Calectro AB Phone: +46 31-69 53 00 [email protected] 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 (0-10 or 10-0V) connected via CFA to the
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.
Menu
°
C
DI
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.
Menu
°
C
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.
© 2020.1
1.20 R1.1 Calectro
AB HFE656 EN
EN
