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Siemens Building Technologies
Fan coil controller for wall mounting ACR12
CE1N3573E
HVAC Products
17.08.2001
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.
Q1
Q2
Q3
0
10
50
80
100
0
10
50
80
100
35
73
D
06
Q
K
[%]
Q
H
[%]
W
H
W
K
X
p
X
p
X
dz
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.
W
H
W
K
X
p
X
p
X
dz
Q1
Q2
Q3
50
80
100
50
80
100
35
73
D
07
Q
K
[%]
Q
H
[%]
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
W
H
Heating setpoint
Q2
Fan speed 2
W
K
Cooling setpoint
Q3
Fan speed 3
X
p
P-band
Q
H
Heating load
X
dz
Neutral zone
Q
K
Cooling load
Settings on the device
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.
