Page 1 Controller manual Service 17-01-2025 Series: Beta Series Zeta Series Tetris Series Titan Series Tetris Rev W LC Tetris Rev W LC/HP...
Page 2 Page intentionally blank Translation from original instructions We reserve the right to make changes without any prior notice.
Page 3 Operating mode 1 2.4.3 Operating mode 2 2.4.4 Operating mode 3 2.4.5 Operating mode 4 2.4.6 References on user interface Swegon Inside Thermoregulation 2.6.1 Proportional inlet control 2.6.2 Outlet control with neutral zone and PID Time bands 2.7.1 General 2.7.2 Time band-based switch-off 2.7.3...
Page 4 Circuits and compressors 2.9.1 Starting and stopping of the compressors 2.9.2 Activation of the compressors between the circuits 2.9.3 Balance sequence criteria 2.9.4 Saturation sequence criteria 2.9.5 Capacity balancing principle 2.9.6 Capacity saturation principle 2.9.7 Management of compressor with inverter 2.9.8 Thermoregulation of units with inverter 2.10...
Page 5 2.20 Refrigerant leak detector management 2.20.1 Function management 2.20.2 Password-protected counter reset 2.21 Refrigerant leak detection management 2.21.1 Stop due to refrigerant leak 2.21.2 Refrigerant leak warning 2.21.3 Refrigerant leak alarms 2.22 Free Cooling 2.22.1 Free cooling with air/water coil 2.22.2 Thermoregulation with the free cooling function 2.22.3...
Page 6 2.29.1 Display and keypad 2.29.2 Displayed parameters 2.29.3 Managed errors/alarms 2.29.4 References on the controller of the unit 2.30 Flowzer 2.30.1 General 2.30.2 “VP” function 2.30.3 “DT” function 2.30.4 “VDE” function 2.30.5 “VD” function 2.30.6 “VFPP” function 2.30.7 “VPS” function 2.31 SMART Link 2.31.1...
Page 7 3.3.3 Recovery alarms 3.3.4 Pump down alarms 3.3.5 Refrigerant leak alarms 3.3.6 Alarms concerning refrigerant leak detector sensor maintenance 3.3.7 Free cooling alarms 3.3.8 Defrost alarms 3.3.9 Fast Restart alarms 3.3.10 “ACS” alarms 3.3.11 Alarms relating to 2-zone function (GIT option) 3.3.12 Tank thermoregulation alarms (TSS option) 3.3.13...
Page 8 Where to find the controller “MAC address” 4.12 Swegon Inside 4.12.1 The unit can be connected to Swegon INSIDE. 4.12.2 How to access the Swegon INSIDE screens in the unit 4.12.3 How to enable/disable Swegon INSIDE 4.12.4 How to view the certificate expiry date 4.12.5 Validity of ID certificate for connection to Swegon INSIDE 4.12.6...
Page 9 INTRODUCTION 1.1 General Some information on the use of this manual. 1.1.1 Purpose of the manual The purpose of this manual is to provide all information regarding the software functions of the controller for the units listed on the cover and it is complementary to the controller installation and programming manual. This manual is the “SERVICE”...
Page 10 Some products will come with a valid certificate out of the factory, while other products need to be equipped with a certificate to authorize the product to share data. To find out if the product is INSIDE Ready (i.e. ready to share data) or not visit INSIDE Ready | www.swegon.com. 1.2.4.5 Safety The Swegon INSIDE product is connected to azure IoT Hub.
Page 11 1.2.4.6 Firewall settings for Swegon Cloud Swegon cloud solution is using Microsoft Azure services and certificates from DigiCert to secure the connection. If the firewall in front of the products is allowing outbound traffic to internet it will work. If the firewall is set up to control outbound traffic the following ports and destinations must be allowed.
Page 12 1.3 "Service" branch In the “Service” branch, which is password-protected, access is gained to loops of screens are accessed for programming and managing the controller and the various functions present in the unit. Login using personal credentials is necessary to browse password-protected menus. After login, it is possible to gain ac- cess to a protected menu for the following thirty minutes without having to enter the password again.
Page 13 1.3.1 Programming the Parameters After selecting icon and on confirming with button ENTER you will access a set of branches of screens for setting the parameters that regard the functions of the unit. With buttons you can scroll the individual branches, with buttons you can go to the next or previous screen of the same branch.
Page 14 1.3.2 Compressors After selecting icon and on confirming with button ENTER you will access the screens that allow you to activate and deactivate the individual compressors and reset the number of hours of operation and the number of starts. In each screen, with buttons you can go to the next or previous screen of the same loop.
Page 15 1.3.5 "Control panel" After selecting icon and on confirming with button ENTER you will access the "Control panel" screen in which there are controls for managing the programming files and the settings of the serial communication of the controller. The functions of this branch are described in the "Control panel" chapter regarding installation of the software. 1.3.6 Status of inputs and outputs After selecting icon...
Page 16 1.3.6.3 "Digital outputs" In this set of screens, you can see the status of the digital outputs. The first screen shows the outputs of the Master board. With buttons you will access the screens where the digital outputs of the expansion boards are shown. For each output, there may be: - "ON", if the output is closed;...
Page 17 SOFTWARE FUNCTIONS For management of the units, special software is loaded into the controller. The software consists of a combination of functions dedicated to the conditions in which the units may have to work. The following chapters describe all the functions managed by the software, from common functions present in all units to functions dedicated to specific operations.
Page 18 2.2 Set point management The control set point mainly depends on parameters ST1 and ST4. The relevant settable minimum and maximum setpoint parameters are shown below. Parameter Min. Max. Description °C Chiller - Setpoint °C Chiller - Minimum Setpoint °C Chiller - Maximum Setpoint °C Heat Pump - Setpoint...
Page 19 2.2.2 Dynamic set point from external air probe To obtain the set point change from external air probe, it is necessary to have parameter SD1=1. In chiller operating mode, the parameters involved are shown in the table. Parameter Value Description °C Chiller - Setpoint Dynamic Setpoint type...
Page 20 With reference to the values set in the table, this corresponds to the graphical representation of the set point change as regards the air temperature value shown in the figure. Fig. 3 Change in set point as the air temperature changes in heat pump operating mode Where "Ta"...
Page 21 2.2.3 Dynamic set point from signal The type of signal used is 4-20mA, 0-1V, 0-10V and 0-20mA. To obtain the set point change from signal, it is necessary to have parameter SD1=2/3/4/5 respectively for the 4 types of signal. In chiller operating mode, the parameters involved are shown in the table. Parameter Value Description...
Page 22 In heat pump operating mode, the parameters involved are indicated in the table. Parameter Value Description °C Heat Pump - Setpoint Dynamic Setpoint type SD23 °C Dinamic Setpoint probe - Max increase/decrease setpoint in heat pump mode Fig. 5 Change in set point as the analogue signal changes in heat pump operating mode Where "V/mA"...
Page 23 2.3 Energy Trend The function “Energy trend” is featured on units as an option. This function estimates the unit operational efficiency (“EER” when operating in cooling mode or “COP” when operating in heating mode) as the current operating conditions and the set parameters change. If you wish to access the data estimated by the function, go to the main menu and select the function “ENERGY TREND”...
Page 24 2.3.5 Logs The measured operating values are not only viewed on the display, but they are also recorded in the controller memory over time. The values are recorded in the “logs”. “EnergyTrendHours” is used to record the values concerning the energy absorbed and generated on an hourly basis, and the number of minutes the unit has been in operation every hour.
Page 25 File "EnergyTrendHistory.txt" Reference Description DATE Date type yyyymmdd EN_IN_CH Energy absorbed on a daily basis in chiller mode [kWh] EN_OUT_CH Energy generated on a daily basis in chiller mode [kWh] EER_AVG Average daily EER EN_IN_HP Energy absorbed on a daily basis in heat pump mode [kWh] EN_OUT_HP Energy generated on a daily basis in heat pump mode...
Page 26 2.4 Smart Grid ready The two digital inputs provided help override thermoregulation to operation in hot mode. This function does not trigger when thermoregulation is operating in cold mode. Units are always provided with this function although it is not enabled. When the function is enabled, the status of the two featured digital inputs combined activates the 4 operating modes listed in the table.
Page 27 If the “ACS” function is featured, this operating mode stops it. If a seasonal mode change occurs during operation in heating mode or where the “ACS” function is enabled in cooling mode, the unit performs thermoregulation in cooling mode. 2.4.3 Operating mode 2 Activation of this operating mode requires that both digital input “1”...
Page 28 2.4.6 References on user interface The function can be managed using the parameters described above or using the user interface. When “setpoint” is selected in the main screen, a click on the “Smart Grid ready” icon and entry of the relevant password give access to a screen where the two setpoint values and the maximum overriding time of hot mode shutdown are enabled and set up.
Page 29 The certificate requires that the connection is activated within two years from its issue. A connection between a fixed unit IP and the Internet is required. If you wish to enable the “Swegon Inside” function on units that were manufactured before week 24 of 2023, the minimum requirements below must be checked: 1.
Page 30 2.6 Thermoregulation The thermoregulation of the unit depends on parameter ST9 that determines on which temperature probe the controller must guarantee maintenance of the temperature set as the set point, and on parameter ST11 that determines the type of control. With the combination of settings, it is possible to have: - ST9 = 0 and ST11 = 0 - proportional input registration;...
Page 31 Fig. 6 Graphical representation of steps in Chiller operating mode Example of proportional control in chiller mode. “Tin” indicates the water temperature at the inlet of the unit. In the case of Heat Pump, the following formula is used to calculate the number of resources to be activated: ST8/(CF7 + CF8 + CF9 + CF10) Fig.
Page 32 2.6.2 Outlet control with neutral zone and PID The reference probe is placed on the common outlet of the evaporator. The resources (compressors) are activated/deacti- vated depending on a set point and a differential, complying with the reference delays. Parameter Min.
Page 33 Example of control with neutral zone in heat pump mode Fig. 9 Graphical representation of operation in heat pump mode and outlet control As long as the reference water temperature is less than (<) ST4 - ST31, the compressors of the unit will be activated com- plying with the delays included in parameters ST27 and ST26.
Page 34 2.7 Time bands 2.7.1 General The controller offers the possibility to control unit switch-on and switch-off and energy saving according to time bands. The system enables setting 3 time bands and selecting one of the 7 possible combinations for each day in the week. The time bands in parameter cluster “ES”...
Page 35 2.7.3 Energy saving This function is used to edit the unit operating setpoint with the help of an “offset” and to enter a new differential. When the “Energy saving” function is active, the “Offset” setpoint in parameter “ES14” is algebraically added to the unit setpoint in cooling mode and the setpoint value in parameter “ES16”...
Page 36 2.8 Limitation of refrigeration capacity There are some operating conditions for which the refrigeration capacity of the unit can be limited automatically or neces- sarily. Limitation can be done in 4 different ways: - from pressure probe (always present) - from amperometric transformer (accessory) - from digital input (accessory);...
Page 37 2.8.1 Limitation of refrigeration capacity from pressure probe In some operating situations of the unit (too high condensing pressures or too low evaporating pressures) it may be useful to limit the capacity of the compressor. The parameters involved in limitation of refrigeration capacity with reference to condensing pressure are shown in the table.
Page 38 Deactivation of capacity reduction in the circuit takes place when the following conditions are verified: - in chiller operating mode, when the evaporating pressure is higher than UN9 + UN10; - in heat pump operating mode, when the evaporating pressure is higher than UN11 + UN12; Cooling capacity limitation in units with several steps per circuit depends on the value set in parameter “UN13”.
Page 39 2.8.2 Limitation of refrigeration capacity from amperometric transducer Limitation of refrigeration capacity can be carried out through an amperometric transducer that measures the current drawn by the unit. The parameters involved are shown in the table. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description...
Page 40 2.8.3 Limitation of refrigeration capacity from digital input Limitation of refrigeration capacity can be carried out from digital input. The parameters involved are shown in the table. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description...
Page 41 2.9 Circuits and compressors To meet the thermoregulation request from the system, the controller activates and deactivates the compressors of the circuits present in the unit as required. The management of individual compressors, and also of the combination of compressors, takes place according to the setting of the relevant parameters.
Page 42 In the graph, beside the parameters of the function, there are the abbreviations that refer to: - Rqs = thermoregulation request - R_St = actual status - Unt = reference to the unit - Cmp1 = reference to compressor 1 - Cmp2 = reference to compressor 2 2.9.2 Activation of the compressors between the circuits...
Page 43 2.9.5 Capacity balancing principle Parameter CO15 set to "5" The controller provides for demand distribution and balances it among the existing circuits. Any demand increase is fulfilled by the circuit with fewer compressors in operation. Any demand reduction is fulfilled by the circuit with more compressors in operation. The sequence followed to start and to stop the compressors in one circuit is implemented with a view to balancing hours/ starts, based on the value set in parameter CO16.
Page 44 2.9.7 Management of compressor with inverter The controller includes management of the inverter on single- and dual-circuit chiller and heat pump units. The refrigerant circuit can consist of just the compressor with an inverter or of one compressor with an inverter and one or two on-off compressors.
Page 45 Fig. 14 Representation of the areas of operation in chiller and heat pump mode where PDW = Deactivation zone NZ = Neutral zone PUP = Activation zone In the activation zone, the count increases with the times indicated in the thermoregulation chapter. Calculation of the count involves parameter CO36.
Page 46 CO38 %cprCi CO40 C On/Off Fig. 15 Graphic representation of the starting of the compressor with inverter and one on-off compressor In addition to the parameters present in the table, the other abbreviations in the graph indicate: - %Pr = capacity percentage required by thermoregulation - %cpr Ci = percentage coefficient required of the compressor with inverter - C On/Off = status of the on-off compressor - t = time...
Page 47 Thermoregulation demand to two inverter compressors When the capacity is calculated based on the thermoregulation demand, the controller manages the two compressors with inverter fitted in the circuit. The controller starts the count after complying with the delays from the starting of the unit and of the pump, if any. The graphic representation below shows how the controller manages the two compressors with inverter as the capacity required by thermoregulation increases.
Page 48 2.10 Ventilation The controller provides for the management of step ventilation or in continuous mode with modulation of the 0-10V signal. The stepped control can have up to 4 steps per circuit with relevant 4 digital outputs. With control in continuous mode, for each circuit there is a digital output for activation of ventilation and an analogue output with modulating circuit for control of a speed adjuster.
Page 49 Parameter Description FA47 FA12 °C Floating condensation - CH - Cut-off override at min. outside temperature FA48 110.0 °C Chiller - Max. condensing temperature limit PAL80 Fan overload - delay alarm PAL81 Fan overload - Maximun number alarms in one hours 2.10.1 Ventilation in common or separate Ventilation is managed according to the configuration of the unit.
Page 50 2.10.2 Management of stepped ventilation In the management of stepped ventilation, up to 4 steps can be present for each refrigerant circuit. In chiller operating mode, the set point and temperature values for the maximum condensing speed represent 100% of the range in which the parameters can be set for activation of the steps.
Page 51 Stepped ventilation management in heat pump mode is shown graphically below. Fig. 18 Stepped ventilation control in heat pump operating mode 2.10.3 Ventilation management with speed adjuster With speed adjuster, ventilation is managed in continuous mode. For each refrigerant circuit, there is a digital output for activation of ventilation and an analogue output with modulating cir- cuit for control of a speed adjuster.
Page 52 FA11 FA12 T.cond °C Fig. 19 Analogue output for control of the speed adjuster In chiller operating mode, ventilation is activated when the condensing temperature is higher than FA8 - FA11 + FA12 and is deactivated when the condensing temperature is lower than FA8 - FA11.When the condensing temperature is between values FA8 and FA9, the analogue output modulates between the percentages of values FA6 and FA7.
Page 53 2.10.4 Floating condensation control This function is used for the dynamic recalculation of the ventilation control ramp as the outside air temperature varies. The function “Floating condensation control” is only available in cooling mode. This function is featured in software versions starting from 1.105.90. The table below shows the operating parameters involved.
Page 54 The controller calculates the coefficients with reference to parameters “FA42” and “FA43”. Each coefficient is calculated by interpolation of a pair of parameters: - coefficient “x” is calculated by interpolation of parameters “FA8” and “FA44”; - coefficient “y” is calculated by interpolation of parameters “FA9” and “FA45”; - coefficient “t”...
Page 55 2.10.5 Night Shift System Through the setting of daily time bands, the additional "Night Shift System" function allows the unit to be operated in high efficiency mode or in low noise mode as required. The function can be activated only for condensing control and with proportional ventilation control. The parameters involved in the operation are shown in the table (1 = function active;...
Page 56 2.10.6 Night Shift System with floating condensation control The controller offers the possibility to enable these two functions at the same time. Unit operation is the result of the two functions summed. The function with relevant parameters is shown graphically below. FA30 FA31 T.cond °C...
Page 57 2.10.7 Fan stop prevention function This function is intended to prevent a fan stop as a result of forming ice. The function gets activated when the air temperature value is below the activation threshold. The parameters involved are shown in the table. The values of the parameters are representative.
Page 58 2.10.8 Ventilation alarms The alarms regarding this function are shown in the table. Alarm code AL35..AL40 The digital input is ignored for the delay set in parameter PAL80 AL35; with digital input of circuit 1 open AL36; with digital input of circuit 2 open Reason for activation AL37;...
Page 59 2.11 User-side pumps Management of the pumps in the unit takes place based on the number of pumps configured. The application manages the pumps through the setting of the PA parameters. The parameters involved are shown in the table. Parameter Description Users - Pump management 10 s...
Page 60 2.11.1 Management of unit without pumps or with one pump The parameters involved in activating the unit with one pump are shown in the table. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description...
Page 61 2.11.2 Management of 2 pumps In the version with 2 pumps, these are always with one on standby while the other is working. The switching between pumps (to balance the hours of operation of each one), can be manual or automatic. In any case, switching takes place in case of breakdown.
Page 62 Fig. 27 Graphical representation of the alarms of the pumps The graph shows: 1. the unit running with thermoregulation request (Tr.req = on) and pump 1 active (P1 = on); 2. operation of the thermal overload protection of pump 1 (Th1 = on) with activation of the relevant alarm (AL45 = on), deactivation of pump 1 (P1 = off) and activation of pump 2 (P2 = on);...
Page 63 2.11.3 Management of 3 pumps In the version with 3 pumps, these are normally all running. Simultaneous operation of just 2 pumps is included only in particular conditions. In units with 3 pumps, parameter PA1, which determines water circulation management in the unit, is set to 1. The parameters involved in the management of two pumps are shown in the table.
Page 64 2.11.4 Management of the pumps in antifreeze function With the controller, there is the possibility of using system water circulation to prevent freezing of the heat exchanger during periods when the machine is stopped. So that water circulation can impede freezing of the exchanger, the unit must be electrically powered and circulation must not be prevented by the status of valves and taps.
Page 65 2.11.5 Pulse Function The “Pulse” function allows the pump to be switched on and switched off based on some set times when the request for starting up the compressors from thermoregulation is not present. This function combines activation of the pump of the unit with the thermoregulation request. The parameters involved are shown in the table.
Page 66 2.11.6 Pump alarms The alarms that regard the pumps are shown below. Pump maintenance AL143 maintenance of pump 1; AL144 maintenance of pump 2; AL145 Alarm code maintenance of pump 3 Reason for activation This is detected when the work hours exceed the value of parameter PA18 Reset Upon deletion of the hours in the Service or Maintenance menu Alarm icon...
Page 67 2.12 User-side pump The controller can control a water circulation valve. The water circulation valve is controlled by the controller in connection with the user-side pump. The control process consists in the following: - pump start-up is delayed so that the valve can open fully; - valve closing is delayed after pump switch-off.
Page 68 2.13 Heat recovery pumps Management of the heat recovery pumps of the unit takes place based on the number of pumps configured. The heat recovery pumps are managed by the controller through the setting of the PA parameters. The parameters involved are shown in the table.
Page 69 Thermal overload protection in recovery pumps/desuperheater AL243 Thermal overload protection of pump 1; AL244 Thermal overload Alarm code protection of pump 2 Reset With digital input closed Reset mode Always manual Alarm icon Flashing AlarmLog Devices Behaviour in the event of an alarm Pump Operation of the pump in alarm is prevented Recovery...
Page 70 2.14 Liquid injection valve To activate this function, the PTC discharge probe must be configured for each circuit present in the unit. All the parameters involved with this function are shown in the table. Parameter Value Description Control of discharge temperature - Activation Setpoint of the liquid injection solenoid CO51 °C valve...
Page 71 2.15 Oil return The oil return function consists of the increase in cooling capacity of the circuit when it remains at reduced capacity for a long time. The increase in cooling capacity causes an increase in the speed of the refrigerant in the exchangers and facilitates oil return to the compressor.
Page 72 Prolonged operation of the same compressor When just one compressor remains in operation in a circuit for a time longer than parameter CO47, the controller forces the activation of another compressor. Irrespective of the thermoregulation request, the forcing stays active for the time set in parameter CO45. After time CO45 has elapsed, forcing stops and, if not required by thermoregulation, the compressor that was in operation first is stopped.
Page 73 2.15.2 Oil return for compressors managed with inverter All the parameters involved with this function are shown in the table. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description CO46 Oil return - Inverter: Delay in compressor override activation (0=disab.) Oil return - Scroll ON/OFF: delay in procedure activation - Inverter: compressor over- CO47 ride duration...
Page 74 2.16 Heat recovery During operation of the unit in chiller mode, this function allows recovery of the heat that is normally rejected by the conden- sing coil. Heat recovery takes place by heating the water. When the function is active, condensation takes place in a water exchanger while the condensing coil and the ventilation are deactivated.
Page 75 2.16.2 Recovery management In addition to activation, the controller manages heat recovery and checks the suction and delivery pressures, and with delays. The parameters involved are shown in the table. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description...
Page 76 2.16.3 Recovery alarms The alarms that regard recovery are shown below. Alarm code AL207.. AL210 circuit 1 .. 4 recovery disabled Reason for activation This is detected if the delivery pressure exceeds threshold RC7 Reset When the delivery pressure is lower than value RC7 - RC8 for time RC9 Reset mode Manual Alarm icon...
Page 77 2.17 Desuperheater The function of the desuperheater is to recover a portion of the heat generated by the superheated gas at the compressor exhaust and to use it to heat water. For correct refrigerant circuit operation, the superheated gas must not, however, be cooled to such extent that it conden- sates.
Page 78 2.17.2 Desuperheater management When the water reference temperature exceeds the setpoint value stored in parameter “RC13”, the controller stops the OK signal that enables desuperheater operation. The signal is output again when the water reference temperature is smaller than the value resulting by subtracting the setpoint in “RC13” and the “RC14” differential value. When the reference value of the water temperature is lower than the condensing temperature (“t cond”) plus the differential value “RC22”...
Page 79 2.18 Antifreeze control in recovery system/desuperheater During operation of the units, or while they are in stand-by conditions and the ambient temperature is below zero, the water inside the exchangers can freeze. Ice formation inside the exchangers can irreparably damage them. The controller runs dedicated processes to prevent the formation of ice in the heat exchangers.
Page 80 2.18.2 Management of the pumps in antifreeze function The controller features an option by which water is circulated to prevent freezing of the heat exchanger provided that the conditions to enable the antifreeze function are in place (parameter “AR14” = 3). So that water circulation can impede freezing of the exchanger, the unit must be electrically powered and circulation must not be prevented by the status of valves and taps.
Page 81 2.19 Pump down This function causes the refrigerant circuit to stop following the closing of the expansion valve and the reaching of the suction pressure at the switch-off threshold in pump down. The parameters involved are shown in the table. Parameter Description Enables pump down function...
Page 82 2.19.2 Pump down alarms The alarms regarding pump down are shown below. Alarm code AL122.. AL125 pump down alarm for circuits 1 .. 4 Reason for activation When PD1 is different from "0" and the switching off of a refrigerant circuit is required Reset Automatic, and becomes manual after PD7 occurrences/hour Reset mode...
Page 83 2.20 Refrigerant leak detector management The refrigerant leak detector is a system component that must always be in efficient conditions. In order for the detector to be efficient, it must be inspected/calibrated as instructed by the manufacturer. Based on the time of the last inspection/calibration, the controller generates messages/alarms to warn about maintenance being needed.
Page 84 The controller blocks the unit after the days specified in the alert have elapsed. When the unit is blocked, a message appears on the main screen to inform that the unit has been blocked because the calibration time has expired. Alarm message “AL342”...
Page 85 2.21 Refrigerant leak detection management The controller manages refrigerant leaks that do not affect safety. The procedure to manage safety matters in connection with flammable refrigerant leaks in units filled with “R290” and indoor units filled with refrigerant “A2L” is illustrated in the “Instruction Manual for installation, operation and maintenance”.
Page 86 2.21.3 Refrigerant leak alarms The refrigerant leak alarms are shown below. Alarm code AL156.. AL159 refrigerant leak alarm of circuits 1 .. 4 Reason for activation When PD1 = "5" and digital input of the controller regarding the refrigerant detector is open Reset Automatic, and becomes manual after PD7 occurrences/hour Reset mode...
Page 87 2.22 Free Cooling Free cooling is the function that allows air temperature to be used to cool the user water. Depending on the set parameters, the controller can manage this function in various ways. In any case, when conditions are suitable, the controller activates the free cooling resources before the compressors and deactivates them after deactivating the compressors.
Page 88 2.22.1 Free cooling with air/water coil When conditions are suitable, the user water goes through an air/water coil before going through the evaporator. The diversion is normally made through a 3-way valve. With the flow through the air/water coil, the need to activate the compressors is reduced up to the complete stopping of them.
Page 89 A graphical representation is shown below. Fig. 40 Temperature conditions for enabling the free cooling function In addition to the parameters present in the table, the other abbreviations in the graph indicate: - FC ON = free cooling active - FC OFF = free cooling not active - Tin_fc - Tair = difference in temperature between the water returning from the system and the ambient air.
Page 90 2.22.2 Thermoregulation with the free cooling function When the function is active, the controller uses the free cooling resources for water cooling before activating the compres- sors. According to the settings, the controller can manage the resources with reference to the water temperature at the inlet or outlet of the unit.
Page 91 In the case of control at outlet, when the water temperature is above the neutral zone, the controller activates the ventilation first, whereas when it is below the neutral zone, it deactivates the ventilation last. The parameters involved in the management of the function are shown in the table. The values of the parameters are representative.
Page 92 2.22.3 3-way valve management When conditions are suitable for free cooling, the 3-way valve diverts the flow of water to make it go through the free cooling coil before the evaporator. The 3-way valve can be an on-off or modulating valve. To prevent the water temperature at the outlet of the unit from reaching values that are too low, the controller manages the 3-way valve and modulates its opening up to complete closing.
Page 93 2.22.4 Stopping of compressors In free cooling units, the use of compressors to meet the thermoregulation request is limited by the air temperature. The use of the compressors to meet the thermoregulation demand is limited by the air temperature. Generally, when the air temperature value is low, the thermoregulation request is met by the free cooling function. During starting of the system, particular conditions can occur for which activation of the compressors may be temporarily required.
Page 94 2.22.5 Free cooling with dampers The controller manages units with free cooling, where the ventilation is common for both the condensing coil and the free cooling coil, and the passage of air is controlled by dampers. Fig. 46 Diagram of free cooling unit with dampers The abbreviations in the figure indicate: - FC = free cooling coil with damper - COND = condensing coil with damper...
Page 95 2.22.6 Free cooling with No Glycol In systems where user-side water cooling is exploited through an air/water exchanger, an adequate percentage of glycol must be present to prevent freezing. "No Glycol" free cooling allows free cooling to be exploited without having to put glycol in the water of the entire system. Thermal exchange between the hydraulic circuit of the system of use and that of the free cooling circuit takes place by me- ans of a water/water decoupling exchanger.
Page 96 The parameters involved in the management of the function are shown in the table. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description Freecooling type °C Differential close 3way valve freecooling / NG pump off Enables no-glycol free cooling °C Temperature differential to activate freecooling from water end outdoor temp...
Page 97 2.22.7 Free cooling alarms The free cooling function alarms are shown below. Alarm code AL050 free cooling pump circuit breaker alarm Reason for activation With opening of the relevant digital input Reset Manual Reset mode Only after closing of the digital input Alarm icon Flashing AlarmLog...
Page 98 2.23 Defrost Defrosting is a procedure in which frost accumulation on the condensing/evaporating coil is prevented and/or any frost that has formed is removed during operation in heat pump mode of an air/water unit. An effective defrost cycle ends with a completely clean condensing/evaporating coil. The controller manages defrosting differently according to the settings made and the air temperature conditions.
Page 99 The stages of a defrost cycle are as follows: - check of defrost start conditions (at fixed or sliding evaporating pressure); - check of type of defrost to carry out (with air or with refrigeration cycle reversal); - preparation for cycle reversal; - refrigeration cycle reversal and defrost of the condensing/evaporating coil;...
Page 100 The parameters involved are shown in the table. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description Defrost method dF10 -12.0 °C Fixed evaporating threshold to start defrost dF11 Defrost start delay dF17 Delay to defrost after the unit is switched on dF18...
Page 101 2.23.4 Type of defrost After verifying that there are conditions requiring a defrost, the controller selects the most efficient type of defrost as regards the operating conditions of the unit. The choice of the type of defrost depends on the ambient air temperature. If the ambient air temperature is higher than the value set in parameter dF34, the controller starts an air defrost otherwise it starts the procedure for a defrost with refrigeration cycle reversal.
Page 102 2.23.7 Refrigeration cycle reversal and defrost With reversal of the refrigeration cycle and the stopping of ventilation, defrosting of the coil starts. The parameters involved are shown in the table. Parameter Value Description dF45 1 - Yes Ventilation during defrost dF46 43.0 °C...
Page 103 2.23.8 Preparation and new cycle reversal Whatever way a defrost with refrigeration cycle reversal is ended (due to reaching the end-of-defrost threshold or due to reaching the time limit), the next stage is preparation for a new reversal of the refrigeration cycle and then resumption of operation in heating mode.
Page 104 2.23.10 Defrost alarms If, within the defrost time limit, the condensing temperature has not reached the end-of-defrost threshold, the controller ends the defrost in progress in any case. In the alarm pages, the controller records and displays the defrost cycles that end when the time limit is reached without stopping any compressors.
Page 105 2.24 Anti Ice Circuit In order to prevent ice from forming at the base of the air exchanger working as an evaporator, the last supply is used for the operation of the Anti-Ice Circuit. The controller manages this part of the exchanger through a digital outlet that powers a solenoid valve. The solenoid valve is powered when the air exchanger works as an evaporator and during defrosting if the temperature of the air is lower than the activation threshold, but it is always powered when the exchanger works as a condenser When conditions are suitable for activation, the function can be activated with a pause-work cycle depending on parameters...
Page 106 2.25 Anti-freeze heaters During operation of the units, or while they are in stand-by conditions and the ambient temperature is below zero, the water inside the exchangers can freeze. Ice formation inside the exchangers can irreparably damage them. To prevent ice formation inside the exchangers, the controller can manage auxiliary heaters. The parameters involved are shown in the table.
Page 107 2.25.2 Reference probe Depending on the unit, there can be one or more reference probes for activation of the heater output. The number of probes present is linked to the type of unit and to the number of water exchangers. For air/water units, the cases can be the following: - in the case of one exchanger, the reference probe is the one installed on the water outlet;...
Page 108 2.26 Heater in condensate drip tray This function is intended to prevent freezing of the water that forms in the condensate drip tray during the defrost cycles. The function gets activated when the air temperature value is below the activation threshold. The parameters involved are shown in the table.
Page 109 2.27 Auxiliary heating This function allows management of a heating device to supplement operation in heat pump mode or as an alternative to it. The controller can manage up to 4 digital outputs to obtain 4 steps and a 0/10 V analogue output. Activation of this function is possible only for units that can operate in heat pump mode.
Page 110 As regards air temperature, with the setting of parameter AH5, it is possible to decide on deactivation of the operation of the compressors after delay AH7. The parameters involved are shown in the table. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description...
Page 111 Parameter Value Description Type of temperature control °C Heating ON/OFF - Main probe setpoint on hot side ST8 or AH10 °C Heating ON/OFF - Proportional band ST10 AH11 °C Heating 0-10V - Main probe setpoint on hot side ST8 or AH12 °C Heating 0-10V - Proportional band...
Page 112 Fig. 51 Digital and analogue output of auxiliary heating with off-set In addition to the references present in the table, T ref = reference water temperature. 2.27.4 Auxiliary heating with independent set point This control function is used to activate auxiliary heating with its own set points and differentials; in this way, its management is not linked to the set point of the compressors in operation in heat pump mode.
Page 113 2.28 “ACS” function The “ACS” function is designed for the production of hot water for sanitary use, which prioritises the system demand. 2.28.1 General This function enables the controller to manage a 3-way valve to divert the water flow, which goes through the heat exchan- ger in the unit, towards the hydraulic circuit of the enabled function.
Page 114 Parameter Description ACS1 Enabling of domestic hot water ACS2 Enables setpoint from BMS ACS3 ACS5 ACS6 °C Setpoint ACS4 25.0 °C Control diff. ACS5 -50.0 ACS6 °C Minimum Setpoint ACS6 ACS5 °C Maximum Setpoint ACS7 -50.0 °C Forced output set point ACS8 25.0 °C...
Page 115 The following parameters listed in the table are also controlled for the production of hot water for the air conditioning system. Parameter Description 28.0 65.0 Heat Pump - Maximum Setpoint SD15 -30.0 65.0 °C Operating limit - HP setpoint reduction start point Operating limit - Minimum outside temperature limit for HP setpoint re- SD16 -30.0...
Page 116 The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description ACS10 45.0 Activation delay ACS11 45.0 Deactivation delay ACS31 Three-way valve movement time Minimum OFF time 10 s User - Compressor activation delay from pump start-up 10 s Users - Pump Off delay from switch-off of compressors Below is a graphical representation of the operating steps required to switch from air conditioning to sanitary mode, and...
Page 117 In addition to the parameters present in the table, the other abbreviations in the graph indicate: - F.op = enabled function; - Cond.S = unit operating in air conditioning mode; - ACS.S = unit operating in sanitary mode; - R.ACS = status of demand from sanitary system; - Cmp = compressor status;...
Page 118 2.28.4 “ACS” temperature regulation A sensor is provided in the controller that must be installed in the relevant tank to activate generation of hot domestic water. The controller activates generation of hot domestic water when the domestic water temperature value is lower than the relevant setpoint minus its differential.
Page 119 In addition to regulating the water temperature measured at the heat exchanger outlet, the controller also includes some override functions to manage the demand of hot domestic water. If the demand is not fulfilled and all the available power steps are not enabled within the time setpoint in parameter “ACS12”, the controller overrides to the next step.
Page 120 2.28.5 Forced exit from “ACS” The controller may stop the “ACS” function before a demand is met due to many other conditions than merely exceeding the max. time to fulfil the hot sanitary water demand. The parameters involved are shown below. The values of the parameters are representative.
Page 121 2.28.6 Time bands for “ACS” function The controller can manage the hot water production setpoint for the sanitary system according to time bands. An offset is added to the setpoint that represents the period defined within each time band. If the offset is positive, then the setpoint is increased;...
Page 122 2.28.8 Max. setpoint compensation in heating mode These units are manufactured to produce hot water to be used both for air conditioning and sanitary purposes at very high temperatures. To prevent damage to the compressors in the event of operation outside their working ranges, the software features a com- pensation function that is linked to the air temperature and limits the max.
Page 123 2.28.9 Heater management The controller can manage up to 4 supplementary power steps, which may be either heaters or any other external source to the unit. Depending on the setting, they may be used to supplement the compressor heating power during the production of hot sanitary water or to replace the compressors when they are being defrosted and during the anti legionella cycle.
Page 124 2.28.10 Anti legionella cycle The controller can manage an anti legionella cycle while producing hot sanitary water. The anti legionella cycle requires that hot water be produced in the sanitary circuit at a different setpoint value, i.e. a higher value than the normal working value. The cycle is run one day a week, starting from a preset time, lasting for a min. time and with a max.
Page 125 Alarm code AL258 Warning: failure to perform anti legionella cycle The production of hot sanitary water has not achieved the setpoint within the time set in Reason for activation parameter “ACS7”. Reset Automatic Reset mode Automatic Alarm icon AlarmLog Devices Behaviour in the event of an alarm Air conditioning function After temperature regulation...
Page 126 2.29 Vapour/liquid injection with controller EXD-TEVI In applications that include the production of high temperature water, compressor exhaust gas superheating control may be necessary. The control takes place by vapour/liquid injection and is managed by a dedicated stand-alone electronic controller EXD-TE- Each controller manages two compressors connected in tandem.
Page 127 2.29.2 Displayed parameters The other parameters managed by the controller can be displayed using the "SEL" button. To display the other parameters: - press the "SEL" button for three seconds to access the parameters; - on pressing the "SEL" button for one second and releasing it, the various parameters will scroll cyclically in the sequen- ce shown in the table.
Page 128 2.29.4 References on the controller of the unit The exchange of information between controller EXD-TEVI and the controller of the unit takes place through potential-free contacts. When the controller of the unit detects the closing of one of its digital inputs, it records the presence of an error/alarm on the injection controller.
Page 129 2.30 Flowzer The “Flowzer” function is designed to define the speed setpoints for the pump fitted in the unit that help meet the demand received from different system types. Specific logics have been developed according to which the controller manages the hydraulic systems connected to the unit.
Page 130 The arrow buttons are tapped to select the “Flowzer” function, after which the “ENTER” button must be pressed to confirm the selection. Below are some screens associated to one of the “Flowzer” functions: they show the operating status with the main para- meters.
Page 131 2.30.1 General All functions have some parameters in common which are used to control the pump fitted in the unit. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description FMG1 50.0 Common - Min.
Page 132 2.30.3 “DT” function The “DT” function is designed to change the pump speed in order to have a constant temperature difference between the unit inlet and outlet. The resulting effect is that the temperature of water supplied to the system is constant. When the load is reduced, the water flow rate is reduced accordingly, which results in consumption saving.
Page 133 If the function is not designed to manage other features than temperature difference control on the heat exchanger side fitted in the unit, the hydraulic diagram of the installation is approximately as follows. Vmin. Fig. 63 Pump in unit used for water circulation in the system If the function is designed for flow rate control on the heat exchanger side fitted in the unit, the hydraulic diagram of the installation is approximately as follows.
Page 134 If the function requires management of a bypass valve to control the pressure difference on the heat exchanger side, the hydraulic diagram of the installation is approximately as follows. A040 BP41 ΔPex Vmin. Fig. 65 Pump in unit used for water circulation in the system with bypass valve If the pressure difference on the heat exchanger side is lower than the value in parameter “PA22”, the controller opens the bypass valve at the percentage setpoint (pre-positioning) stored in parameter “FMG58”.
Page 135 2.30.4 “VDE” function The “VDE” function is designed to set the pump speed in order to have a constant pressure difference between the unit inlet and outlet. The speed of the pump is set automatically to preserve the desired flow through the heat exchanger in the unit. This function is useful when the head of the pump aboard the unit is greater than the system requires, which would result in a higher water flow circulating.
Page 136 2.30.5 “VD” function The “VD” function is designed to set the pump speed in order to have a constant pressure difference between the delivery and the return lines in the system. If the pressure difference at the ends of the system is kept constant, the pump speed is set automatically in order to have the desired flow as the load changes.
Page 137 2.30.6 “VFPP” function The “VFPP” function is designed to control variable flow systems to the primary circuit. As demand changes, the system keeps stable the difference in water pressure and temperature in the system delivery line. The water flow rate and temperature are independent variables and they are not directly connected. Pump control (only one pump in the system) provides for the necessary flow rate, while cooling capacity control ensures the correct temperature.
Page 138 If the pressure difference on the heat exchanger side in the unit during the process to keep the pressure difference in the sy- stem constant is lower than the value in parameter “PA22”, the controller opens the bypass valve at the percentage setpoint (pre-positioning) stored in parameter “FMG58”.
Page 139 2.30.7 “VPS” function The “VPS” function is designed for flow rate modulation to the primary circuit following that of the secondary circuit, having as reference the water temperature difference measured between the outlet of the primary circuit and the bypass pipe. The water flow rate in the primary circuit is always set up within the limits set for correct operation of the refrigerant unit.
Page 140 The hydraulic diagram below shows a system featuring this function. BP41 BTWB ΔPex Vmin. Fig. 69 System diagram with “VPS” control Translation from original instructions We reserve the right to make changes without any prior notice.
Page 141 2.31 SMART Link The "SMART Link" function prepares the refrigerant units for serial connection with "GOLD" ventilated units. Through the serial connection, the "GOLD" unit intervenes in the water temperature value of the refrigerant unit to optimize system operation and reduce energy consumption. This function is available for both chiller units and heat pump units.
Page 142 2.31.2 Serial connection Serial connection between the refrigerant unit and the "GOLD" unit is to be carried out by the installer and must be done on the serial port RS485 of the controller at terminals 97, 98 and 99, respectively corresponding to (-), (+) and (GND). 97 (-) 98 (+) 99 (GND)
Page 143 2.32 SMARTLink + The “SMARTLink+” function is designed to set up the refrigerant units for connection to as many as ten ventilating units of any version whatsoever (“GOLD” units and chilled beam systems) using an Ethernet port. The Ethernet connection enables multiple ventilating units to be involved in the definition of the water temperature value of the refrigerant unit with a view to optimizing system operation and reducing energy consumption.
Page 144 Please find below a list of values set in the “SML” parameters: - parameter “SML1” is used to set the number of ventilating units featured; - the hydraulic circuit to which each ventilating unit is connected is set in parameter SML2: 0 = None; 1 = Circuit A; 2 = Circuit B - the type of user connected is set from parameter “SML13”...
Page 145 Move in the various fields using the arrow buttons and press “ENTER” to confirm after entering the necessary parameters, according to the system in which the refrigerant unit is fitted. As soon as the number of ventilating units is set up, the value entry fields are enabled. The value to be entered in the field “IP address”...
Page 146 2.32.3 Determination of operating mode (only for heat pump units) The operating mode of heat pump units is connected to the value set in parameter “SP9”, which may be: - 0 = from user interface; - 1 = from digital input; - 2 = from SMART Link+.
Page 147 2.33 Energy meter The option “Energy meter” is designed to control the main electrical parameters of the unit. This measuring instrument is installed in the electrical cabinet of the unit and it is configured at the factory. It communicates with the controller serially. 2.33.1 Viewing of measured parameters Specific screens are provided to show the measured parameters.
Page 148 2.33.2 Limitation of absorbed current using “Energy meter” The option “Energy meter” may be integrated with an additional option that is designed to limit the electric current absorbed by the unit. The current limitation option is not available for sizes where the number of compressors is not enough for correct operation. The controller uses as reference the greatest value of absorbed current on the three phases.
Page 149 2.34 Electronic expansion valve The use of the electronic expansion valve allows very precise, stable and reliable control of refrigerant flow with consequent increase in efficiency. The controller manages the electronic expansion valve and controls its opening based on the performance required by the system in all working conditions, to ensure low superheating over time that optimizes the performance of the unit and increases the benefits of floating condensation.
Page 150 2.34.1 Superheating management The main parameter controlled by the electronic expansion valve is the superheating value of the gas at the outlet of the evaporator. The PID control algorithm allows the superheating value, at the various operating conditions, to be kept close to the value of the set setpoint.
Page 151 2.34.3 Control in low superheating conditions Prolonged continuation of the condition in which the superheating value is lower than the threshold set by the manufacturer will cause damage to the compressors. When this condition occurs, the controller changes the opening of the expansion valve. The relevant parameters are shown in the table.
Page 152 2.34.5 Control in LOP conditions The LOP (Low Operating Pressure) threshold set by the manufacturer is the suction pressure value below which the low pressure alarm intervenes with stopping of the refrigerant circuit. When this condition occurs, the controller stops the PID superheating control and, with suitable algorithm, opens the expan- sion valve.
Page 153 ALARMS 3.1 Introduction The active alarms generated by the application software can activate a relay, if suitably configured. The relay is switched on if: - there is an active alarm; - there is an alarm that has not been reset; The display is supplied with a buzzer.
Page 154 3.2 Unit alarms The unit alarms immediately cause all the compressors and relevant additional functions to be switched off. 3.2.1 Flow switch alarm Management of the flow switch alarm depends on whether or not pumps are present in the unit. If it is the controller that manages the pumps of the unit, the parameters involved are shown in the table below.
Page 155 In addition to the parameters present in the table, the other abbreviations in the graph indicate: - U/P = relating to the "unit" or "pump" device - On = state of the device - Off = state of the device - ID = digital input to which the flow switch is connected - O = open - C = closed...
Page 156 3.2.2 Antifreeze alarms The antifreeze alarms depend on the number of exchangers present in the unit. The parameters involved are shown in the table. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description PAL36...
Page 157 With the value of parameter PAL47 set to 6, the antifreeze alarm is managed with the probe installed on the water leaving the evaporator. Alarm code AL217 \ AL417 The temperature measured by the antifreeze probe is lower than the value set in parameter Reason for activation PAL36 When the temperature measured by the antifreeze probe is higher than the value set in...
Page 158 3.2.3 Low incoming water temperature alarm The alarm is active only in heat pump operating mode. The parameters involved are shown in the table. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description PAL84...
Page 159 3.2.5 Low ambient temperature alarm The alarm is detected only in heat pump operating mode. The parameters involved are shown in the table. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description PAL116 Enables the low outside air temperature alarm in heat pump mode...
Page 160 3.2.6 Wrong phase sequence alarm The alarm is detected only for the time set in parameter CO7 when the controller is started. The parameters involved are shown in the table. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description...
Page 161 3.2.8 Alarms for expansion modules not connected If communication between the controller and the expansion module fails, the outputs of the expansion module are deacti- vated after 5 seconds. Alarm code AL164 Reason for activation Non-communication between the controller and expansion module IPX306 Reset If the module is disabled or resumes communication Reset mode...
Page 162 3.2.11 “RTC” clock alarm Alarm code AL211 Reason for activation Low level of controller battery charge Reset When the controller time or date is reset. Reset mode Automatic Alarm icon Flashing AlarmLog Alarm relay Devices Behaviour in the event of an alarm All devices They follow their control Replace the controller if the alarm is not cleared after setting the time.
Page 163 3.3 Function alarms Alarms linked to the functions managed by the controller are described below. 3.3.1 Pump alarms The alarms that regard the pumps are shown below. Pump maintenance Alarm code AL143 maintenance of pump 1; AL144 maintenance of pump 2 Reason for activation This is detected when the work hours exceed the set limit Reset...
Page 164 Maintenance of recovery pumps/desuperheater Alarm code AL241 maintenance of pump 1; AL242 maintenance of pump 2 Reason for activation This is detected when the work hours exceed the value of parameter PA36 Reset Upon deletion of the hours in the Service or Maintenance menu Alarm icon Flashing AlarmLog...
Page 165 3.3.2 Ventilation alarms The alarms regarding this function are shown in the table. Alarm code AL35, AL36, AL37, AL38, AL39, AL40 AL35; with digital input of circuit 1 open AL36; with digital input of circuit 2 open AL37; with digital input of circuit 3 open Reason for activation AL38;...
Page 166 3.3.3 Recovery alarms The alarms that regard recovery are shown below. Alarm code AL207, AL208, AL209, AL210 circuit 1, 2, 3, 4 recovery disabled Reason for activation This is detected if the delivery pressure exceeds the set limit Reset When the delivery pressure is lower than value RC7 - RC8 for time RC9 Reset mode Manual Alarm icon...
Page 167 3.3.5 Refrigerant leak alarms The refrigerant leak alarms are shown below. If the refrigerant leak causes hazardous conditions, the electro-mechanical management procedure is illustrated in the “In- struction Manual for Installation, Use and Maintenance”. Alarm code AL156, AL157, AL158, AL159 refrigerant leak alarm of circuits 1, 2, 3, 4 Reason for activation When the digital input of the controller regarding the refrigerant detector is open Reset...
Page 168 3.3.7 Free cooling alarms The free cooling function alarms are shown below. AL50: overload alarm in free cooling pump 1; AL56: overload alarm in free Alarm code cooling pump 2. Reason for activation With opening of the relevant digital input Reset Manual Reset mode...
Page 169 3.3.8 Defrost alarms The defrost alarms are shown below. Alarm code AL186, AL187, AL188, AL189, AL190, AL191 defrost alarm Reason for activation If a defrost ends due to time limit instead of due to condensing temperature threshold Reset Automatic Reset mode At the next defrost ended with exceeding of the condensation threshold Alarm icon Flashing...
Page 170 3.3.9 Fast Restart alarms The alarms regarding this function are shown below. Alarm for power supply with UPS in 24 hours Alarm code AL192 Reason for activation With digital input open Reset With digital input closed Automatic with number of occurrences per hour smaller than or equal to PAL66 Reset mode Manual with number of occurrences per hour greater than PAL66 Alarm icon...
Page 171 3.3.10 “ACS” alarms Below is a list of the alarms regarding the “ACS” function. Thermal cutout of heater supplementing heating power in “ACS” system AL250, AL251, AL252 and AL253 Thermal cutout alarm - heaters Alarm code supplementing heating power in "ACS" Reason for activation Upon opening of the digital input configured for the corresponding alarms Reset...
Page 172 Forced exit from “ACS” function Alarm code AL257 Warning: forced exit from “ACS” Reason for activation As soon as “ACS7” value relating to output water temperature from unit is achieved Drop of the output water temperature in the unit by the value set in “ACS8” as opposed to Reset the “ACS7”...
Page 173 3.3.11 Alarms relating to 2-zone function (GIT option) Below is a list of the alarms linked to the function that is used to control up to 2 zones of the system (GIT option). Probe error in secondary circuit AL333 Error: probe in secondary circuit 1 AL334 Error: probe in secondary Alarm code circuit 2 Reason for activation...
Page 174 3.4 Circuit alarms The circuit alarms occur only on the compressors of the circuit involved. 3.4.1 High-pressure alarms For each refrigerant circuit, the delivery pressure is controlled by safety pressure switches and by pressure sensors. The parameters involved are shown in the table. The values of the parameters are representative.
Page 175 Probe high pressure alarm Alarm code AL10 for circuit 1, AL11 for circuit 2, AL12 for circuit 3 and AL13 for circuit 4 Reason for activation With unit running, if the value measured by the pressure probe is >=PAL11 Reset When the value measured by the pressure probe is <= (PAL11 - PAL12) Reset mode Automatic, and becomes manual after PAL13 occurrences/hour...
Page 176 3.4.3 Alarm for low difference between high and low pressure Checking of the difference between high and low pressure values takes place when at least one compressor of the circuit involved is running. The parameters involved are shown in the table. The values of the parameters are representative.
Page 177 3.4.4 Probe low pressure alarm For each refrigerant circuit, the suction pressure is controlled by a pressure sensor. The controlled limits are different with the different operating modes. If the value of parameter PAL5 is set to "1", pressure control is also done during defrost. If the value of parameter PAL7 is set to "1", pressure control is also done with the unit switched off.
Page 178 3.4.5 Forcing of capacity reduction from low pressure probe This function is always present in units with the value of parameter UN3 on "1". The parameters involved are shown in the table. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description...
Page 179 3.4.6 Forcing of capacity reduction from high pressure probe This function is always present in units with the value of parameter UN3 on "1". The parameters involved are shown in the table. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description...
Page 180 3.4.7 Low superheating alarm The alarm refers to the refrigerant circuits and its occurrence causes the relevant compressors to stop. The parameters involved are shown in the table. The values of the parameters are representative. In specific cases, different values can be set. Parameter Value Description...
Page 181 3.5 Compressor alarms The alarms of a compressor are: - compressor overload protection - compressor oil level - inverter offline - compressor operation outside envelope - inverter alarm. - compressor maintenance; 3.5.1 Compressor Overload Protection Alarm AL18, AL19, AL20, AL21, AL22, AL23, AL24, AL25, AL26, AL27, AL28, AL29, Alarm code AL30, AL31, AL32, AL33 The alarm is detected after the compressor is switched on...
Page 182 3.5.3 Inverter blocked alarm Alarm code AL309 General inverter alarm The alarm code is present in the "Trip Code" part of the inverter information screen Reason for activation This is detected through serial communication with the inverter Reset With elimination of the alarm on the inverter Automatic, with a number of occurrences per hour smaller than or equal to PAL23 Reset mode Manual, with a number of occurrences per hour greater than PAL23...
Page 183 3.5.5 Inverter offline alarm Alarm code AL166 compressor 1 inverter Reason for activation Disconnection of the serial connection with the inverter Reset Restoration of the serial connection Reset mode Automatic Alarm icon Flashing AlarmLog Devices Behaviour in the event of an alarm Compressor in alarm Always switched off Other compressors...
Page 184 3.6 Probe error alarms The temperatures and pressures that concern the management of the unit are measured through the analogue inputs of the controller. The software application manages the signals detected by the analogue inputs and checks that they fall within the set ope- rating range.
Page 185 User outlet water temperature probe error AL66 / AL266 for circuit 1, AL67 / AL267 for circuit 2, AL68 / AL268 for circuit Alarm code 3 and AL69 / AL269 for circuit 4 Reason for activation When the value measured by the analogue input is outside the set operating range Reset When the value measured by the analogue input falls within the set operating range Reset mode...
Page 186 System return water temperature probe error Alarm code AL81 Reason for activation When the value measured by the analogue input is outside the set operating range Reset When the value measured by the analogue input falls within the set operating range Reset mode Automatic Alarm icon...
Page 187 Suction temperature probe error AL102 for circuit 1, AL103 for circuit 2, AL104 for circuit 3 and AL105 for Alarm code circuit 4 Reason for activation When the value measured by the analogue input is outside the set operating range Reset When the value measured by the analogue input falls within the set operating range Reset mode...
Page 188 3.6.2 Pressure probes High pressure probe error Alarm code AL94 for circuit 1, AL95 for circuit 2, AL96 for circuit 3 and AL97 for circuit 4 Reason for activation When the value measured by the analogue input is outside the set operating range Reset When the value measured by the analogue input falls within the set operating range Reset mode...
Page 189 Pressure probe error in system delivery and return lines Alarm code AL323 system delivery line; AL324 system return line Reason for activation When the value measured by the analogue input is outside the set operating range Reset When the value measured by the analogue input falls within the set operating range Reset mode Automatic Alarm icon...
Page 190 Dynamic set point signal error Alarm code AL112 Reason for activation When the value measured by the analogue input is outside the set operating range Reset When the value measured by the analogue input falls within the set operating range Reset mode Automatic Alarm icon...
Page 191 3.7 System alarms The unit can be incorporated in a system where it is required to communicate with other controllers serially. Where communication problems occur, alarms are managed that vary according to the system type. 3.7.1 Alarms in Multilogic and Multifree systems The alarms linked to this function trigger whenever a problem is experienced with the Master setup parameters, the network communication, the status of the featured Slave units, and the additional probes connected to the Master.
Page 192 Configuration alarms ACF13 Multilogic network configuration alarm It is displayed in the Master when the priority level is not assigned correctly to the networ- Reason for activation ked units. Reset When the priority level is assigned correctly to the units of the network Reset mode Automatic Alarm icon...
Page 193 3.8 Configuration alarms The controller management software ensures that the configuration of the unit is consistent with that of the I/O and, in ge- neral, with the functions present. In the event of inconsistency, the controller reports the reason through codes. The codes managed with the descriptions of the causes generating them are shown in the table.
Page 194 4.1 Frequently Asked Questions The necessary instructions for working on the controller, with regard to the main functions of the unit, are given below. 4.2 Switching the unit on and off 4.2.1 Switch the unit on and off from the keypad In order to switch the unit on and off from the keypad, make sure the feature is active.
Page 195 4.3.3 Change of operating mode from heating to cooling and vice versa from the BMS The change of operating mode from the BMS is equivalent to the change from the keypad, and therefore it is an alternative to the change from digital input. In order to switch the unit on and off from the BMS, make sure the feature is active.
Page 196 4.4.7 Time band setup procedure A click on the “MENU” button in the main screen gives access to the “MENU” screen. Use the “arrow down” button to select “ENERGY SAVING” and press “ENTER” to confirm and thus access the menu with the function setup screens.
Page 197 4.5 Managing recovery 4.5.1 Activate and deactivate recovery from the keypad From the main screen, press button to move around in the recovery management screen. On pressing and holding down, for 2 seconds, button recovery will be deactivated. On pressing and holding down, for 2 seconds, button recovery will be activated.
Page 198 4.6 “ACS” management 4.6.1 Switch the “ACS” on and off using the keypad. To enable the “ACS” function using the controller, the operator has to go to the Home page and press button which gives access to the screen for function management. Once in the “ACS”...
Page 199 4.7 Management from BMS 4.7.1 RS485 serial connection The connection must be made through serial port “RS485 B” using terminals 97, 98 and 99, based on the indicated pola- rities. Terminal "99", marked with "gnd", should be used only if you are certain it is not earthed. The serial communication works even without its connection.
Page 200 4.7.4 Enable the change of operating mode from the BMS In heat pump units, for the change of operating mode from cooling to heating and vice versa from the BMS, besides setting parameter "SP6" to "1", as described in the previous point, it is necessary to also set parameter "SP9" to "0". Enabling of the change of operating mode from the BMS prevents the change of operating mode from digital input.
Page 201 4.8 Resetting of partial counters 4.8.1 Resetting the compressor hours of operation and starts The number of hours of operation of the compressors can be reset in the loop of screens dedicated to Service or in the Maintenance screens. For resetting in the Service branch, see the relevant "Compressors" chapter The "Maintenance"...
Page 202 4.8.3 Resetting of the number of hours of operation of the pumps The number of hours of operation of the pumps can be reset in the loop of screens dedicated to Service or in the Mainte- nance screens. For resetting in the Service branch, see the relevant "Pumps" chapter The "Maintenance"...
Page 203 4.9 Controller functions 4.9.1 Updating the time and date of the controller Since these updates require a reboot of the controller, the unit must be "OFF" in order to do them. From the main screen, press button MENU Pressing twice on the button select "CONFIG", confirm with button ENTER to enter the "Configuration"...
Page 204 4.10 Replacements 4.10.1 Replacing the electronic expansion valve driver To replace the driver, strictly follow the instructions given below. 1. Put the unit in the off state. 2. Turn off the power to the electrical control panel. 3. Disconnect and uninstall the old driver. 4.
Page 205 4.11 WEB pages The web server integrated in the controller is accessed through the Ethernet port. Access to these pages requires the user to know his/her IP address. The factory-set IP address is 10.2.3.20 The set IP address is in any case displayed in one of the controller screens. The steps to access the screen with the IP address are as follows: - go to the main screen and press the “menu”...
Page 206 4.12.1 The unit can be connected to Swegon INSIDE. All the units are supplied with an identification certificate “ID” which is required to connect them to Swegon INSIDE. The minimum conditions below must be checked for the connection of units manufactured before 2024 to Swegon INSIDE: - controller iPro, code MIDX125A or MIDX126A;...
Page 207 Swegon INSIDE portal is made within the validity term. if the connection to the Swegon INSIDE portal is not made within the validity term of the ID certificate, the certificate expires. We reserve the right to make changes without any prior notice.
Page 208 4.12.6 What to do if the ID certificate has expired or is missing If you need a new ID certificate, you have to access the Swegon portal - ref. section “How to access the Swegon INSIDE portal” - and click the link to ask for a new certificate.
Page 209 Select “Cooling & Heating” in the field “Select product”. Create your account and register at least one unit, after which access the “log in” screen in the Swegon INSIDE portal. We reserve the right to make changes without any prior notice.
Page 210 4.12.8 Information displayed in the Swegon INSIDE portal The “Products” menu in the Swegon INSIDE portal gives access to the associated units. The last registered operating status and active alarms, if any, are visible for units that have an active connection.
Page 211 Page intentionally blank We reserve the right to make changes without any prior notice. Translation from original instructions...
Page 212 Via Valletta, 5 - 30010 Cantarana di Cona, (VE) Italy - T. +39 0426 921111 - F. +39 0426 302222 www.blueboxcooling.com - info@swegon.it Swegon Operations s.r.l. with sole shareholder - VAT no. 02481290282 Company directed and coordinated by Investment Latour (Sweden)

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