 1 min.
100
80
50
Q
[%]
H
X
p
Ventilation in the neutral zone ON. Mode 2, i.e. S8 = off
The user can select a fan speed dwell time of 1 or 2 minutes. This applies for automatic
operation and can be set with switch S4.
Q1
Fan speed 1
Q2
Fan speed 2
Q3
Fan speed 3
Q
Heating load
H
Q
Cooling load
K
Various settings can be made on the printed circuit board of the device using a 12 way
DIP switch (see the following diagram). For changes to take effect, the device must be
disconnected from the power supply.
Fan coil controller for wall mounting ACR12
Q3
Q2
Q1
10
0
0
10
W
W
X
H
K
dz
Q3
Q2
Q1
W
W
H
K
X
dz
W
H
W
K
X
p
X
dz
50
80
100
X
p
50
80
100
X
p
Heating setpoint
Cooling setpoint
P-band
Neutral zone
CE1N3573E
17.08.2001
Q
[%]
K
Q
[%]
K
5/10
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