Siemens ACR12.3 1, ACR12.3 0 Series, ACR12.320/ALG, ACR12.321/ALG, ACR12.340/ALG Series Manual
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ACR12.320/ALG ACR12.321/ALG
ACR12.340/ALG ACR12.341/ALG
573
3
Use
Fan coil controller
for wall mounting
Pulse width modulated (PWM) valve outputs for thermic actuators, AC 230 V
P or PI control behaviour selectable
3-speed fan control, automatic and manual
Manual switching between heating and cooling operation, or automatic with
changeover (C/O) sensor QAH11
Potential-free input for window contact or occupancy detector
Inbuilt room temperature sensor
Three operating modes: Comfort / Economy / Standby
The status of the operating mode switch
/ ) are memorised on power failure.
(
For controlling the room temperature in individual rooms and zones which are heated
and cooled by fan coils. The controllers are suitable for 2- or 4-pipe applications with
manual and automatic fan control.
For control of
• a 3-speed fan
• two valve actuator with ACR12.34x/ALG for 4-pipe applications
• a valve with an electric heater up to 2850 VA with ACR12.32x/ALG
for 2-pipe applications
( èèèè ) and changeover switch
ACR12.3x0
ACR12.3x1
CE1N3573E
17.08.2001
Siemens Building Technologies
HVAC Products
Functions
Type summary
• Changeover between heating and cooling operation automatic, or with changeover
sensor QAH11 or manual
• Changeover of operating mode with window contact, occupancy detector or standby
button
• Control of 3 fan speeds automatic or manual, with max. 230 VA for speed 1 and
450 VA for speed 2 & 3
• Outputs for one (ACR12.32x) or two (ACR12.34x) thermic valves with pulse duration
modulation for heating and /or cooling, AC 230 V
• ACR12.32x/ALG with relay output for electric heater with max. 12.5 A
Application Operating panel Type reference
2-pipe fan coil with or
without electric heater
Analogue
With display
4-pipe fan coil Analogue
With display
Cable sensor for changeover or return air temperature
Valve actuator for 3 W... / 4 W... valve
Valve actuator for VD100 valve
ACR12.320/ALG
ACR12.321/ALG
ACR12.340/ALG
ACR12.341/ALG
QAH11
STE22 *
STE21 *
Ordering
Technical design
Setpoints
* for max. 1 actuator per output
When ordering, please specify the type reference as shown in the „Type summary“.
The room temperature is measured by an inbuilt sensor and compared to the selected
setpoint. According to the resulting deviation, the processor calculates the pulse duration ratio for control of the thermic valve actuators and, if necessary, for the electric
heater. At the same time, the optimum fan speed is automatically selected if the fan
speed selector switch on the controller is set to "Auto“.
The user can choose between P (proportional) and PI (proportional/integral) control.
These and other settings can be made on the device using DIP switches.
The P (proportional) bands for the heating and cooling sequences can be set separately between 2 K and 4 K (see switches S5 and S6).
The integral action time I (integral) is 5 minutes (if switch S7 = on).
In comfort operation, the heating setpoint is fixed at 20 °C and the cooling setpoint at
23 °C. The room user can adjust the setpoints by ± 6 K (Kelvin). This produces a setpoint range of 14...26 °C in heating operation and 17...29 °C in cooling operation. The
neutral zone remains constant at 3 K.
The setpoints for economy operation are at 14 °C for heating and 30 °C for cooling.
The room user can adjust the setpoints by ± 6 K. This produces a setpoint range of
8...20 °C in heating operation and 24...36 °C in cooling operation The neutral zone
remains constant at 16 K.
In standby operation, the controller is permanently set to an 8 °C heating setpoint.
Adjustment is prohibited, due to the norms of individual countries. Cooling operation is
not possible.
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Siemens Building Technologies Fan coil controller for wall mounting ACR12 CE1N3573E
HVAC Products 17.08.2001
Control sequence
4-pipe fan coil
Y [%]
100
80
50
YKYH
3574D02
Control sequence
2-pipe fan coil with
electric heater
C/O (changeover)
cooling
Control sequence
2-pipe fan coil with
electric heater
C/O (changeover)
heating
Q
H
X
p
W
H
W
K
X
dz
X
p
4-pipe systems, for controller types ACR12.340/ALG and ACR12.341/ALG
Y [%]
100
YKYHE
80
50
Q
H
YHE
YH
EX
X
p
W
H
W
K
X
dz
p
Y [%]
100
Q
K
3574D10
Q
K
3574D09
Q
H
XpEX
p
W
H
Controller types ACR12.320/ALG / ACR12.340/ALG and ACR12.321/ALG /
ACR12.341/ALG
Q
H
Q
K
X
p
Heating load W
Cooling load W
P-band X
PE
H
K
Heating setpoint
Cooling setpoint
P-band electric heater
Y Positioning variable
YH Heating output with ACR12.32x/ALG + ACR12.34x/ALG c/o activated
YHE Electric heater output with ACR12.32x/ALG
YK Cooling output with ACR12.32x/ALG + ACR12.34x/ALG, c/o deactivated
3/10
Siemens Building Technologies Fan coil controller for wall mounting ACR12 CE1N3573E
HVAC Products 17.08.2001
Electric heater
There is also an inbuilt relay for direct connection of an electric heater.
The control of the heater depends on the control deviation (pulse duration modulated)
The P-band of the electric heater is:
− Control sequence 2-pipe fan coil c/o (changeover) cooling = 2 K (S5=on)
− Control sequence 2-pipe fan coil c/o (changeover) cooling = 4 K (S5=off)
− Control sequence 2-pipe fan coil c/o (changeover) heating = 0.4 K (S5=on)
− Control sequence 2-pipe fan coil c/o (changeover) heating = 0.8 K (S5=off)
The cycle time is 240 s. For safety reasons, max. 50 % of heating output is manual
possible at fan speed I (relay 120 s "on" and 120 s "off"), at speed II max. 80 % and at
speed III max. 100 %.
Changeover between heating and cooling operation
If no C/O (changeover) sensor is connected and terminals B2-M are open, the controller is in cooling operation. Changeover to heating operation takes place manually on
the device. If a C/O sensor type QAH11 is connected, or terminals B2-M are getting
bridged by means of an external switch, changeover is automatic. The controller detects a C/O sensor automatically. In this case, the manual C/O switch is deactivated.
Above the entry key of the changeover sensor, the types ACR12.320 and 340 are indicating with LED`s, the operation of heating or cooling.
!
Valves
( See also on page 6: Factory settings )
The switching hysteresis is shown in the following diagram.
S11 = on S11 = off
M off
17°C
27°C
T
17°C
35°C
Changeover hysteresis
heating
cooling
Mfan
T temperature
Thermic valves with AC 230 V control must be used.
The control algorithm is optimised for STE2x actuators.
Motoric on/off valves must not be used.
39°C
3574D05
T
Fan operation
The fan can be controlled in two different automatic operation modes (manual fan
speed selector switch on the controller set to "Auto“). Ventilation can remain set at
speed I in the neutral zone (control-free zone) or be switched off.The fan start from 0 to
stage 1 is linked with a booster call instruction, to beginn with stage 3 for 1 s to warrent
a safety start.
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Siemens Building Technologies Fan coil controller for wall mounting ACR12 CE1N3573E
HVAC Products 17.08.2001
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