CALECTRO CFA-24V Manuale utente

Calectro AB Phone: +46 31-69 53 00 info@calectro.com www.calectro.com

CFA-24V / CFA-230V INSTALLATION INSTRUCTIONS

ENGLISH

Electronic freeze protection alarm with

warming function, double relays and digital

display.

CFA-24V Freeze protection alarm 24V AC

CFA-230V Freeze protection alarm 230V AC

WARNING: IMPORTANT

INFORMATION

CONCERNING

ELECTRICAL SAFETY

AND ENVIRONMENT

This product may contain dangerous volt-

age. The product’s housing is not meant

to be removed. At a supply voltage of

230V AC the product must be powered

via a nearby mains switch labelled “Mains

Switch for CFA freeze protection alarm”.

The product’s relay switch can be powered

with 230V. The power must be switched off

during maintenance. The product is intend-

ed for indoor use only. The product must

not be subjected to liquid or moisture. The

product’s exterior can be cleaned using

a damp cloth. The product is intended for

mounting on a DIN rail / Norm enclosure in

a protected space.

INDEX

1. Technical Data

2. Function

3. Use

4. Installation

5. Maintenance

6. Buttons and menu system

7. Selection of temperature sensor type –

factory setting: Pt1000

8. Setting the setpoint

9. Resetting the alarm

10. Fine-adjustment of the temperature

measurement

11. Display example

12. Error codes and temperature / Ohms table

13. Figures

14. Connection examples for CFA-24V and

CFA-230V

15. Menu system – monitoring / shortcut menu

1. TECHNICAL DATA

Supply voltage

CFA-24V: 24V AC ±10%,

CFA-230V: 230V AC ±10% 50-60 Hz

Relay outputs: 250V ~5 A resistive

loading, potential-free

changeover

Power consumption: 4W

Output signal: 0-10V or 10-0V

Temperature range

Alarm temperature: 0 to 20°C

Warming function: 5 to 50°C

Ambient temp.: 0 to +40°C

Selectable

temperature sensor: Pt1000 (factory setting),

NTC (Calectro type: 22/

33/44/55/99), Pt100,

Ni1000, and PTC

(Calectro type: 95)

Mounting: DIN rail, Norm enclosure

Dimensions WxHxD: 52.5 x 86 x 59 mm

Weight: 240 gram

Protection class: IP20

2. FUNCTION

CFA is connected to a temperature sensor that

measures the water temperature in the heating

coil. The water temperature in the heating coil is

normally regulated by another regulator/DUC with the

control signal (0-10or 10-0V) connected viaCFAtothe

control valve. If the water temperature in the coil

drops without any response from the regulator /

DUC, CFA starts regulating the control valve.

When the water temperature in the coil drops below

the pre-set alarm temperature, both relay outlets fall

(normally activated).

Daytime mode

During daytime the control signal regulates with a

proportional band of 4°C. The control signal begins

regulating when the temperature drops to the pre-set

alarm temperature plus one degree plus the

proportional band.

Example 1: Alarm temperature = 5°C: The control

signal begins regulating at 10°C (5+1+4).

Example 2: Alarm temperature = 5°C: At or under

6°C the control signal is 100%.

Temperature

Control signal

Alarm temperature

0% 1°C 4°C p-band

100%

DAYTIME MODE

Daytime mode is activated by a short circuit

between terminals 9 and 12. During daytime

mode, D4 is shown in the top right-hand corner

of the display and DI (under °C) is lit to indicate

that the digital input (DI) is short-circuited.

  



Night mode / warming function

During night mode (warming function) the water

temperature in the heating coil is regulated by

a setpoint that is adjustable between 5 and 50°

(proportional band: 10°C).

Temperature

Control signal

alarm temperature

0% 10°C P-band

100%

NIGHT MODE

Warming function

setpoint

Night mode is activated by cutting any jumpers

between terminals 9 and 12.

 



Self-test

During start-up and the replacement of

temperature sensors, CFA performs a self-test.

Three lines begin to blink at the bottom of the

display. The current temperature shows up here

on completion. Interruption on the temperature

sensor circuit shows up as Er0 on the display,

and Er1 for short circuit. Upon interruption or

short circuit, the alarm relays fall and the control

signal goes to 100%.

3. USE

CFA is an electronic freeze protection alarm with

a digital display that is used to monitor frost in

air heating systems that use water as the heat

carrier.

4. INSTALLATION

CFA is mounted on a DIN rail and is suited to

Norm enclosures.

5. MAINTENANCE

CFA requires no maintenance.

The setpoint for warming function (night mode),

which is shown in the display’s top right-hand corner,

now begins to blink. Use ▲ to ▼ change to desired

value and press Enter to confirm ( ). Ready!

Enter

 



These settings can also be changed during an alarm.

9. RESETTING THE ALARM

When the alarm triggers, the relays remain in alarm

mode until the reset button is pressed.

Freeze alarm in daytime mode

Reset

Alarm

  



Freeze alarm in night mode

Reset

Alarm

 



If the alarm mode returns to normal temperature

when the Reset button is pressed, the relays are

reset and the middle button returns to the Menu

function.

If the alarm is still triggered after the Reset button is

pressed, the relays have not been reset and Alarm

and Reset blink three times. The middle button then

returns to the Menu function for 20 seconds to allow

settings to be changed in the menu system before

returning to Reset.

Reset depressed in alarm mode (daytime mode)

Reset

Alarm

  



Reset depressed in alarm mode (night mode)

Reset

Alarm

 



6. BUTTONS AND MENU SYSTEM

▲ = Step up in the menu / increase value - Keep

the button depressed and the setpoint counts up

rapidly.

▼ = Step down in the menu / decrease value -

Keep the button depressed and the setpoint

counts down rapidly.

= Is a multifunction button, the current status*

of which is shown on the display next to the but-

ton.

* Middle button functions:

• Exit Menu = Exit the menu / Save setting

• Menu = Enter the menu or select application

• Enter = Confirm setting

• Reset = Resets the relay after an alarm.

Enter

Reset

Exit

The menu system comprises of the following

sub-menus:

1. Selection of temperature sensor

2. Fine-adjustment of the temperature

measurement

4. Selection of output signal: 0-10 or 10-0V

5. Exit the menu system

7. SELECTION OF TEMPERATURE

SENSOR

CFA can be connected to a range of temperature

sensors: Pt100, Pt1000, Ni1000 plus Calectros

NTC and PTC sensors in the ETF series. Pt1000

is a factory set sensor.

2. Press the Menu button ( ) to enter the

menu system

3. The current type of temperature sensor is

shown

4. Press Menu-Enter to change the tempera-

ture sensor type

5. The current sensor type begins to blink and

you can now use the arrow buttons to select

another sensor type. Press Enter to confirm

your selection.

6. Use the arrow keys and confirm Exit-Menu

to exit

8. SETTING THE ALARM TEMPERATURE

AND HEAT RETENSION SETPOINT

To change the alarm temperature, press ▲ or

▼ to the desired value. The alarm temperature,

which is shown in the top left-hand corner, blinks

during setting. Press Enter to confirm ( ).

Enter

  



The alarm temperature and warming function

setpoint can always be adjusted, even during

alarm mode. See 8.

10. FINE ADJUSTMENT OF THE

TEMPERATURE MEASUREMENT

The temperature measurement in CFA can be

adjusted if necessary. Range: -3°C to +3°C in

steps of 0.1°C.

1. Press the Menu button ( ) to access the

menu system

2. Press the arrow key until ‘Adj’ shows on the

display

3. Press Menu-Enter to adjust

4. The current compensation and temperature

starts to blink and you can now adjust the

compensation using the arrow keys. Press

Enter to confirm your selection ( ).

5. Use the arrow keys and confirm Exit-Menu

to exit

11. DISPLAY EXAMPLE

The below example shows CFA in daytime

mode. The freeze alarm has triggered.

Reset

Alarm

  



Current temperature

Digital inlet

short circuited = daytime mode

Daytime mode: 4°C

p-band

Both relays have

been deactivated =

alarm mode

Alarm temperature

Alarm mode

The below example shows CFA in night mode

/ warming function. The freeze alarm has trig-

gered.

Reset

Alarm

 



Current temperature

Night mode/

warming function

Both relays have

been deactivated =

alarm mode

Alarm temperature

Alarm mode

12. ERROR CODES

CFA monitors the temperature sensor so that a

short circuit or interruption on the sensor circuit

triggers the alarm and sets the control signal at

100%.

Er0 Interruption on the sensor input

Er1 Short circuit on the sensor input

Er2 Temperature sensor out of range

Temperature / Ohm table

Sensor type Temperature Ohm

Pt1000 0°C

20°C

40°C

1000

1078

1156

Pt 100 0°C

20°C

40°C

100

107. 8

115.6

Ni1000 0°C

20°C

40°C

1000

1090.7

1185.7

NTC

(Calectro type

22/33/44/55/99)

0°C

20°C

40°C

37942

14871

6539

PTC

(Calectro type 95)

0°C

20°C

40°C

1631

1915

2226

13. FIGURES

FIG. 1

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

60 86

52,5/3 mod.

29 19 11

FIG. 2 (CFA-24V)

The relay outputs are shown in alarm/

no power on condition. Max 5A, 250V.

24V AC

Relay 1

Relay 2

1 2

L N

3 4 5 6 7 8

9 10 11 12 13 14 15 16

GND

Temp. sensor

Digital in

Analogue out

Analogue in

Not used

RC/

DUC

FIG. 3 (CFA-230V)

The relay outputs are shown in alarm/

no power on condition. Max 5A, 250V.

230V AC

Relay 1

Relay 2

1 2

L N

3 4 5 6 7 8

9 10 11 12 13 14 15 16

GND

Temp. sensor

Digital in

Analogue out

Analogue in

Not used

RC/

DUC

14. CONNECTION EXAMPLE FOR CFA-24V AND

CFA-230V

The relays are shown in alarm/ no power on

condition.

1 2

24V AC

The relays are shown in a de-energised state

3 4 5 6 7 8

Relay 1 Relay 2

1 2

230V AC

The relays are shown in a de-energised state

3 4 5 6 7 8

Relay 1 Relay 2

Calectro AB Phone: +46 31-69 53 00 info@calectro.com www.calectro.com

15. MENU SYSTEM – MONITORING

Enter

Pt1000

Enter

Adj



Enter

Pt1000 Enter

Pt100 Enter

Enter



Enter

Exit

P TC Enter

NTC

Save settings and return to the normal display position through Exit-Menu.

Enter

Select the desired output signal: 0-10V or 10-0V. Confirm with Enter.

Enter

Ni 1000



Adj

Enter

   

Enter

 

  



  



Press Menu to access the Menu System.

Navigate between the submenus using the arrow

keys and select sub-menu with Menu-Enter.

Select the type of temperature sensor. Navigate between the different types and confirm with Enter.

If necessary the temperature measurement may be fine-tuned (-3.0 to +3.0°C). Confirm with Enter.

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