2. CIAT
  3. V6

CIAT V6 User manual

  • Hello! I'm a chat assistant familiar with the CIAT V6 series Thermostat, including models V6 A, V6 B, V6 C and V6 D. This document describes how to install, operate, and configure your thermostat. It covers features like fan speed control, operating modes, and how to use it with AC and EC motors, as well as with 2 and 4 pipe system configurations . Feel free to ask me any questions you have about your device!
  • What type of motors are supported?
    What are the operating modes available?
    Can I manually set fan speed?
    Can the thermostat automatically change modes based on water temperature?
    Can I lock the thermostat settings?
THERMOSTAT V6
05 - 2023
EN7626224-00
Instruction manual
CONTENTS
1 - GENERAL INFORMATION ...................................................................................................................................................... 3
1.1 - Safety instruction ................................................................................................................................................................. 3
1.2 - Operating limit. ................................................................................................................................................................... 3
1.3 - Main Features ..................................................................................................................................................................... 3
1.4 - Screen display ..................................................................................................................................................................... 4
1.5 - Setting the ventilation .......................................................................................................................................................... 4
1.6 - Setting the operating mode ................................................................................................................................................. 4
1.7 - Changing the operating mode ............................................................................................................................................. 5
1.8 - Air temperature measurement ............................................................................................................................................. 5
2 - OPERATION ............................................................................................................................................................................ 6
2.1 - 2P AC and 2P EC ................................................................................................................................................................ 6
2.2 - 4P AC and 4P EC ................................................................................................................................................................ 9
3 - INSTALLING THE UNIT .........................................................................................................................................................11
4 - TECHNICAL SPECIFICATIONS ............................................................................................................................................ 14
5 - CONFORMITY ....................................................................................................................................................................... 15
6 - TROUBLESHOOTING ........................................................................................................................................................... 15
7 - ENVIRONMENTAL PROTECTION ........................................................................................................................................ 15
The images in these documents are solely for illustration and are not contractual. The manufacturer reserves the right to change the design at any time without notice.
Translation of the original document
THERMOSTAT V6 EN-2
1 - GENERAL INFORMATION
The CIAT V6 electronic thermostat is designed to actuate fan coil units, for 2- or 4-pipe applications with an AC or EC motor


ventilation with either:
■A 230 V 3-speed AC motor.
■A 0 -10 V 3-speed EC motor.

1.1 - Safety instruction

                

in France and BS7671 in the UK.
1.2 - Operating limit.
The thermostat has a pollution degree of 2
■Ambient temperature and humidity

■Operating environment


event:
-SO < 0.02 ppm
-H2S < 0.02 ppm
-NO, NO2 < 1 ppm
-NH3 < 6 ppm
-N2O < 0.25 ppm

1.3 - Main Features
■Control of a manual or automatic 3-speed fan.
■Manual or automatic heating/cooling switching.
■Potential-free input for window switch.
■

Designation Motor Valve actuator Coil Model Reference
AC-2P + CO thermostat AC 3-speed 2 pipes V6 A 7625601
AC-4P thermostat AC 3-speed 4 pipes V6 B 7625602
EC-2P + CO thermostat EC 3-speed 2 pipes V6 C 7625603
EC-4P thermostat EC 3-speed 4 pipes  7625604
EN-3 THERMOSTAT V6
1 - GENERAL INFORMATION
1.4 - Screen display
B
C
D
E
F
B

C

Heating
Air conditioning
D
Economy mode
E
Low speed ventilation
Medium speed ventilation
High speed ventilation
Auto ventilation
F

1.5 - Setting the ventilation
The ventilation is set using the 


1.6 - Setting the operating mode
The thermostat's operating mode is adjusted using the 

or air conditioning mode, or thermostat automatic mode selection.
THERMOSTAT V6 EN-4
1 - GENERAL INFORMATION
1.7 - Changing the operating mode
The 

The operating modes are displayed as follows:
Mode Display Result
Comfort Comfort mode uses the temperature setpoint for control
The user CAN change the setpoint
ECO
(moon icon)

The user CANNOT change the setpoint
Frost protection
(FP)


If the thermostat is in air conditioning only mode, frost protection
mode will no longer operate.
The user CANNOT change the setpoint
O
Thermostat o

In this case, frost protection mode will no longer operate,
regardless
of the fan coil unit operation
(heating and/or air conditioning)
1.8 - Air temperature measurement



150 cm
150 cm
20 cm
min.
EN-5 THERMOSTAT V6
2 - OPERATION


2.1 - 2P AC and 2P EC
2.1.1 - Operating diagram
1
0
Valves
Fan
Setpoint 

3
2
1
0
B
B
Continuous ventilation
2.1.2 - Setting the temperature setpoint
 

The room temperature is the default display.
THERMOSTAT V6 EN-6
2 - OPERATION
2.1.3 - Water temperature measurement


Clamping collars Sensor adapter
Sensor
Water inlet pipe
Insulation
Sensor
Valve actuator Two-way valve
The changeover sensor measures the surface temperature of the pipe. There is obviously a dierence between
the actual water temperature and this surface temperature.

2.1.4 - Operating algorithm for automatic mode change (changeover)

Function Parameter 01 value CO function operation
Manual CO
Without CO sensor

Therefore the user must select the heating or air conditioning function.
WARNING: if the demand does not correspond to the water temperature, correct
operation cannot be guaranteed (e.g. heating demand with cold water in the pipes).
Air conditioning only mode
Without CO sensor


conditioning and ventilation only modes with manual speed.
Heating only mode
Without CO sensor

The user can no longer switch to air conditioning mode manually. S/he can only switch

Automatic CO
With CO sensor
In this mode, the CO sensor is required


-
-
If the water temperature does not correspond to the demand, the thermostat stops the fan
and closes the valve.



the thermostat no longer complies with the temperature setpoint.
 pictograms.
If the CO sensor is disconnected, the 
sensor.
EN-7 THERMOSTAT V6
2 - OPERATION
2.1.5 - 2P conguration

simultaneously for 5 seconds until 01 is displayed at the top right of the screen.

Parameters Description Setting range Default setting
01 

2 heating pipes only
2 cooling pipes only


Manual CO
02 Select the 2 operating modes
0: comfort/OFF mode
1: comfort/ECO mode
2: comfort/Frost Protection
0: comfort/OFF mode
03 
ECO setpoint 2 °C ~10 °C 5 °C
04 Frost protection mode setpoint 5 °C ~10 °C 8 °C
05  -8 °C ~8 °C 0
06  5 °C ~35 °C 35 °C
07 Minimum comfort setpoint 5 °C ~35 °C 5 °C
08 Low speed and valves hysteresis 0,5 °C ~3 °C 1 °C
10  NO/NC NO
11 Permanent ventilation selected S: Stop
 NS
12  
 0
13 Water temperature value Read-only
14 Hot water detection threshold for CO 30 °C ~ 80 °C 35 °C
15 Cold water detection threshold for CO 5 °C ~ 35 °C 18 °C
17(1) Low speed voltage 0-100 % of 10 V 30 %
18(1) Medium speed voltage 0-100 % of 10 V 60 %
19(1) High speed voltage 0-100 % of 10 V 90 %
20  0~100 20 %
21 Reset default values 
22 Software version 1
23 Software version 2
 
P19
P08
1
1
2
3
0
0
P08 P08
P11
1 °C 1 °C
1 °C 1 °C
P08
P18
P17
THERMOSTAT V6 EN-8
2 - OPERATION
2.2 - 4P AC and 4P EC
2.2.1 - Operating diagram
Valves
Fan


1
0
0
1
2
3
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
Air conditioning setpointHeating setpoint
B
B
Continuous ventilation
2.2.2 - Setting the temperature setpoints:
 

 
The dierence between the 2 setpoints depends on parameter 16 (see § 4P conguration). So, if P16 = 5 °C,
the dierence between the 2 setpoints will be at least 5 °C.


■Heating setpoint = 20 °C
■Air conditioning setpoint = 25 °C
■P16 = 5 °C

EN-9 THERMOSTAT V6
2 - OPERATION
2.2.3 - 4P conguration

simultaneously for 5 seconds until 01 is displayed at the top right of the screen.

Parameters Description Setting range Default setting
01 
Heating only
Cooling only
Heating/cooling
Heating/cooling
02 Select the 2 operating modes
0: comfort/OFF mode
1: comfort/ECO mode
2: comfort/Frost Protection
0: comfort/OFF mode
03 
ECO setpoint 2 °C ~10 °C 5 °C
04 Frost protection mode setpoint 5 °C ~15 °C 8 °C
05  -8 °C ~8 °C 0
06  5 °C ~35 °C 35 °C
07 Minimum comfort setpoint 5 °C ~35 °C 5 °C
08 Low speed and valves hysteresis 0,5 °C ~3 °C 1 °C
10  NO/NC NC
11 Permanent ventilation selected S: Stop
 NS
12  
 0
16 
conditioning setpoints 2 °C ~ 8 °C 5 °C
17(1) Low speed voltage 0-100 % of 10 V 30 %
18(1) Medium speed voltage 0-100 % of 10 V 60 %
19(1) High speed voltage 0-100 % of 10 V 90 %
20  0~100 20 %
21 Reset default values 
22 Software version 1
23 Software version 2
 
5
5
0
1
2
3
0
1
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
34
34
35
35
P17
P18
P08
P08 P08
P08
P16
P11 1 °C
1 °C1 °C
1 °C
P19
THERMOSTAT V6 EN-10
3 - INSTALLING THE UNIT
Mounting:
■
60 60
71
71
Electrical connection:
2P-AC and CO WALL THERMOSTAT
2 PIPES
Live
Neutral
High speed
Medium speed
Low speed
Valve actuator ph.
987 6 5 4 3 2 1
Window detect
N
L
HIGH

POWER
SUPPLY
CO SENSOR/

AC 230 V 50/60 Hz
VALVE FAN
LOW
VALVE

SENSOR
W - C
CO sensor

AC 230 V
50/60 Hz

LO.
V1 V2 V3 V4 V5 N L/PhV
ME. HI.
230 V
50/60 Hz
power supply
AC motor speeds
AC motor connection
to unit terminal strip.
AC 230 V 50 / 60 Hz
Unit terminal strip.
Valve actuator
phase.
AC 230 V 50 / 60 Hz
N L
 
EN-11 THERMOSTAT V6
3 - INSTALLING THE UNIT
4P-AC and CO WALL THERMOSTAT
4 PIPES
Live
Neutral
High speed
Medium speed
Low speed
Cold Valve actuator ph.
Hot Valve actuator ph.
9 8 7 6 5 4 3 2 1
LO.
H V1 V2 V3 V4 V5 N L/PhV/C
ME. HI.
Window detect
N
L
HIGH

POWER
SUPPLY

AC 230 V 50/60 Hz
AC 230 V
50/60 Hz

N L
VALVE FAN
LOW
C - VALVE
H - VALVE

W - C

230 V
50/60 Hz
power supply
AC motor speeds
AC motor connection
to unit terminal strip.
AC 230 V 50 / 60 Hz
Unit terminal strip.
Valve actuator
phases
AC 230 V 50 / 60 Hz
2P-EC and CO WALL THERMOSTAT
2 PIPES
Live
Neutral
Valve actuator phase
Fan control 0 - 10 V

9 8 7 6 5 4 3 2 1
V- N L/Ph
Window detect
N
L
VALVE
Not used
POWER
SUPPLY
CO SENSOR /

AC 230 V 50/60 Hz AC 230 V
50/60 Hz

N L
VALVEFAN
Not used
0 - 10 V

SENSOR
W - C
CO sensor
230 V
50/60 Hz
power supply
Valve actuator phase.
AC 230 V 50 / 60 Hz
Unit terminal strip.
EC motor control.
AC 230 V 50 / 60 Hz
 
THERMOSTAT V6 EN-12
3 - INSTALLING THE UNIT
4P-EC and CO WALL THERMOSTAT
4 PIPES
Live
Neutral
Cold valve actuator phase
Hot valve actuator phase
Fan control 0 - 10 V

9 8 7 6 5 4 3 2 1
V/CH- N L/Ph
N
L
C - VALVE
H - VALVE
POWER
SUPPLY

AC 230 V 50/60 Hz AC 230 V
50/60 Hz

N L
VALVEFAN
Not used
0 - 10 V

W - C
Not used
Window detect
230 V
50/60 Hz
power supply
Valve actuator
phases.
AC 230 V 50 / 60 Hz
Unit terminal strip.
EC motor control.
AC 230 V 50 / 60 Hz
 

Beware of cable errors. No. 8 is a window switch, only one potential-free (dry) contact can be connected.
EN-13 THERMOSTAT V6
4 - TECHNICAL SPECIFICATIONS
86
65
86
46
60
18 18

60 mm
All dimensions in mm
Power supply 230 V 50/60 Hz Internal sensor NTC 10K, 3950K at 25 °C
Consumption <1 W CO sensor (2P) NTC 10K 3977K at 25 °C
Maximum current for 230 V relays 5 A Temperature measurement range 0~50 °C
Setpoint setting range 5 °C to 35 °C Accuracy ± 1 °C

Maximum cable cross-section 2,5 mm² Relative humidity 85 %
Stripped length 6 mm IP protection IP30
Tightening torque 0,4 N.m Housing ABS, UL94-5
Electrical protection class Class 2 Min./max. cable cross-section 1 - 2,5 mm²
THERMOSTAT V6 EN-14
5 - CONFORMITY

This unit complies with the provisions of the following European
directives:
■
■
■
■

This unit complies with the requirements of:
■
■
■
in Electrical and Electronic Equipment Regulations 2012
■UK REACH Regulations 2019
UK Importer:
■      

6 - TROUBLESHOOTING
Problems Possible solutions
The (2P only) -
-
 -
the parameter menu.
7 - ENVIRONMENTAL PROTECTION

EN-15 THERMOSTAT V6
Carrier S.C.S, Rte de Thil - 01120 Montluel, France. Printed in the European Union.
The manufacturer reserves the right to change the product specications without notice.
The quality management system of the assembly site for this product has been certied as compliant with the requirements of ISO 9001 (latest version) after an audit
conducted by an authorised independent third party.
The environmental management system of the assembly site for this product has been certied as compliant with the requirements of ISO 14001 (latest version) after
an audit by an independent third party.
The occupational health and safety management system of the assembly site for this product has been certied as compliant with the requirements of ISO 45001 (latest
version) after an audit by an independent authorised third party.
Please contact your sales representative for more information.
/