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iSMA CONTROLLI RAC18-IP User Manual

Universal fcu application
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RAC18-IP
User Manual
Universal FCU Application
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DMP299en | 1st Issue rev. 1 | 01/2025

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Summary of Contents for iSMA CONTROLLI RAC18-IP

  • Page 1 RAC18-IP User Manual Universal FCU Application www.ismacontrolli.com DMP299en | 1st Issue rev. 1 | 01/2025...

  • Page 2: Table Of Contents

    Universal FCU Application User Manual Table of Contents Introduction ........................... 5 Revision History..........................6 Inputs and Outputs......................7 Universal Inputs ..........................7 Digital Inputs..........................7 Triac Outputs ..........................8 Digital Outputs ..........................9 2.4.1 Fan Outputs ..........................9 2.4.2 Electrical Heater (O4)......................10 2.4.3 Electrical Cooler (O5) ......................
  • Page 3 4.3.4 Supply Air Temperature Limitation .................. 36 4.3.5 FCU Test Mode........................37 4.3.6 FCU Controller Outputs Manual Override..............37 RAC18-IP Panel Connection and Configuration ............39 Touch Point ..........................40 Control Point..........................41 LP Panel ............................42 SP Panel ............................43 FP Panel ............................44 BACnet IP Client-Server Configuration ................45 MAC Addressing and ID ......................45...
  • Page 4 Universal FCU Application User Manual 7.2.3 4-pipe Installation with 1-stage Digital Controlled Heating and Cooling and 2- speed Fan ..........................51 7.2.4 4-pipe Installation with 1-stage Digital Controlled Heating and Cooling and 3- speed Fan ..........................51 7.2.5 4-pipe Installation with 1-stage Analog Controlled Heating and Cooling and Analog Controlled Fan ......................

  • Page 5: Introduction

    Universal FCU Application User Manual 1 Introduction This user manual outlines the configuration steps of the universal FCU application designed for the RAC18-IP controller. The application is based on the nano EDGE ENGINE components and is fit for most types of fan coil units. ...

  • Page 6: Revision History

    Universal FCU Application User Manual 1.1 Revision History Date Rev. Description 30 Jan 2025 Control Point support 20 Jun 2024 First edition Table 1. Revision history www.ismacontrolli.com DMP299en | 1st Issue rev. 1 | 01/2025 page 6 of 76...

  • Page 7: Inputs And Outputs

    Figure 2. Universal inputs connection 2.2 Digital Inputs The RAC18-IP device is equipped with four digital inputs. The way of connecting all signals to the inputs is presented in the figure below. Digital inputs I1 to I3 can be inverted, depending on the type of sensors connected to the device.

  • Page 8: Triac Outputs

    Figure 3. Digital inputs connection 2.3 Triac Outputs The RAC18-IP device has two triac outputs to connect the actuators of heating and cooling valves. Both can work as typical binary outputs (for binary temperature control) or with the PWM. In the PWM mode, the output works in the period when two states are used (low state 0 V and high 230 V AC).

  • Page 9: Digital Outputs

    2.4 Digital Outputs 2.4.1 Fan Outputs The RAC18-IP device is equipped with three relay outputs designed for connecting with the fan. The way of connecting the fan (depending on the number of speeds) is presented in the figure below. These outputs have internal connection to the power supply terminal and are protected by a built-in 6 A fuse.

  • Page 10: Electrical Heater (O4)

    Universal FCU Application User Manual Figure 5. Fan connections 2.4.2 Electrical Heater (O4) The RAC18-IP device is equipped with a relay output for connecting the electrical heater. This output can be used for 1 or 2 stage heating, depending on the S3 DIP switch configuration.

  • Page 11: Electrical Cooler (O5)

    Universal FCU Application User Manual Figure 6. Electrical heater connections 2.4.3 Electrical Cooler (O5) The RAC18-IP device is equipped with a relay output for connecting the electrical cooler. This output can be used as 1 or 2 stage cooling, depending on the S3 DIP switch configuration.

  • Page 12: Analog Outputs

    Universal FCU Application User Manual Figure 7. Electrical cooler connection 2.5 Analog Outputs The RAC18-IP device has 3 analog outputs 0-10 V DC, which can be used for controlling the following fan coil unit devices: • A1, analog heating valve actuator control;...
  • Page 13 Universal FCU Application User Manual Figure 8. Connection of analog valve actuators www.ismacontrolli.com DMP299en | 1st Issue rev. 1 | 01/2025 page 13 of 76...

  • Page 14: Simple Panel Connection

    (NO, max. 50 mA); • LED diode (blue, max. 5 mA). The iSMA-B-SP panel internal connection and the connection with the RAC18-IP controller are presented in the figures below. www.ismacontrolli.com DMP299en | 1st Issue rev. 1 | 01/2025...
  • Page 15 Universal FCU Application User Manual Figure 10. Diagram of internal connections of the simple panel Figure 11. Connection diagram of the iSMA-B-FCU controller www.ismacontrolli.com DMP299en | 1st Issue rev. 1 | 01/2025 page 15 of 76...

  • Page 16: Dip Switch Configuration

    Figure 12. RAC18-IP controller The S3 DIP switch is responsible for configuring the application. The configuration of the RAC18-IP controller with the universal FCU application is described step by step in the section of the manual: Step 1: selecting the FCU pipe type;...

  • Page 17: Step 1: Choosing The Fcu Pipe Type

    3.2 Step 1: Choosing the FCU Pipe Type The RAC18-IP can be used in 4-pipe installations as well as in 2-pipe installations. In order for the controller to operate correctly in the application, it is necessary to know the fan coil pipe type and set the S3 DIP switch to the corresponding settings as described below.

  • Page 18: 2-Pipe Only Heating Or Only Cooling

    Universal FCU Application User Manual Figure 13. RAC18-IP controller 3.2.2 2-Pipe Only Heating or Only Cooling www.ismacontrolli.com DMP299en | 1st Issue rev. 1 | 01/2025 page 18 of 76...

  • Page 19: Step 2: Switching Between 1 Heating Stage And 2 Heating Stages Modes

    Universal FCU Application User Manual Figure 14. 2-pipe FCU installation For connection details go to steps 4, 5, and 6. 3.3 Step 2: Switching Between 1 Heating Stage and 2 Heating Stages Modes The fan coil unit can operate with one heating device or with two heating devices. It is configured with the 2 section of the S3 DIP switch.

  • Page 20: Stages Of Heating In 4-Pipe Fan Coil Unit

    Universal FCU Application User Manual 3.3.1 2 Stages of Heating in 4-Pipe Fan Coil Unit Figure 15. 2 stages of heating in 4-pipe FCU installation 3.4 Step 3: Switching Between 1 Cooling Stage and 2 Cooling Stages Modes The fan coil unit can operate with one cooling device or with two cooling devices. It is configured with the 3 DIP switch S3.

  • Page 21: Step 4: Selecting Type Of Control Required By The Fcu Valves And Connection Details

    Universal FCU Application User Manual Figure 16. 2 stages of cooling in 2-pipe FCU installation 3.5 Step 4: Selecting Type of Control Required by the FCU Valves and Connection Details The controller’s outputs can operate in digital or analog mode. Depending on the fan coil unit actuators control type, the corresponding DIP switch has to be set to a desired position.

  • Page 22: Step 5: Selecting The Temperature Control Value Source And Its Connection Details

    Universal FCU Application User Manual Figure 17. Heating actuators connection The figure below pictures the connection of cooling actuators: • A1 for analog 0-10 V control while operating in 2-pipe mode; • A2 for analog 0-10 V control while operating in 4-pipe mode; •...

  • Page 23: Temperature Source: Touch Point/Control Point/Lp/Fp Room Panel

    Universal FCU Application User Manual Figure 19. RAC18-IP connectors 3.6.1 Temperature Source: Touch Point/Control Point/LP/FP Room Panel Figure 20. LP/FP/Touch Point/Control Point room panel set as a temperature source 3.6.2 Temperature Source Connected to U3 Figure 21. Temperature sensor connected to S3 as a temperature control value source www.ismacontrolli.com...

  • Page 24: Temperature Source Connected To U1

    Figure 23. Temperature control value source set to the Ethernet network 3.7 Step 6: Selecting Type of Fan Used Within the Project and its Connection Details There are many fan types the RAC18-IP supports, and it can be configured for the fan coil unit used in the project. www.ismacontrolli.com DMP299en | 1st Issue rev.

  • Page 25: Analog Controlled Fan Connection

    Universal FCU Application User Manual 3.7.1 Analog Controlled Fan Connection Figure 24. Analog controlled fan connection 3.7.2 1-speed Fan Connection www.ismacontrolli.com DMP299en | 1st Issue rev. 1 | 01/2025 page 25 of 76...

  • Page 26: 2-Speed Fan Connection

    Universal FCU Application User Manual Figure 25. 1-speed fan connection 3.7.3 2-speed Fan Connection www.ismacontrolli.com DMP299en | 1st Issue rev. 1 | 01/2025 page 26 of 76...

  • Page 27: 3-Speed Fan Connection

    Universal FCU Application User Manual Figure 26. 2-speed fan connection 3.7.4 3-speed Fan Connection www.ismacontrolli.com DMP299en | 1st Issue rev. 1 | 01/2025 page 27 of 76...
  • Page 28 Universal FCU Application User Manual Figure 27. 3-speed fan connection www.ismacontrolli.com DMP299en | 1st Issue rev. 1 | 01/2025 page 28 of 76...

  • Page 29: Control Algorithm

    Universal FCU Application User Manual 4 Control Algorithm The default application has been designed to service a wide range of typical fan coil units. The application allows to work with typical fan coil units equipped with heating and/or cooling devices and wide range of fans. The main function of the default application is designed to control room temperature.

  • Page 30: Unoccupied Mode

    Universal FCU Application User Manual Occupied Effective Setpoint The Effective Setpoint is calculated based on 2 parameters, Setpoint and Offset. The Setpoint parameter defines real user room temperature value. The Setpoint Offset parameter defines the value, which user can add or subtract to the setpoint. The Offset range is limited by the Offset_Range network variable, by default to 3, therefore the user can add or subtract max.

  • Page 31: Standby Mode

    Universal FCU Application User Manual Occupied Heating / Cooling FCU Mode Switching In this mode (if the FCU_Mode network variable is set in Auto), the application remains in the last running mode (heating or cooling) in the occupied mode. The control algorithm does not change and depends of the CFG DIP switch configuration.

  • Page 32: Forced Occupied

    Universal FCU Application User Manual 4.1.4 Forced Occupied This mode is called by external devices connected to FCU digital inputs or from the room panel. This mode operates for the time defined in network parameters. The Forced Occupied behavior is the same as the occupied mode. Switching to Forced Occupancy Mode by Occupancy Button I1 The I1 digital input is dedicated to connect presence button or sensor, which remotely runs the forced occupancy mode.

  • Page 33: Fcu Modes

    Universal FCU Application User Manual in the forced occupied mode, and the user cannot switch it off before the time elapses. After defined time elapsed, the application returns to the previous mode, unoccupied or standby. By changing the I2_Presence_Sensor_Invert network variable the application can be connected to the devices with normal open NO or normal close NC outputs.

  • Page 34: Off Mode

    Universal FCU Application User Manual • Cooling Only: in this mode, the FCU controller can perform only cooling function (dedicated for 2-pipe mode or if the heating medium is not available: summer mode); • Fan Only: in this mode, the FCU controller can perform only ventilation, heating and cooling functions are disabled.

  • Page 35: Heating Only Mode

    Universal FCU Application User Manual Figure 30. Switching between heating/cooling chart 4.2.3 Heating Only Mode In the Heating Only mode, the application is running only with the heating algorithm. The fan outputs, heating valve actuator outputs, and HTG relay are enabled, while the cooling valve actuator outputs and CLG relay are disabled.

  • Page 36: Anti-Frost Protection

    Universal FCU Application User Manual I3_Window_Contact_Invert network variable, the application can be connected to the devices with normal open NO or normal close NC outputs. 4.3.2 Anti-frost Protection This function is designed to protect room equipment, which can be damaged in low temperatures.

  • Page 37: Fcu Test Mode

    Universal FCU Application User Manual temperature value returns to the comfort range, the FCU application resets the delay counter, enables the 2 stage, and returns to normal operation. Supply Air Temperature limitation in the 1 stage, analog control In the analog control, if the supply air temperature approaches 1°C to the comfort range limit, the FCU application starts a built-in algorithm, which reduces the air temperature (if the temperature value is close or above the SupplyTemperatureHighLimit) or increase the temperature...
  • Page 38 Universal FCU Application User Manual second–for the switch between auto and manual control. The control value depends on the output working mode. In the analog control mode, network parameters are working in the range from 0 to 100%. In the binary control mode, the fan works in the range from 0 to 3 and valve actuators outputs (triacs) work in the range from 0 to 1.

  • Page 39: Rac18-Ip Panel Connection And Configuration

    Universal FCU Application User Manual 5 RAC18-IP Panel Connection and Configuration The RAC18-IP controller works with three types of dedicated panels: • Touch Point panel; • Control Point panel; • LP panel with LCD display; • SP panel without display, fully passive;...

  • Page 40: Touch Point

    S3 DIP switches number 5 and 6, according to the table above. Using the Touch Point panel, the user can set and display many RAC18-IP controller’s parameters, such as fan speed, setpoint, offset, occupancy status, etc. If using the Touch Point device, the configuration and user parameters are synchronized with the BMS, the last change from the BMS or panel is the most current.

  • Page 41: Control Point

    S3 DIP switches number 5 and 6, according to the table above. Using the Control Point panel, the user can set and display many RAC18-IP controller’s parameters, such as fan speed, setpoint, offset, occupancy status, etc. If using the Control Point device, the configuration and user parameters are synchronized with the BMS, the last change from the BMS or panel is the most current.

  • Page 42: Lp Panel

    Universal FCU Application User Manual 5.3 LP Panel The LP room panel is connected to the RAC18-IP controller’s RJ45 socket. This connection provides panel power supply and communication. If the room panel is connected, the user can decide, which temperature sensor to control the algorithm, from the panel or from universal input.

  • Page 43: Sp Panel

    U3 input. The sensor is chosen by the S3 DIP switches number 5 and 6, in accordance with the table above. If using the simple panel, the RAC18-IP controller works as an external sensor connected directly to the U3 input (switches number 5 off and 6 on). The temperature effective setpoint is set by changing the Setpoint_Offset value.

  • Page 44: Fp Panel

    S3 DIP switches number 5 and 6, according to the table above. Using the FP panel, the user can set and display many RAC18-IP controller parameters, such as fan speed, setpoint, offset, occupancy status, etc. If using the FP device, the configuration and user parameters are synchronized with the BMS, the last change from the BMS or panel is the most current.

  • Page 45: Bacnet Ip Client-Server Configuration

    Universal FCU Application User Manual 6 BACnet IP Client-Server Configuration The RAC18-IP controller can work in networks, where one device is a client device and the remaining devices are server devices. This function is useful if there are more than one devices working in a single room.

  • Page 46: Master-Slave Sharing Parameters

    Universal FCU Application User Manual Master Id Slave 1 ID Slave 2 ID Slave 3 ID Slave 4 ID Slave 5 ID 826113 826061 826062 826063 826064 826065 826114 826066 826067 826068 826069 826070 826115 826071 826072 826073 826074 826075 826116 826076 826077...

  • Page 47: Application Status

    Universal FCU Application User Manual • Setpoint: the setpoint for slave devices, based on the master device’s setpoint and the Setpoint_Offset value. This parameter does not include the Unoccupied_Offset and Standby_Offset, Effective Setpoint is calculated in the slave device according to the FCU mode;...
  • Page 48 Universal FCU Application User Manual property 5002. This network variable allows to understand, what is causing a problem if the application is not working, or which fault it has gone into. It also shows transitional states such as yield, restart, and hibernate. www.ismacontrolli.com DMP299en | 1st Issue rev.

  • Page 49: Examples: Connecting Actuators And Sensors To The Controller

    Universal FCU Application User Manual 7 Examples: Connecting Actuators and Sensors to the Controller 7.1 Connections Overview Figure 36. Inputs and outputs overview 7.2 Connection Examples The examples below do not include selection of the temperature control value source. Connecting the temperature control value source is described in Step 7 of this manual. In examples, DIP switch sections 5 and 6 are set to OFF.

  • Page 50: 4-Pipe Installation With 1-Stage Digital Controlled Heating And Cooling And 1-Speed Fan

    Universal FCU Application User Manual Figure 37. 4-pipe installation with 1-stage digital controlled heating and cooling and analog controlled fan 7.2.2 4-pipe Installation with 1-stage Digital Controlled Heating and Cooling and 1-speed Fan Figure 38. 4-pipe installation with 1-stage digital controlled heating and cooling and 1-speed fan www.ismacontrolli.com DMP299en | 1st Issue rev.

  • Page 51: 4-Pipe Installation With 1-Stage Digital Controlled Heating And Cooling And 2-Speed Fan

    Universal FCU Application User Manual 7.2.3 4-pipe Installation with 1-stage Digital Controlled Heating and Cooling and 2-speed Fan Figure 39. 4-pipe installation with 1-stage digital controlled heating and cooling and 2-speed fan 7.2.4 4-pipe Installation with 1-stage Digital Controlled Heating and Cooling and 3-speed Fan www.ismacontrolli.com DMP299en | 1st Issue rev.

  • Page 52: 4-Pipe Installation With 1-Stage Analog Controlled Heating And Cooling And Analog Controlled Fan

    Universal FCU Application User Manual Figure 40. 4-pipe installation with 1-stage digital controlled heating and cooling and 3-speed fan 7.2.5 4-pipe Installation with 1-stage Analog Controlled Heating and Cooling and Analog Controlled Fan Figure 41. 4-pipe installation with 1-stage analog controlled heating and cooling and analog controlled fan - valve in analog mode www.ismacontrolli.com DMP299en | 1st Issue rev.

  • Page 53: 4-Pipe Installation With 1-Stage Analog Controlled Heating And Cooling And 1-Speed Fan

    Universal FCU Application User Manual Figure 42. 4-pipe installation with 1-stage analog controlled heating and cooling and analog controlled fan - valve in PWM mode 7.2.6 4-pipe Installation with 1-stage Analog Controlled Heating and Cooling and 1-speed Fan Figure 43. 4-pipe installation with 1-stage analog controlled heating and cooling and 1-speed fan - valve in analog mode www.ismacontrolli.com DMP299en | 1st Issue rev.

  • Page 54: 4-Pipe Installation With 1-Stage Analog Controlled Heating And Cooling And 2-Speed Fan

    Universal FCU Application User Manual Figure 44. 4-pipe installation with 1-stage analog controlled heating and cooling and 1-speed fan - valve in PWM mode 7.2.7 4-pipe Installation with 1-stage Analog Controlled Heating and Cooling and 2-speed Fan Figure 45. 4-pipe installation with 1-stage analog controlled heating and cooling and 2-speed fan - valve in analog mode www.ismacontrolli.com DMP299en | 1st Issue rev.

  • Page 55: 4-Pipe Installation With 1-Stage Analog Controlled Heating And Cooling And 3-Speed Fan

    Universal FCU Application User Manual Figure 46. 4-pipe installation with 1-stage analog controlled heating and cooling and 2-speed fan - valve in PWM mode 7.2.8 4-pipe Installation with 1-stage Analog Controlled Heating and Cooling and 3-speed Fan Figure 47. 4-pipe installation with 1-stage analog controlled heating and cooling and 3-speed fan - valve in analog mode www.ismacontrolli.com DMP299en | 1st Issue rev.

  • Page 56: 2-Pipe Installation With 1-Stage Digital Controlled Cooling And Analog Controlled Fan

    Universal FCU Application User Manual Figure 48. 4-pipe installation with 1-stage analog controlled heating and cooling and 3-speed fan - valve in PWM mode 7.2.9 2-pipe Installation with 1-stage Digital Controlled Cooling and Analog Controlled Fan Figure 49. 2-pipe installation with 1-stage digital controlled cooling and analog controlled fan www.ismacontrolli.com DMP299en | 1st Issue rev.

  • Page 57: 2-Pipe Installation With 1-Stage Digital Controlled Heating And 1-Speed Fan

    Universal FCU Application User Manual 7.2.10 2-pipe Installation with 1-stage Digital Controlled Heating and 1-speed Fan Figure 50. 2-pipe installation with 1-stage digital controlled heating and 1-speed fan 7.2.11 2-pipe Installation with 1-stage Digital Controlled Cooling and 2-speed Fan www.ismacontrolli.com DMP299en | 1st Issue rev.

  • Page 58: 2-Pipe Installation With 1 Stage Digital Controlled Heating And 3 Speeds Fan

    Universal FCU Application User Manual Figure 51. 2-pipe installation with 1-stage digital controlled cooling and 2-speed fan 7.2.12 2-Pipe Installation with 1 Stage Digital Controlled Heating and 3 Speeds Fan Figure 52. 2-pipe installation with 1-stage digital controlled heating and 3-speed fan www.ismacontrolli.com DMP299en | 1st Issue rev.

  • Page 59: 2-Pipe Installation With 1-Stage Analog Controlled Cooling And Analog Controlled Fan

    Universal FCU Application User Manual 7.2.13 2-pipe Installation with 1-stage Analog Controlled Cooling and Analog Controlled Fan Figure 53. 2-pipe installation with 1-stage analog controlled cooling and analog controlled fan - valve in analog mode Figure 54. 2-pipe installation with 1-stage analog controlled cooling and analog controlled fan - valve in PWM mode www.ismacontrolli.com DMP299en | 1st Issue rev.

  • Page 60: 2-Pipe Installation With 1-Stage Analog Controlled Heating And 1-Speed Fan

    Universal FCU Application User Manual 7.2.14 2-pipe Installation with 1-stage Analog Controlled Heating and 1-speed Fan Figure 55. 2-pipe installation with 1-stage analog controlled heating and 1-speed fan - valve in analog mode Figure 56. 2-pipe installation with 1-stage analog controlled heating and 1-speed fan - valve in PWM mode www.ismacontrolli.com DMP299en | 1st Issue rev.

  • Page 61: 2-Pipe Installation With 1-Stage Analog Controlled Cooling And 2-Speed Fan

    Universal FCU Application User Manual 7.2.15 2-pipe Installation with 1-stage Analog Controlled Cooling and 2-speed Fan Figure 57. 2-pipe installation with 1-stage analog controlled cooling and 2-speed fan - valve in analog mode Figure 58. 2-pipe installation with 1-stage analog controlled cooling and 2-speed fan - valve in PWM mode www.ismacontrolli.com DMP299en | 1st Issue rev.

  • Page 62: 2-Pipe Installation With 1-Stage Analog Controlled Heating And 3-Speed Fan

    Universal FCU Application User Manual 7.2.16 2-pipe Installation with 1-stage Analog Controlled Heating and 3-speed Fan Figure 59. 2-pipe installation with 1-stage analog controlled heating and 3-speed fan - valve in analog mode Figure 60. 2-pipe installation with 1-stage analog controlled heating and 3-speed fan - valve in PWM mode www.ismacontrolli.com DMP299en | 1st Issue rev.

  • Page 63: Network Variables

    Universal FCU Application User Manual 8 Network Variables 8.1 FCU BACnet AnalogValues and Modbus Registers Name Modb Description ault Addr Valu App_status Devic 65535 – Initialization, 0 – OK, Prop 1 – Malloc image, erty 2 – Malloc stack 5002 3 –...
  • Page 64 Universal FCU Application User Manual Name Modb Description ault Addr Valu writ 2 – Standby mode Setpoint °C User setpoint temperature value writ Setpoint_Offset °C User setpoint offset temperature value writ Fan_Mode 0 - Off 1 - Speed 1 (Manual) writ 2 - Speed 2 (Manual) 3 - Speed 3 (Manual)
  • Page 65 Universal FCU Application User Manual Name Modb Description ault Addr Valu Occupancy_Time_ Forced Occupied mode time value for occupancy button Remote_Trigger I1 and room panel writ Occupancy_Time_ Forced Occupied mode time value for occupancy Presence_Sensor presence sensor I2 writ PWM_Heating_Per PWM time period for heating valve actuator writ PWM_Cooling_Per...
  • Page 66 Universal FCU Application User Manual Name Modb Description ault Addr Valu writ PI regulator parameter Proportional gain writ PI regulator parameter Integral time writ Heating_Binary °C stage heating thermostat differential value _Diff writ Cooling_Binary_Di °C stage cooling thermostat differential value writ Second_Stage_Thr °C...
  • Page 67 Universal FCU Application User Manual Name Modb Description ault Addr Valu Supply_Limits_Tim Time value used in supply air temperature limitation function writ Window_Status_D Time value for open window function elay writ Return_To_Space_ Time value for return temperature sensor control Time function writ FCU_Test_Mode...
  • Page 68 Universal FCU Application User Manual Name Modb Description ault Addr Valu 6 – sensor type 3K3A1 NTC 7 – sensor type 30K6A1 NTC 8 – sensor type SIE1 NTC 9 – sensor type TAC1 NTC 10 – sensor type SAT1 NTC S2_Sensor_Type writ S3_Sensor_Type...
  • Page 69 Universal FCU Application User Manual Name Modb Description ault Addr Valu Remote_Slave1_D BACnet slave device ID number evice_ID writ Note: In Modbus protocol this is 32nd bits register Remote_Slave2_D evice_ID writ Remote_Slave3_D evice_ID writ Remote_Slave4_D evice_ID writ Remote_Slave5_D evice_ID writ Slaves_Ping_Frequ Salves ping frequency value ency...
  • Page 70 Universal FCU Application User Manual Name Modb Description ault Addr Valu 2 – Speed 2, 3 – Speed 3. °C Temperature control value Dip_Switch_Config Current CFG DIP switch bits status uration App_version Application version parameter Heating_Valve Heating analog output or triac PWM value Coolling_Valve Cooling analog output or triac PWM value Fan Value...

  • Page 71: Fcu Bacnet Binaryvalues And Modbus Coils

    Universal FCU Application User Manual Name Modb Description ault Addr Valu LCD Panel Room panel iSMA-B-LP/Touch Point Humidity Humidity value LCD Panel CO2 Room panel iSMA-B-LP/Touch Point value VALID_FRAMES_F Prop The property contains the number of valid frames on OR_US_CNT erty the BACnet MS/TP layer addressed to the controller.
  • Page 72 Universal FCU Application User Manual Name Modbu Defa Description Addres Valu Return_To_Space_E False nable write HTG Relay Enable True True – enable, false – disable O4 relay working write CLG Relay Enable True True – enable, false – disable O5 relay working write I1_Remote_Occ_Trig False...
  • Page 73 Universal FCU Application User Manual Name Modbu Defa Description Addres Valu LCD Temperature True Enable/Disable room panel current temperature display Active write LCD Setpoint Active True Enable/Disable room panel setpoint temperature display write LCD Setpoint True Enable/Disable room panel setpoint edit Editable write LCD Setpoint Fast...
  • Page 74 Universal FCU Application User Manual Name Modbu Defa Description Addres Valu CLG_Relay_Manual_ False CLG Relay state in manual override State write Occupied Forced ,264 Forced Occupied mode status only Heating_Second_Sta Heating in second stage current status only Cooling_Second_Sta Heating in second stage current status only I1_Remote_Occuapa Digital input current status...
  • Page 75 Universal FCU Application User Manual Name Modbu Defa Description Addres Valu Slave1_Window_Stat Window status I3 input read from slave device only Slave2_Window_Stat only Slave3_Window_Stat only Slave4_Window_Stat only Slave5_Window_Stat only Table 13. FCU BACnet BinaryValues and Modbus coils www.ismacontrolli.com DMP299en | 1st Issue rev. 1 | 01/2025 page 75 of 76...

  • Page 76: Disclaimer

    The Universal FCU Application is provided without any guarantees or warranties of any kind. Users are advised to thoroughly test the application in their specific systems and environments before full deployment. iSMA CONTROLLI S.p.A. will not be liable for any direct, indirect, incidental, or consequential damages resulting from the application’s use together with the expenses for repairs, replacements, project handover delay penalties, and any other costs that might arise.