771771

Electronic differentialpressure control valve

Technical dataThe Cim 771 valves are available in sizes from ½” DN 15 to 2” DN 50. One valve can manage two differential pressure sensors through the microswitches located be-neath the cover of the actuator. The differential pressure sensors work within the following operating ranges: 0-600 mbar 0-1000 mbar

Operating pressure: PN 16Operating temperatures: 0-100°C (maximum peaks -25°C to 120°C

Cim 771 is composed of: characterized ball valve that allows the fl ow rate to be controlled through equal

percentage variation by changing the ball’s opening angle with the Venturi noise reduction profi le;

differential pressure sensor with integrated temperature sensor; electric actuator with electronic adjustment and control system; the actuator allows the ΔP set point to be set to the project value. The actuator can

be set to cover various differential pressures by slightly increasing the product’s operating ranges. The signal from the sensor is constantly compared with the set point so that the difference between the two is eliminated. This difference is also monitored and kept constant in the case of system pressure fl uctuations.

Technical data for the electric actuatorThe actuator for the Cim 771 is fi tted with a potentiometer that is used to set the required differential pressure (set point). This pressure appears on the display (in mbar). A few seconds after selecting the set point, the display will automatically con-vert to showing the differential pressure that exists between the two points on the circuit where the pressure data is recorded. The actuator is fi tted with microswitches that allow the direction of rotation of the ball to be managed, pressure switches with different full scale values to be connected and the control logic to be selected.

Operating principle

As the heat requirements vary, the fl ow rates change in the heat exchangers located in the various environments. These variations involve a change in the system’s DP, which is detected by the valve, which in turn modifi es its opening in order to restore the initial project conditions. The signal from the sensor is constantly compared with the set point so that the difference between the two is eliminated. This difference is also monitored and eliminated in the case of system pressure fl uctuations.The electronic control system can be interfaced with the building’s management systems (domotic) in order to optimize energy consumption.

the various environments. These variations involve a change in the system’s DP, which is detected by the valve, which in turn modifi es its opening in order to restore the initial project conditions. The signal from the sensor is constantly compared with the set point so that the difference between the two is eliminated. This difference is also monitored and eliminated in the case of system pressure fl uctuations.The electronic control system can be interfaced with the building’s management systems (domotic) in order to optimize energy consumption.

1 Non linear characteristic of heat exchangers in HVAC systems.

2 Linear relationship between the emission of heat from the heat exchanger and the opening of the control valve.

3 Valve with equal percentage fl ow characteristic.

1

2

3

Angle = 0° Angle = 45° Angle = 72° Angle = 90°

28017 San Maurizio d’Opaglio (NO) - Italy - Via Torchio, 57 - C.P. 106Te l . + 3 9 0 3 2 2 9 2 3 0 0 1 - F a x : + 3 9 0 3 2 2 9 6 7 2 1 6 / 9 6 7 7 5 5

s k y p e : c i m b e r i o s k 1 , c i m b e r i o s k 2info@cimberio.it

®

www.cimberio.com© Copyright - Cav. Uff. GIACOMO CIMBERIO S.p.A. - All rights reserved. Tutti i diritti riservati. - Stampa: Poligrafi ca Moderna - Novara - 03/2012 - REV. 3

PropertiesPower supply voltage: 24VFrequency: 50 HzPower consumption: 5WAngle of rotation: 90°Protection class: IP44

Technical data for the sensorThis component includes a differential pressure sensor and a temperature sensor.

Properties Differential pressure range: 0-0.6 bar or 0-1.0 bar Pressure signal response time: < 0.5 s Operating temperature: 0-100°C Temperature measurement range: 0-100°C Temperature signal response time: < 1.0 s Maximum peak temperatures of the fl uid: -25° to 120°C Static pressures: max 16 bar @ 70°C; max 12 bar @ 100°C Power supply: 5V DC Pressure signal: 0.5 - 4.5 V Temperature signal: 0.5 - 4.5 V Power consumption: < 50mW Protection class: IP44

Operating temperature range: 0-55°CStart-up torque: 12NmCable length: 1000 mmMaximum differential pressure: 16 barPosition indicatorCan also be manoeuvred manually

reduction profi le; differential pressure sensor with integrated temperature sensor; electric actuator with electronic adjustment and control system; the actuator allows the

be set to cover various differential pressures by slightly increasing the product’s operating ranges. The signal from the sensor is constantly compared with the set point so that the difference between the two is eliminated. This difference is also monitored and kept constant in the case of system pressure fl uctuations.

Technical data for the electric actuatorThe actuator for the required differential pressure (set point). This pressure appears on the display (in mbar). A few seconds after selecting the set point, the display will automatically con-vert to showing the differential pressure that exists between the two points on the circuit where the pressure data is recorded. The actuator is fi tted with microswitches that allow the direction of rotation of the ball to be managed, pressure switches with different full scale values to be connected and the control logic to be selected.

PropertiesPower supply voltage: 24VFrequency: 50 Hz

Voltage U/Umax

Flo

w r

ate

Kv/

Kvs

An

gle

of

rota

tio

n [

°]

Cim 771Electronic differential pressure control valve

The Cim 771 valves are designed to automatically balance heating and air-conditioning sy-stems regardless of pressure changes. The particular structure of the Cim 771 valves allows them to perform two different functions:

RegulationSelecting of the differential pressure required for the project, within the operating range.

ControlMaintaining of the project’s differential pressure, regardless of pressure fl uctuations cau-sed by load variations in the system.

ELECTRONIC DIFFERENTIAL PRESSURE CONTROL VALVE771

C

128

132

139

150

162

183

ØE

15

20

25

32

40

50

CH

25

31

40

49

55

69

Kv

3,9

7,7

12,7

22,7

38,6

60

B

172

172

172

178

184

195

A

145

149

153

161

172

179

DN

1/2

3/4

1”

11/4”

11/2”

2”

Cim 771

771

The main characteristics of the Cim 771 valves are:

Ease of selecting the project’s differential pressure by means of a switch, with on-board display of the set value.

Direct reading of the current differential pressure value on the valve’s on-board display.

Maintaining of the project’s differential pressure regardless of pressure fl uctuations in the system’s branches.

Flexibility of use with regard to system modifi cations which may be required after the initial installation.

Reduction in the costs of the balancing operations, energy sav-ings and improved environmental comfort.

The possibility of obtaining the temperature reading of the wa-ter fl owing through the valve.

Allows existing systems without advanced control systems to be optimized, without signifi cantly impacting costs.

When the product is integrated with the building’s management systems, data can be acquired in order to optimize the use of energy.

Potentiometer for adjusting the proportional parameter Xp

The “Xp” parameter is the proportional factor for the actuator equipped with an integrated PI controller (from 10 to 999).The proportional factor of the controller can be modified using the regulating potentiometer located be-neath the actuator’s cover. It is used to regulate the stability of the system. In other words, it indicates the differential pressure limits that identify the peaks above which the regulator exceeds the modulation area, remaining permanently open or closed. Operating diagram of the regulator based on the ΔP:Example:- desired ΔP (set point): 500 mbar- Xp parameter = 200The closer you are to the desired value, the shorter the impulses will be.

Valve permanently openWhen the ΔP is below 400 mbar, the controller sends a constant sig-nal for the opening of the valve.

Opening of the impulse valve When the ΔP is between 400 and 500 mbar, the controller opens the impulse valve. As you come closer to the desired value (500 mbar), the im-pulses become increasingly shorter.

Closing of the impulse valveWhen the ΔP is between 500 and 600 mbar, the controller closes the impulse valve. As you come closer to the desired value (500 mbar), the im-pulses become increasingly shorter.

Valve permanently closedWhen the ΔP is above 600 mbar, the controller sends a constant si-gnal for the closing of the valve.

Whenever the position of DIP1 is changed, the actua-tor closes the valve and resets the differential pres-sure signal. The message “CAL” appears on the dis-play during this closing and resetting phase.

Note:If the actuator is already in the closed position, then the calibration will be done immediately. The calibra-tion cannot be carried out if the input signal for the differential pressure sensor is not within the range 0.5 ± 0.25 V.

Microswitch no. 1Used to select the mode by which the actua-tor manages the differential pressure sensor.

Microswitch no. 2Used to select the operating range for the differential pressure sensor to be used.

Microswitch no. 3Used to select the rotation direction of the electric actuator.

Note:Whenever the position of DIP3 is changed, the ac-tuator begins the calibration procedure. The green LED beneath the cover begins to fl ash (1x/s) and the actuator rotates between the extreme right and left positions. During this phase, leave the actuator in the auto position, do not change any setting and do not cut the supply of power!

Microswitch no. 4Used to select the actuator’s response time.

Opening of theimpulse valve

Closing of theimpulse valve

Valvepermanently

closed

Valvepermanently

open

Setting the microswitches

DIP 1 - OFFINVERSE mode

DIP 1 - ONDIRECT mode

DIP 2 - OFFdifferential pressuresensor 0-600 mbarDIP 2 - ONdifferential pressuresensor 0-1000 mbar

DIP 3 - OFFcounterclockwise (CCW) directionof rotation for openingDIP 3 - ONclockwise (CW) direction of rotation for opening

DIP 4 - OFFslow response time of the controllerwith regard to changes in the ΔPDIP 4 - ONfast response time of the controllerwith regard to changes in the ΔP

Note:To adjust the project’s differential pressure value Δp, remove the cap (9) and use a small screwdriver to rotate the potentiometer. To modify the factory setting of the microswitches and the “Xp” parameter, you must loosen the screw (1) and remove the lever (7). Now completely loosen the three screws (11) and remove the cover (10). The microswitches are adjusted using a small screwdriver. When this operation is complete, remount all the components in reverse order.

Electronic differential pressure control valve

1 Metal screw which fastens the lever (7) to the body of the actuator.2 LED located under the cover that indicates the operating status of the

actuator:• light steady on = normal operation;• light fl ashing 1/s = the actuator is in the calibration phase;• light fl ashing 2/s = insuffi cient voltage.

3 Potentiometer positioned under the cover, for regulating the Xp param-eter.

4 LCD display which shows the differential pressure value (Δp) expressed in mbar.

5 Microswitches positioned beneath the cover.6 Mechanical indicator of the opening degree of the ball. The indicator can

be removed or repositioned based on the type of microswitch setting.7 Lever for manually controlling the actuator. It also gives the indication

regarding the positioning of the ball valve.8 Button for the manual/automatic control of the actuator. Automatic op-

eration is deactivated by pressing and turning this button 90° and the ac-tuator can be manually moved by means of the lever (7).

9 Cap over the potentiometer which allows the project’s differential pres-sure (Δp) to be selected (using a screwdriver). When adjusting the Δp, the LCD display fl ashes showing the selected value (set point). After a few seconds the LCD display automatically returns to the fi xed displaying of the current differential pressure.

10 Actuator cover.11 Fastening screw holding the cover to the body of the actuator.