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Siemens Building Technologies Fan coil controller for wall mounting ACR12 CE1N3573E
HVAC Products 17.08.2001
Functions
• 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
Type summary
Application Operating panel Type reference
2-pipe fan coil with or
without electric heater
Analogue
With display
ACR12.320/ALG
ACR12.321/ALG
4-pipe fan coil Analogue
With display
ACR12.340/ALG
ACR12.341/ALG
Cable sensor for changeover or return air temperature
Valve actuator for 3 W... / 4 W... valve
Valve actuator for VD100 valve
QAH11
STE22 *
STE21 *
* for max. 1 actuator per output
Ordering
When ordering, please specify the type reference as shown in the „Type summary“.
Technical design
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 dura-
tion 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 sepa-
rately between 2 K and 4 K (see switches S5 and S6).
The integral action time I (integral) is 5 minutes (if switch S7 = on).
Setpoints
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 set-
point 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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