Midea RSJ-420/PZN1-H Technical Manual
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Midea RSJ-420/PZN1-H Technical Manual

R410a direct heating commercial heat pump 50hz
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Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual
Direct Heating Commercial Heat Pump
Applicable Model:
Midea reserves the right to discontinue, or change specification or designs at any time without notices and
without incurring obligations.
Midea R410A
Technical Manual
RSJ-420/SZN1-H
RSJ-800/SZN1-H
50Hz
MCAC-HTSM-201506
1

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Summary of Contents for Midea RSJ-420/PZN1-H

  • Page 1 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual Applicable Model: 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.
  • Page 2 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual Content Part. 1 General information ......3 Part. 2 Performance ........5 Part. 3 Installation ......... 26 Part. 4 Controller ........... 62...

  • Page 3: Part. 1 General Information

    Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 Part. 1 General information 1. Model Names of Units ............4 2. External Appearance ............. 4 3. Nomenclature ............... 4...

  • Page 4: Model Names Of Units

    MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual 1. Model Names of Units Model Power supply RSJ-420/SZN1-H 380-415V~, 3Ph, 50Hz Direct-heating Type RSJ-800/SZN1-H 380-415V~, 3Ph, 50Hz 2. External Appearance RSJ-420/PZN1-H RSJ-800/PZN1-H 3. Nomenclature RSJ - 420 / S Z N1 - H...

  • Page 5: Table Of Contents

    Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 Part. 2 Performance 1. Features ................6 2. Specifications ..............7 3. Dimensions (Unit: mm) ............9 4. Service Space (Unit: mm) ..........11 5. Refrigerant circuit .............. 13 6.

  • Page 6: Features

    MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual 1. Features  High capacity of hot water producing,  High efficient, COP is up to 4.04 (39kW) and 4.00 (80kW).  Unit applies refrigerant heating technology to increase the total energy absorb.

  • Page 7: Specifications

    Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 2. Specifications Model RSJ-420/SZN1-H Power supply 380-415V~, 3Ph, 50Hz Capacity 39.0 Water heating Input 9.65 4.04 Running ambient temperature -15 º C～46 º C Outlet water temperature Default 56º C, 40 º C～60 º C Rated input 14.5...
  • Page 8 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual Continues Model RSJ-420/SZN1-H Inlet pipe DN32 Water pipe Outlet pipe DN32 Hot water yield 0.85 Dimension (W×H×D) 1,015×1,775×1,026 Packing (W×H×D) 1,070×1,900×1,030 Net/Gross weight 323/343 Notes: The heating capacity is tested under a standard ambient with temperature of outdoor 20 º C(DB)/15 º C(WB), inlet water temperature of the unit is 15 º...

  • Page 9: Dimensions (Unit: Mm)

    Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 Continues Model RSJ-800/SZN1-H Model SH120A4ALC Type Scroll Brand Danfoss Quantity Capacity 29.95 Compressor Input 9,462 Rated current (RLA) 20.7 Locked rotor Amp.(LRA) Thermal protector Internal Refrigerant oil 3,300 Controller KJR-51/BMKE-A (Wired controller) ≥25,000...
  • Page 10 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual RSJ-800/SZN1-H Top view...

  • Page 11: Service Space (Unit: Mm)

    Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 4. Service Space (Unit: mm) RSJ-420/SZN1-H...
  • Page 12 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual RSJ-800/SZN1-H...

  • Page 13: Refrigerant Circuit

    Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 5. Refrigerant circuit RSJ-420/SZN1-H...
  • Page 14 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual RSJ-800/SZN1-H...

  • Page 15: Wiring Diagrams

    Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 6. Wiring Diagrams RSJ-420/SZN1-H...
  • Page 16 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual Item Detail Communication port for other unit Communication port for wired controller System low pressure protection connector System high pressure protection connector E-heater Temp. Sensor of refrigerant connector Water tank (pook) Temp. sensor connector, only the host is valid, the slave is invalid Water outlet Temp.
  • Page 17 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 T3: Evaporator Temp. sensor connector T4: Outdoor ambient Temp. sensor connector Detection port for compressor current S3-1: Remote ON/OFF functional status (OFF: inactive (default); ON: active) S3-2: Defrost periodical choice (OFF: default time by program; ON: 28 minutes)
  • Page 18 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual One-way solenoid control port. 4-way valve control power. Left side: Circulating water pump control; right side: E-heater control. Only supply ON/OFF signal, not supply power signal. Right side: Remote alarm signal output. Only supply non-source ON/OFF signal, not supply power signal.
  • Page 19 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 RSJ-800/SZN1-H...
  • Page 20 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual Item Detail Communication port for other unit Communication port for wired controller System low pressure protection connector System high pressure protection connector E-heater Temp. Sensor of refrigerant connector Water tank (pook) Temp. sensor connector, only the host is valid, the slave is invalid.
  • Page 21 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 Address dial code 0~1 separately stands for address 0~1, means 0~1 set units. When dial the dial switch to 2 or more, then it will invalid. Each module of water heat pump has the electric control function. Set the host unit through the address dial code on electric control board.

  • Page 22: Electric Characteristics

    MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual Electric proportional valve connector. Transformer output connector. Power connector for wired controller. Remote control port. Water flow switch connector. Notes: RSJ-800/SZN1-H has two same PCB boards. Here only explains one PCB board.

  • Page 23: Capacity Table

    Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 8. Capacity Table RSJ-420/SZN1-H OT(℃) Outlet water Temp. Mode Capacity(kW) Inlet water Temp. (℃) (℃) 55.72 6.36 55.40 6.00 54.75 5.64 54.58 5.28 52.46 5.03 56.99 6.50 55.14 5.89 55.00...
  • Page 24 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual RSJ-800/SZN1-H Note: OT – Outdoor Temperature (DB); OT(℃) Outlet water Temp. Mode Capacity(kW) Inlet water Temp. (℃) (℃) 102.34 5.74 102.02 5.42 101.36 5.09 100.39 4.76 99.08 4.44 102.27 5.78...

  • Page 25: Accessories

    Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 9. Accessories Name Qty. Purpose Installation & operation manual Water tank temperature sensor For water tank temperature inspection. Wired controller Control the unit and display unit status. Wire harness matched with wired controller Connect the master unit with wired controller.

  • Page 26: Part. 3 Installation

    MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual Part. 3 Installation 1. Safety information ............... 27 2. Unit Installation ..............28 3. Trial run ................44 4. Fault analysis and solutions ..........46 5. Maintenance ............... 59...

  • Page 27: Safety Information

    Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 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 28: Unit Installation

    MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual similarly qualified person.  Do not dispose this product as unsorted municipal waste. Collection of such waste separately for special treatment is necessary. Do not dispose of electrical appliances as unsorted municipal waste, use separate collection facilities.
  • Page 29 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 2.1 Unit outlook RSJ-420/SZN1-H RSJ-800/SZN1-H 2.2 Carrying of unit  Handling rope should at least can bear 3 times of the unit weight, and must go through the handling holes shown in following pictures, and make sure there is enough strength to add a...
  • Page 30 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual pad between the rop and unit in order to protect the unit.  Distance between the hood and air outlet mesh shoule be more than 1 meter, and ensure that the hood has enough strength as well as reliability in handling process.
  • Page 31 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506  The installed unit should be sheltered from direct sunlight as much as possible, and be far away from boiler flues and ambient air which may erode condenser coils and copper tube parts of the unit, such as the places that full of dust and oil fume.
  • Page 32 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual RSJ-800/SZN1-H 2.5 Unit installation space  Ensure enough space for installation and maintenance. RSJ-420/SZN1-H (Unit: mm) RSJ-800/SZN1-H (Unit: mm)
  • Page 33 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506  Ensure there is enough air flow to supply the heat exchanger, Take influence of down draft caused by tall building around the unit to air discharge into condenser when installing.
  • Page 34 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual 2.6 Water pipeline system  Water pipe joint specifications of single unit. Water inlet pipe joint Water outlet pipe joint RSJ-420/SZN1-H DN32 DN32 RSJ-800/SZN1-H DN50 DN50  Water pipeline system design and construction must meet the national water and heating pipeline design requirements and relative standards.
  • Page 35 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506  Connection diagrammatic drawing of water pipe system Icon specifications: Stop valve Motor operated valve Flexible rubber joint (soft-connect) Water pump Water using end Water supply controller Solenoid valve...
  • Page 36 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual Double units drawing: RSJ-800/SZN1-H Single unit drawing:...

  • Page 37: Water Tank Temperature Sensor

    Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 Double units drawing: 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 38 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual  Water cycle pump selection: RSJ-420/SZN1-H Circulative heating rated water flow Water resistance of circulative rated water flow 160 kPa 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;...
  • Page 39 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 E-heater.  The selection of auxiliary heater is only for reconmendation, and the selection of auxiliary heater can be selected according to the actual conditions.  Make sure E-heater is covered with water all the time.

  • Page 40: Wired Controller

    MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual RSJ-800/SZN1-H Power supply 380-415V, 3Ph, 50Hz Wire size (˂30m) 25mm Min. wire size (metal pipe & synthetic resin pipe wire) Ground wire 25mm Capacity 125A Manual switch Fuse 100A Leakage protector 30mA 0.1sec below...
  • Page 41 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 Multi-units: RSJ-420/SZN1-H RSJ-800/SZN1-H...
  • Page 42 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual  Electric wiring figure  Electric control schematic diagram of the unit (Only for reference)
  • Page 43 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 When power supply wire of the wired controller is less than 20m, wiring can be applied as the location shown as imaginary lines, when it it exeeds 20m, the power adapter is necessery.

  • Page 44: Trial Run

    MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual  Dial code specification S3-1: Remote ON/OFF functional status (OFF: inactive (default); ON: active). S3-2: Defrost periodical choice (OFF: default time by program; ON: 28 minutes). S3-3,4: Auxiliary heater choice (OFF: indicates 0, ON indicates 1, the factory default is 00).
  • Page 45 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 Whether the filter is clean. Whether the water drain is smoothly. Whether complete the heat insulation of the water pipe. Whether vacuum the pipeline of water side. Whether all the valves in the water side pipeline are under correct status.

  • Page 46: Fault Analysis And Solutions

    MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual 4. Fault analysis and solutions Not distribute to malfunction Phenomena Cause When the unit is defrosting, the sound of the 4-way valve being shifted. Air supply motor stop automatically to defrost.
  • Page 47 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 Need to check again Phenomena Cause Detect the timer whether be given wrong operation. Stop operation or drive up automatically Detect anti-freezing mode is opened. Whether the power is cut.
  • Page 48 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual 2. Damages of the compressor inner Change the compressor. components. Water pump not operated or abnormal operated Possible reason Detect and settle measure 1. Power errors. Check and repair.
  • Page 49 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 Error Reason code Power phase sequence error. Communication error of host unit and wired controller, main unit and slave unit. Error of water outlet temperature sensor (T1). Error of water temperature sensor in the water tank (only host unit displays) (T5).
  • Page 50 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual 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 51 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 Host unit: 0~4; 0˂S4, S4≤1˂S3, S3≤2˂S2, Water level height S2≤3˂S1, 4≥S1. Slave: --. Standby, stop: 0; Directly heat type: 1; Circulation type: 2; Defrosting: dF; Operating mode Anti-freezing: db; Remote ON/OFF signal closure: d8.
  • Page 52 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual 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).
  • Page 53 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 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 54 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual P0: System low pressure protection...
  • Page 55 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 P1: System high pressure protection...
  • Page 56 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual P2: Compressor current of system is overload Notes: the value of Io is 30A.
  • Page 57 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 P4: Protection for discharge Hi-temperature (Tp≥115º C)
  • Page 58 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual 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 59: Maintenance

    Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 C1: Compressor current is less than 2A during operation 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 60 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual  Often check the working situation of each part in the unit, and check the inner pipe connectors of the unit and whether the high and low pressure detecition ports of the refrigerant has oil dirty, to make sure the unit has no refrigerant leakage.
  • Page 61 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 PH value Total hardness Electrical conductivity Sulphate ion ˂50ppm ˂200μs/cm (25ºC) ˂50ppm 6.5-8.0 Silicon Iron content Sulfide ion Chloride ion ˂30ppm ˂0.3ppm ˂50ppm None Ammonia ion Sodium ion Calcium ion ˂50ppm...

  • Page 62: Part. 4 Controller

    MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual Part. 4 Controller 1. Wired Controller (Standard) ..........63...
  • Page 63 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 1. Wired Controller (Standard) 1.1 Wired controller 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 1. Touch key operation.
  • Page 64 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual 3. Setting temperature: 3 statuses can be displayed - 4. Timing ON/OFF indication ( ): Indicate the timing information. 5. Function icon:  : Display when water heater system connects to Modbus network;...
  • Page 65 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 temperature setting status displays the setting value; under cycle heating water temperature setting status displays the setting value; under check status displays check parameter. 10. ON/OFF key ( ): Turn on and turn off functions.
  • Page 66 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual 1.3.2 Setting operating modes and parameters  Press SET key to enter the operation mode and parameters setting. The setting contents will change as the following order each time the key is pressed.
  • Page 67 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506  Timing setting  3 timing periods can be set on the wired controller; Timer 1, Timer 2, Timer 3. These 3 timers can control the main unit to be turned on and off 3 times at most during a day.
  • Page 68 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual  At this time the hour of the clock will flash, it means the current setting is the hour of the Timer 2 on. And the follow setting method will be the same as the Timer 1.
  • Page 69 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 Check timing information: to check the timing which has been set, press key under main page, the on and off time of Timer 1, Timer 2 and Timer 3 will be displayed in turns.
  • Page 70 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual 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 ▲ or ▼ key to adjust, press OK key when finished or wait for 7 seconds to confirm.
  • Page 71 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 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 72 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual protection information of the main unit.  Enter method: press and hold SET key for 3 seconds to enter check interface, as the figure display:  Press the ▲ or ▼ key to adjust the main unit serial number and check 16 unit’s status information from #0~#15.
  • Page 73 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 1.3.5 Error handling  When the unit has error or protection, the icon will flash. Press and hold SET key for 3 seconds to enter check status and then press the ▲ or ▼ key to check the unit of #0~#15.
  • Page 74 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual  Do not install the unit in a place with much oil, steam, sulfide gas. Otherwise, the product may deform and fail. 1.4.2 Preparation before installation: Check whether the following assemblies are complete: Name Qty.
  • Page 75 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506 1.4.4 Wire connection There are two methods to connection between wired controller and main unit. 1.4.5 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.
  • Page 76 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual  Use three M4×20 screws to directly install the back cover on the wall.  Use two M4×25 screws to install the back cover on the 86 electrician box, and use one M4×20 screw for fixing on the wall.
  • Page 77 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506  Over fasten the screw will lead to deformation of back cover. 1.4.6 Wire outlet Avoid the water enter into the wired controller, use trap and putty to seal the connectors of wires during wiring installation.
  • Page 78 MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual 1.4.7 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.  Correct install the back cover and firmly buckle the front cover and back cover,...

This manual is also suitable for:

Rsj-800/szn1-hKjr-51/bmke-a

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