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Identificazione: MD-AL-GI-00 
Rev. 4.0 del 31.01.18 - Applicazione: GID 

Manual of 07/06/2019 Rev. 1.1 “User Manual for 20K-33KTL” 

 

 

Figure 12 – Requirements for installing a single inverter 

 

 

Figure 13 – Requirements for installing multiple inverters 

Note:

 For safety reasons, ZCS Spa and/or its partners may not carry out any technical repairs or 

maintenance work, or move the inverter from and to the ground if it is installed at a height of more than 180 

cm from the ground. 
Inverters installed at higher heights must be moved to the ground before they can be repaired or serviced.  

 

 

Содержание 20000TL

Страница 1: ...81 REA AR 94189 Azienda Certificata ISO 9001 Certificato n 9151 CNS0 IT 17778 Zucchetti Centro Sistemi S p A Green Innovation Division Via Lungarno 248 52028 Terranuova Bracciolini Arezzo Italy tel 39 055 91971 fax 39 055 9197515 innovation zcscompany com zcs pec it www zcsazzurro com Grid connected inverter 20K 33K TL User Manual V1 1 07 06 2019 ...

Страница 2: ...ecks before installation 20 3 3 Installation tools 21 3 4 Installation position 23 3 5 Moving the 20K 33K TL inverter 25 3 6 Installing the 20K 33K TL inverter 26 4 Electrical connections 27 4 1 Electrical connections 27 4 2 PNGD Ground cable connections 28 4 3 Connecting the DC input power cables 29 4 4 Connecting the AC output power cables 33 4 5 Connecting the communication cables 36 5 Commissi...

Страница 3: ...azione GID Manual of 07 06 2019 Rev 1 1 User Manual for 20K 33KTL 7 1 Troubleshooting 65 7 2 Maintenance 72 8 Uninstalling 73 8 1 Steps for uninstalling the inverter 73 8 2 Packaging 73 8 3 Storage 73 8 4 Disposal 73 9 Technical specifications 74 10 Warranty 76 ...

Страница 4: ...quipment even when it is transferred to another user or plant Copyright statement The copyright of this manual belongs to Zucchetti Centro Sistemi S p A No part of this manual may be copied including the software reproduced or distributed in any form or by any means without the permission of Zucchetti Centro Sistemi S p A All rights reserved ZCS reserves the right to final interpretation This manu...

Страница 5: ...g up the inverter in the photovoltaic energy system and for operators of the photovoltaic system Symbols used This manual provides information for safe operation and uses certain symbols to ensure the safety of personnel and materials and for efficient use of the equipment during normal operation It is important to understand this information to avoid accidents and damage to property Please take n...

Страница 6: ...injury or damage Before installing and operating the equipment the electrical circuit of the strings must be disconnected by opening the string circuit breaker to interrupt the high voltage DC of the photovoltaic system Failure to do so could result in serious injury Qualified personnel Ensure that the operator has the necessary skills and training to operate the equipment Personnel responsible fo...

Страница 7: ...nnections Please pay attention to the electrical regulations on accident prevention when dealing with photovoltaic inverters Before connecting the mains power be sure to disconnect the photovoltaic modules by disconnecting all the DC switches of the generator When exposed to the sun the photovoltaic generator produces a voltage that can be dangerous Danger All installation operations must be carri...

Страница 8: ... in operation Wear protective gloves Attention Maintenance and repair Before carrying out any repairs disconnect the inverter from the mains network AC side and from the photovoltaic system DC side After switching off the AC and DC switches wait 5 minutes before carrying out any repairs or maintenance on the inverter Danger The inverter should start working again after any faults have been fixed F...

Страница 9: ... must be securely connected to the ground Attention Ensure the correct DC input voltage which must be below the maximum allowable DC voltage Overvoltage can cause permanent damage to the inverter or other faults which are not covered by the warranty Warning Symbols on the inverter Some safety symbols are located on the inverter Read and understand the contents of the symbols before installing the ...

Страница 10: ...ers are indicated in this section Description of functions It describes how the 20K 33K TL inverters and their internal operating modules work Efficiency curve It describes the efficiency curves of the inverter 2 1 Product description and dimensions Field of use The 20K 33KTL TL inverters are grid connected photovoltaic inverters equipped with a dual channel MPPT capable of converting the direct c...

Страница 11: ...dules can be connected to the input of the inverter do not connect batteries or other power supply sources A disconnecting switch must be installed between the inverter and the grid which must be sized for a maximum current of 63 A Intended networks The 20K 33KTL TL inverters are compatible with network configurations TN S TN C TN C S TT IT For the type of TT electrical grid the voltage between ne...

Страница 12: ...densation valve 2 DC switch 3 DC positive pole connectors 4 Wi Fi inlet 5 RS485 cable entry 6 AC cable entry 7 Cooling fans 8 DC negative pole connectors The inverter model must be chosen by a qualified technician who knows the installation conditions the devices that will be installed outdoors and the possible integration with existing systems Optional components of the inverter should be chosen ...

Страница 13: ...ev 4 0 del 31 01 18 Applicazione GID Manual of 07 06 2019 Rev 1 1 User Manual for 20K 33KTL Figure 5 Front side and back view of the inverter and bracket Labels on the inverter Figure 6 Do not remove the label on the side of the inverter ...

Страница 14: ...nents Operating principles The DC switch disconnects the internal circuits from the DC input for maintenance purposes The control board of the strings measures the input current and voltage analyses the functioning state of each PV string and if anomalies are found on the strings alerts the user to perform the relating control and maintenance operations Electromagnetic filters EMI at the input and...

Страница 15: ...15 74 Identificazione MD AL GI 00 Rev 4 0 del 31 01 18 Applicazione GID Manual of 07 06 2019 Rev 1 1 User Manual for 20K 33KTL Figure 7 Block diagram of the 20K 33KTL inverters ...

Страница 16: ...the amount of active power fed into the grid at the desired value expressed as a percentage To achieve this limitation it is necessary to use an external device Anti Reverse Power Controller not included with the inverter B 4 Automatic power reduction when grid is over frequency When the grid frequency exceeds the limit set the inverter reduces the power in order to ensure the stability of the gri...

Страница 17: ...gger the protection resulting in separation from the grid and shutdown of the operation C Grid monitoring Continuous monitoring of the grid voltage to ensure that the voltage and frequency values stay within the operating limits D Internal protection of the inverter device The inverter has all kinds of internal protections to protect the device and internal components when abnormal situations occu...

Страница 18: ...nual for 20K 33KTL Input voltage derating curve for an Azzurro ZCS 20K 33K TL inverter Figure 9 Input voltage derating curve for an Azzurro ZCS 20K 33 KTL inverter Output voltage derating curve for an Azzurro ZCS 20K 33K TL inverter Figure 10 Output voltage derating curve for an Azzurro ZCS 20K 33 TL inverter ...

Страница 19: ...n handling and transporting the inverter Choose an appropriate mounting position and surface Assign at least two people to install the inverter Attention 3 1 Installation process This section describes the process for installing the 20K 33K TL inverter 3 2 Checks before installation This section describes the checks to carry out on the outer packaging on the inverter and its components 3 3 Install...

Страница 20: ...erials from the box 24 hours before installing the inverter Checking the product After removing the inverter from its packaging check that the product is intact and complete If any damage is found or components are missing contact the supplier and transport company Contents of the packaging Carefully check the contents of the packaging before installation making sure that no element inside the pac...

Страница 21: ...No Tool Function 1 Drill Recommended drill bit 8 mm To drill holes in the wall for fixing the bracket 2 Screwdriver To screw and unscrew screws for the various connections 3 Wire stripper To prepare the cables for wiring 5 Adjustable spanner opening greater than 32 mm To tighten the bolts 6 4 mm Allen key 6 mm Allen key To screw the inverter to the wall mounting bracket and to open the front cover...

Страница 22: ...tors from the inverter 11 Diagonal pliers To cut and tighten the cable ends 12 Cable stripping tool To remove the outer sheath of the cables 13 RJ45 2 pieces 14 Cable cutter To cut the power cables 15 Crimping tool To crimp the power cables 16 Multi meter To check the voltage and current values 17 Marking pen To mark the wall for better fixing precision 18 Measuring tape To measure distances 19 Le...

Страница 23: ... 1 1 User Manual for 20K 33KTL 20 ESD gloves Protective clothing 21 Safety goggles Protective clothing 22 Protection mask Protective clothing 3 4 Installation position Choose an appropriate installation location for the inverter Follow the requirements below to determine the installation position ...

Страница 24: ...Figure 13 Requirements for installing multiple inverters Note For safety reasons ZCS Spa and or its partners may not carry out any technical repairs or maintenance work or move the inverter from and to the ground if it is installed at a height of more than 180 cm from the ground Inverters installed at higher heights must be moved to the ground before they can be repaired or serviced ...

Страница 25: ...ple and the correct handling of the inverter Figure 14 Removing the polystyrene protections Figure 15 Removing the inverter from its packaging 2 Lift the inverter from its packing box and move it to the installation position To prevent damage and personal injury hold the inverter firmly when moving as it is a heavy piece of equipment Do not position the inverter with the input output terminals in ...

Страница 26: ...ring drilling it is necessary to reposition the holes 2 Insert the plugs horizontally into the holes made paying attention to the force and depth with which they are inserted make sure the plug completely enters the hole 3 Align the mounting bracket with the position of the holes and fix it to the wall using the most suitable screws and flat washers tightening them properly 4 Place the inverter on...

Страница 27: ...ximum open circuit voltage of the photovoltaic string must be less than 1000 V The 20K 33K TL inverters have two maximum power point markers MPPT All the photovoltaic modules connected in series to the same MPPT must be of the same model and brand so as to have the same rated electrical characteristics Isc Voc Im Vm Pm and temperature coefficients they must have the same number of photovoltaic mod...

Страница 28: ...rwise the inverter may fail All non current carrying metal parts such as the PV module frame PV rack housing of the combiner box and housing of the inverter in the PV power system must be connected to the ground Attention Note Connect the PGND cable before connecting the AC DC power and communication cables For systems with one inverter connect the PGND cable to the ground For systems with multipl...

Страница 29: ... crimp them using a crimping tool as shown in figure 19 Note 1 L3 is the length between the insulation layer of the ground cable and the crimped part L4 is the distance between the crimped part and the conductor wires protruding from the crimped part Note 2 The cavity formed after the conductor has been crimped must completely wrap the conductor wires The core of the wire must be in close contact ...

Страница 30: ... 3 Note Depending on the type of inverter select the appropriate accessories cables fuse holder fuse switch etc The open circuit voltage of the photovoltaic system must be lower than the maximum allowable DC input voltage of the inverter Model 20 KTL 25 KTL 30 KTL 33 KTL Voltage range per MPPT 230 960 V DC 230 960 V DC 230 960 V DC 230 960 V DC Maximum input voltage 1000 V DC The positive and nega...

Страница 31: ...to the sun the photovoltaic generator produces a voltage that can be dangerous Before connecting the power supply make sure that the voltage of the DC cables is within the permissible operating range below 60 V DC and that the DC circuit breaker switch is open Otherwise the high voltage may cause serious damage Danger If the 20 33K TL inverter is connected directly to the grid make sure that the P...

Страница 32: ...ith the positive and negative connectors respectively Separate the positive and negative metal terminals after unpacking the inverter so as to avoid confusing the polarities Procedure 1 Remove the cable glands from the positive and negative connectors 2 Remove an appropriate length of the insulation layer from the positive and negative power cables by using a wire stripper as shown in the figure F...

Страница 33: ...til you hear a click sound At that point the power cables will be snapped into place 6 Replace the cable glands on the positive and negative connectors and rotate them against the insulation covers 7 Insert the positive and negative connectors into the corresponding DC input terminals of the inverter until you hear a click sound as shown in the figure Figure 25 Connecting the DC input power cables...

Страница 34: ...In Italy each grid connected photovoltaic system with a power output of more than 11 08 kW must be equipped with an external interface device SPI Warning Context All the AC power cables used for the inverter must be 5 pole outdoor cables For easier installation use flexible cables The table lists the recommended specifications for cables and circuit breakers Type 20 KTL 25 KTL 30 KTL 33 KTL Cable ...

Страница 35: ...een the power loss in the cable its length and the cross section area Cross section of the cable mm2 Maximum length m 20 KTL 25 KTL 30 KTL 33 KTL 10 34 34 27 27 The 20K 33K TL inverters are three phase output inverters that comply fully with the local grid connection requirements and safety standards The inverters are equipped with AC output connectors with IP66 protection suitable for photovoltai...

Страница 36: ...se S cable to the terminal labelled S tighten the wire using a screwdriver Connect the phase T cable to the terminal labelled T tighten the wire using a screwdriver Connect the blue neutral cable to the terminal labelled N tighten the wire using a screwdriver Figure 30 Connecting the AC output cables 3 4 Secure the clamping cable gland by turning it clockwise make sure that all the wires are secur...

Страница 37: ...ut as shown in the figure below Figure 32 Connector for communication via 485 port When passing the communication cables make sure that they are separated from the power cables and away from sources of interference so as to prevent any interruptions in the communication Procedure 1 Remove an appropriate length of the outer insulation layer of the shielded network cable using a wire stripper 2 Open...

Страница 38: ... 34 Assembling the communication connector Removal procedure Remove the RJ45 connector from the inverter by removing the plug Then press the clip on the RJ45 connector and pull out the RJ45 connector Communication via Wi Fi connection To allow the inverter to communicate via Wi Fi it is necessary to equip the machine with a special Wi Fi adapter To use the Wi Fi Communication connect the inverter ...

Страница 39: ...er Manual for 20K 33KTL 2 Connect the external Wi Fi module 3 Fix the external Wi Fi module using the two screws supplied Note follow the appropriate procedure to configure the external Wi Fi adapter Description of the communication ports This section describes the functions of the RS485 and Wi Fi ports ...

Страница 40: ...verter and data logger terminal Note in the case of a single inverter connected via RS485 or in the case of the last inverter in a daisy chain of multiple inverters connected via RS485 configure the insulation resistance using the SWT2 switches following the indications shown in the table below O OFF 1 ON and in the figure below SWT2_1 SWT2_2 Status ON OFF Connected OFF OFF Not connected If the sy...

Страница 41: ...ld be remembered that it is always necessary to provide technical support with the serial number of the inverter and the Wi Fi adapter to allow remote monitoring via the application or website This information can be sent by email to service inverter zcscompany com WI FI GPRS Through the interface it is possible to transfer information regarding the power produced the alarms and the operating stat...

Страница 42: ...these inverters Refer to section 6 3 for setting the Modbus address Note 4 If multiple inverters are connected to the system s monitoring device via a single RS485 RS232 converter or to the same S WE01S data logger a maximum of 31 inverters can be connected in a daisy chain The 20K 33K TL inverters have a multi function relay whose output can be configured The communication terminal is found on th...

Страница 43: ... for 20K 33KTL Connecting the relay cable Procedure 1 Prepare the appropriate cable Remove the insulating sheath as shown in the figure below then pass the cable through the waterproof nut 2 Insert the sealing cap and tighten the nut 3 Connect the stripped cable into the appropriate terminal of the terminal block ...

Страница 44: ...that all the photovoltaic strings are securely connected to the input of the inverter AC connection Make sure that the AC switch of the inverter is off Check that the phases of the inverter are correctly connected to the grid R S T N PE Check that the type of AC grid in which the inverter is installed is correct TN C TN S TT Check that the voltage of each phase is within the correct range If possi...

Страница 45: ...ors of the 20 33K TL inverters 6 1 Operating panel and display Buttons and LED indicators Figure 37 LCD display with buttons and LED indicators Main buttons Menu Back to go back or enter the main menu Up to go up or increase the value by 1 Down to go down or decrease the value by 1 OK Enter to confirm the selection and enter the menus Indicator lights Status light GREEN o Flashing wait or status c...

Страница 46: ...e power output of the inverter the input information coming from the PV system information relating to errors etc Figure 39 Indicators in the main interface A1 Modbus communication address A2 RS485 Communication A3 Steady light for active RS485 communication A4 Wi Fi Communication A5 Flashing light to indicate over frequency and power derating status Steady light to indicate remote control A6 Indi...

Страница 47: ... should the other grid parameters otherwise the inverter will go into an error state Check inverter is checking the insulation resistance relays and other safety requirements It also runs a self test to ensure that the software and hardware of the inverter are functional The inverter switches to the error state or permanent error state if an errors occur Normal The inverter is functioning normally...

Страница 48: ... press OK to enter the menu for setting the date time First set the date and then the time using the Up and Down keys then press OK to move to the next character and confirm The date and time are expressed in the format 20YY MM DD HH MM SS The date and time are expressed in the format 20YY MM DD HH MM SS The display will show OK if the setting is correct and Error in case of an error The date and ...

Страница 49: ...l Set Country Select 4 Set Country and press OK to enter the menu for setting the national grid connection regulations If Setting Disabled appears on the display go to step 6 Enable Country to enable this function After enabling the function repeat the steps described above and set the code for the desired country using the Up and Down keys confirming with OK the display will show OK if the settin...

Страница 50: ...ction 2 Alarm 3 ConfigAlarm 4 Disab Relay Below is a detailed definition of the configurations that can be set Production The relay changes over whenever it detects a connection to or disconnection from the grid If the relay contact is normally open or closed the relay will remain open or closed until the inverter is connected to the grid when the inverter connects to the grid and starts feeding p...

Страница 51: ...oduced by the system before installing the current inverter which is visible from the main interface Modbus address Select 9 ModBusAddress and press OK to enter the menu for selecting the communication address Use the Up and Down keys to select the number and OK to move to the next one and confirm After setting the address press OK The Modbus address indicates the address with which the inverter s...

Страница 52: ...om Zucchetti Centro Sistemi Spa technical support Select 13 Safety V and press OK to enter the menu for setting the protection voltage The display will show Enter PWD press OK to enter the password Enter the password 0001 using the Up and Down keys to select the number and OK to move to the next one and confirm If the display shows Incorrect try again press the Back key and enter the password agai...

Страница 53: ... the display shows Incorrect try again press the Back key and enter the password again When the password has been entered correctly you can enter the menu Now you can use the Up and Down keys to select the 1 Enable or 2 Disable option and select it with the OK key If the 1 Enable option is selected you will be able to use the Up and Down keys to select the options Under excited Grid Manager and Ov...

Страница 54: ...sensors as described in the appropriate procedure This device can be purchased from suppliers of photovoltaic materials The size of the inverter and power value you wish to feed into the grid must be specified at the time of purchase MPPT Scan Select 21 MPPT Scan and press OK to enter the relative menu from which you can enable the MPPT Scan function i e the possibility to set the periodic search ...

Страница 55: ...4 81 S1Check and press OK to enter the relative menu from which it will be possible to enable the frequency restriction thresholds required in special cases by local regulations With the Up and Down keys you can set the 1 Enable 81 S1 and 2 Disable 81 S1 option and select it with the OK key The display will show OK if the setting is successful Fast self test 1 During normal operation of the invert...

Страница 56: ...56 74 Identificazione MD AL GI 00 Rev 4 0 del 31 01 18 Applicazione GID Manual of 07 06 2019 Rev 1 1 User Manual for 20K 33KTL ...

Страница 57: ...l operation of the inverter press the Back key to enter the main menu 2 Press the OK key to enter the Settings menu 3 Press the Down key several times until 26 Standard Self Test is shown on the screen 4 Press OK to start the self test 5 The self test will now start automatically once completed press Down to display the self test results as shown in the figure ...

Страница 58: ...58 74 Identificazione MD AL GI 00 Rev 4 0 del 31 01 18 Applicazione GID Manual of 07 06 2019 Rev 1 1 User Manual for 20K 33KTL ...

Страница 59: ... user can access this interface from the LCD display to check the details of the alarms and alerts Errors will be listed according to the date and time they occurred so the most recent events will be listed first For more information refer to the figure below Press the Back key on the main interface and then the Down key then enter the 2 Event List menu From here you can select the 1 Current Event...

Страница 60: ...country code that has been set Input Use the Up and Down keys in the System Info menu to move and the OK key to enter the 6 Input menu Here you can see the type of input of the photovoltaic strings AC Thresholds Use the Up and Down keys in the System Info menu to move and the OK key to enter the 7 AC Thresholds menu Here you can see the value of the voltage and frequency thresholds for the relay t...

Страница 61: ... next digit and confirm If the display shows Incorrect try again press the Back key and enter the password again When the password has been entered correctly you can enter the menu and start updating the firmware Note You can check the firmware version currently installed on the inverter from the Service Code submenu found in the System Info menu IMPORTANT Do not perform any update operation if th...

Страница 62: ...e update 9 The update process will take about 3 minutes and will run automatically The following indications will be followed a DSP1 Update b DSP2 Update c ARM Update 10 Check that the inverter completes the update correctly and that INITIALIZING appears on the display the inverter will then start normally If the update was not successful one of the following messages will appear on the display CO...

Страница 63: ... Follow the steps below to display the recorded alarms Press Menu Back to enter the main menu from the standard interface Select Event List in the menu screen then press OK to access the list of alarms and errors Information on event list Error code Error name Error description Possible solution ID01 GridOVP The grid voltage is too high If the alarm occurs occasionally the probable cause is that t...

Страница 64: ...rect adjustment Check whether too many photovoltaic modules have been connected in series in a PV string the voltage Voc of the PV string is therefore higher than the maximum input voltage of the inverter In this case adjust the number of photovoltaic modules mounted in series to decrease the voltage of the PV string so that it falls within the input voltage range of the inverter The inverter auto...

Страница 65: ... and has caused the hardware protection to be activated ID15 ID24 are internal faults of the inverter turn off the DC switch wait 5 minutes and then turn it back on again Check that the fault is no longer present If this is not the case contact Technical Support ID16 AcRmsOCP The grid current is too high ID17 HwADFaultIGrid Sampling error of the grid current ID18 HwADFaultDCI DCI sampling error ID...

Страница 66: ...rrect change it according to Section 6 3 A 10 Configuration of the Input Mode of this manual ID29 SwOCPInstant The grid current is too high Internal faults of the inverter turn off the DC switch wait 5 minutes and then turn it back on again Check that the fault is no longer present If this is not the case contact Technical Support ID30 SwBOCPInstant The input current is too high Check whether the ...

Страница 67: ...een the photovoltaic string and the ground in the event of a short circuit rectify the fault ID57 OverTempFault_Inv The temperature of the inverter is too high Check that the installation position and the installation method meet the requirements of Section 3 4 of this user manual Check if the ambient temperature in the installation location exceeds the allowed limit If so improve the ventilation ...

Страница 68: ...reparable fault ID71 UnrecoverPvConfigSetWrong Incorrect input mode Check the configuration of the input mode parallel mode independent mode of the inverter as indicated in Section 6 3 C 6 Input Mode of this user manual If it is not correct change it according to Section 6 3 A ID72 ID73 Reserved Reserved Reserved ID74 UnrecoverIPVInstant The input current is too high and has caused an irreparable ...

Страница 69: ...eOff The inverter was turned off by remote control The inverter registers ID 84 in case of remote shutdown operation Check the wiring of the remote input and the port of the output control signal on the communication board according to section 4 5 of this user manual ID85 UnderFreqDerating The inverter has been derated because the grid current is too low The inverter automatically reduces the outp...

Страница 70: ...ccording to Section 6 3 A 4 Configuration of country code of this manual ID98 MicroSD card fault The microSD card is faulty or a false contact has occurred Replace the SD card ID99 ID100 Reserved Reserved Reserved 7 2 Maintenance Inverters generally do not require daily or routine maintenance In any case for proper long term operation of the inverter make sure that the heatsink for cooling the inv...

Страница 71: ...strings by opening the DC circuit breaker Wait 5 minutes Remove the DC connectors Remove the AC terminals Unscrew the fixing bolt of the bracket and remove the inverter from the wall 8 2 Packaging If possible pack the inverter in its original packaging 8 3 Storage Store the inverter in a dry place where the ambient temperature is between 25 and 60 C 8 4 Disposal At the end of its life dispose of t...

Страница 72: ...W 25000W 30000W 33000W Maximum AC power 22000VA 27500VA 33000VA 36300VA Maximum AC current 32A 40A 48A 53A Rated AC voltage 3F N PE 230 400V 20 Rated AC voltage range 180V 270V According to local grid standards Grid frequency 50 60 Hz According to local grid standards Grid frequency range 45 53Hz 57 63 Hz According to local grid standards Active power adjustable range 0 100 Total harmonic current ...

Страница 73: ... Communication Communication interface Wi Fi optional RS485 proprietary protocol microSD card Additional inputs I O inputs for connection to anti reverse power controller Data storage 25 years General information Ambient temperature 25 C 60 C Topology Transformerless Degree of protection IP65 Relative humidity 0 95 Non condensing Maximum operating altitude 2000m Acoustic emission 30dB 1m 45dB 1m W...

Страница 74: ...ees normal operation of the inverter If the inverter is defective or faulty during the warranty period contact your installer or supplier If the fault falls within the responsibility of the manufacturer Zucchetti Centro Sistemi S p A will provide service and maintenance free of charge Warranty exclusions Use of the 20K 33K TL inverters for any other purpose than the intended one Defective or fault...

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