REMKO SKT Series Operating And Installation Instructions
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REMKO SKT Series Operating And Installation Instructions

Multisplit air-conditioning systems for cooling and heating, indoor unit
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Operating and
installation instructions
REMKO SKT series
Multisplit air-conditioning systems for cooling and heating
Indoor unit
SKT 261
0244-2019-12 Edition 1, en_GB
Read the instructions prior to performing any task!

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  • Page 1 Operating and installation instructions REMKO SKT series Multisplit air-conditioning systems for cooling and heating Indoor unit SKT 261 0244-2019-12 Edition 1, 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 SKT series General view of unit and spare parts....................51 Index..............................53...

  • 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 SKT 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 SKT 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 SKT 261 Design-Wall unit for inverter multisplit out- Operating mode door units for cooling and heating Nominal cooling output Nominal heat capacity Application area (room volume), approx. Adjustment range room temperature °C +17 to +30 Operating range °C/r.H.% +17 to +32 / 35 to 65...

  • Page 10: Unit Dimensions

    REMKO SKT series 2.2 Unit dimensions Fig. 1: Dimensions SKT 261 IT Measurements (mm) SKT 261 IT We reserve the right to modify the dimensions and design as part of the ongoing technical development process.

  • Page 11: Design And Function

    The indoor unit consists of a fin evaporator, evapo- rator fan, controller and condensate tray. The 1: Evaporator indoor unit can be combined with REMKO outdoor 2: Evaporator fan units from the series SKT ...AT that provide suffi- 3: Suction pipe connection cient cooling capacity.

  • Page 12: Operation

    REMKO SKT series Operation 4.1 General notes Alarms are indicated by a code (see chapter The indoor unit is easily operated using the Troubleshooting and customer service). standard infrared remote control. The indoor unit beeps to acknowledge the correct transmission of data.

  • Page 13: Keys On The Remote Control

    4.3 Keys on the remote control "SLEEP" key Activates/deactivates the "SLEEP" function. Pressing this key will automatically increase or decrease the target temperature by 1 °C within an hour in cooling and heating mode respectively. Press this key to maintain the most convenient temperature and save energy.
  • Page 14 REMKO SKT series "TIMER ON" key Indicators on the LCD This key initiates the automatic switch-on time for the unit. Each press of this key increases the delay time by 30 minutes. When the set time on the dis- play exceeds 10.0, each press of the button increases the set time by 60 minutes.
  • Page 15 "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 16 REMKO SKT series "Dehumidification" mode "Timer" mode Make sure that the indoor unit is connected to the Press the "TIMER ON" key to set the "Auto on" power supply, and is switched on. time and the "TIMER OFF" key to set the "Auto off"...
  • Page 17 Setting the "Auto off" time Example TIMER function settings Press the "TIMER OFF" key. The remote "TIMER ON" (Auto on mode) control shows "TIMER OFF", the last "Auto Example: off" time setting and the symbol "H" appears on the display. The unit is now ready to reset You want the air conditioning unit to switch on six the "Auto off"...
  • Page 18 REMKO SKT series 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 19 SLEEP function The sleep function saves energy while you sleep. This function is activated by pressing the key on the remote control. Press the key before going to sleep. In cooling mode, the unit automatically increases the set room temperature by 1 °C after 1 hour.

  • Page 20: Installation Instructions For Qualified Personnel

    REMKO SKT series Installation instructions for qualified personnel 5.1 Important notes prior to instal- 5.2 Installation materials lation The indoor unit is attached to the wall by a wall bracket and 4 screws (to be provided by the cus- Observe the operating manuals for the indoor unit tomer).

  • Page 21: Minimum Clearances

    5.4 Minimum clearances Observe the minimum clearances to allow access for maintenance and repair work and facilitate optimum air distribution. 1600 Fig. 18: Minimum clearances 1: Air inlet 2: Air outlet 5.5 Connection variants for the indoor unit The following connection variants can be used for the refrigerant, condensate and control lines. Fig.

  • Page 22: Connection Of The Indoor Unit When The Refrigerant Piping Is Installed Under The Plaster

    REMKO SKT series 5.6 Connection of the indoor unit when the refrigerant piping is installed under the plaster If the customer routes the refrigerant piping to the unit underneath the plaster, observe the following note. The principal connection options can be found in the "Connection variants for the indoor unit" and "Wall bracket"...

  • Page 23: Wall Bracket

    5.7 Wall bracket Fig. 21: Wall bracket for indoor unit SKT 261 IT (rear view) Measurements (mm) SKT 261 We reserve the right to modify the dimensions and design as part of the ongoing technical development process.

  • Page 24: Installation

    REMKO SKT series Installation NOTICE! Unit installation The unit is factory filled with dry nitrogen for leak testing purposes. The pressurised nitrogen NOTICE! is released when the union nuts are undone. Installation should only be performed by author- ised specialists.

  • Page 25: Condensate Drainage Connection And Safe Drainage

    Condensate drainage Safe drainage in the event of leakages connection and safe The REMKO oil separator OA 2.2 fulfils the fol- lowing list of requirements from regional regula- drainage tions and laws. Condensate drainage connection Due to the dew point shortfall on the evaporator,...

  • Page 26: Electrical Wiring

    REMKO SKT series Electrical wiring 8.1 General notes A protected power supply cable is to be connected to the outdoor unit and a four-core control line with a minimum cross-section of 1.5 mm . To avoid EMC interference, only use shielded cable for this purpose and connect the shielding on both sides.

  • Page 27: Electrical Wiring Diagram

    8.2 Electrical wiring diagram Connection SKT 521-1061 L(1) 2(N) S L(1) 2(N) S L(A) N(A) S(A) L(B) N(B) S(B) 230V/1~/50 Hz L(C) N(C) S(C) L(1) 2(N) S Fig. 25: Electrical wiring diagram Outdoor unit SKT 521-1061 AT Power supply : Indoor units SKT 261 IT Communication lines...

  • Page 28: Electrical Drawings

    REMKO SKT series 8.3 Electrical drawings SKT 261 IT Weiß/ White Rot/ Blau/ Yellow/ Blue Gelb W 1(L) 2(N) S N-IN Cn31 Fig. 26: Electrical drawings A: Control board 3: Fin motor, vertical B: Display circuit board 4: Fin motor, horizontal...

  • Page 29: Connection Of A Superordinate Controller Provided By The Customer

    8.4 Connection of a superordinate The multifunction board is equipped with a total of 5 terminals (see Fig. 30), with which the following controller provided by the customer functions can be realised: Units of type SKT can be switched on and off by a superordinate controller.
  • Page 30 REMKO SKT series Connection of a cable remote control with week Rotary DIP switch Address program (MCC-1 controller): switch For the electrical power supply, it is neces- sary to provide a power supply of 230V/1~/50 0-15 Hz at the MCC-1 controller. This is connected to the L, N, PE terminals.

  • Page 31: Commissioning

    Commissioning NOTICE! Check that the shut-off valves and valve caps NOTICE! are tight after carrying out any work on the Commissioning should only be performed by cooling cycle. Use appropriate sealant products specially trained personnel and documented as necessary. after the certificate has been issued. Observe the operating manuals for the indoor unit and outdoor unit when commissioning the entire system.

  • Page 32: Troubleshooting And Customer Service

    REMKO SKT series Troubleshooting and customer service 10.1 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 alarms should occur, please check the functions as detailed in the list below.
  • Page 33 Malfunction Possible causes Checks Remedial measures Windows and doors Have structural / usage Close windows and open. Heating / cooling modifications been doors / install additional load has increased made? units Cooling mode is not set Does the cooling symbol Correct the settings for appear on the display? the unit...

  • Page 34: Indoor Unit Fault Analysis

    REMKO SKT series Fault display on the indoor unit Display Error description EEPROM error, indoor unit Communication error between indoor unit and outdoor unit Fan speed control indoor unit disabled Room temperature probe T1 defective Temperature probe, evaporator T2 defective...
  • Page 35 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 36 REMKO SKT 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 37 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 38 REMKO SKT 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 39 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 40 REMKO SKT 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 41 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 42 REMKO SKT 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 43 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 Faulty control board Check the air flow volumes of the...
  • Page 44 REMKO SKT 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 45: Resistances Of The Temperature Probes

    10.3 Resistances of the Temp. Resistance Temp. Resistance temperature probes (°C) (kW) (°C) (kW) 4.39 1.21 Probe T1, T2, T3, T4 and T2B 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...
  • Page 46 REMKO SKT 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 47 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 48: Care And Maintenance

    REMKO SKT series Care and maintenance Maintenance It is recommended that you take out a mainte- Regular care and observation of some basic points nance contract with an annual service from an will ensure trouble-free operation and a long appropriate specialist firm.
  • Page 49 Cleaning the housing Disconnect the power supply to the unit. Open and fold the air inlet grill on the front side upwards. Clean the grill and cover with a soft, damp cloth. Switch the power supply back on. Air filter for indoor unit Clean the air filter at intervals of no more than 2 Fig.

  • Page 50: Shut-Down

    REMKO GmbH & Co. KG or your contractual partner will be pleased to provide a list of certified firms near you.
  • Page 51 General view of unit and spare parts Exploded view of the unit SKT 261 IT Fig. 38: Exploded view of the unit We reserve the right to modify the dimensions and design as part of the ongoing technical development process.
  • Page 52 REMKO SKT series Spare parts list SKT 261 IT IMPORTANT! To ensure the correct delivery of spare parts, please always the device type with the corresponding serial number (see type plate) No. Designation Unit trim Air filter, single Circuit board, display...
  • Page 53 Index Alarms Ordering spare parts ..... 52 Checks ......32 Possible causes .
  • Page 54 REMKO SKT series...
  • Page 56 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...

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