Siemens ACR12.3 1 Series User manual

CE1N3573E

17.08.2001

Siemens Building Technologies

HVAC Products

3573

ACR12.320/ALG ACR12.321/ALG

ACR12.340/ALG ACR12.341/ALG

Fan coil controller

for wall mounting

ACR12.3x0

ACR12.3x1

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 ( è

èè

è) and changeover switch

(/) are memorised on power failure.

Use

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

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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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Siemens Building Technologies Fan coil controller for wall mounting ACR12 CE1N3573E

HVAC Products 17.08.2001

HQK

XpXp

QHW

3574D02

YKYH

Y [%]

Xdz

100

4-pipe systems, for controller types ACR12.340/ALG and ACR12.341/ALG

HQK

XpEX

QHW

3574D10

YKYHE

Y [%]

Xdz

100

3574D09

YHE YH

XpEX

Y [%]

100

Controller types ACR12.320/ALG / ACR12.340/ALG and ACR12.321/ALG /

ACR12.341/ALG

QHHeating load WHHeating setpoint

QKCooling load WKCooling setpoint

XpP-band XPE P-band electric heater

YPositioning 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

Control sequence

4-pipe fan coil

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

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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 control-

ler 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 de-

tects 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 indi-

cating with LED`s, the operation of heating or cooling.

( See also on page 6: Factory settings )

The switching hysteresis is shown in the following diagram.

S11 = on S11 = off

17°C 39°C T

27°C T

3574D05

35°C

M off

17°C

Changeover hysteresis

heating Mfan

cooling 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.

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.

!Valves

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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.

010 50 80 100

0105080100

3573D06

QK [%]

QH[%] WHWKXp

XpXdz

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.

WHWK

XpXdz

50 80 1005080100

3573D07

QK[%]

QH[%]

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 WHHeating setpoint

Q2 Fan speed 2 WKCooling setpoint

Q3 Fan speed 3 XpP-band

QHHeating load Xdz Neutral zone

QKCooling 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.

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HVAC Products 17.08.2001

Switch designation S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12

Operating mode 1 (Comfort* <-> Standby**)

Operating mode 2 (Comfort* <-> Economy**)

Operating mode 3 (Economy* <-> Standby**)

Operating mode 4 not used

off

Direction of operation of input DU1 normally closed

(Change of operating mode) normally open

off

Dwell time of the fan speeds: 2 minutes

1 minute

off

P-band heating 2 K

P-band heating 4 K

off

P-band cooling 2 K

P-band cooling 4 K

off

PI algorithm

P algorithm

off

Mode 1 Ventilation in the neutral zone OFF

Mode 2 Ventilation in the neutral zone ON

off

2-pipe application

4-pipe application

off

2-pipe application cooling / Valve + electric heater

2-pipe application cooling /Valve

off

Factory setting c/o hysteresis 17 °C – 27 °C

Fan "Off“ at c/o < 35 °C, c/o–hysteresis 17 °C – 39 °C

off

Indication °C

Indication °F

off

The factory settings are underlined and in bold print in the above table (on)

* Change of the operating mode can be made with the button on the controller,

by means of a window contact, occupancy detector or otherwise (terminals

DU1-GND). Input DU1-GND has a higher priority than the button.

** In case the controller is in operating mode marked **, the setpoint shift of ±6 K is

not active. If any operation is carried out on the front of the controller, the mode

changes to * and the setpoint shift of ±6 K is active again.

GND B2

DU1 MY1

Y10

Q14*

NNL

PE Q1 Q3

3574A09

3574A10

ACR12.340/ALG and ACR12.341/ALG // *ACR12.320/ALG and *ACR12.321/ALG

DU1 Operation mode control input (DIL: S1&S2), max. AC 25 V

GND Measuring neutral for control input

L, N Operating voltage AC 230 V

PE Earthing

Q14 Control output for electric heater

Y10 4-pipe application / control output for valve (cooling) / AC 230 V

MMeasuring neutral for sensor

B2 Changeover- or return air sensor QAH11

Y1 4-pipe application / control output for valve (heating) / AC 230 V

2-pipe application / control output for valve (heating or cooling) / AC 230 V

Q1 Control output for fan speed 1 / AC 230 V

Q2 Control output for fan speed 2 / AC 230 V

Q3 Control output for fan speed 3 / AC 230 V

Terminal assignment

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HVAC Products 17.08.2001

3.5 VA max.

NQ1 Q2 Q3 N Y1

3.5 VA max.

N Y10

450 VA max.

3573D08

PE B2 M

3Y1 Y10

AC 230 V / 50 Hz

DU1 GND

SELV

With 4-pipe applications (ACR12.340/ALG and ACR12.341/ALG), a return air sensor

QAH11 can be connected to terminals B2-M (S9 = off). In this case, the inbuilt

sensor is automatically deactivated.

The c/o or return air sensor input is connected with supply voltage of AC 230 V.

B2 Changeover sensor (ACR12.32x/ALG) or return air sensor (ACR12.34x/ALG)

E1 Electric heater

M1 3-speed fan

N1 ACR12.340/ALG or ACR12.341/ALG controller

N2 ACR12.320/ALG or ACR12.321/ALG controller

Q14 Control output for electric heater

S1 Window contact, occupancy detector

Y1 In N1 application, heating valve. In N2 application, cooling or heating valve

(changeover)

Y10 Cooling valve

4-pipe fan coil

!Important:

2-pipe fan coil

DU1 GND

3.5 VA max.

Q1 Q2 Q3 N Y1

12.5 A max.

N Q14

450 VA max.

3573D09

B2 M

3Y1 E1

AC 230 V / 50 Hz

SELV

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HVAC Products 17.08.2001

Project engineering

and wiring notes

−Only sensors and valves rated for AC 230 V may be used

−The cables to the controller, external sensor (maximum length 3 m), fan valves and to

the electric heater carry AC 230 V and must be appropriately sized

−The switching contacts for the signal inputs must be suited for low power

−The inputs of different controllers must not be connected in parallel. This means, one

switching contact must be used per input

−Wiring, fuses and earthing must be installed in compliance with local regulations.

It must be made certain that safety extra low voltage lines (SELV circuits) are clearly

separated from AC 230 V mains voltage cables

(also refer to Installation Instructions G3573X)

−The connecting wires inside the controller must be placed such that no pressure will

be exerted on components when the controller’s cover is closed

(also refer to Installation Instructions G3573X)

The controller is not approved for mounting on metallic surfaces unless the sur-

face is permanently connected to a protective conductor.

Safety instructions:

The controller must be installed by the customer according to the safety regula-

tions VDE 0700 / EN 60 335-2-73.

If the safety device is activated, the installation must be thoroughly checked

before the system is reset.

The controller may be opened only when isolated from the mains supply.

Fan with a total power consumption up to 75 VA on step 1 and 150 VA on step 2 and 3

No action needed

Fan with a total power consumption between 75 and 230 VA on step 1 and 150 and

450 VA on step 2 and 3

Check the current on the motor side when all 3 fan steps are supplied by 230 V

(maximum failure current). This current also has to respect all power limits (230

VA resp. 450 VA )

When these currants exceed the foreseen limits you have to place additional external

relais for all fan steps.

‘Schrack’ Type RT214730 ( 230 VAC input ; 12 Amps/250V relais contact ). For this

type a rail adapter is available (Schrack RT78625).

Important

!Safety check

Important

!Important applica-

tion instruction:

Recommended

relais type:

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Siemens Building Technologies Fan coil controller for wall mounting ACR12 CE1N3573E

HVAC Products 17.08.2001

AC 230 V / 50 Hz

PE L

N Q1 Q2 Q3

Q2Q3

450 VA max.

3573A07

Technical data

Operating voltage L, N, PE AC 230 V ±10 %

Frequency 50 Hz

Power consumption 20 VA (without field devices)

Protective earthing PE must be connected

Max. cross-sectional aera per terminal 2 wires each with 1.5 mm2

or 1 wire with 2.5 mm2

Fan control Q1, Q2, Q3 AC 230 V

Q1 load max. 230 VA (cos ϕ= 0.9)

Q2, Q3 load max. 450 VA (cos ϕ= 0.9)

Electric heater Q14 AC 230 V

Load (max., purely resistive) 2850 VA (AC 230 V / 12,5 A)

Contact life (B10)** 100,000 switching cycles

Load (reduced, purely resistive) 1250 VA (AC 230 V / 5.5 A)

Contact life (B10)** 300,000 switching cycles

** B10 = number of switching cycles reached by at least 90 % of the relays

Valve control Y1, Y10 AC 230 V

Load 3.5 VA (one thermic actuator

per output)

Changeover- or return air sensor B2 - M

Voltage against earth AC 230 V

Cable length max. 3 m

Temperature sensor QAH11 (NTC Element)

!Power supply

Electrical connections

Outputs

Inputs

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Siemens Building Technologies Fan coil controller for wall mounting ACR12 CE1N3573E

HVAC Products 17.08.2001

Signal input DU1- GND

Voltage against earth (SELV nach HD 384) AC 25 V

Cable length max. 100 m

Insulation class Ι

Degree of protection IP 30

Operation Class 3K5 to IEC 721

Temperature 0...50 °C

Humidity < 85 % rH

Transport Class 2K3 to IEC 721

Temperature –25...65 °C

Humidity < 95 % rH

- Conformity according to

EMV - directive 89/336/EWG

Low voltage directive 73/23/EWG

Electromagnetic compatibility

Immunity to interference EN 50082-1

Emissions EN 50081-1

Product safety

Automatic control devices for use in the

home and similar applications EN 60730-1

Special requirements for energy controllers EN60730-2-11

Colour RAL 9010

Protection class

Housing protection

Environmental

conditions

Norms and standards

Housing

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