03 02-2020 M.S. A.B. Adding fan motor control 3 mode features
02 07-2019 M.S. A.B. Update and errors revision
01 04-2019 M.S. A.B. Review
00 11-2018 M.S. A.B. First issue
Rev Data Redatto Approvato Note
Catalogo / Catalogue / Katalog / Catalogue MCO01137I0320-03
Serie / Series / Serie / Serie / Série
Fan Coils Regulator (RFC)
INDEX
1 GENERAL INFORMATION... 3
1.1 DESCRIPTION ... 3
1.2 MAINCHARACTERISTICS ... 3
2 INPUTS AND OUTPUTS ... 3
2.1 DIGITALINPUTS ... 4
2.2 ANALOGINPUTS ... 4
2.3 DIGITALANDANALOGINPUTS ... 4
3 0-10V FAN MOTOR OPERATION ... 5
3.1 FANMOTORSPEEDSEQUENCE ... 5
3.2 DESTRATIFICATIONCYCLE ... 7
3.3 TIMEDELAYFORFANMOTORSTARTUP ... 7
4 HOT/COLD OUTPUTS ... 7
ACTUATOR OUTPUT,“ON-OFF” TYPE ... 7
5 MANUAL DECALIBRATION OF THE SET POINT ... 7
6 TYPES OF PLANT SYSTEMS ... 7
7 SUMMER / WINTER OPERAZIONI MODE CHANGE ... 8
8 INSTALLATION ... 8
8.1 INSTALLATIONOFTHEREGULATOR ... 8
8.2 INSTALLATIONON-BOARDFAN-COILUNIT ... 9
8.3 WATERTEMPERATURESENSORMONITORING ... 10
8.3.1 ELECTRICAL CONNECTIONS OF THE REGULATOR ... 10
8.3.2 CONNECTION OF THE ACTUATORS INTO 4-PIPE PLANTS ... 10
8.3.3 CONNECTION OF THE ACTUATOR INTO 2-PIPE PLANTS ... 10
9 DIMENSIONS ... 10
10 ADDRESS SETTING ... 10
10.1 ADDRESSSETTINGFROM10TO31 ... 10
10.2 ADDRESSEXTENSIONABOVE31 ... 11
10.3 STORINGOFIDOFFSETADRESSESBYHI-T2... 12
10.4 EXEMPLE ... 12
11 PARAMETERS OF FANCOIL UNIT ... 13
12 ELECTRICAL CONNECTIONS ... 14
12.1 FANCOILSREGULATORTERMINALBLOCK ... 14
1 GENERAL INFORMATION
The RFC regulator is a microprocessor device designed for regulation of heating/cooling with two-/four-pipe fan coil units, it can ne used exclusively in the systems equipped with Hi-T2 control panel and Air-water-water chillers/Heat Pumps.
It has also the ability to control fancoil units equipped with electric heaters. The fan coil models that can be managed by the regulator (RFC) are as follows:
• VE • HNC • HCNA
1.1 DESCRIPTION
The available proportional + integral action (P + I) allows for precise control of the temperature in all working conditions.
It can be installed on the on the wall or on the fan coil frame, using the optional remote air sensor and a mandatory water sensor. The heating/cooling operating mode can be managed via the Hi-T2 control panel.
The room temperature sensor is located inside the RFC regulator and can be replaced by an optional remote sensor.
1.2 MAIN CHARACTERISTICS
• Applications for 2 or 4-pipe fan coil units
• Digital controller with proportional + integral action • Fan speed control with 0-10V output or a three-speed • Regulating actuators: ON-OFF or PWM
• Output control voltage: actuators for 230 Vac valves, 0-10Vdc or 230Vac fan • Power supply: 230 Vac, 50/60 Hz
• CE Certification
• Communication with Modbus RTU protocol (towards Hi-T2) • NTC water temperature sensor 10K ß3435
• Air temperature sensor (optional) NTC 10K ß3435
2 INPUTS AND OUTPUTS
For the following parameter references, refer to the "Table of fancoil parameters", paragraph 11.
From the Hi-T2 main screen, press two times the lower-right arrow button to enter in the main page of the system.
Fig. 2 Main page of the system From this page, press the following button to access the "Configuration" page of the Hi-T2:
From the configuration page of Hi-T2 control panel, you can access the user menu, service (maintenance) menu or manufacturer menu.
Fig. 3 Schermata configurazioni
You can get access to the maintenance menu by entering the password 413, from which you select the fancoil parameters.
For terminals that are indicated with the letter M, you should refer to chapter 12.1 Terminals of the regulatore (RFC).
2.1 DIGITAL INPUTS
Window contact (M16 terminal)The open contact indicates that the window is closed and the operation is normal. The closed contact indicates the opening of the window and the transition to antifreeze operation.
This causes the valves to close and the fan to stop. The antifreeze protection will be activated, which introduces a a default room setpoint equa to 4°C.
2.2 ANALOG INPUTS
Air temperature sensor, optional (M11 terminal)
If this temperature sensor is normally situated on the fan coil return air, it has priority respecting the the internal temperature sensor of the RFC regulator.
Water temperature sensor, mandatory (M12 terminal)
This sensor is used by default to consent the fan operation (parameter 08 = 2).
With the parameters 12 and 13, you are able to set temperature values for fan motor operation consent.
2.3 DIGITAL AND ANALOG INPUTS
Fan motor:
Fan speed adjustment: 0 - 10Vdc, 1mA proportional output (terminals: M9 and M10).
Hot water valve actuator:
Cold water valve actuator:
230 Vac, 0.8A output, suitable for the control of max 4 thermal actuators, (Terminals M3 and M7).
Setting range 10…30°C
Power supply 230 Vac, 50/60 Hz
Output (heat and cool) On-Off PWM
Fan output M09, M10 Terminals
0..10Vdc Output, 1mA load max 10 kOhm M04, M05, M06 Terminals 230 Vac, max 1,25 A 3 speed output,
Manopole e selettori Fan motor Set point Auto modulating 0-1-2-3 Temperature: 10…30°C 5 position selector knob Analog inputs
Room temperature
(M11 terminal) Return air temp. sensor (remote) NTC 10K Water temperature
(M12 terminal) Contact or contact/immersion sensor NTC 10K
Digital inputs (M16 terminal) Open window
Neutral band Da 0 a 4 °C
Applications 2-pipe fan coil unit 4-pipe fan coil unit
2-pipe fan coil with auxiliary output
Guard Sigle guard
Degree of protection IP30
Working temperature 0…45°C
Storage temperature -10…+50°C
Humidity limitation 20…80% RH (non-condensing)
3 0-10V FAN MOTOR OPERATION
Fan Motor Fan motor output
Cooli ng He ating High speed Med. speed Low speed Room temperature Fig.4 0-10V fan motor operation
Room temperature/fan output graph:
The graph shows how the 0-10V fan output varies as a percentage when the setpoint changes. The fan is ON only when the setpoint is not satisfied in both modes of cooling and and heating.
The fan runs if the thermostat is enabled or if the water temperature sensor detects a value higher than that of setting parameter 14.
The fan is controlled by default via the Hi-T2 control panel (parameter 22 = 2, ie absolute control of fan speed only remotely from
the Master); otherwise, it can be always controlled by Hi-T2 by setting this parameter to be 1 but with the possibility of intervention by mean of RFC regulator bringing the SEL2 to a position other than AUTO.
The RFC can regulate both fan coils with three-speed fan motors and those with 0-10V regulation.
3.1 FAN MOTOR SPEED SEQUENCE
By default, the fan speed is selectable only from the Hi-T2 (parameter 22 = 2).
Fig. 5 Home page
Press the lower-right arrow button, and click on the fancoil image which appears if one unit at least is being connected:
Fig. 6 Fancoil You can enter in the page of fancoil network.
Fig. 6 Fancoil page
By clicking on the settings icon “ ”, it is possible to select the fan motor speed of the fan coil unit: OFF, AUTO, VEL1, VEL2, VEL3.
OFF= fan stops running VEL1=low speed VEL2 = Medium speed VEL3 = High speed
AUTO: the operation of the fan motor depends on: 1. Room temperature value respecting the setpoint.
2. Setting of the parameter 04: the “continuous operation” is the default setting of fan motor: It runs when the setpoint is not fulfilled and also when the setpoint is reached during operation at minimum speed.
0 = FAN MOTOR’S CONTINUOUS OPERATION: the fan motor runs when the setpoint is not reached and even if it’s reached but with the fan at low speed.
3. The value of the parameter 21: Delay for fan deactivation during the winter when the primary resistance is deactivated, by default 60 seconds.
3.2 DESTRATIFICATION CYCLE
When using a remote air temperature sensor and the setpoint values is reached, the fan will run according to the time periods that are set with the parameters 17 and 18, in order to allow the temperature sensor detecting the correct value of the ambient
air temperature.
3.3 TIME DELAY FOR FAN MOTOR START UP
In heating mode, the fan may start after a delay given by the parameter 19, in order to avoid a circulation of cold air before the
heat exchanger warms up.
The time delay for fan start up is reset, if the electric heater is used as the primary output, see selection, parameter 03 = 2.
In cooling mode, if the setpoint is reached, the fan continues to run at minimum speed for 2 minutes and then stops operation.
4 HOT/COLD OUTPUTS
Actuator output, “ON-OFF” type
Setting for actuator output (M7, M8 terminals of the RFC regulator).
With this setting, the control algorithm works on 6 cycles/hour and changes the ON time according to P + I.P.
eg: if the room temperature is at a value corresponding to 50% of the proportional band, setpoint 20°C, proportional band 2°C, room temperature 19°C, the hot water output will be 5 minutes ON and 5 minutes OFF.
By proportional band we mean the difference between the Setpoint and the air temperature values, it is a parameter that can not be modified by Hi-T2 control panel, set by default at 2°C.
5 MANUAL DECALIBRATION OF THE SET POINT
The parameter 01 can be used to adjust the setpoint temperature via Hi-T2 to have a default value of ± n°C:
Setpoint limitations parameter value: 5 = Relative setpoint 0°C 6 = Relative setpoint ±1°C 7 = Relative setpoint ±2°C 8 = Relative setpoint ±3°C 9 = Relative setpoint ±4°C 10 = Relative setpoint ±5°C
The decalibration can be adjusted by SEL2:
Fig. 7 SEL2
By setting the parameter 01 to a fixed value ± n°C, the decalibration cannot occur if the selector is in halfway.
If the cursor is turned complety towards the right side, a decalibration of +n °C occurs respecting the Setpoint value made by the Hi-T2 control panel.
On the other hand, on the left hand side there is a staring of -n ° C from the Hi-T2 Setpoint.
If the cursor is turned complety towards the left side, a decalibration of -n °C occurs respecting the Setpoint value made by the Hi-T2 control panel.
6 TYPES OF PLANT SYSTEMS
In Summer mode of operation and when the air temperature sensor is higher than the setpoint value, the hot water/cold water valve connected to terminal M8 will be activated
An electric heater can be connected to terminal M7 for activation during the Winter mode when the measured temperature by the room temperature sensor is equal to 2°C or when it’s lower than the setpoint value.
Example for Summer mode:
2. Parameter 3 = 1 (4-pipes system)
In Summer mode operation, if the room temperature sensor measures a value higher than the Summer Setpoint this leads to activate the cold water valve M7.
In Winter mode operation, if the room temperature sensor measures a value lower than the Winter Setpoint, the M8 valve will be activated.
In this case of 4-pipe system, it is not possible to manage the resistance in winter operation mode.
7 SUMMER / WINTER OPERAZIONI MODE CHANGE
The Summer/Winter operation mode commutation can be made by mean of the remote control panel Hi-T2, from the Status Setup Menu, System.
8 INSTALLATION
This product must be installed in accordance with local laws and regulations and only by qualified personnel.
8.1 INSTALLATION OF THE REGULATOR
The fancoils system regulator is the temperature control device of a certain environment. The regulator must be installed at about 1.5 meters above the floor, in a position exposed to the circulation of ambient air and must not be influenced by:
• air circulation or dead spots behind doors or in corners, • warm or cold air from air ducts,
0...10V fan motor output Cold water valve
output Terminal (M7)
• solar radiation or radiation produced by other household appliances,
• unwarm or cooled zones, such as external walls located behind the thermostat, • pipes or chimneys integrated into the wall.
1. Use a screwdriver to loosen the locking screw at the bottom of the regulator so that the cover can be removed.
2. Pass the cables through the holes behind the regulator and then fix screws the housing to the wall or on the plate supplied with the fan coil unit.
3. Connect the cables on the terminals respecting the wiring diagram.
4. Replace the cover and secure it by tightening the screw at the bottom of the casing.
Fig.11: Installation of the thermostat
8.2 INSTALLATION ON-BOARD FAN-COIL UNIT
It is possible to install the regulator (RFC) on-board fan coil units only for the vertical models. The reference models are: VMI, VMF, VII, VIF.
Refer to the following images for positioning the bracket:
8.3 WATER TEMPERATURE SENSOR MONITORING
Water temperature sensor for the consent of fan motor: place the sensor inside the heat exchanger coil as shown below
Fig.14: Positioning of the water temperature sensor
8.3.1
ELECTRICAL CONNECTIONS OF THE REGULATOR
The terminals are suitable for cables up to 1,5mm2.
8.3.2
CONNECTION OF THE ACTUATORS INTO 4-PIPE PLANTS
The actuators must be connected to the terminals M8 and M3 (hot water valve actuator) and between M7 and M3 (cold water valve actuator).
8.3.3
CONNECTION OF THE ACTUATOR INTO 2-PIPE PLANTS
The actuator must be connected to the hot water valve outlet, terminals M8 and M3.
9 DIMENSIONS
Fig.15 Dimensions of the RFC thermostat
10 ADDRESS SETTING
10.1 ADDRESS SETTING FROM 10 TO 31
Fig.16: Dipswitch
The wiring with the control panel (Hi-T2) is done trough a cable connected between the terminals A (+) and B (-) of the regulator (RFC) (see the picture above) and the therminals 4 (-) and 5 (+) of the Hi-T2 control panel.
The bus address of the regulator (RFC) is set by mean of the dip switches located on the left side of the regulator. See the above figure.
Do not assign the same address to more than one regulator on the same bus.
For the first 22 fan coils the setting addresses are as follows:
If you have more than 22 fancoil unit in your system, you need to modify the parameter 23 from the fancoil menu (please fefer to the following paragraph).
10.2 ADDRESS EXTENSION ABOVE 31
It is possible to extend the Modbus addresses from 32 to 96 by mean of the remote control panel (Hi-T2) and with the setting of the parameter 23 (Fancoil ID offset).
Fancoil ID offset = 0: fancoil addresses as dipswitch. Fancoil ID Offset = 1
Fancoil address = Setting dipswitch + 32 * (Fancoil ID offset). Example: Dipswitches set for address 5. Address = 5 + (32*1) = 37.
Fancoil ID Offset = 2
Fancoil address = Setting dipswitches + 32 * (Fancoil ID offset). Example: Dipswitches set for address 12. Address = 12 + (32*2) = 76.
10.3 STORING OF ID OFFSET ADRESSES BY HI-T2
It is important to note that, if you need to assign addresses to a fancoil network where it is necessary for the units to have different ID Offest, you must first proceed by using the same ID Offset for the RFC regolators, then power ON them in groups with equal offsets: note that the Hi-T2 control panel will not find the RFC regulators with the same address.
When all the addresses have been assigned, the Hi-T 2 control panel start to scan the network:
From Settings icon > go to Maintainer Menu (password 413), select Address Configuration and then Network Scan. Hi-T 2 will display the Number of Chillers (maximum 7 addresses) and Fancoils (maximum 80 addresses) that are connected.
10.4 EXEMPLE
The following drawing shows the connections between one control panel (Hi-T2) and three regulators (RFC).
The communication is between the terminals (R +) and (R-), and the linear connection (in daisy-chaining) works successfully for a correct communication.
The addresses 10, 11 and 12 have been assigned to the regulators (RFC).
11 PARAMETERS OF FANCOIL UNIT
The parameters listed in the below table can be adjusted by mean of the control panel (Hi-T2) from the Maintenance Menu, Fancoil Parameters.
The following table shows all the parameters that can be set, with range and the default value of each one.
Parameter Description U.M. Range Default
01
Setpoint limitations
Manual adjustment of the setpoint 5 = Relative setpoint 0°C 6 = Relative setpoint ±1°C 7 = Relative setpoint ±2°C 8 = Relative setpoint ±3°C 9 = Setpoint relativo ±4°C 10 = Relative setpoint ±5°C Num 5 , 10 5 02 Neutral Band 0 = Neutral band 4.0°C 1 = Neutral band 3.0°C 2 = Neutral band 2.0°C 3 = Neutral band 1.0°C 4 = Neutral band 0°C Num 0 , 4 2 03
Plant type 0 = 2-pipe plant 1 = 4-pipe plant Num 0 , 1 0
04 Fan motor mode
0 = FAN ALWAYS THERMOSTATED: The fan is ON only if the setpoint is not reached, for both cases heating and cooling modes
1 = FAN’S CONTINUOUS OPERATION: the fan motor is ON when the setpoint is not reached and also even with reached setpoint
but fan motor is in minimum speed
2 = FAN’S CONTINUOUS OPERATION IN SUMMER MODE: OFF in heating, ON in cooling.
3 = FAN’S CONTINUOUS OPERATION ONLY IN WINTER MODE: It is ON in heating, OFF in cooling.
Num 0 , 3 0
05
Actuator type 0 = ON-OFF ACTUATOR Flag / 0
06
Window contact type 0 = ACTIVE IN CLOSED STATUS 1 = ACTIVE IN OPEN STATUS Flag 0 , 1 0
07
Reduction Set in Eco
0 = 2°C 1 = 4°C 2 = 6°C 3 = 8°C 4 = 10°C Num 0 , 4 2 08
Water sensor water sensor function
0 = Summer/Winter commutation + Consenst of fan motor 1 = Summer/Winter commutation
2 = Winter fan consent 3 = Temperature reading only
Num 0, 3 2 10 Temperature Offset 0 = Offset 0.0 °C 1 = Offset + 1.0 °C 2 = Offset - 1.0 °C 3 = Offset + 2.0 °C 4 = Offset - 2.0 °C Num 0 , 4 0 11
Primary E-heater fan speed Primary electric heater fan speed Volt 0 - 10 5.0
12
Winter consent temp. Threshold above which the consent of the fan motor is enabled in Winter mode °C 0 - 50 35 13
Summer consent temp. Threshold above which the consent of the fan motor is enabled in Summer mode °C 0 - 25 25 14
Set antigelo Winter antifreeze temperature °C 0 - 10 4
15
Auxiliary output deviation To set the temperature difference value with respect to the set point for activation of the auxiliary output °C 0 - 10 0.5 17
19
Winter Fan Delay after v Fan motor time delay to start in Winter mode with respect to the opening of the hoty water valve Seconds 0 - 250 60 20
Winter Fan Delay after r Start-up delay of the fan in Winter mode respecting the activation of the primary E-heater output. Seconds 0 - 250 60 21
Postventilation Fan motor time delay to stop in Winter mode when the primary ecectric heater becomes off Seconds 0 - 250 60 22
Fan motor control mode
1 = Remote functionality from Hi-T2 control panel and with possible action from RFC regulator.
2 = Absolute functionality only from Hi-T2 controller
3 = functionality as 1 if zone is ON, otherwise constraints to OFF
Num 1 , 2 2
23
Offset ID fancoil Allows to have network addresses for more than 22 units Num 0 , 2 0
12 ELECTRICAL CONNECTIONS
12.1 FAN COILS REGULATOR TERMINAL BLOCK
Twist off the screw situated at the back cover of the regulator (RFC), then remove the upper cover in order to get access to the terminal block:
TERMINAL CONNECTION
M1 POWER SUPPLY (PHASE)
M2 POWER SUPPLY (NEUTRAL)
M3 NEUTRAL FOR OUTPUTS (LOADS)
M4 LOW SPEED
M5 MEDIUM SPEED
M6 HIGH SPEED
M7 ACTUATOR’S OUTPUT/COLD WATER VALVE
M8 ACTUATOR’S OUTPUT/HOT WATER VALVE
M9 0-10V FAN MOTOR OUTPUT
M10 0-10V FAN MOTOR OUTPUT
M11 REMOTE ROOM TEMPERATURE SENSOR (OPTIONAL)
M12 WATER TEMPERATURE SENSOR INPUT
M13 COMUN FOR ANALOG/DIGITAL INPUTS
M16 WINDOW CONTACT INPUT
A R+
