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REMKO RXT Series Operating And Installation Instructions

Wall and ceiling chests for cooling and heating
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Operating and
installation instructions
REMKO RXT series
Wall and ceiling chests for cooling and heating
RXT 525 DC, RXT 685 DC, RXT 1055 DC, RXT 1405 DC
0217-2021-07 Edition 2, en_GB
Read the instructions prior to performing any task!

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  • Page 1 Operating and installation instructions REMKO RXT series Wall and ceiling chests for cooling and heating RXT 525 DC, RXT 685 DC, RXT 1055 DC, RXT 1405 DC 0217-2021-07 Edition 2, en_GB Read the instructions prior to performing any task!
  • 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- Refrigerant prints! Translation of the original...

  • 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....................... 6 1.6 Safety instructions for the operator....................6 1.7 Safety notes for installation, maintenance and inspection .............
  • Page 4 REMKO RXT series Commissioning........................... 43 Shut-down............................44 Troubleshooting, customer service and fault analysis..............45 12.1 Troubleshooting and customer service..................45 12.2 Indoor unit fault analysis......................48 12.3 Resistances of the temperature probes..................59 Care and maintenance........................62 Exploded view and spare parts lists....................64 14.1 Exploded view - Indoor unit RXT 525-685 DC ................

  • Page 5: Safety And Usage Instructions

    Safety and usage instructions DANGER! This combination of symbol and signal word 1.1 General safety notes warns of a situation in which there is immediate danger, which if not avoided may be fatal or Carefully read the operating manual before com- cause serious injury.

  • Page 6: Safety-Conscious Working

    REMKO RXT series In particular, failure to observe the safety notes All housing parts and unit openings, e.g. air may pose the following risks: inlets and outlets, must be kept clear. The units must be inspected by a service tech- The failure of important unit functions.

  • Page 7: Unauthorised Modification And Changes

    "certificate of warranty" to The setup, connection and operation of the REMKO GmbH & Co. KG at the time when the units and its components must be undertaken units are purchased and commissioned.

  • Page 8: Environmental Protection And Recycling

    REMKO RXT series 1.12 Environmental protection and recycling Disposal of packaging All products are packed for transport in environ- mentally friendly materials. Make a valuable contri- bution to reducing waste and sustaining raw mate- rials. Only dispose of packaging at approved collection points.

  • Page 9: Technical Data

    Technical data 2.1 Unit data Series RXT 525 DC RXT 685 DC RXT 1055 DC RXT 1405 DC Inverter wall/ceiling-mounted room air conditioner combination Operating mode for cooling and heating 5,30 7,00 10,60 14,10 Nominal cooling output (2,70-5,90) (2,70-7,70) (2,70-11,80) (3,50-15,20) Energy efficiency ratio SEER Power consumption,...
  • Page 10 REMKO RXT series RXT 525 DC RXT 685 DC RXT 1055 DC RXT 1405 DC Data specific to indoor unit Power supply V/Ph/Hz 230/1~/50 Application area (room vol.) approx. Adjustment range °C +17 to +30 room temperature °C/ Operating range...
  • Page 11 RXT 525 DC RXT 685 DC RXT 1055 DC RXT 1405 DC Data specific to outdoor unit Power supply V/Ph/Hz 230/1~/50 400/3~/50 Operating range, cooling °C +5 to +50 Operating range, heating °C +5 to +24 Air flow rate, max. 2000 2700 4000...

  • Page 12: Unit Dimensions

    REMKO RXT series 2.2 Unit dimensions Outdoor units Fig. 1: Dimensions RXT 525-1405 DC AT (all measurements in mm) Measurements (mm) RXT 525 DC AT RXT 685 DC AT RXT 1055 DC AT RXT 1405 DC AT 1333 Indoor units Fig.

  • Page 13: 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 14: Operation

    REMKO RXT series 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 15: Display On Indoor Unit

    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 16: Keys On The Remote Control

    17 °C. “Follow me” function ( ) - Network configuration ( “Fresh” key - “Follow me” function ( ) Activates/deactivates the REMKO BioClean func- The selected function flashes in the display, con- tion (ionisation). firm with the “OK” key.
  • Page 17 “Clean” key Time-delayed switch-on active. Activates/deactivates the self-cleaning function of the unit (available depending on the unit model). Time-delayed switch-off active. “LED” key Silent mode active. Enables switching on/off the unit lighting and the signal tones (depending on the unit). Fan speed Displays the set fan speed as follows: Indicators on the LCD...
  • Page 18 REMKO RXT series Temperature setting Cooling mode The temperature setting can be made within a Press the “Mode” key and activate the “Cool” range of 17-30 °C. The setpoint is adjusted in 1 °C function. steps. Set the desired temperature using the “Λ ”...
  • Page 19 Timer function Time-delayed switch-off With the “Timer” function, the unit can switch on Press the “Timer” key to enter the “Time with a switch-on delay or switch off with a switch- OFF” setting off delay. Use the arrow keys to select the desired number of hours after which the air condi- Time-delayed switch-on tioning unit is to switch off...
  • Page 20 REMKO RXT series Combining time-delayed switching on and off 14.00 15.00 15.30 16.00 17.00 18.00 13.00 Fig. 14: Combining time-delayed switching on and off 1: Timer starts a: current (13:00) 2: Unit switches on b: 2.5 hours later 3: Unit switches off c: 5 hours later Example: If both timers are activated at 13:00, the unit switches on 2.5 hours later (at 15:30) and switches off...
  • Page 21 Deactivate lighting and signal tones Frost protection function Press the “LED” key to switch the unit lighting The air conditioning unit operates at high fan on and off. speed with a fixed setpoint of 8 °C (only available in heating mode). Press and hold the “LED”...
  • Page 22 REMKO RXT series Self-cleaning function “Turbo” function Press the “Clean” key (not available on all unit models). If the “Turbo” key is pressed in cooling mode, the unit operates with the highest possible cooling Due to the formation of condensate on the heat...
  • Page 23 AP mode (network configuration) Not available for all unit types and can only be used in combination with the optional REMKO WifiStick. AP mode can be activated by pressing the “LED” key several times within 10 seconds. The unit is now in net- work configuration mode.

  • Page 24: Installation Instructions For Qualified Personnel

    REMKO RXT series Installation instructions for qualified personnel 5.1 Important notes 5.2 Selection of installation prior to installation location 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 25: Installation Materials

    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 26: Wall Openings

    REMKO RXT series 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 27: Fastening Options For The Indoor Unit

    5.5 Fastening options for the indoor unit If wall-mounted, the indoor units are mounted with fastening hooks and hanger bolts, and if ceiling-mounted then with fastening hooks and threaded rods. Fig. 30: Unit fastening with threaded rod 1: Unit mount 4: Washer 2: Threaded rod M10 5: Vibration damper (optional)
  • Page 28 REMKO RXT series Fig. 32: Unit fastening without housing 1: Unit mount 3: Side part 2: Hanger bolts or threaded rods 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 525-1405 DC AT Fig.

  • Page 30: Installation

    REMKO RXT series 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...
  • Page 31 The following instructions describe the installation of the cooling cycle and the assembly of the indoor unit and the outdoor unit. Label the refrigerant piping (injection and suc- The required pipe diameters are given in the tion pipes) as well as the associated electrical table "Technical data".

  • Page 32: Additional Notes On Connecting The Refrigerant Piping

    REMKO RXT series Fig. 38: Flanging the refrigerant piping 1: Flanging tool Fig. 40: Tightening the fitting 1: Tighten with the first open-ended spanner 2: Counter with the second open-ended spanner Pipe dimension in Tightening torque in Nm inches 1/4"...

  • Page 33: Leak Testing

    6.5 Leak testing 6.6 Adding refrigerant Once all the connections have been made, the The units contain a basic quantity of refrigerant. In pressure gauge station is attached to the Schrader addition, an additional amount of refrigerant must valve as follows (if fitted): be added for refrigerant piping lengths exceeding 5 metres per circuit.

  • Page 34: Condensate Drainage Connection And Safe Drainage

    REMKO RXT series Condensate drainage The condensate drainage line should have an incline of min. 2%. This is the responsibility of connection and safe the customer. If necessary, fit vapour-diffusion- drainage proof insulation. When operating the unit at outside tempera- tures below 4 °C, ensure the condensate...
  • Page 35 Safe drainage in the event of leakages The REMKO oil separator OA 2.2 fulfils the fol- lowing list of requirements from regional regula- tions and laws. NOTICE! Local regulations or environmental laws, for example the German Water Resource Law (WHG), can require suitable precautions to pro-...

  • Page 36: Electrical Wiring

    REMKO RXT series Electrical wiring 8.1 General notes Make the connection as follows: The connection terminal block is located on A mains cable must be installed as the power the right inside the unit (Fig. 44). supply to the outdoor unit and a control line to the indoor unit, with appropriate protection.

  • Page 37: Outdoor Unit Connection

    8.3 Outdoor unit connection Fix the line in the strain relief and re- assemble the unit. Proceed as follows to connect the line: Remove the side-panel cover. Choose the cable cross-section in accord- ance with the relevant specifications. Connect the lines as shown on the electrical connection diagram.
  • Page 38 REMKO RXT series Connection RXT 1055-1405 DC 1(L) 2(N) 1(L) 2(N) S 400V/3~/50 Hz Fig. 47: Electrical wiring diagram A: Outdoor unit RXT 1055-1405 DC AT Power supply cable B: Indoor unit RXT 1055-1405 DC IT 2: Communication lines...

  • Page 39: Electrical Drawings

    8.5 Electrical drawings Indoor units RXT 525-1405 DC IT FA N1 DC MOTOR CON2 DRIVER MODLE DC FAN CON1 REACTOR ALARM ON/OFF CN34 CN15 CN43 CN23 CN33 CN13 WIRE DISPLAY CN10 CONTROLLER BOARD WHITE WHITE (GRAY) BLACK BROWN CN45 CN40 HB HA MAGNETIC RING...
  • Page 40 REMKO RXT series Outdoor unit RXT 525 DC AT 1(L) 2(N) S CN 1A CN 60 CN 17 CN 9 CN 32 CN 15 CN 30 CN 29 CN 25 CN 28 2/3/4/5 CN 7 CN 21 CN 31 Fig. 49: Electrical drawings...
  • Page 41 Outdoor unit RXT 685 DC AT 1(L) 2(N) S CN 3 CN 60 CN 16 CN 21 CN 19 CN 5 2/3/4/5 CN 414 CN 17 CN 18 Fig. 50: Electrical drawings A: Control board AC fan Compressor Electronic E-valve Connecting line to the indoor unit 10: DC fan motor Power supply...
  • Page 42 REMKO RXT series Outdoor unit RXT 1055-1405 DC AT Fig. 51: Electrical drawings A: Control board Crankcase heating B: Inverter board 4-way reversing valve Klixon 10: Communication line to indoor unit Low pressure switch 11: Power supply cable High pressure switch...

  • Page 43: Before Commissioning

    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 44: Shut-Down

    REMKO GmbH & Co. KGor 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 45: Troubleshooting, Customer Service And Fault Analysis

    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 46 REMKO RXT series 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.
  • Page 47 Malfunction indicated by flashing code RXT 525-1405 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 Evaporator temperature probe faulty No cooling capacity after 30 minutes Condensate pump liquid level switch triggered...

  • Page 48: Indoor Unit Fault Analysis

    REMKO RXT series Probe resistance Indoor unit probe, evaporator; indoor unit probe, ambient air Temperature [°C] Resistance [kW] 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...
  • Page 49 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 50 REMKO RXT series 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...
  • Page 51 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 52 REMKO RXT series 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 53 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. Cause: Electrical connection faulty Temperature probe defective...
  • Page 54 REMKO RXT series 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.
  • Page 55 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 Compressor defective Check the connecting cables between the con- Establish a correct connection between the trol board and compressor? Are they faulty?
  • Page 56 REMKO RXT series 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 57 Error code: P2 (with units with a thermal contact) Reason: If the test voltage of the thermal contact does not lie at 5 V, then the display shows the error message “P2” Cause: Faulty supply voltage Refrigerant low or cooling circuit blocked Faulty control board Check the air flow volumes of the...
  • Page 58 REMKO RXT series 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...

  • Page 59: Resistances Of The Temperature Probes

    12.3 Resistances of the Temp. Resistance Temp. Resistance temperature probes (°C) (kW) (°C) (kW) 4.39 1.21 Probe T1, T2, T3 and T4 4.21 1.17 Temp. Resistance Temp. Resistance (°C) (kW) (°C) (kW) 4.05 1.14 115.27 18.72 3.89 1.10 108.15 17.80 3.73 1.06 101.52...
  • Page 60 REMKO RXT series Temp. Resistance Temp. Resistance Temp. Resistance Temp. Resistance (°C) (kW) (°C) (kW) (°C) (kW) (°C) (kW) 0.42 0.30 82.54 18.96 0.41 0.29 78.79 18.26 0.40 0.28 75.24 17.58 0.39 0.28 71.86 16.94 0.38 0.27 68.66 16.32 0.37 0.26...
  • Page 61 Temp. Resistance Temp. Resistance (°C) (kW) (°C) (kW) 5.66 2.86 5.49 2.78 5.32 2.70 5.16 2.63 5.00 2.56 4.85 2.49 4.70 2.42 4.56 2.36 4.43 2.29 4.29 2.23 4.17 2.17 4.05 2.12 3.93 2.06 3.81 2.01 3.70 1.96 3.60 1.91 3.49 1.86 3.39...

  • Page 62: Care And Maintenance

    REMKO RXT series 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 63 Cleaning the filter Disconnect the power supply to the unit. Open the front side of the unit by folding the grill down/forwards (Fig. 54). Pull the filter out in an upwards direction (Fig. 54). Clean the filter with a commercially available vacuum cleaner.

  • Page 64: Exploded View And Spare Parts Lists

    REMKO RXT series Exploded view and spare parts lists 14.1 Exploded view - Indoor unit RXT 525-685 DC Fig. 57: Exploded view of the unit RXT 525-685 DC IT We reserve the right to modify the dimensions and design as part of the ongoing technical development...

  • Page 65: Spare Parts List - Indoor Unit Rxt 525-685 Dc

    14.2 Spare parts list - Indoor unit RXT 525-685 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 66: Exploded View - Indoor Unit Rxt 1055-1405 Dc

    REMKO RXT series 14.3 Exploded view - Indoor unit RXT 1055-1405 DC Fig. 58: Exploded view of the unit RXT 1055-1405 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 1055-1405 Dc

    14.4 Spare parts list - Indoor unit RXT 1055-1405 DC No. Designation Air inlet grill (large) Air inlet grill (small) Front panel Evaporator Temperature probe, evaporator Side covering, left Wall bracket, left Fan wheel Fastening protection Display board Air filter (large) Air filter (small) Air outlet fins Housing...

  • Page 68: Exploded View - Outdoor Unit Rxt 525 Dc

    REMKO RXT series 14.5 Exploded view - Outdoor unit RXT 525 DC Fig. 59: Exploded view of the unit RXT 525 DC AT We reserve the right to modify the dimensions and design as part of the ongoing technical development...

  • Page 69: Spare Parts List - Outdoor Unit Rxt 525 Dc

    14.6 Spare parts list - Outdoor unit RXT 525 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 70: Exploded View - Outdoor Unit Rxt 685 Dc

    REMKO RXT series 14.7 Exploded view - Outdoor unit RXT 685 DC Fig. 60: Exploded view of the unit RXT 685 DC AT We reserve the right to modify the dimensions and design as part of the ongoing technical development...

  • Page 71: Spare Parts List - Outdoor Unit Rxt 685 Dc

    14.8 Spare parts list - Outdoor unit RXT 685 DC No. Designation Cover panel Protection grid, front wall Front panel Fan blade Fan motor Fan motor mounting plate Corner panel, left Condenser Air inlet temperature probe Electronic injection valve Shut-off valve, injection pipe 4-way reversing valve Shut-off valve, suction pipe Partitioning panel...

  • Page 72: Exploded View - Outdoor Unit Rxt 1055 Dc

    REMKO RXT series 14.9 Exploded view - Outdoor unit RXT 1055 DC 11 12 Fig. 61: Exploded view of the unit RXT 1055 DC AT We reserve the right to modify the dimensions and design as part of the ongoing technical development...

  • Page 73: Spare Parts List - Outdoor Unit Rxt 1055 Dc

    14.10 Spare parts list - Outdoor unit RXT 1055 DC No. Designation Cover panel Protection grid, front wall Front panel Fan blade Fan motor Fan motor mounting plate Side panel, left Recessed grip side panel, left Temperature probe for condenser outlet Temperature probe for condenser outlet Temperature probe for heat gas line Air inlet temperature probe...

  • Page 74: Exploded View - Outdoor Unit Rxt 1405 Dc

    REMKO RXT series 14.11 Exploded view - Outdoor unit RXT 1405 DC 11 12 Fig. 62: Exploded view of the unit RXT 1405 DC AT We reserve the right to modify the dimensions and design as part of the ongoing technical development...

  • Page 75: Spare Parts List - Outdoor Unit Rxt 1405 Dc

    14.12 Spare parts list - Outdoor unit RXT 1405 DC No. Designation Cover panel Protection grid, front wall Front panel Fan blade Fan motor Fan motor mounting plate Side panel, left Condenser 4-way reversing valve Shut-off valve, suction pipe Partitioning panel Shut-off valve, injection pipe Air inlet temperature probe Temperature probe for condenser outlet...

  • Page 76: Index

    REMKO RXT series Index Assembly Oil return measures ..... . 29 Strip foundation ..... . 34 Ordering spare parts .
  • Page 78 REMKO RXT series...
  • Page 80 REMKO QUALITY WITH SYSTEMS Air-Conditioning | Heating | New Energies Telephone +49 (0) 5232 606-0 REMKO GmbH & Co. KG Hotline within Germany +49 (0) 5232 606-0 Klima- und Wärmetechnik Telefax +49 (0) 5232 606-260 Im Seelenkamp 12 E-mail info@remko.de...

This manual is also suitable for:

Rxt 525 dcRxt 685 dcRxt 1055 dcRxt 1405 dc

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