Table of Contents
Related Manuals for REMKO SKT 521
Summary of Contents for REMKO SKT 521
- Page 1 Operating and installation instructions REMKO SKT series Multisplit air-conditioning systems for cooling and heating Outdoor units SKT 521, SKT 791, SKT 1061 0243-2019-12 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...
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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 Care and maintenance........................54 Shutdown............................. 55 Exploded view and spare parts lists....................56 14.1 Exploded view of the unit SKT 521 AT..................56 14.2 Spare parts list for SKT 521 AT....................57 14.3 Exploded view of the unit SKT 791 AT..................58 14.4 Spare parts list for SKT 791 AT....................
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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 521 AT SKT 791 AT SKT 1061 AT Inverter multisplit outdoor units for cooling and Operating mode heating 10,5 Nominal cooling output (2,1-6,9) (2,9-8,5) (2,1-10,6) Energy efficiency ratio SEER Power consumption, annual, Q... - Page 10 REMKO SKT series Series SKT 521 AT SKT 791 AT SKT 1061 AT Refrigerant, basic quantity 1,25 1,72 2,10 equivalent 0,84 1,16 1,42 Refrigerant, additional quantity >5 m Max. number of indoor units Refrigerant piping, max. length per IU Refrigerant piping, max. total length Refrigerant piping, max.
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Page 11: Unit Dimensions
2.2 Unit dimensions Fig. 1: Dimensions We reserve the right to modify the dimensions and design as part of the ongoing technical development process. SKT 521 SKT 791 SKT 1061 (All measurements in mm) -
Page 12: Performance Curves For Heating And Cooling
2,00 1,50 1,00 0,50 0,00 [°C] Fig. 3: Performance curves, cooling SKT 521 (data for room temperature FK 27°C/TK 19 °C) A: Outside temperature 2: Cooling capacity in kW 1: EER 3: Power consumption in kW Outside temperature in °C Cooling capacity in kW 5.10... - Page 13 Heating capacity SKT 791 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. 4: Performance curves, heating SKT 791 (data for room temperature 20 °C) A: Outside temperature 2: Heating capacity in kW 1: COP 3: Power consumption in kW...
- Page 14 REMKO SKT series Heating capacity SKT 1061 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 0,00 [°C] Fig. 6: Performance curves, heating SKT 1061 (data for room temperature 20 °C)
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Page 15: Design And Function
Condenser fan electronic expansion valves and a condenser fan. Reversing valve The outdoor unit can be combined with REMKO Compressor indoor units from the series SKT 261 IT that pro- Capillary tube throttle element vide sufficient cooling capacity. - Page 16 REMKO SKT series Fig. 9: System layout SKT 1061 AT Outdoor area Power supply Ba-d: Indoor area Shut-off valves 1a-d: Indoor units Suction pipes Outdoor unit Injection pipes Condensate drainage line Control lines Condenser fan The connection between the indoor unit (indoor areas Ba, Bb, Bc, Bd, Be) and the outdoor unit (connection circuits A, B, C, D, E) of the outdoor unit is established using refrigerant piping and a control line.
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Page 17: Combinations
Components with a safety function is excluded from our recommendation! Fig. 10: Indoor unit The following combinations of outdoor units can be selected: SKT 521 - Combination with 2 indoor units Indoor units Combination 2.6 kW For more, see the next page. -
Page 18: Installation Instructions For Qualified Personnel
REMKO SKT series Installation instructions Only use the union nuts supplied with the refrigerant piping. These should only be for qualified personnel removed shortly before connecting the refrig- erant piping. 5.1 Important notes prior Carry out all electrical wiring in accordance to installation with applicable DIN and VDE standards. -
Page 19: Wall Openings
5.2 Wall openings 5.4 Selection of installation location A wall opening of at least 70mm diameter and 10mm incline from the inside to the outside Indoor unit must be created. The indoor unit is designed for horizontal wall To prevent damage to the lines, the interior of installation above doors. - Page 20 REMKO SKT series 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).
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Page 21: Minimum Clearances
7 metres of height difference. Fig. 15: Minimum clearances for outdoor unit 1: Air inlet 2: Air outlet Fig. 16: Oil return measures SKT 521-1061 A: Outdoor unit B: Indoor unit 1: One oil pump bend in suction pipe to outdoor 1200... -
Page 22: Installation
REMKO SKT series Installation The following instructions describe the installation of the cooling cycle and the assembly of the indoor 6.1 Connection of unit and the outdoor unit. refrigerant piping The required pipe diameters are given in the table "Technical data". - Page 23 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.
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Page 24: Leak Testing
REMKO SKT series NOTICE! A vacuum of at least 20 mbar must be pro- duced! The time required to generate the vacuum is dependent on the final pressure pipe volume of the indoor units and the length of the refrigerant piping. -
Page 25: Adding Refrigerant
From 5 m incl. 5 m heating mode. A condensate tray should be installed on the underside of the unit to drain any SKT 521-1061 AT 0 g/m 30 g/m condensate. The condensate drainage line should have an incline of min. -
Page 26: Electrical Wiring
REMKO SKT series Electrical wiring 8.1 General connection and safety Proceed as follows to connect the line: instructions Remove the side panel at the connection. For the MVT devices, an electrical supply must be Choose the cable cross-section in accord- laid as a mains supply to the outdoor unit as well ance with the relevant specifications. - Page 27 Fig. 22: Electrical wiring of the cable shown on the SKT 791 AT as an example 1: Power supply 2: Strain relief 3: Control line for indoor unit A 4: Control line for indoor unit C 5: Control line for indoor unit B...
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Page 28: Electrical Wiring Diagram
REMKO SKT series 8.3 Electrical wiring diagram SKT AT in combination with the IT SKT 261 indoor units SKT 520 AT SKT 790 AT SKT 1060 AT L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) 2 (N) -
Page 29: Electrical Drawings
8.4 Electrical drawings Overview diagram of SKT 521 AT L(B) N(B) S(B) Fig. 24: Overview diagram of SKT 521 AT A: Control board Crankcase heating B: Inverter board Condensate tray heating AT: Mains cable for outdoor unit 230 V / 1~ / 50 Hz... - Page 30 REMKO SKT series Overview diagram of SKT 791 ATR Fig. 25: Overview diagram of SKT 791 AT A: Control board Condensate tray heating B: Inverter board Temperature probe for condenser outlet T3 AT: Mains cable for outdoor unit 230 V / 1~ / 50 Hz...
- Page 31 Overview diagram of SKT 1061 AT Fig. 26: Overview diagram of SKT 1061 AT A: Control board Crankcase heating B: Inverter board Condensate tray heating C: Com circuit board Temperature probe for condenser outlet T3 AT: Mains cable for outdoor unit 230 V / 1~ / 50 Hz Temperature probe for condenser inlet T4 IT: Connection for indoor units 1-4 High-pressure probe...
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Page 32: Before Commissioning
REMKO SKT 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 33 Function test of cooling operating mode NOTICE! Remove the protective caps from the valves. Start the commissioning procedure by briefly Check that the shut-off valves and valve caps opening the shut-off valves on the outdoor are tight after carrying out any work on the unit until the pressure gauge indicates a cooling cycle.
- Page 34 REMKO SKT series If the compressor moves to an incorrect fre- quency range within 15 minutes, a safety shut- down occurs and the unit shows "E6" If there is a malfunction, the malfunction is dis- played coded. See the "Outdoor unit malfunc- tion display"...
- Page 35 Continued Item Display Description Temp. of suction pipe for indoor unit A (T Current value. If the temperature is lower than Temp. of suction pipe for indoor unit B (T -9°C, the display shows "-9". If the temperature Temp. of suction pipe for indoor unit C (T is higher than 70°C, the display shows "70".
- Page 36 REMKO SKT series (3) Cooling capacity - Heating capacity OU / IU Display Temperature (°C) Cooling Heating 22.5 Display capacity capacity 25.0 (kW) (kW) 27.5 2.0-2.5 2.0-2.5 30.0 2.0-2.5 2.0-2.5 32.5 3.0-3.8 3.0-3.8 34.5 4.5-5.0 4.5-5.0 5.5-6.1 (7) Outdoor unit current consumption 5.5-6.1...
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Page 37: Troubleshooting, Fault Analysis And Customer Service
Troubleshooting, fault analysis and customer service 11.1 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 38 REMKO SKT series Operational malfunctions (continued) Malfunction Possible causes Checks Remedial measures Thermal load has Is the outdoor unit in per- Reduce the thermal load. The compressor's increased manent operating mode? If necessary, install an suction pipe and / or...
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Page 39: Outdoor Unit Error Analysis
11.2 Outdoor unit error analysis Error E0: EEPROM error on outdoor unit Switch off, wait 2 minutes and then switch on again. Is the error still present? Replace the control board. Error E3: Communication error between inverter board and control board The board shows E3 The control board cannot communicate with the... - Page 40 220 and 240 Is voltage present between terminals P and N on the inverter board? Is the measured value between 277-356 VDC (SKT 521) or 277-410 VDC (larger ver- sions) Replace the rectifier. Is the error rectified? Replace the inverter board.
- Page 41 Error E8: Condenser fan speed control not working Switch off, wait 2 minutes and then switch on again. Is The unit operates normally. the error still present? Switch off; rotate the con- Determine the cause and denser fan manually. Does rectify the error.
- Page 42 REMKO SKT series Error P1: High pressure fault (for larger versions) High pressure fault P1 is present. Is the electrical connection between the high pressure probe and the control board established correctly? Check whether the high pressure probe is faulty.
- Page 43 Error P2: Low pressure alarm Low pressure probe has tripped. Error P2 is present. Is the electrical connection between the low pressure Correct the connection. probe and the control board established correctly? Check whether the low pressure probe is faulty. Remove the low pressure probe's plug and measure Replace the low pressure...
- Page 44 REMKO SKT series Error P3: Compressor current consumption too high Safety shut-down due to increased current consump- tion on the compressor. Switch the unit off, switch it back on and measure the total current consumption. Is this within the specified range? Check the cooling cycle.
- Page 45 Error P4: Temperature probe for heat gas line faulty Heat gas temperature on the compressor too high Is the heat gas temperature higher than 115°C? Check the cooling cycle for leaks. Did you find a leak? Check the electrical con- nection between the heat Establish the electrical con- gas line temperature probe...
- Page 46 REMKO SKT series Error P5: Excessive temperature on condenser The unit stops if the refrigerant temperature on the condenser outlet exceeds 65 °C. It re-starts once the temperature is 52 °C. Excessive tempera- Check the electrical ture safety shut- connection between Establish the connection correctly.
- Page 47 Check the voltage between the inverter board's P and N See the second part of terminals. Is this between this table on the next 277-366 VDC (SKT 521) or page! 277-410 VDC (larger ver- sions)? Check the electrical con- nection between the control board and the inverter Correct the connection.
- Page 48 P and N termi- See the first part of this table on nals. Is this between the previous page! 277-366 VDC (SKT 521) or 277-410 VDC (larger versions)? Check the power supply to the mains cable. Is Correct the mains cable.
- Page 49 Check the individual components Check the temperature probes Disconnect the temperature probe from the control board and measure the resistance on the plug's contacts. Ä Chapter 11.3 ‘Resistances of the temperature probes’ on page 51) (See tables and Fig. 28: Check temperature probes 1: Multimeter Check compressor motor resistance values Use a multimeter to check the resistance values.
- Page 50 REMKO SKT series Check the IPM board Switch the unit off and wait until the condensers are completely discharged. Disconnect the cables from the IPM board and measure the resistances between P and UVWN, UVW and N. Voltmeter Normal resistance...
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Page 51: Resistances Of The Temperature Probes
11.3 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 52 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 53 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...
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Page 54: 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 55: 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 56: Exploded View And Spare Parts Lists
Exploded view and spare parts lists 14.1 Exploded view of the unit SKT 521 AT Fig. 32: Exploded view of the unit SKT 521 AT We reserve the right to modify the dimensions and design as part of the ongoing technical development process. -
Page 57: Spare Parts List For Skt 521 At
14.2 Spare parts list for SKT 521 AT IMPORTANT! To ensure the correct delivery of spare parts, please always the device type with the corresponding serial number (see type plate) No. Designation Condenser protection grille Condenser front panel Fan blade... -
Page 58: Exploded View Of The Unit Skt 791 At
REMKO SKT series 14.3 Exploded view of the unit SKT 791 AT Fig. 33: Exploded view of the unit SKT 791 AT We reserve the right to modify the dimensions and design as part of the ongoing technical development process. -
Page 59: Spare Parts List For Skt 791 At
14.4 Spare parts list for SKT 791 AT IMPORTANT! To ensure the correct delivery of spare parts, please always the device type with the corresponding serial number (see type plate) No. Designation Condenser protection grille Condenser front panel Fan blade Fan motor 4-way valve Electronic injection valve... -
Page 60: Exploded View Of The Unit Skt 1061 At
REMKO SKT series 14.5 Exploded view of the unit SKT 1061 AT Fig. 34: Exploded view of the unit SKT 1061 AT We reserve the right to modify the dimensions and design as part of the ongoing technical development process. -
Page 61: Spare Parts List For Skt 1061 At
14.6 Spare parts list for SKT 1061 AT IMPORTANT! To ensure the correct delivery of spare parts, please always the device type with the corresponding serial number (see type plate) No. Designation Condenser protection grille Condenser front panel Fan blade Fan motor 4-way valve Low-pressure probe... -
Page 62: Index
REMKO SKT series Index Ordering spare parts ....57, 59, 61 Outdoor unit board malfunction display ..38 Alarms Checks ......37 Possible causes . - Page 64 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...