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REMKO RXT 523 DC Assembly And Operating Instructions Manual

Remko rxt...dc inverter wall/ceiling-mounted unit with split design
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Assembly and operating instructions
REMKO RXT...DC
RXT 523 DC, RXT 683 DC, RXT 1053 DC, RXT 1403 DC
Inverter wall/ceiling-mounted unit with split design
Read the instructions prior to performing any task!
0138-2016-06 Edition 1, en_GB

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Summary of Contents for REMKO RXT 523 DC

  • Page 1 Assembly and operating instructions REMKO RXT...DC RXT 523 DC, RXT 683 DC, RXT 1053 DC, RXT 1403 DC Inverter wall/ceiling-mounted unit with split design Read the instructions prior to performing any task! 0138-2016-06 Edition 1, en_GB...
  • Page 2 Read these operating instructions carefully before commis- sioning / using this device! These instructions are an integral part of the system and must always be kept near or on the device. Subject to modifications; No liability accepted for errors or mis- prints! Installation and operating instructions (translation of the orig- inal)

  • Page 3: Table Of Contents

    Table of contents Safety and usage instructions......................5 1.1 General safety notes........................5 1.2 Identification of notes........................5 1.3 Personnel qualifications........................5 1.4 Dangers of failure to observe the safety notes................5 1.5 Safety-conscious working....................... 5 1.6 Safety notes for the operator......................6 1.7 Safety notes for installation, maintenance and inspection..............
  • Page 4 14.3 Exploded view - Indoor unit RXT 1053-1403 DC ............... 68 14.4 Spare parts list - Indoor unit RXT 1053-1403 DC............... 69 14.5 Exploded view - Outdoor unit RXT 523 DC ................71 14.6 Spare parts list - Outdoor unit RXT 523 DC................72 14.7 Exploded view - Outdoor unit RXT 683 DC ................

  • Page 5: Safety And Usage Instructions

    Safety and usage instructions CAUTION! This combination of symbol and signal word 1.1 General safety notes warns of a potentially hazardous situation, which if not avoided may cause injury or mate- Carefully read the operating manual before com- rial and environmental damage. missioning the units for the first time.

  • Page 6: Safety Notes For The Operator

    "certificate of warranty" to conditions stipulated in this manual and comply REMKO GmbH & Co. KG at the time when the with all applicable regional regulations. units are purchased and commissioned.

  • Page 7: Transport And Packaging

    1.11 Transport and packaging The devices are supplied in a sturdy shipping con- tainer. Please check the equipment immediately upon delivery and note any damage or missing parts on the delivery and inform the shipper and your contractual partner. For later complaints can not be guaranteed.

  • Page 8: Technical Data

    REMKO RXT...DC Technical data 2.1 Unit data Series RXT 523 DC RXT 683 DC RXT 1053 DC RXT 1403 DC Inverter wall/ceiling-mounted room air conditioner combination Operating mode for cooling and heating 5.30 7.10 10.50 14.00 Nominal cooling output (0.80-6.20) (1.20-8.20)
  • Page 9 RXT 523 DC RXT 683 DC RXT 1053 DC RXT 1403 DC Data specific to indoor unit V/Ph/ Power supply 230 / 1~ / 50 Application area (room vol.) approx. Adjustment range room °C +17 to +30 temperature °C/ Operating range...
  • Page 10 REMKO RXT...DC RXT 523 DC RXT 683 DC RXT 1053 DC RXT 1403 DC Data specific to outdoor unit V/Ph/ Power supply 230 / 1~ / 50 400 / 3~ /50 Operating range, cooling °C +5 to +50 Operating range, heating °C...

  • Page 11: Unit Dimensions

    2.2 Unit dimensions Outdoor units Fig. 1: Dimensions RXT 523-1403 DC AT (all measurements in mm) Measurements (mm) RXT 523 DC AT RXT 683 DC AT RXT 1053 DC AT RXT 1403 DC AT 1333 Indoor units Fig. 2: Unit dimensions, indoor unit RXT 523-1403 DC IT...

  • Page 12: Performance Curves For Heating And Cooling

    1,50 1,00 0,50 0,00 [°C] Fig. 3: Performance curves, heating RXT 523 DC (data for room temperature FK 27 °C/TK 20°C) A: Outside temperature 2: Heating capacity in kW 1: COP 3: Power consumption in kW Outside temperature in °C Heating capacity in kW 3.34...
  • Page 13 Heating capacity RXT 683 DC 8,50 8,00 7,50 7,00 6,50 6,00 5,50 5,00 4,50 4,00 3,50 3,00 2,50 2,00 1,50 1,00 0,50 0,00 [°C] Fig. 5: Performance curves, heating RXT 683 DC (data for room temperature FK 27 °C/TK 20°C) A: Outside temperature 2: Heating capacity in kW 1: COP...
  • Page 14 REMKO RXT...DC Heating capacity RXT 1053 DC 13,00 12,50 12,00 11,50 11,00 10,50 10,00 9,50 9,00 8,50 8,00 7,50 7,00 6,50 6,00 5,50 5,00 4,50 4,00 3,50 3,00 2,50 2,00 1,50 1,00 0,50 0,00 [°C] Fig. 7: Performance curves, heating RXT 1053 DC (data for room temperature FK 27 °C/TK 20°C)
  • Page 15 Heating capacity RXT 1403 DC 19,00 18,50 18,00 17,50 17,00 16,50 16,00 15,50 15,00 14,50 14,00 13,50 13,00 12,50 12,00 11,50 11,00 10,50 10,00 9,50 9,00 8,50 8,00 7,50 7,00 6,50 6,00 5,50 5,00 4,50 4,00 3,50 3,00 2,50 2,00 1,50 1,00 0,50...

  • Page 16: Design And Function

    3.1 Unit description available as accessories. Refrigerant piping is used to connect the indoor The RXT room air conditioners have a REMKO unit to the outdoor unit. RXT...DC AT outdoor unit as well as a RXT...DC IT indoor unit.

  • Page 17: Operation

    Operation 4.1 General notes The indoor unit is easily operated using the standard infrared remote control. The indoor unit beeps to acknowledge the correct transmission of data. If it is not possible to program the indoor unit with the remote control, then it can also be man- ually operated.

  • Page 18: Display On Indoor Unit

    REMKO RXT...DC 4.2 Display on indoor unit Wired remote control Connection of the optional wired remote control Display on indoor unit The plug for connection of a wired remote The LED indicators illuminate to indicate the set- control is located behind the panel at the dis- tings: play board (Fig.

  • Page 19: Keys On The Remote Control

    4.3 Keys on the remote control “FRESH” key (no function) "TURBO" key Activation of the turbo function makes it possible to reach the setpoint in cooling or heating mode as fast as possible. “SELF CLEAN” key (no function) “ARROW UP” and “ARROW DOWN” keys “ARROW UP”...
  • Page 20 REMKO RXT...DC "FOLLOW ME" key Indicators on the LCD This key can be used to activate/deactivate the FOLLOW ME function. In this mode, the room tem- perature is measured on the remote control. This sends a signal to the indoor unit every 3 minutes. If...
  • Page 21 "Cooling", "Heating" and "Recirculation" mode Make sure that the indoor unit is connected to the power supply, and is switched on. The illustration of the LCD with all of the sym- bols present is only intended to provide a Press the "MODE" key to select from oper- clearer overview.
  • Page 22 REMKO RXT...DC "Dehumidification" mode "Timer" mode Make sure that the indoor unit is connected to the Press the "TIMER ON" key to set the "switch-on power supply, and is switched on. time" and the "TIMER OFF" key to set the "switch- off"...
  • Page 23 Setting the “switch-off time” Example TIMER function settings Press the "TIMER OFF" key. The remote "TIMER ON" (Auto on mode) control shows "TIMER OFF", the last "switch- Example: off time" setting and the symbol "H" appear on the display. The unit is now ready to reset You want the air conditioning unit to switch on 2 the "switch-off time"...
  • Page 24 REMKO RXT...DC Combined TIMER (setting "TIMER ON" and "TIMER ON ð "TIMER OFF" "TIMER OFF" at the same time) (Off ð Start ð Stop) "TIMER OFF ð "TIMER ON" Example: (On ð Stop ð Start) You want the air conditioning unit to switch on in...

  • Page 25: Installation Instructions For Qualified Personnel

    Installation instructions for qualified personnel 5.1 Important notes prior to instal- 5.2 Selection of installation loca- lation tion Transport the unit in its original packaging as Indoor unit close as possible to the installation location. The indoor unit is designed for horizontal wall You avoid transport damage by doing so.

  • Page 26: Installation Materials

    REMKO RXT...DC Wind If the unit is being installed in windy areas, ensure that the warm outlet air is discharged in the pre- vailing wind direction. If this is not the possible, it may be necessary to install a windbreak (to be pro- vided by the customer).

  • Page 27: Wall Openings

    5.4 Wall openings A wall opening of at least 70 mm diameter and 10 mm incline from the inside to the outside must be created. To prevent damage to the lines, the interior of the wall opening should be padded or, for example, lined with PVC pipe (see figure).
  • Page 28 REMKO RXT...DC Fig. 33: Unit fastening 1: Unit mount Fig. 34: Unit fastening without housing 1: Unit mount 2: Hanger bolts or threaded rods 3: Side part 4: Air inlet grill...

  • Page 29: Minimum Clearances

    5.6 Minimum clearances 5.7 Connection variants Observe the minimum clearances to allow access The following connection variants can be used for for maintenance and repair work and facilitate the refrigerant, condensate and control lines. optimum air distribution. Minimum clearances, outdoor units RXT 523-1403 DC AT Fig.

  • Page 30: Installation

    REMKO RXT...DC Installation Ceiling installation The unit is attached by means of the integrated 6.1 Preparations for installation ceiling bracket, taking account of the air outlet side located on the front of the unit. Removing the air inlet grill Mark the mounting points on the structurally...

  • Page 31: Connection Of Refrigerant Piping

    6.3 Connection of The following instructions describe the installation of the cooling cycle and the assembly of the indoor refrigerant piping unit and the outdoor unit. The refrigerant piping is connected on the back The required pipe diameters are given in the side of the units.
  • Page 32 REMKO RXT...DC Label the refrigerant piping (injection and suc- tion pipes) as well as the associated electrical control lines of each interior unit with a letter. Only connect the lines to their associated con- nections. NOTICE! Always pay attention to the affiliation of the...

  • Page 33: Additional Notes On Connecting The Refrigerant Piping

    6.5 Leak testing Once all the connections have been made, the pressure gauge station is attached to the Schrader valve as follows (if fitted): red = small valve = high pressure blue = large valve = suction pressure Once the connection has been made successfully, the leak test is carried out with dry nitrogen.

  • Page 34: Adding Refrigerant

    REMKO RXT...DC 6.6 Adding refrigerant Condensate drainage connection and safe The units contain a basic quantity of refrigerant. In addition, an additional amount of refrigerant must drainage be added for refrigerant piping lengths exceeding 5 metres per circuit. Refer to the following chart:...
  • Page 35 1200 Fig. 46: Condensate drainage connection IT on the ceiling Safe drainage in the event of leakages The REMKO oil separator OA 2.2 fulfils the fol- lowing list of requirements from regional regula- Condensate drainage connection tions and laws. If the temperature falls below the dew point, con- densation will form on the finned condenser during heating mode.

  • Page 36: Electrical Wiring

    REMKO RXT...DC Electrical wiring 8.1 General notes 8.2 Connecting the indoor unit A mains cable must be installed as the power The unit requires a six-wired control line from the supply to the outdoor unit and a control line to the indoor unit to the outdoor unit.

  • Page 37: Outdoor Unit Connection

    L(A) N L(L1) N(L2) S(1) S(B) N(B) L(B) 230V/1~/50 Hz Fig. 49: Electrical wiring diagram A: Outdoor unit RXT 523 DC AT B: Indoor unit RXT 523 DC IT 1: Power supply 2: Communication lines 3: Optional connection MCC-1 controller...
  • Page 38 REMKO RXT...DC Connection RXT 683 DC L(L1) N(L2) 1(L) 2(N) L 230V/1~/50 Hz Fig. 50: Electrical wiring diagram A: Outdoor unit RXT 683 DC AT B: Indoor unit RXT 683 DC IT 1: Power supply 2: Communication lines 3: Optional connection MCC-1 controller...
  • Page 39 Connection RXT 1053-1403 DC (1)L (2)N L(L1) N(L2) 400V/3~/50 Hz Fig. 51: Electrical wiring diagram A: Outdoor unit RXT 1053-1403 DC AT B: Indoor unit RXT 1053-1403 DC IT 1: Power supply 2: Communication lines 3: Optional connection MCC-1 controller...

  • Page 40: Electrical Drawings

    REMKO RXT...DC 8.5 Electrical drawings Indoor units RXT 523-683 DC IT weiss weiss weiss weiss weiss weiss weiss weiss CN25 CN18 CN21 CN22 CN24 CN14 CN11 CN13 CN10(CN10A) schwarz CN26 weiss CN19 CN16 schwarz (blau) rot (braun) L(L1) N(L2) S1 S2...
  • Page 41 Indoor units RXT 1053-1403 DC IT CN18 CN21 CN22 CN24 CN14 CN11 CN13 CN10(CN10A) schwarz CN26 weiss Cn29 Cn28 L(L1) N(L2) S1 S2 Fig. 53: Electrical drawings RXT 1053-1403 DC IT A: Control board Transformer B: Display circuit board Fin motors DC fan motors Condensate pump connection (optional) Potential-free external contact on/off...
  • Page 42 CN 21 CN 7 VALVE-B CN 31 grün/gelb Fig. 54: Electrical drawings main and inverter board RXT 523 DC AT A: Control board Supply line to indoor unit B: Auxiliary circuit board Power supply Compressor Temperature probe for heat gas line...
  • Page 43 Outdoor unit RXT 683 DC AT rot (braun) blau gelb CN14 CN12 CN29 L-OUT ON(4) COM(3) VALVE-A blau blau CN14 L-IN N-IN CN28 4-WAY HEAT1 HEAT2 CN1 CN2 CN6 CN5 CN9 CN8 schwarz gelb grau grün/gelb schwarz Fig. 55: Electrical drawings main and inverter board RXT 683 DC AT A: Control board Transformer B: Inverter board...
  • Page 44 REMKO RXT...DC Outdoor unit RXT 1053 DC AT U V W blau blau schwarz schwarz blau CN13 weiss weiss blau blau CN11 CN35 CN34 schwarz CN30 schwarz L1’ L2’ L3’ CAP1 CN31 orange CN28 orange HEAT_Y orange HEAT_D CN27 orange...
  • Page 45 Outdoor unit RXT 1403 DC AT grün/gelb grün/gelb grün/gelb weiss blau schwarz blau orange orange schwarz blau blau grün/gelb gelb grau Fig. 57: Electrical drawings main and inverter board RXT 1403 DC AT A: Control board Transformer B: Power pcb 10: Power supply C: Control board DC fan motor (optional) 11: Supply line to indoor unit...

  • Page 46: Before Commissioning

    REMKO RXT...DC Before commissioning Commissioning After leak testing has been successfully com- pleted, connect the vacuum pump via the pressure NOTICE! gauge station to the valve connections on the out- door unit (see chapter "Leak testing") and create a Commissioning should only be performed by vacuum.

  • Page 47: Shut-Down

    REMKO GmbH & Co. KG or your contractual report. Check the correct function and set- partner will be pleased to provide a list of certified tings of all regulation, control and safety firms near you.

  • Page 48: Troubleshooting, Customer Service And Fault Analysis

    REMKO RXT...DC Troubleshooting, customer service and fault analysis 12.1 Troubleshooting and customer service The unit and components are manufactured using state-of-the-art production methods and tested several times to verify their correct function. However, if malfunctions should occur, please check the functions as detailed in the list below.
  • Page 49 Malfunction Possible causes Checks Remedial measures Filter is dirty / air inlet / Have the filters been Clean the filters outlet opening is blocked cleaned? by debris Windows and doors Have structural / usage Close windows and open. Heating / cooling modifications been doors / install additional load has increased...
  • Page 50 REMKO RXT...DC Malfunction indicated by flashing code RXT 523-1403 DC Number of flashes Error Error description LED timer code second) EEPROM error, indoor unit Communication error between indoor unit and outdoor unit Evaporator fan motor speed control not OK Room air temperature probe faulty...

  • Page 51: Indoor Unit Fault Analysis

    Probe resistance Indoor unit probe, evaporator; indoor unit probe, ambient air Temperature Resistance [kW] [°C] 35.20 26.88 20.72 16.12 12.64 10.00 7.97 6.40 12.2 Indoor unit fault analysis Error code: E0 / F4 Reason: The control board of the outdoor unit or indoor unit cannot read the unit memory (EEPROM) Cause: Installation error...
  • Page 52 REMKO RXT...DC Error code: Reason: The indoor unit does not receive a signal from the outdoor unit within 110 seconds Cause: Electrical connection not configured correctly Control boards outdoor unit or indoor unit defective Switch off voltage, switch on again 2 minutes later.
  • Page 53 Error code: E3 / F5 Reason: If the fan speed of the indoor unit/outdoor unit falls below 300 rpm, the unit switches off and the display shows error code E3 or E5 Cause: Electrical connection faulty Evaporator fan wheel defective Evaporator fan motor defective Control board faulty Switch off voltage, switch on again 2...
  • Page 54 REMKO RXT...DC Procedure DC fan motor of the indoor unit (control chip is installed in the motor): Switch on the voltage to the unit. In standby mode, measure the unit between terminals 1-3 and 4-3 of the connector plug. Check the measured values against those listed in the table below. If these differ, there is a problem with the control board and it must be replaced.
  • Page 55 Error code: Reason: The evaporator probe T2 measures the actual value with the compressor start and takes this as the reference value T . If, 5 minutes after the compressor start, the value T Start Start has not dropped by 2 °C for at least 4 seconds then the system assumes that the refrig- erant is low.
  • Page 56 REMKO RXT...DC Error code: E4 / E5 / F1 / F2 / F3 Reason: If the test voltage of the probes is lower than 0.06 V or higher than 4.94 V then the display shows the error code of the corresponding probe.
  • Page 57 Error code: Reason: Safety shutdown due to overly high current consumption of individual unit components Cause: Faulty power supply Cooling circuit blocked Faulty control board Electrical connections faulty Compressor defective Switch the unit off and ensure correct supply Check the supply voltage. Is this correct? voltage.
  • Page 58 REMKO RXT...DC Error code: Reason: If the power supply to the compressor controller is faulty, the display shows the error code “P0” and the unit switches off Cause: Electrical connection faulty Faulty control board Condenser fan motor defective or blocked...
  • Page 59 Error code: Reason: Overvoltage or undervoltage protection has tripped Cause: Faulty supply voltage Refrigerant low or cooling circuit blocked Faulty control board Check the power supply. Is the supply voltage Switch the unit off and have the power supply correct? checked/corrected.
  • Page 60 REMKO RXT...DC Error code: P2 (with units with a thermal contact) Reason: If the test voltage of the thermal contact does not lie at 5V then the display shows the error message “P2” Cause: Faulty supply voltage Refrigerant low or cooling circuit blocked...
  • Page 61 Error code: Reason: Safety shutdown of inverter controller. Internal system monitoring triggered (e.g. communi- cation problem between board and compressor, the compressor speed is not OK) Cause: Faulty electrical connections Inverter regulation on board defective Condenser fan motor defective Compressor defective Control board defective Check the electrical connection between the control board and compressor.
  • Page 62 REMKO RXT...DC Resistance values for probes T1, T2, T3 and T4 K Ohm K Ohm K Ohm K Ohm...
  • Page 63 Resistance values for probe T5 K Ohm K Ohm K Ohm K Ohm...

  • Page 64: Care And Maintenance

    REMKO RXT...DC Care and maintenance Regular care and observation of some basic points will ensure trouble-free operation and a long This enables you to ensure the operational reli- service life. ability of the plant at all times! For systems which operate year-round (e.g. in...
  • Page 65 Cleaning the filter Disconnect the power supply to the unit. Open the front side of the unit by folding the grill down/forwards (Fig. 61). Pull the filter out in an upwards direction (Fig. 61). Clean the filter with a commercially available vacuum cleaner.

  • Page 66: Exploded View And Spare Parts Lists

    REMKO RXT...DC Exploded view and spare parts lists 14.1 Exploded view - Indoor unit RXT 523-683 DC Fig. 64: Exploded view of the unit RXT 523-683 DC IT We reserve the right to modify the dimensions and design as part of the ongoing technical development...

  • Page 67: Spare Parts List - Indoor Unit Rxt 523-683 Dc

    14.2 Spare parts list - Indoor unit RXT 523-683 DC IMPORTANT! To ensure the correct delivery of spare parts, please always the device type with the corresponding serial number (see type plate) No. Designation Air inlet grill Front panel Evaporator Temperature probe, evaporator Side covering, left Wall bracket, left...

  • Page 68: Exploded View - Indoor Unit Rxt 1053-1403 Dc

    REMKO RXT...DC 14.3 Exploded view - Indoor unit RXT 1053-1403 DC Fig. 65: Exploded view of the unit RXT 1053-1403 DC IT We reserve the right to modify the dimensions and design as part of the ongoing technical development process.

  • Page 69: Spare Parts List - Indoor Unit Rxt 1053-1403 Dc

    14.4 Spare parts list - Indoor unit RXT 1053-1403 DC IMPORTANT! To ensure the correct delivery of spare parts, please always the device type with the corresponding serial number (see type plate) No. Designation Air inlet grill (large) Air inlet grill (small) Front panel Evaporator Temperature probe, evaporator...
  • Page 70 REMKO RXT...DC No. Designation Cooling fin Fin motor Refrigerant connections cover...

  • Page 71: Exploded View - Outdoor Unit Rxt 523 Dc

    14.5 Exploded view - Outdoor unit RXT 523 DC Fig. 66: Exploded view of the unit RXT 523 DC AT We reserve the right to modify the dimensions and design as part of the ongoing technical development process.

  • Page 72: Spare Parts List - Outdoor Unit Rxt 523 Dc

    REMKO RXT...DC 14.6 Spare parts list - Outdoor unit RXT 523 DC IMPORTANT! To ensure the correct delivery of spare parts, please always the device type with the corresponding serial number (see type plate) No. Designation Cover panel Protection grid, front wall...

  • Page 73: Exploded View - Outdoor Unit Rxt 683 Dc

    14.7 Exploded view - Outdoor unit RXT 683 DC Fig. 67: Exploded view of the unit RXT 683 DC AT We reserve the right to modify the dimensions and design as part of the ongoing technical development process.

  • Page 74: Spare Parts List - Outdoor Unit Rxt 683 Dc

    REMKO RXT...DC 14.8 Spare parts list - Outdoor unit RXT 683 DC IMPORTANT! To ensure the correct delivery of spare parts, please always the device type with the corresponding serial number (see type plate) No. Designation Cover panel Protection grid, front wall...

  • Page 75: Exploded View - Outdoor Unit Rxt 1053 Dc

    14.9 Exploded view - Outdoor unit RXT 1053 DC 11 12 Fig. 68: Exploded view of the unit RXT 1053 DC AT We reserve the right to modify the dimensions and design as part of the ongoing technical development process.

  • Page 76: Spare Parts List - Outdoor Unit Rxt 1053 Dc

    REMKO RXT...DC 14.10 Spare parts list - Outdoor unit RXT 1053 DC IMPORTANT! To ensure the correct delivery of spare parts, please always the device type with the corresponding serial number (see type plate) No. Designation Cover panel Protection grid, front wall...
  • Page 77 No. Designation Shut-off valve mounting plate Condensate tray heating Crankcase heating...

  • Page 78: Exploded View - Outdoor Unit Rxt 1403 Dc

    REMKO RXT...DC 14.11 Exploded view - Outdoor unit RXT 1403 DC 11 12 Fig. 69: Exploded view of the unit RXT 1403 DC AT We reserve the right to modify the dimensions and design as part of the ongoing technical development...

  • Page 79: Spare Parts List - Outdoor Unit Rxt 1403 Dc

    14.12 Spare parts list - Outdoor unit RXT 1403 DC IMPORTANT! To ensure the correct delivery of spare parts, please always the device type with the corresponding serial number (see type plate) No. Designation Cover panel Protection grid, front wall Front panel Fan blade Fan motor...
  • Page 80 REMKO RXT...DC No. Designation Crankcase heating Terminal block cover Side panel, right...

  • Page 81: Index

    Index Minimum clearances ..... 29 Assembly Strip foundation ..... . 34 Oil return measures .
  • Page 82 REMKO RXT...DC...
  • Page 84 SFlb Customer Service Our equipment operates precisely and reliably. However, in the event of a fault, REMKO customer service is quickly at the scene. Our comprehensive network of experienced dealers always guarantees quick and REMKO GmbH & Co. KG reliable service.

This manual is also suitable for:

Rxt 1403 dcRxt 683 dcRxt 1053 dc

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