The AQUA24A3/D is a P/PI controller designed for controlling room temperature or supply air temperature inHVAC systems. The controller has small size and is designed for DIN-rail mounting.

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Three continuous control outputs, 0 - 10 V.

Two heating and one cooling sequence.

P/PI controller

Controller with three outputs 0 - 10 V

Operation

SetpointThe AQUA24A3/D can be used with the built-in setpointknob or,optionally, with an external setting device. Thesetpoint controls the temperature at the main sensor.

Setpoint ControlThe setpoint can be shifted from the preset value byapplying an external control voltage to the SPC-input(Setpoint Control). The setpoint can be shifted -15K to +15Kfrom the set value by applying 0 - 10 V DC to the SPC input.No shift at 5 V DC. If the input is left open it is internally heldat zero shift.

Damper limitingBy using a TBI-100 potentiometer it is possible to maximumor minimum limit the output signal to a damper actuator.

AQUA24A3/D

SPC (Setpoint control).

All settings accessable on the front.

Damper limiting.

The AQUA24A3/D is a PI controller but can also be set torun as a P controller. It has three sequential outputs for twostages heating and one stage cooling (0-10 V DC).The neutral zone between heating and cooling is adjustable.Output Y1 and Y2 will increase on increasing heat demandand output Y3 will increase on increasing cooling demand.

Main sensorFor supply air temperature control or room temperaturecontrol. The controller can be set for P- or PI-control.

Limiting sensor, cascade controlWhen running room temperature control the controller maybe wired as a cascade controller with the main sensor in theroom and a limiting sensor in the incoming air duct.A temperature deviation in the room results in a shift of theduct controller setpoint. The size of the shift is determinedby the cascade factor CF. The cascade factor is defined asthe shift of the duct controller setpoint that is set at a roomtemperature deviation of 1°C.The duct temperature can, when running cascade control, beboth maximum- and minimum- limited.Room and duct temperature controllers can individually beset for P- or PI-control.

section position

2-240Jun 96

F O R I N D O O R C L I M A T E W I T H O P T I M U M C O N T R O L

Regin Controls Asia Pacific Pte Ltd66 Tannery Lane #03-04 Sindo BuildingSingapore 347805

Phone: +65 6747 8233Fax: +65 6747 9233

www.regin.com.sgEmail: info@regin.com.sg

that the start position is determined solely by the Pdeviation at the time of starting. When the sensortemperature equals the setpoint value, the startingpoint is centered between Y1 and Y2.

Technical data

GeneralSupply voltage 24 V AC +/- 15%, 50 - 60 HzPower consumption Max. 5 VAAmbient temperature 0...50°CStorage temperature -40...+50°CAmbient humidity Max 90% RHDimensions (w x h x d) 105 mm (6 modules) x 85 mm x 75 mmForm of protection IP20CE This product conforms with the requirements of European EMC standards CENELEC

EN 50081-1 and EN 50082-1 and carries the CE mark.InputsSensor inputs Two (2) inputs for main sensor and limit sensor.

See Section 6-100 for choice of sensor. Limit sensor must be 0...60°C.Setpoint control (SPC) The setpoint can be shifted -/+ 15K with a control voltage of 0-10V. 5 V produces no shift.Setpoint input The setpoint can be set with an external setpoint potentiometer.Shutdown signal The fan supervision signal controls the switching between running and shutdown mode.

The contact should be closed when the fan is running.OutputsControl signals Y1, Y2 (heating), Y3 (cooling). 0 - 10 V DC, max 1 mA. Short-circuit protected.

Setting options Factory settings in bracketsSetpoint 0...30°CPd (Single sensor) 2...100K ( 18K ).Id (Single sensor) 1.7...20 minutes ( 8 min ).Ir (Cascade control) 3...33 minutes ( 20 min ).CF 0.5...15K ( 5 K ).Min 0...30°C ( 15°C ).Max 20...60°C ( 40°C ).Nz 0...5K ( 0 K ).

Shut-down modeThe AQUA24A3/D has an input which is to be connected tothe supply-air fan relay. When the supply air fan is stopped inthe normal manner, the controller changes to shut-downmode. Both outputs are set to zero.On restart, the integrators are reset to zero which means

Operating switches1 Setpoint A: Built-in. B: External.2 Duct controller. A: P-control. B: PI-Control. (room controller on single-sensor room control).3 Room controller when running cascade control: A: P-control. B: PI-control.4 A: Duct temperature control or single sensor room control. B: Cascade control.

Wiring and front panel settings

Id=Reset time, single sensor

CF=Cascade factor

Max=Maximum limit

Min=Minimum limit

Operating switches

Pd=P-band, single sensor

Power on/off

Output indicator

Nz=Neutral zone

Setpoint

Ir=Reset time cascade123456

8910111213141516

Main sensorLimit sensor

Signal neutralSignal neutral

+10V DC0-10V inSPC 0-10V DC inSignal neutralY1Y2Y3Neutral24V AC inFan supervisionSignal neutral

Supplyvoltage

Outputs0 - 10V DCmax 1 mA

Externalsetpoint

Not connected

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