Midea RSJ-120/ZN1-540V1 Technical Manual
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Midea RSJ-120/ZN1-540V1 Technical Manual

R410a direct heating commercial heat pump 50hz
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Midea R410A Direct Heating Type HPWH 50Hz Technical Manual
Direct Heating Commercial Heat Pump
Applicable Model:
RSJ-120/ZN1-540V1
RSJ-200/SZN1-540V1
RSJ-420/SZN1-H
RSJ-800/SZN1-H
Midea reserves the right to discontinue, or change specification or designs at any time without notices and
without incurring obligations.
Midea R410A
50Hz
Technical Manual
Midea CAC Confidential
MCAC-HTSM-201906
1

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Summary of Contents for Midea RSJ-120/ZN1-540V1

  • Page 1 MCAC-HTSM-201906 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual Applicable Model: RSJ-120/ZN1-540V1 RSJ-200/SZN1-540V1 RSJ-420/SZN1-H RSJ-800/SZN1-H Midea reserves the right to discontinue, or change specification or designs at any time without notices and without incurring obligations. Midea CAC Confidential...
  • Page 2 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Content Part 1 General Information ..............3 Part 2 Performance ................. 6 Part 3 Installation .................. 43 Part 4 Wired Controller ................. 77 Midea CAC Confidential...

  • Page 3: Part 1 General Information

    Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Part 1 General Information 1 Product lineup ................4 2 External appearance ..............4 3 Nomenclature ................5 Midea CAC Confidential...
  • Page 4 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual 1 Product lineup Table 1-1.1: Product lineup Model Power supply RSJ-120/ZN1-540V1 220-240V~, 1Ph, 50Hz RSJ-200/SZN1-540V1 380-415V~, 3Ph, 50Hz RSJ-420/SZN1-H 380-415V~, 3Ph, 50Hz RSJ-800/SZN1-H 380-415V~, 3Ph, 50Hz 2 External appearance Figure 1-2.1: External appearance...
  • Page 5 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 3 Nomenclature 540V1 Design code Refrigerant Type N1:R410A Heating Type Z: Direct heating Power Supply S: 380~415V, 50Hz, 3Ph Omit for 220~240V, 50Hz, 1Ph Rated heating capacity of heat pump (*100W)

  • Page 6: Table Of Contents

    MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Part 2 Performance 1 Features ..................7 2 Specifications ................8 3 Dimensions ................. 12 4 Service space ................15 5 Refrigerant circuit ............... 18 6 Wiring diagrams ................. 21 7 Main PCB descriptions ..............

  • Page 7: Features

    Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 1 Features  High efficient, COP is up to 4.04 (20kW, 39kW) and 4.00 (12kW, 80kW).  Unit applies refrigerant heating technology to increase the total energy absorb.  Refrigerant E-heater design can ensure that hot water can be produced stably during defrosting period.

  • Page 8: Specifications

    MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual 2 Specifications Table 2-1.1: RSJ-120/ZN1-540V1 specifications Model name RSJ-120/ZN1-540V1 Power supply V/Ph/Hz 220-240/1/50 Capacity 11.8 Water heating Rated power input 2.95 4.00 Max. power input Max. input current 18.0 Type...
  • Page 9 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Table 2-1.2: RSJ-200/SZN1-540V1 specifications Model name RSJ-200/SZN1-540V1 Power supply V/Ph/Hz 380-415/3/50 Capacity 20.4 Water heating Rated power input 5.05 4.04 Max. power input 7.80 Max. input current 13.3 Type Scroll...
  • Page 10 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Table 2-1.3: RSJ-420/SZN1-H specifications Model name RSJ-420/SZN1-H Power supply V/Ph/Hz 380-415/3/50 Capacity 39.0 Water heating Rated power input 9.65 4.04 Max. power input 14.5 Max. input current 24.0 Type Scroll...
  • Page 11 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Table 2-1.4: RSJ-800/SZN1-H specifications Model name RSJ-800/SZN1-H Power supply V/Ph/Hz 380-415/3/50 Capacity 80.0 Water heating Rated power input 20.0 Max. power input 26.0 Max. input current 45.0 Type Scroll Quantity Capacity 29.95...

  • Page 12: Dimensions

    MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual 3 Dimensions Figure 2-3.1: Dimensions of RSJ-120/ZN1-540V1, RSJ-200/SZN1-540V1 (Unit: mm) Midea CAC Confidential...
  • Page 13 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Figure 2-3.2: Dimensions of RSJ-420/SZN1-H (Unit: mm) Midea CAC Confidential...
  • Page 14 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Figure 2-3.3: Dimensions of RSJ-800/SZN1-H (Unit: mm) Midea CAC Confidential...

  • Page 15: Service Space

    Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 4 Service space Figure 2-4.1: Service space of RSJ-120/ZN1-540V1, RSJ-200/SZN1-540V1 (Unit: mm) Midea CAC Confidential...
  • Page 16 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Figure 2-4.2: Service space of RSJ-420/SZN1-H (Unit: mm) Midea CAC Confidential...
  • Page 17 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Figure 2-4.3: Service space of RSJ-800/SZN1-H (Unit: mm) Midea CAC Confidential...

  • Page 18: Refrigerant Circuit

    MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual 5 Refrigerant circuit Figure 2-5.1: Refrigerant circuit of RSJ-120/ZN1-540V1, RSJ-200/SZN1-540V1 Midea CAC Confidential...
  • Page 19 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Figure 2-5.2: Refrigerant circuit of RSJ-420/SZN1-H Midea CAC Confidential...
  • Page 20 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Figure 2-5.3: Refrigerant circuit of RSJ-800/SZN1-H Midea CAC Confidential...

  • Page 21: Wiring Diagrams

    Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 6 Wiring diagrams Figure 2-6.1:Wiring diagram of RSJ-120/ZN1-540V1 Midea CAC Confidential...
  • Page 22 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual   Figure 2-6.2:Wiring diagram of RSJ-200/SZN1-540V1   Midea CAC Confidential...
  • Page 23 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Figure 2-6.3: Wiring diagram of RSJ-420/SZN1-H Midea CAC Confidential...
  • Page 24 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Figure 2-6.4: Wiring diagram of RSJ-800/SZN1-H Midea CAC Confidential...

  • Page 25: Main Pcb Descriptions

    Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 7 Main PCB descriptions Figure 2‐7.1: Main PCB description of RSJ-120/ZN1-540V1 14 15 16   Midea CAC Confidential...
  • Page 26 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Table 2-7.1: Main PCB descriptions Label in Code Content Figure 2-7.1 CN31 AC Power input CN32 Transformer input CN13 Compressor contactor control port connection Fan motor connection and refrigerant pipe E-heating connection...
  • Page 27 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Figure 2-7.2: Main PCB description of RSJ-200/SZN1-540V1 Midea CAC Confidential...
  • Page 28 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Table 2-7.2: Main PCB descriptions Label in Code Content Figure 2-7.1 Current detection Black: Air side heat exchanger temperature sensor connection; CN37 White: Ambient temperature sensor connection; Electronic lock CN26...
  • Page 29 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Figure 2‐7.3: Main PCB description of RSJ‐420/SZN1‐H Midea CAC Confidential...
  • Page 30 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Table 2-7.3: Main PCB descriptions of RSJ-420/SZN1-H Label in Code Content Figure 2-7.3 Communication port for other unit CN39 Communication port for wired controller CN40 CN15 High pressure switch connection...
  • Page 31 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Figure 2‐7.4: Main PCB description of RSJ‐800/SZN1‐H Midea CAC Confidential...
  • Page 32 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Table 2-7.4: Main PCB descriptions of RSJ-800/SZN1-H Label in Code Content Figure 2-7.4 Communication port for other unit CN39 Communication port for wired controller CN40 CN15 High pressure switch connection...

  • Page 33: Electrical Characteristics

    Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 8 Electrical characteristics Table 2-8.1: Electrical Characteristics Model RSJ-120/ZN1-540V1 RSJ-200/SZN1-540V1 RSJ-420/SZN1-H RSJ-800/SZN1-H Outdoor Voltage 220~240V, 1Ph 380~415V, 3Ph 380~415V, 3Ph 380~415V, 3Ph unit Min. 198V 342V 342V 342V Max. 264V...

  • Page 34: Capacity Table

    MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual 9 Capacity table Table 2-9.1: RSJ-120/ZN1-540V1 capacity table Inlet water Temp. Capacity Mode Outdoor temperature (°C DB) Outlet water Temp. (°C) (°C) (kW) 15.05 5.53 15.19 5.35 15.18 5.15 15.10 4.81...
  • Page 35 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Table 2-9.1: RSJ-120/ZN1-540V1 capacity table (continued) Inlet water Temp. Capacity Mode Outdoor temperature (°C DB) Outlet water Temp. (°C) (°C) (kW) 10.13 10.08 3.48 10.52 3.65 10.43 9.66 3.08 9.04 3.54...
  • Page 36 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Table 2-9.2: RSJ-200/SZN1-540V1 capacity table Inlet water Temp. Capacity Mode Outdoor temperature (°C DB) Outlet water Temp. (°C) (°C) (kW) 29.90 6.08 30.37 5.71 30.56 5.51 30.45 5.19 30.15 4.86 28.83...
  • Page 37 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Table 2-9.2: RSJ-200/SZN1-540V1 capacity table (continued) Inlet water Temp. Capacity Mode Outdoor temperature (°C DB) Outlet water Temp. (°C) (°C) (kW) 16.50 3.05 12.20 3.11 11.90 2.85 11.76 2.66 11.82 2.45...
  • Page 38 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Table 2-8.3: RSJ-420/SZN1-H capacity table Inlet water Temp. Capacity Mode Outdoor temperature (°C DB) Outlet water Temp. (°C) (°C) (kW) 55.72 6.36 55.40 6.00 54.75 5.64 54.58 5.28 52.46 5.03 56.99...
  • Page 39 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Table 2-8.3: RSJ-420/SZN1-H capacity table (continued) Inlet water Temp. Capacity Mode Outdoor temperature (°C DB) Outlet water Temp. (°C) (°C) (kW) 25.76 3.28 23.20 2.99 20.64 2.72 19.59 2.48 19.21 2.88...
  • Page 40 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Table 2-8.4: RSJ-800/SZN1-H capacity table Inlet water Temp. Capacity Mode Outdoor temperature (°C DB) Outlet water Temp. (°C) (°C) (kW) 102.34 5.74 102.02 5.42 101.36 5.09 100.39 4.76 99.08 4.44 102.27...
  • Page 41 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Table 2-8.4: RSJ-800/SZN1-H capacity table (continued) Inlet water Temp. Capacity Mode Outdoor temperature (°C DB) Outlet water Temp. (°C) (°C) (kW) 55.09 3.44 52.53 3.14 49.97 2.86 47.41 2.60 46.87 2.98...

  • Page 42: Accessories

    MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual 10 Accessories Table 2-10.1: Accessories Quantity Name Shape Outdoor unit installation and owner’s manual Y-shaped filter Wired controller Temperature sensor for domestic hot water tank Transit line for wired controller Notes: 1.

  • Page 43: Part 3 Installation

    Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Part 3 Installation 1. Safety information ................ 44 2. Unit installation ................45 3. Trial run ..................61 4. Fault analysis and solutions ............62 5. Maintenance ................75 Midea CAC Confidential...

  • Page 44: Safety Information

    MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual 1 Safety information To prevent injury to the user or other people and property damage, the following instructions must be followed. Incorrect operation due to ignoring of instructions may cause harm or damage.

  • Page 45: Unit Installation

    Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906  Do not operate the unit with a wet hand. An electric shock may be caused.  The installation height of power supply should be over 1.8m, if there is any water spattered, separate the power supply from water.
  • Page 46 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual 2.1 Unit outlook Figure 3-2.1: Unit outlook for RSJ-120/ZN1-540V1, Figure 3-2.2: Unit outlook for RSJ-420/SZN1-H RSJ-200/SZN1-540V1 Figure 3-2.3: Unit outlook for RSJ-800/SZN1-H Midea CAC Confidential...
  • Page 47  For RSJ-120/ZN1-540V1 and RSJ-200/SZN1-540V1, before Lifting, open the front and rear cover of the lower unit and reset it after installation. The lifting angle of the rope should larger than 60°.
  • Page 48 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Figure 3-2.6: Lifting of RSJ-800/SZN1-H 2.3 Unit installation caution  The unit can be installed on the ground or on the suitable roof, but enough ventilation volume should be ensured in both cases.
  • Page 49 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906  The unit can be installed on the ground or ont the suitable roof, but it should follows the relative standards or laws to all lightnin-proof measures for the whole water heating system.
  • Page 50 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual 2.5 Unit installation space Figure 3-2.8: Unit installation space (Unit: mm) RSJ-120/ZN1-540V1, RSJ-200/SZN1-540V1 RSJ-420/SZN1-H RSJ-800/SZN1-H Midea CAC Confidential...
  • Page 51 Use thermal insulation material to wrap the inlet water pipe, outlet water pipe and circulative water pipes.  The pipe diameter of main water pipes: Table 3-2.2: Water pipe joint specifications for multi units RSJ-120/ZN1-540V1 Amount of units connected in parallel Water inlet pipe joint Water outlet pipe joint...
  • Page 52 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual Table 3-2.3: Water pipe joint specifications for multi units RSJ-200/SZN1-540V1 Amount of units connected in parallel Water inlet pipe joint Water outlet pipe joint DN25 DN25 DN32 DN32 DN50 DN50...
  • Page 53 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Figure 3-2.10: Multi units connection Table 3-2.6: Icons explanation Stop valve Motor operated valve Flexible rubber joint (soft-connect) Water pump Water using end Water supply controller Solenoid valve Pressure reducing valve...
  • Page 54 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual 2.7 Water tank installation  The water tank temperature sensor (T5) can not be placed in the water or on the water pipe directly. The water tank must be set a temperature pipe where the temperature sensor (T5) is installed.
  • Page 55 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 RSJ-800/SZN1-H Circulative heating rated water flow 14 m Water resistance of circulative rated water flow 160 kPa The hot water circulative pump must use hot water pump; the temperature resistance of the circulative water pump cannot lower than 80°C.
  • Page 56 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual  The unit must be ground wiring reliably.  Set leakage protective devices according to the requirements of national technical standard about electric equipment.  Power supply wire and signal wire should be arranged properly without interruption to each other, do not contact with connecting pipes and valves as well.
  • Page 57 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 RSJ-420/SZN1-H Power supply 380-415V, 3Ph, 50Hz Wire size (˂30m) 10# (UL1015) Min. wire size (metal pipe & synthetic resin pipe wire) Ground wire 10# (UL1015) Manual switch 63 A Manual switch...
  • Page 58 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual  Specifications of controlling wire Item Size (UL1015) Remarks E-heater controlling wire 2-core Circulating water pump controlling wire 2-core Remote alarm control wire 2-core Communication cable (shield) 3-core Wired controller power supply wire...
  • Page 59 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906  Electric wiring figure  Electric control schematic diagram of the unit (Only for reference) When power supply wire of the wired controller is less than 20m, wiring can be applied as the location shown...
  • Page 60 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual as imaginary lines, when it it exeeds 20m, the power adapter is necessery. Pay attention to the power phase sequence, if wrong connection of the phase sequence, the compressor will not operate, and digital screen of the water heater electrical control board will display error code.

  • Page 61: Trial Run

    Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 3 Trial run 3.1 Check list Please check the items before operation in the table 3-3.1. Table 3-3.1: Checking list before operation Item Whether the unit is installed firmly. Whether the air inlet and outlet of the unit has obstacle.

  • Page 62: Fault Analysis And Solutions

    MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual 4 Fault analysis and solutions 4.1 Abnormal phenomena Table 3-4.1: No distribution to malfunctions Phenomena Cause When the unit is defrosting, the sound of the 4-way valve being shifted. Air supply motor stop automatically to defrost.
  • Page 63 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Table 3-4.3: Phenomena need to contact Midea service agency Phenomena Possible reason Detect and settle measure 1. Power errors. Connected with wrong phase sequence. 2. Wire connection is loosening. Check and fasten again.
  • Page 64 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual 4.2 Error code list Normal display contents: 1. Under standby and no error and protection situation, the main unit will display the detected water tank sensor temperature (T5), the slave unit will display the address of this unit.
  • Page 65 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906  When the unit satisfies the unit stopping conditions, the counting of stop frequency will be cleaned. By the way, also it will be cleaned when the unit has not any protection in 10 hours. Otherwise, if switch off the unit by wired controller, the counting of stop frequency will not be cleaned.
  • Page 66 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual 4.3 Spot check Table 3-4.5: Spot check list Display Specification Water outlet temperature T1 temperature value Coil temperature T3 temperature value Ambient temperature T4 temperature value Water tank temperature T5 temperature value...
  • Page 67 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 4.4 Troubleshooting E1: Power phase sequence error E2: Communication error of host unit and wired controller, main unit and slave unit. E8: Error of circulating water flow detector (only host unit displays). The water flow switch is detected once then circulate pump is on;...
  • Page 68 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual E3: Error of water outlet temperature sensor (T1). E4: Error of water temperature sensor in the water tank (only host unit displays) (T5). E5: Error of air heat-exchanger temperature sensor (T3).
  • Page 69 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 P0: System low pressure protection. P0 appearances when suction pressure ≤ 0.05MPa. Midea CAC Confidential...
  • Page 70 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual P1: System high pressure protection. P1 appearances when discharge pressure ≥ 4.4MPa. Midea CAC Confidential...
  • Page 71 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 P2: Compressor current of system is overload. P2 appearances when compressor current ≥lo* Notes: 1. For RSJ-120/ZN1-540V1 the value of Io is 20A; For RSJ-200/SZN1-540V1 the value of Io is 18A. For RSJ-420/SZN1-H and RSJ-800/SZN1-H the value of Io is 30A.
  • Page 72 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual P4: Protection for discharge high temperature. P4 appearances when compressor discharges temperature ≥ 115°C. Midea CAC Confidential...
  • Page 73 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 P7: Host unit is not matched with wired controller, host unit will display P7, and wired controller will display E2. (Power supply of wired controller is 10VAC, if the power supply is not stable, the code of protection or error will also be displayed.)
  • Page 74 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual P8: Water outlet high temperature protection. P8 appearances when water outlet temperature ≥ 68°C for more than 2 minutes. C1: Compressor low current protection. C1 appears when compressor current is less than 2A during operation.

  • Page 75: Maintenance

    Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 5 Maintenance  All the safety protection devices in the unit will be set before leaving the factory, the user can not adjust or remove them, in case to damage the unit.
  • Page 76 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual  Under using the clean agents, it should accord to the dirt deposition to adjust the detergent concentration, cleaning time and temperature.  It needs to neutralize the waste liquid after cleaning; the waste liquid processing should contact the relative company.

  • Page 77: Part 4 Wired Controller

    Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Part 4 Wired Controller 1 Specifications ................78 2 Introduction of function buttons ..........78 3 Operation instruction ..............80 4 Installation ................. 86 Midea CAC Confidential...

  • Page 78: Specifications

    MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual 1 Specifications Model KJR-51/BMKE-A Input Voltage 10.0V Operating environment temperature -10º C~+43º C Operating RH RH 40%~RH 90% Performance Features  Touch key operation.  LCD displays operation parameters. ...
  • Page 79 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 ④ Timing ON/OFF indication ( ): Indicate the timing information. ⑤ Function icon:  : Display when water heater system connects to Modbus network;  : Displays when other heat source is provided to the system.

  • Page 80: Operation Instruction

    MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual step setting under timing setting status. Press these keys to turn over the unit parameter information under check status. OK key: Press this key to confirm settings. Press and hold this key for 3 seconds to unlock under locking status.
  • Page 81 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 following order each time the key is pressed. The setting options in the dotted line frame are not general setting. The wired controller automatically judges the needed setting according to the model of main unit.
  • Page 82 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual means the current setting is the minute of Timer 1 on, press the ▲ or ▼ to adjust, press key when finished, the LCD will display as the following:  At this time the hour of the clock will flash, which means the current setting is the hour of Timer 1 off, press the ▲...
  • Page 83 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 During any period of timing setting to press OK key, the timing periods which have been set will be effective (only if the on and off of one timing period have been set, the setting is effective).
  • Page 84 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual  Set clock Press the SET key 4 times to enter clock setting. The hour of the clock will flash, which means the current setting is the hour of the clock, press the ▲ or ▼ key to adjust, press key when finished, and then the minute of the clock will flash, it means the current setting is the minute of the clock, press the ▲...
  • Page 85 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Operation method: press AUXILIARY key twice to enter this function. The icon will flash, press OK key to confirm. The ’CYCLE’ icon will be on if the cycle heating running requirement is fulfilled and will be off if not fulfilled.

  • Page 86: Installation

    MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual  Press the ▲ or ▼ key to adjust the main unit serial number and check 16 unit’s status information from #0~#9. Press to adjust the check sequence number of one unit and check all the status information of this unit.
  • Page 87 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906  The wiring should adapt to the wired controller current. Otherwise, electric leakage or heating may occur and result in fire.  The specified cables shall be applied in the wiring. No external force may be applied to the terminal.
  • Page 88 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual 4.3 Dimensions 4.4 Wire connection There are two methods to connection between wired controller and main unit. Midea CAC Confidential...
  • Page 89 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 4.5 Back cover installation  Use straight head screwdriver to insert into the buckling position in the bottom of wired controller, and spin the screwdriver to take down the back cover. Pay attention to spinning direction, otherwise will damage the back cover.
  • Page 90 MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual  Use cross head screws to fix the wired controller bottom cover in the electric control box through the screw bar. Make sure the wired controller bottom cover is on the same level after installation, and then install the wired controller back to the bottom cover.
  • Page 91 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906 Method 3: 4.7 Front cover installation  After adjusting the front cover and then buckle the front cover. It should avoid to clamping the communication switching wire during installation. ...

This manual is also suitable for:

Rsj-200/szn1-540v1Rsj-420/szn1-hRsj-800/szn1-h

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