REMKO ML Series Operating And Installation Instructions
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REMKO ML Series Operating And Installation Instructions

Wall mounted units in split design
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Operating and
installation instructions
REMKO ML series
Wall mounted units in split design
ML 265 DC, ML 355 DC, ML 525 DC, ML 685 DC
0245-2020-01 Edition 1, en_GB
Read the instructions prior to performing any task!

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  • Page 1 Operating and installation instructions REMKO ML series Wall mounted units in split design ML 265 DC, ML 355 DC, ML 525 DC, ML 685 DC 0245-2020-01 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 ML series Before commissioning........................42 Commissioning........................... 42 Troubleshooting, fault analysis and customer service..............44 10.1 Troubleshooting and customer service..................44 10.2 Indoor unit fault analysis......................46 10.3 Resistances of the temperature probes..................57 Care and maintenance........................60 Shutdown............................. 62 Exploded view and spare parts lists....................

  • 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 ML 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 ML 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 ML 265 DC ML 355 DC ML 525 DC ML 685 DC Inverter wall-mounted room air conditioner combination for Operating mode cooling and heating 2.6 (0.9-3.2) 3.5 (0.8-4.2) 5.3 (1.7-6.2) 7.2 (2.6-8.4) Nominal cooling output Energy efficiency ratio SEER Electrical rated power consumption, 0.75...
  • Page 10 REMKO ML series ML 265 DC ML 355 DC ML 525 DC ML 685 DC IT Data specific to indoor unit Application area (room volume), approx. Adjustment range, room temperature °C +17 to +30 Air flow volume per stage 259/429/521 294/478/539 420/505/750 640/830/1020...
  • Page 11 ML 265 DC ML 355 DC ML 525 DC ML 685 DC Data specific to outdoor unit V/Ph/H Power supply 230/1~/50 °C +5 to +30 Operating range, cooling Operating range, heating °C +5 to +50 Air flow rate, max. 2000 2000 2100 2700...

  • Page 12: Unit Dimensions

    REMKO ML series 2.2 Unit dimensions Outdoor units Fig. 1: Outdoor unit ML 265 DC-685 DC AT dimensions Measurements (mm) ML 265 DC-355 DC AT ML 525 DC AT ML 685 DC AT Indoor units Fig. 2: Indoor unit dimensions ML 265 DC-685 DC IT(All measurements in mm)

  • Page 13: Design And Function

    Design and function 3.1 Unit description The ML series room air conditioners have a REMKO ML...AT outdoor unit as well as an ML...IT indoor unit. In cooling mode, the outdoor unit serves to output the heat extracted by the indoor unit from the room being cooled.

  • Page 14: Operation

    REMKO ML 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 15: 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 16 REMKO ML series "TIMER ON" key Indicators on the LCD Press this key to activate the unit start delay time. Each press of this key increases the delay time by 30 minutes. When the set time on the display exceeds 10.0, each press of the button increases the set time by 60 minutes.
  • Page 17 "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 18 REMKO ML series "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 19 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 20 REMKO ML 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 21 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 22: Installation Instructions For Qualified Personnel

    REMKO ML series Installation Instructions for qualified personnel 5.1 Important notes prior to instal- 5.2 Wall openings lation A wall opening of at least 70mm diameter and 10mm incline from the inside to the outside Transport the unit in its original packaging as must be created.

  • Page 23: Selection Of Installation Location

    5.4 Selection of installation Wind location If the unit is being installed in windy areas, ensure that the warm outlet air is discharged in the pre- Indoor unit vailing wind direction. If this is not the possible, it The indoor unit is designed for horizontal wall may be necessary to install a windbreak (to be pro- installation above doors.

  • Page 24: Minimum Clearances

    REMKO ML series Fig. 23: Installation inside buildings K: Cold fresh air / W: Warm air 3: Air shaft 1: Outdoor unit / 2: Additional fan 5.5 Minimum clearances Observe the minimum clearances to allow access for maintenance and repair work and facilitate optimum air distribution.

  • Page 25: Wall Bracket

    5.6 Wall bracket Fig. 25: Wall bracket for indoor units ML 265 DC-685 DC IT (rear view) Measurements (mm) ML 265 DC IT ML 355 DC IT ML 525 DC IT ML 685 DC IT 53.5...

  • Page 26: Connection Variants For The Indoor Unit

    REMKO ML series 5.7 Connection variants for the indoor unit The following connection variants can be used for the refrigerant, condensate and control lines. Fig. 26: Connection variant (view from the rear) A: Infeed of the refrigerant piping at the wall, left...

  • Page 27: Oil Return Measures

    Installation 5.9 Oil return measures If the outdoor unit is installed at a higher level than 6.1 Installation of the indoor unit the indoor unit, suitable oil return measures must be taken. Usually, an oil pump bend is installed for every 7 metres of height difference.

  • Page 28: Connecting The Refrigerant Piping

    REMKO ML series 6.2 Connecting the refrigerant The following instructions describe the installation of the cooling cycle and the assembly of the indoor piping unit and the outdoor unit. The refrigerant piping is connected (responsibility The required pipe diameters are given in the of the customer) on the back side of the units.
  • Page 29 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 electrical lines and refrigerant piping! The con- nections of the individual circuits must not be mixed up.

  • Page 30: Additional Notes On Connecting The Refrigerant Piping

    REMKO ML series 6.4 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 31: Adding Refrigerant

    6.5 Adding refrigerant 6.6 Condensate drainage connec- tion and safe drainage The units contain a basic quantity of refrigerant. In addition, an additional amount of refrigerant must be added for refrigerant piping lengths exceeding 5 metres per circuit. Refer to the following chart: Up to and From 5 m to incl.
  • Page 32 (view from front). Remove the stopper from the corresponding con- nection. 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. Condensate drainage connection...

  • Page 33: Electrical Wiring

    Electrical wiring 7.1 General Information Make the connection as follows: Open the air inlet grill. A protected power supply cable is to be connected to the outdoor unit and a five-core control line to Remove the covers on the right-hand side the indoor unit respectively.

  • Page 34: Connecting The Outdoor Unit

    REMKO ML series 7.3 Connecting the outdoor unit 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 a cable-section according to the rele- vant specifications.
  • Page 35 Connection of optional condensate pump KP 6/KP 8 W 1(L) 2(N) W 1(L) 2(N) L N PE Fig. 40: Electrical wiring diagram Outdoor unit Condensate pump supply Indoor unit Condensate pump fault contact KP6/KP8 condensate pump BK: black Power supply cable WH: white...

  • Page 36: Electrical Drawings

    REMKO ML series 7.5 Electrical drawings Indoor units ML 265 DC-685 DC IT Weiß/ White Rot/ Blau/ Yellow/ Blue Gelb W 1(L) 2(N) S N-IN Cn31 Fig. 41: Electrical drawings A: Control board 3: Fin motor, vertical B: Display circuit board...
  • Page 37 Outdoor units ML 265 DC-355 DC AT CN 17 CN 15 CN 60 Fig. 42: Electrical drawings A: Control board 4: Condenser/DC fan B: Power supply cable 5: Temperature probe for condenser air inlet T4 C: Lines to indoor unit 6: Temperature probe for heat gas line 1: Reversing valve compressor T5...
  • Page 38 REMKO ML series Outdoor unit ML 525 DC AT Yellow/ Gelb Schwarz/ Black Blau/ Rot/ Blue Rot/ W 1(L) 2(N) S CN 5 CN 16 CN 60 CN 8 CN 7 CN 2 Yellow and Green/ Gelb und Grün L-OUT RY 1 Fig.
  • Page 39 Outdoor unit ML 685 DC AT CN414 L-OUT Blau CN13 CN12 Blau Schwarz (Blau) Gelb CN6-1 CN10 1(L) 2(N) S L Fig. 44: Electrical drawings A: Control board Fan motor (optional) Supply line to the indoor unit Transformer Power supply cable Compressor 4-way valve (optional) Heat gas probe...

  • Page 40: Connection Of A Superordinate Controller Provided By The Customer

    REMKO ML series 7.6 Connection of a superordinate The multifunction board is equipped with a total of 5 terminals (see Fig. 48), with which the following controller provided functions can be realised: by the customer Units of type ML can be switched on and off by a superordinate controller.
  • Page 41 Connection of a cable remote control with week program (MCC-1 controller): Optionally, the multifunction controller with week program MCC-1 can be connected to the indoor unit. The connection also takes place via the supplied multifunction board to the terminals X, Y and E (see Fig.

  • Page 42: Before Commissioning

    REMKO ML series 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 43 Function test of the cooling and heating modes Remove the protective caps from the valves. Start the commissioning procedure by briefly opening the shut-off valves on the outdoor unit until the pressure gauge indicates a pressure of approx. 2 bar. Check all connections for leaks with leak detection spray and suitable leak detectors.

  • Page 44: Troubleshooting, Fault Analysis And Customer Service

    REMKO ML series Troubleshooting, fault analysis 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 45 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 46: Indoor Unit Fault Analysis

    REMKO ML 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 47 Error code: Reason: The indoor unit does not receive a signal from the outdoor unit within 110 seconds. The check is performed 4 times in a row, then error E1 is displayed. Cause: Electrical connection not configured correctly Control boards outdoor unit or indoor unit defective Switch off voltage, switch on again 2 minutes later.
  • Page 48 REMKO ML 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 F5 Cause: Electrical connection faulty Evaporator fan wheel defective...
  • Page 49 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 50 REMKO ML 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 51 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 52 REMKO ML 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 53 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 54 REMKO ML 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 55 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 56 REMKO ML 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 57: 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 58 REMKO ML 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 59 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 60: Care And Maintenance

    REMKO ML 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 61 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 62: Shutdown

    Ensure that units and components are disposed of in accordance with local regulations, e.g. through authorised disposal and recycling specialists or at collection points. REMKO GmbH & Co. KG or your contractual partner will be pleased to provide a list of certified firms in your area.

  • Page 63: Exploded View And Spare Parts Lists

    Exploded view and spare parts lists 13.1 Exploded view - Indoor unit Fig. 59: Exploded view of the unit ML 265 DC-685 DC IT We reserve the right to modify the dimensions and design as part of the ongoing technical development process.

  • Page 64: Spare Parts List - Indoor Unit

    REMKO ML series 13.2 Spare parts list - Indoor unit 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 65: Exploded View Of The Outdoor Unit

    13.3 Exploded view of the outdoor unit Fig. 60: Exploded view of the outdoor units ML 265 DC-685 DC AT We reserve the right to modify the dimensions and design as part of the ongoing technical development process.

  • Page 66: Spare Parts List - Outdoor Unit

    REMKO ML series 13.4 Spare parts list - Outdoor unit IMPORTANT! To ensure the correct delivery of spare parts, please always the device type with the corresponding serial number (see type plate) No. Designation Front panel, left Protection grid, front plate...

  • Page 67: Index

    Index Multifunction board, connection ... . . 40 Alarms Checks ......44 Oil return measures .
  • Page 68 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:

Ml 265 dcMl 355 dcMl 525 dcMl 685 dc

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