Mitsubishi Heavy Industries SRK20ZJ-S Data Book
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Mitsubishi Heavy Industries SRK20ZJ-S Data Book

Inverter wall mounted type room air-conditioners
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See also: Service Manual , Technical Manual
DATA BOOK
INVERTER WALL MOUNTED TYPE
ROOM AIR-CONDITIONERS
(Split system, air to air heat pump type)
SRK20ZJ-S
25ZJ-S
35ZJ-S
DRAFT
Manual No.'09•SRK-DB-087D

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Summary of Contents for Mitsubishi Heavy Industries SRK20ZJ-S

  • Page 1 DRAFT Manual No.'09•SRK-DB-087D DATA BOOK INVERTER WALL MOUNTED TYPE ROOM AIR-CONDITIONERS (Split system, air to air heat pump type) SRK20ZJ-S 25ZJ-S 35ZJ-S...

  • Page 2: Table Of Contents

    '09•SRK-DB-087D CONTENTS 1 SPECIFICATIONS ..................2 2 EXTERIOR DIMENSIONS ................5 3 ELECTRICAL WIRING ................7 4 NOISE LEVEL ..................9 5 PIPING SYSTEM ..................12 6 APPLICATION DATA ................13 (1) Installation of indoor unit ..............13 (2) Installation of outdoor unit ..............17 7 RANGE OF USAGE & LIMITATIONS ............24 8 CAPACITY TABLES................26 REFERENCE 1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ..27...

  • Page 3: Specifications

    '09•SRK-DB-087D 1 SPECIFICATIONS Adapted to RoHS directive SRK20ZJ-S Model Item Indoor unit SRK20ZJ-S Outdoor unit SRC20ZJ-S Cooling capacity (1) 2000 (1000 (Min.) ~ 2700 (Max.)) Heating capacity (1) 2700 (1200 (Min.) ~ 3900 (Max.)) Power supply 1 Phase, 220 ~ 240 V, 50Hz Cooling 0.44 (0.21 ~ 0.77)
  • Page 4 '09•SRK-DB-087D Adapted to RoHS directive SRK25ZJ-S Model Item SRK25ZJ-S SRC25ZJ-S Indoor unit Outdoor unit Cooling capacity (1) 2500 (1000 (Min.) ~ 2900 (Max.)) Heating capacity (1) 3200 (1200 (Min.) ~ 4200 (Max.)) Power supply 1 Phase, 220 ~ 240 V, 50Hz Cooling 0.62 (0.21 ~ 0.88) Power...
  • Page 5 '09•SRK-DB-087D Adapted to RoHS directive SRK35ZJ-S Model Item SRK35ZJ-S SRC35ZJ-S Indoor unit Outdoor unit Cooling capacity (1) 3500 (1000 (Min.) ~ 3800 (Max.)) Heating capacity (1) 4000 (1300 (Min.) ~ 4800 (Max.)) Power supply 1 Phase, 220 ~ 240 V, 50Hz Cooling 1.01 (0.21 ~ 1.24) Power...
  • Page 6 Symbol Content 14.5 Gas piping φ9.52(3/8") (Flare) Liquid piping φ6.35(1/4") (Flare) (φ65) Hole on wall for right rear piping (φ65) Hole on wall for left rear piping Drain hose VP16 Outlet for wiring Outlet for piping(on both side) Wireless remote controller Outlet for down piping 17.3 (Refer to the above view)
  • Page 7 Notes 50.6 (1) It must not be surrounded by walls on the four sides. (2) The unit must be fixed with anchor bolts. An anchor bolt must not 390.6 protrude more than 15mm. (3) Where the unit is subject to strong winds, lay it in such a direction that the blower outlet faces perpendicularly to the dominant wind direction.

  • Page 8: Electrical Wiring

    Description Item CNE-CNY Connector Fan motor Flap motor Louver motor Humidity sensor Room temp. sensor Heat exch. sensor Diode stack Fuse PRINTED Terminal block CIRCUIT Varistor BOARD HEAT EXCHANGER Mark Color 250V 3.15A Black Blue White Yellow Yellow/Green HEAT EXCHANGER DISPLAY WIRELESS R-AMP...

  • Page 9: Specifications

    TO INDOOR UNIT POWER WIRES SIGNAL WIRE PWB ASSY POWER SOURCE T1 T2 POWER TRANSISTOR 1〜220-240V 50Hz/1〜220V 60Hz t° 250V 15A (BK) R.IN (RD) ＋ ＋ NOISE (WH) 250V 20A FILTER 3～ (BK) (WH) S.IN F3 250V 1A (Y/G) (RD) CIRCUIT (Y/G) CNFAN...

  • Page 10: Noise Level

    '09•SRK-DB-087D 4 NOISE LEVEL Condition ISO-T1, JIS C9612 Model SRK20ZJ-S (Indoor Unit) Model SRK20ZJ-S Cooling 33 dB(A) Noise Level Heating 36 dB(A) × ..Cooling　 Heating Mid Octave Band frequency(Hz) (Outdoor Unit) Model SRC20ZJ-S Cooling 47 dB(A) Noise Level Heating 46 dB(A) ×...
  • Page 11 '09•SRK-DB-087D Model SRK25ZJ-S Condition ISO-T1, JIS C9612 (Indoor Unit) Model SRK25ZJ-S 34 dB(A) Cooling Noise Level Heating 39 dB(A) × ..Cooling　 Heating Mid Octave Band frequency(Hz) (Outdoor Unit) Model SRC25ZJ-S Cooling 48 dB(A) Noise Level 49 dB(A) Heating × ..Cooling　 Heating Mid Octave Band Frequency(Hz)
  • Page 12 '09•SRK-DB-087D Model SRK35ZJ-S Condition ISO-T1, JIS C9612 (Indoor Unit) Model SRK35ZJ-S 42 dB(A) Cooling Noise Level Heating 43 dB(A) × ..Cooling　 Heating Mid Octave Band frequency(Hz) (Outdoor Unit) Model SRC35ZJ-S Cooling 50 dB(A) Noise Level 51 dB(A) Heating × ..Cooling　 Heating Mid Octave Band Frequency(Hz)

  • Page 13: Piping System

    '09•SRK-DB-087D 5 PIPING SYSTEM Models SRK20ZJ-S, 25ZJ-S Cooling cycle Heating cycle Indoor unit Outdoor unit Outdoor air Flare temp. sensor connection Service valve (TH2) (Gas) Discharge pipe temp. sensor Gas pipie Check joint Heat Muf fler (TH3) (φ9.52) Room temp.

  • Page 14: Application Data

    6 APPLICATION DATA RLA012A012 WARNING • Do not vent R410A into the atmosphere : R410A is a fluorinated • Do not perform any change of protective device itself or its setup (1) Installation of indoor unit greenhouse gas, covered by the Kyoto Protocol with Global condition.

  • Page 15: Selection Of Installation Location

    Poisonous gases will flow into the room through drainage pipe and This may cause fire or electric shock due to defecting contact, defecting set or radio receiver is placed within 1m). system is in operation. seriously affect the user’s health and safety. insulation and over-current etc.
  • Page 16 Fixing of indoor unit Since this air conditioner has been designed to collect dew drops on the rear Gutter surface to the drain pan, do not attach the power cord above the gutter. • How to remove the indoor unit from the installation board Latch (2 locations) Installation Steps Wall...
  • Page 17 illustration, hold the panel at both ends of lower Tighten the 2 set screws. part, lower it downward slowly, then push it Fit the air filter. slightly until the latch works. Fit the air inlet panel. Set screws ELECTRICAL WIRING WORK Installing the air-cleaning filters Screw Preparation of indoor unit...

  • Page 18: Installation Of Outdoor Unit

    RWC012A030A Model 20 · 25 · 35 (2) Installation of outdoor unit R410A REFRIGERANT USED • This installation manual deals with outdoor units and general installation specifications only. For indoor units, refer to page 13. • When install the unit, be sure to check whether the selection of installation place, power supply specifications, usage limitation (piping length, height differences between indoor and outdoor units, power supply voltage and etc.) and installation spaces.
  • Page 19 • Do not processing, splice the power cord, or share a socket Touching rotating equipments, hot surfaces or high voltage parts can component can cause fire or burst. with other power plugs. cause personal injury due to entrapment, burn or electric shocks. This may cause fire or electric shock due to defecting contact, defecting insulation and over-current etc.
  • Page 20 Notabilia as a unit designed for R410A Do not use any refrigerant other than R410A. R410A will rise to pressure about 1.6 times higher than that of a conventional refrigerant. A cylinder containing R410A has a pink indication mark on the top. A unit designed for R410A has adopted a different size indoor unit operation valve charge port and a different size check joint provided in the unit to prevent the charging of a wrong refrigerant by mistake.
  • Page 21 ying 2. REFRIGERANT PIPING WORK rate 2. REFRIGERANT PIPING WORK rate 1) Restrictions on unit installation and use 1) Restrictions on unit installation and use Check the following points in light of the indoor unit specifications and the installation site. Observe the following restrictions on unit installation and use.
  • Page 22 flare nut onto it. Flare dimensions for R410A are different from those for conventional R407C. Copper In the case of a rigid (clutch) type Although we recommend the use of flaring tools designed specifically for R410A, conventional Screw pipe outer With an R410A tool With a conventional tool diameter flaring tools can also be used by adjusting the measurement of protrusion B with a protrusion...

  • Page 23: Drain Piping Work

    Wrap indoor units’ flare joints with heat insulating parts (pipe cover) for heat insulation (both gas and liquid pipes). and outdoor units Give heat insulation to both gas and liquid side pipes. Bundle a heat insulating material and a pipe tightly together so that no gaps may be left between them and wrap them Gas piping together with a connecting cable by a dressing tape.

  • Page 24: After Installation

    Polychloroprene rubber conductors insulation Do not lay electronic control cables (remote control and signaling wires) and other cables together outside the unit. Laying them together can result Stranded core in the malfunctioning or a failure of the unit due to electric noises. 4or5 Number of conductors Fasten cables so that may not touch the piping, etc.

  • Page 25: Selection Chart

    '09•SRK-DB-087D 7 RANGE OF USAGE & LIMITATIONS Models Item Cooling operation : Approximately 18 to 32℃ D.B. Indoor return air temperature Heating operation : Approximately 10 to 27℃ D.B. (Upper, lower limits) (Refer to the selection chart) Cooling operation : Approximately -15 to 46℃ D.B. Outdoor air temperature Heating operation : Approximately -15 to 21℃...
  • Page 26 '09•SRK-DB-087D (2) Correction of cooling and heating capacity in relation to one way length of refrigerant piping It is necessary to correct the cooling and heating capacity in relation to the one way piping length between the indoor and outdoor units.

  • Page 27: Capacity Tables

    '09•SRK-DB-087D 8 CAPACITY TABLES Model SRK20ZJ-S Cool Mode Heat Mode Indoor air temp Indoor air temp outdoor 21˚CDB 23˚CDB 26˚CDB 27˚CDB 28˚CDB 31˚CDB 33˚CDB Outdoor Air flow air temp. Air flow air temp. 14˚CWB 16˚CWB 18˚CWB 19˚CWB 20˚CWB 22˚CWB 24˚CWB 16˚CDB...

  • Page 28: Reference

    '09•SRK-DB-087D Reference 1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 1. Operation control function by remote controller Operation section FAN SPEED button OPERATION MODE select button Each time the button is pressed, the Each time the button pressed, the display is switched over in turn. display is switched over in turn.

  • Page 29: Auto Restart Function

    '09•SRK-DB-087D 2. Unit ON/OFF button When the remote controller batteries become weak, or if the remote controller is lost or malfunctioning, this button may be used to turn the unit on and off. (1) Operation Push the button once to place the unit in the automatic mode. Push it once more to turn the unit off. (2) Details of operation The unit will go into the automatic mode in which it automatically determines, from indoor temperature (as detected by sensor), whether to go into the cooling, thermal dry or heating modes.

  • Page 30: Flap And Louver Control

    '09•SRK-DB-087D 5. Flap and louver control   Control the flap and louver by AIR FLOW (UP/DOWN) and (LEFT/RIGHT) button on the wireless remote controller.   (1) Flap   Each time when you press the AIR FLOW (UP/DOWN) button the mode changes as follows. (Flap stopped) (Swing) Angle of Flap from Horizontal...

  • Page 31: D Auto Operation

    '09•SRK-DB-087D 6. 3D auto operation Control the flap and louver by D AUTO button on the wireless remote controller. Air f low selection and air flow direction are automatically controlled, allowing the entire indoor to efficiently conditioned. (1) During Cooling and Heating (Including auto cooling and heating) (a) Air f low selection is determined according to indoor temperature and setting temperature.

  • Page 32: Timer Operation

    '09•SRK-DB-087D 7. Timer operation (1) Comfortable timer setting (ON timer) If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in auto mode operation is selected, the comfortable timer starts and determines the starting time of next operation based on the initial value of  minutes and the relationship between the indoor temperature at the setting time (temperature of room temperature sensor) and the setting temperature.

  • Page 33: Outline Of Heating Operation

    (a) Fuzzy operation Deviation between the indoor temperature setting correction temperature and the return air temperature is calculated in accordance with the fuzzy rule, and used for control of the air capacity and the compressor speed. Model SRK20ZJ-S SRK25ZJ-S SRK35ZJ-S Fan speed...

  • Page 34: Outline Of Cooling Operation

    (a) Fuzzy operation During the fuzzy operation, the air f low and the compressor speed are controlled by calculating the difference between the indoor temperature setting correction temperature and the return air temperature. Model SRK20ZJ-S SRK25ZJ-S SRK35ZJ-S Fan speed 20~66rps...

  • Page 35: Protective Control Function

    '09•SRK-DB-087D 12. Protective control function (1) Frost prevention control (During cooling or dehumidifying) (a) Operating conditions Indoor heat exchanger temperature (Th) is lower than ºC. compressor command  minutes after reaching the compressor command speed except 0 rps. speed (b) Detail of anti-frost operation Lower Indoor heat exchanger limit...
  • Page 36 '09•SRK-DB-087D (4) Cooling low outdoor air temperature protective control (a) Operating conditions: When the outdoor air temperature (TH) is ºC or lower continues for 0 seconds while the compressor command speed is other than 0 rps. (b) Detail of operation: The lower limit of the compressor command speed is set to 0 <>...
  • Page 37 '09•SRK-DB-087D (6) Heating overload protective control (a) Indoor unit side 1) Operating conditions : When the outdoor air temperature (TH) is ºC or higher continues for 0 seconds while the compressor command speed other than 0 rps. The indoor fan is stepped up by  speed step. (Upper limit th speed) 2) Detail of operation : The outdoor air temperature (TH) is lower than ºC.
  • Page 38 '09•SRK-DB-087D (8) Compressor overheat protection (a) Purpose: It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the compressor overheat. (b) Detail of operation 1) Speeds are controlled with temperature detected by the sensor (TH) mounted on the discharge pipe. (Example) Fuzzy  rps After lapse of 0 second or over...
  • Page 39 '09•SRK-DB-087D (13) Serial signal transmission error protection (a) Purpose: Prevents malfunction resulting from error on the indoor ↔ outdoor signals. (b) Detail of operation: If the compressor is operating and a serial signal cannot be received from the indoor control with outdoor control having serial signals continues for  minute and  seconds, the compressor is stopped.

  • Page 40: Troubleshooting Procedures For Electrical Equipment

    '09•SRK-DB-087D Reference Reference 2 TROUBLESHOOTING PROCEDURES FOR ELECTRICAL EQUIPMENT (1) Cautions (a) If you are disassembling and checking an air conditioner, be sure to turn off the power before beginning. When working on indoor units, let the unit sit for about  minute after turning off the power before you begin work. When working on an outdoor unit, there may be an electrical charge applied to the main circuit (electrolytic condenser), so begin work only after discharging this electrical charge (to DC 10 V or lower).
  • Page 41 '09•SRK-DB-087D (4) Troubleshooting procedure (If the air conditioner runs) Conf irm the contents of the customer complaint. The cause of the trouble can be specifically identified. Eliminate the cause of the trouble and perform an Check the self-diagnosis display. operation check. See page .
  • Page 42 '09•SRK-DB-087D (5) Self-diagnosis table When this air conditioner performs an emergency stop, the reason why the emergency stop occurred is displayed by the flashing of display lights. If the air conditioner is operated using the remote controller  minutes or more after the emergency stop, the trouble display stops and the air conditioner resumes operation.
  • Page 43 '09•SRK-DB-087D (6) Service mode (Trouble mode access function) This air conditioner is capable of recording error displays and protective stops (service data) which have occurred in the past. If self-diagnosis displays cannot be confirmed, it is possible to get a grasp of the conditions at the time trouble occurred by checking these service data.
  • Page 44 '09•SRK-DB-087D *3: To count the number of flashes in the service mode, count the number of flashes after the light lights up for 1.5 second initially (start signal). (The time that the light lights up for . second (start signal) is not counted in the number of flashes.) In the case of current cut (example: stop code 42’’) The RUN light (10’...

  • Page 45: Remote Controller Setting

    '09•SRK-DB-087D (Example) Remote controller setting Operation Displayed data Temperature Fan speed switching switching setting Cooling Displays the reason for the stop (error code) the previous time an error was displayed. 21ºC 22ºC Displays the reason for the stop (error code) 2 times previous when an error was displayed. Displays the reason for the stop (error code) 3 times previous when an error was displayed.
  • Page 46 '09•SRK-DB-087D (c) Error code, stop code table (Assignment of error codes and stop codes is done in common for all models.) Number of flashes when in service mode Stop coad Error Auto TIMER Error content Cause Occurrence conditions display recovery light light Error coad...
  • Page 47 '09•SRK-DB-087D Note (1) The number of flashes when in the Service Mode do not include the 1.5 second period when the lights light up at f irst (starting signal). (See the example shown below.) In the case of current cut (example: stop code 42’’) The RUN light (10’...
  • Page 48 '09•SRK-DB-087D (e) Room temperature sensor, indoor heat exchanger sensor, outdoor air temperature sensor, outdoor heat exchanger sensor table Units: °C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) * If no data are recorded (error code is normal), the display for each sensor becomes as shown below. Sensor value displayed when the error code is normal Sensor name -64ºC...
  • Page 49 '09•SRK-DB-087D Discharge pipe sensor table Units: °C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) * If no data are recorded (error code is normal), the display for each sensor becomes as shown below. Sensor value displayed when the error code is normal Sensor name -64ºC...
  • Page 50 '09•SRK-DB-087D Service data record form Model Customer Date of investigation Machine name Content of complaint Remote controller settings Display results Display content Content of displayed data Temperature setting Operation switching Fan speed switching Buzzer (Yes/No.) RUN light (Times) TIMER light (Times) Error code on previous occasion.
  • Page 51 '09•SRK-DB-087D (7) Inspection procedures corresponding to detail of trouble Sensor error Broken sensor wire, connector poor connection Is connector connection good? Correct connection. Is sensor resistance value good? Replace sensor. Replace PCB. ◆ Sensor temperature characteristics (Room ◆ Discharge pipe sensor temperature characteristics temp., indoor heat exchanger temp., out- door heat exchanger temp., outdoor air temp.)

  • Page 52: Current Cut

    '09•SRK-DB-087D Current cut Compressor lock, Compressor wiring short circuit, Compressor output is open phase, Outdoor PCB is faulty, Service valve is closed, EEV is faulty, Compressor faulty. In the service valves of the outdoor Open the service valves unit open? Secure space for inlet and Is there any shortcircuit? outlet.

  • Page 53: Over Heat Of Compressor

    '09•SRK-DB-087D Over heat of compressor Gas shortage, defective discharge pipe sensor Connector connection check, resistance Is discharge pipe sensor value check, replacement of discharge pipe resistance value good? sensor (page 0) Check if there are any Does trouble persist after Is sufficient quantity of refrigerant places where gas is leaking.
  • Page 54 '09•SRK-DB-087D Trouble of outdoor unit Insufficient refregerant amount, Faulty power transistor, Broken compressor wire Service valve close, Defective EEV, Defective outdoor PCB Check power supply. Is the power supply voltage OK? Proper power supply voltages are as follows. (At the power supply outlet) 220V : 198~242V 230V : 207~253V 240V : 216~264V...
  • Page 55 '09•SRK-DB-087D Outdoor fan motor error Defective fan motor, connector poor connection, defective outdoor PCB Is connector connection good? Correct connector connection Is fan motor resistance value good? * Disconnect the fan motor connector, then investigate the fan motor and outdoor PCB separately.
  • Page 56 '09•SRK-DB-087D (b) Outdoor unit Phenomenon Operation Sensor mode Shortcircuit Disconnected wire System can be operated normally. Compressor stop. Cooling Heat exchanger sensor Defrosting is not performed. Defrosting is performed for 0 minutes at approx.  minutes. Heating System can be operated normally. Compressor stop.
  • Page 57 '09•SRK-DB-087D (C) Power transistor inspection procedure [Use a tester with a needle indicator for the inspection. (Do not use a digital tester. Check in the AC 300 volt range.)] (1) If there is a self-diagnosis display, inspect the compressor system (burns, wiring mistakes, etc.) If no problems are found, check the output of the power transistor.
  • Page 58 CAUTION- HIGH VOLTAGE High voltage is produced in the control box. Don't touch electrical parts in the control box for 5 minutes after the unit is stopped. Color symbol Inspection power transistor Black Remove the fasten terminal and test output voltage Orange Indoor unit White...
  • Page 59 '09•SRK-DB-087D (a) Inspection of electronic expansion valve Electronic expansion valve operates for approx. 0 seconds after the power on, in order to determine its aperture. Check the operating sound and voltage during the period of time. (Voltage cannot be checked during operation in which only the aperture change occurs.) 　...
  • Page 60 ROOM AIR-CONDITIONERS Air-Conditioning & Refrigeration Systems Headquarters 16-5, 2-chome, Kounan, Minato-ku, Tokyo, 108-8215, Japan Fax : (03) 6716-5926 Because of our policy of continuous improvement, we reserve the right to make changes in all specifications without notice. Copyright MITSUBISHI HEAVY INDUSTRIES.LTD...

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