Mitsubishi Heavy Industries SRK25ZJP-S User Manual
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Mitsubishi Heavy Industries SRK25ZJP-S User Manual

Inverter wall mounted type residential air-conditioners (split system, air to air heat pump type)
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TECHNICAL MANUAL
INVERTER WALL MOUNTED TYPE
RESIDENTIAL AIR-CONDITIONERS
(Split system, air to air heat pump type)
SRK25ZJP-S
SRK35ZJP-S
SRK50ZJP-S
Manual No.'10•SRK-T-100

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  • Page 1 Manual No.'10•SRK-T-100 TECHNICAL MANUAL INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS (Split system, air to air heat pump type) SRK25ZJP-S SRK35ZJP-S SRK50ZJP-S...

  • Page 2: Table Of Contents

    '10 • SRK-T-099 '10 • SRK-T-100 CONTENTS 1. SPECIFICATIONS ..................2. EXTERIOR DIMENSIONS ................(1) Indoor units ..................(2) Outdoor units ..................(3) Wireless remote controller ..............3. ELECTRICAL WIRING ................. 10 (1) Indoor units ..................10 (2) Outdoor units ..................
  • Page 3 '10 • SRK-T-099 '10 • SRK-T-100 (8) Phenomenon observed after shortcircuit, wire breakage on sensor ..53 ........... 53 (9) Checking the indoor electrical equipment (10) How to make sure of wireless remote controller ........54 (11) Outdoor unit inspection points .............. 55 ■How to read the model name Example: SRK 25 Z JP-S...

  • Page 4: Specifications

    '10 • SRK-T-100 1. SPECIFICATIONS Adapted to RoHS directive SRK25ZJP-S Model Item Indoor unit SRK25ZJP-S Outdoor unit SRC25ZJP-S Cooling capacity (1) 2500 (1000 (Min.)~2700 (Max.)) Heating capacity (1) 3200 (1200 (Min.)~4200 (Max.)) Power supply 1 Phase, 220~240 V, 50Hz Cooling 0.71 (0.21~0.88)
  • Page 5 '10 • SRK-T-100 Adapted to RoHS directive SRK35ZJP-S Model Item Indoor unit SRK35ZJP-S Outdoor unit SRC35ZJP-S Cooling capacity (1) 3500 (1000 (Min.)~3700 (Max.)) Heating capacity (1) 4000 (1300 (Min.)~4800 (Max.)) Power supply 1 Phase, 220~240 V, 50Hz Cooling 1.06 (0.21~1.24) Power consumption Heating...
  • Page 6 '10 • SRK-T-100 Adapted to RoHS directive SRK50ZJP-S Model Item Indoor unit SRK50ZJP-S Outdoor unit SRC50ZJP-S Cooling capacity (1) 5000 (1600 (Min.)~5500 (Max.)) Heating capacity (1) 5800 (1600 (Min.)~6600 (Max.)) Power supply 1 Phase, 220~240 V, 50Hz Cooling 1.56 (0.40~2.20) Power consumption Heating...

  • Page 7: Exterior Dimensions

    Symbol Content 17.5 Model 25,35 9.52 3 8" Flare Gas piping Model 50 12.7 1 2" Flare Liquid piping 6.35 1 4" Flare Hole on wall for right rear piping Hole on wall for left rear piping Drain hose VP16 Outlet for wiring Outlet for piping on both side Outlet for down piping...

  • Page 8: Outdoor Units

    50.6 Notes 1 It must not be surrounded by walls on the four sides. 390.6 2 The unit must be fixed with anchor bolts. An anchor bolt must not protrude more the 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 9 Notes （1） It must not be surrounded by walls on the four sides. Symbol Content （2） The unit must be fixed with anchor bolts. An anchor bolt must not Service valve connection（gas side） φ12.7（1／2"）（Flare） protrude more the 15mm. Service valve connection（liquid side） φ6.35（1／4"）（Flare）...

  • Page 10: Wireless Remote Controller

    '10 • SRK-T-100 (3) Wireless remote controller Unit: mm 17.3...

  • Page 11: Electrical Wiring

    POWER SOURCE ～220／230／240V 50Hz Item Description CNE-CNU Connector CONTROL Fan motor Flap motor Humidity sensor Room temp. sensor HEAT EXCHANGER Heat exch. sensor 1 3 4 5 Diode stack Fuse Terminal block Varistor 52C-4 250V 3.15A Mark Color Black Blue 52C-3 White PRINTED CIRCUIT...

  • Page 12: Outdoor Units

    TERMINAL PWB ASSY BLOCK POWER T1 T2 TRANSISTOR t゜ 250V 15A R.IN （BK） （RD） TO INDOOR UNIT 250V 20A NOISE （WH） POWER WIRES FILTER 3～ S.IN （BK） （WH） SIGNAL WIRE F3 250V 1A POWER SOURCE （Y／G） ～220／230／240V 50Hz （RD） CIRCUIT CNFAN （Y／G）...
  • Page 13 TERMINAL PWB ASSY （MAIN） PWB ASSY （SUB） BLOCK POWER TRANSISTOR FUSE （BK） TO INDOOR UNIT （RD） 250V 20A （BK） ACTIVE 250V 20A 250V 20A （WH） （WH） POWER WIRES FILTER （WH） 3～ UNIT SIGNAL WIRE （BK） （Y／G） （WH） （Y／G） POWER SOURCE （BK）...

  • Page 14: Noise Level

    '10 • SRK-T-100 4. NOISE LEVEL Model SRK25ZJP-S Condition ISO-T1,JIS C9612 (Indoor Unit) Model SRK25ZJP-S Noise Cooling 36 dB(A) Level Heating 35 dB(A) × ..Cooling, Heating 1000 2000 4000 8000 Mid Octave Band frequency (Hz) (Outdoor Unit) Model SRC25ZJP-S...
  • Page 15 '10 • SRK-T-100 Model SRK35ZJP-S Condition ISO-T1,JIS C9612 (Indoor Unit) Model SRK35ZJP-S Cooling 39 dB(A) Noise Level Heating 41 dB(A) × ..Cooling, Heating 1000 2000 4000 8000 Mid Octave Band frequency (Hz) (Outdoor Unit) Model SRC35ZJP-S Cooling 49 dB(A) Noise Level Heating...
  • Page 16 '10 • SRK-T-100 Model SRK50ZJP-S Condition ISO-T1,JIS C9612 (Indoor Unit) Model SRK50ZJP-S Cooling 47 dB(A) Noise Level Heating 47 dB(A) × ..Cooling, Heating 1000 2000 4000 8000 Mid Octave Band frequency (Hz) (Outdoor Unit) Model SRC50ZJP-S Cooling 51 dB(A) Noise Level Heating...

  • Page 17: Piping System

    '09•SRK-DB-087D '10 • SRK-T-100 5 PIPING SYSTEM 5. PIPING SYSTEM Model SRK25ZJP-S Models SRK20ZJ-S, 25ZJ-S Model SRK35ZJ-S Model SRK35ZJP-S Humidity sensor (HD)
  • Page 18 '10 • SRK-T-100 Model SRK50ZJP-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 (TH3) (φ12.7) Room temp. exchanger sensor sensor (Th1) (Th2) Muffler 4way valve...

  • Page 19: Range Of Usage & Limitations

    '10 • SRK-T-100 6. RANGE OF USAGE & LIMITATIONS Net capacity = Capacity shown on specification Correction factors as follows. (1) Coefficient of cooling and heating capacity in relation to temperatures Cooling Heating Applicable range Depends on installed situation Indoor air W.B. temperature °C W.B. ISO-T1 Standard Condition ISO-T1 Standard Condition Outdoor air W.B.
  • Page 20 '10 • SRK-T-100 (2) Correction of cooling and heating capacity in relation to one way length of refrigerant piping Piping length [m] Cooling 0.99 0.975 0.965 0.95 0.935 Heating (3) Correction relative to frosting on outdoor heat exchanger during heating Air inlet temperature of 5 or more outdoor unit in °C WB...

  • Page 21: Capacity Tables

    '10 • SRK-T-100 7. CAPACITY TABLES Model SRK25ZJP-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 Air flow Outdoor air temp. Air flow air temp. 14˚CWB 16˚CWB 18˚CWB 19˚CWB 20˚CWB 22˚CWB...

  • Page 22: Application Data

    8. APPLICATION DATA RKX012A314 SELE INSTALLATION MANUAL WALL TYPE AIR CONDITIONER (Install at loc R410A REFRIGERANT USED Indoor un • 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. Where the A solid pla SAFETY PRECAUTIONS...
  • Page 23 • Ensure that no air enters in the refrigerant circuit when the unit is installed • Do not bundling, winding or processing for the power cord. Or, do not injury due to entrapment, burn or electric shocks. and removed. deforming the power plug due to tread it. •...

  • Page 24: Selection Of Installation Location

    012A314 SELECTION OF INSTALLATION LOCATION NDITIONER (Install at location that meets the following conditions, after getting approval from the customer) NT USED Indoor unit 6.5 cm minimum from the ceiling Where there is no obstructions to the air flow and where the cooled and heated air can be evenly distributed. Installation board A solid place where the unit or the wall will not vibrate.

  • Page 25: Earthing Work

    use fire or burst. Model 09, 25 Model 12, 35 Model 18, 50 Outlet Open Open Total one way length MAX. 15m MAX. 15m MAX. 25m Vertical height difference MAX. 10m MAX. 10m MAX. 15m Less than 10m : Not required Less than 15m : Not required Additional refrigerant Not required...

  • Page 26: Installation Of Indoor Unit

    INSTALLATION OF INDOOR UNIT INSTA Fixing of Installation of Installation board Make sure Relation between setting plate and indoor unit Fixing of installation board stable base Adjustment of the installation board in the horizontal When insta INSTALLATION SPACE (INDOOR UNIT) Look for the inside wall structures (Intermediate support or (FRONT VIEW) direction is to be conducted with four screws in a...
  • Page 27 Conne and outdoor connections. Polychloroprene rubber conductors insulation Stranded core Fix the connecting wire by wiring clamp. 4or5 Number of conductors Attach the lid (R). Indoor One conductor of the cable is the earth conductor Lid (R) (yellow/green) Section of copper wire (mm Matters of special notice when piping from left or central/rear of the unit.

  • Page 28: Installation Of The Outdoor Unit

    INSTALLATION OF THE OUTDOOR UNIT Fixing of outdoor Electric wiring work Make sure that the unit is stable in installation. Fix the unit to Perform wiring, making wire terminal numbers conform to or unit stable base. terminal numbers of indoor unit terminal block. When installing the unit at a higher place or where it could be Connect using ground screw located near mark.

  • Page 29: Air Purge

    Flaring work Measurement B (mm) Use a flare tool designed for R410A or a conventional flare tool. Measurement B Clamp Copper pipe diameter Conventional (R22) flare tool Please note that measurement B (protrusion from the flaring Clutch type flare tool for R410A Clutch type Wing nut type...

  • Page 30: Outline Of Operation Control By Microcomputer

    '10 • SRK-T-100 9. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Operation control function by remote controller Remote controller S 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.

  • Page 31: Unit On/Off Button

    '10 • SRK-T-100 (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. (a) Operation Push the button once to place the unit in the automatic mode. Push it once more to turn the unit off. (b) Details of operation The unit will go into the automatic mode in which it automatically determines, from room temperature (as detected by sensor), whether to go into the cooling, thermal dry or heating modes.

  • Page 32: Flap Control

    '10 • SRK-T-100 (5) Flap control   Control the flap by AIRFLOW (UP/DOWN) button on the wireless remote controller. (a) Flap   Each time when you press the AIRFLOW (UP/DOWN) button the mode changes as follows. (Flap stopped) (Swing) Angle of flap from horizontal Remote controller...

  • Page 33: Outline Of Heating Operation

    Deviation between the room temperature setting correction temperature and the suction air temperature is calculated in accordance with the fuzzy rule, and used for control of the air capacity and the compressor command speed. Model SRK25ZJP-S SRK35ZJP-S SRK50ZJP-S Fan speed...

  • Page 34: Outline Of Cooling Operation

    (b) Detail of control in each mode (Pattern) Fuzzy operation During the fuzzy operation, the air flow and the compressor command speed are controlled by calculating the difference between the room temperature setting correction temperature and the suction air temperature. Model SRK25ZJP-S SRK35ZJP-S SRK50ZJP-S Fan speed Auto...

  • Page 35: Protective Control Function

    '10 • SRK-T-100 (10) Protective control function (a) Frost prevention for indoor heat exchanger (During cooling or dehumidifying) Operating conditions Indoor heat exchanger temperature (Th2) is lower than 5ºC. 8 minutes after reaching the compressor command speed except 0 rps. Compressor command Detail of anti-frost operation...
  • Page 36 '10 • SRK-T-100 Model 50 RPSmin < 40 40 < = RPSmin < 80 80 < = RPSmin < 90 53~44 58~48 59~50 62~58 90 < = RPSmin < 102 44~33.5 48~38.5 50~39.5 58~54 102 < = RPSmin 33.5 38.5 39.5 Notes (1) RPSmin: The lower one between the compressor command speed (d) Heating overload protective control...
  • Page 37 '10 • SRK-T-100 (ii) Protective control II Operating conditions: When the outdoor air temperature sensor (TH2) is 0ºC or lower continuously for 30 seconds while the compressor command speed is other than 0 rps. The outdoor fan motor speed is stepped up by 2 speed step. (Upper limit 7th speed) Detail of operation: When the either of the following condition is satisfied.
  • Page 38 '10 • SRK-T-100 Outdoor unit failure This is a function for determining when there is trouble with the outdoor unit during air conditioning. The compressor is stopped if any one of the following in item 1), 2) is satisfied. Once the unit is stopped by this function, it is not restarted.

  • Page 39: Maintenance Data

    '10 • SRK-T-100 10. MAINTENANCE DATA (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 1 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 discharg- ing this electrical charge (to DC 10 V or lower).

  • Page 40: Troubleshooting Procedure (If The Air Conditioner Runs)

    '10 • SRK-T-100 (4) Troubleshooting procedure (If the air conditioner runs) Confirm 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.

  • Page 41: Self-Diagnosis Table

    '10 • SRK-T-100 (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 3 minutes or more after the emergency stop, the trouble display stops and the air conditioner resumes operation.

  • Page 42: Service Mode (Trouble Mode Access Function)

    '10 • SRK-T-100 (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 43: Remote Controller Setting

    '10 • SRK-T-100 *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 1.5 second (start signal) is not counted in the number of flashes.) •...
  • Page 44 '10 • SRK-T-100 ② Stop data Remote controller setting Displayed data Operation Fan speed Temperature switching switching setting 21ºC Displays the reason for the stop (stop code) the previous time when the air conditioner was stopped by protective stop control. 22ºC Displays the reason for the stop (stop code) 2 times previous when the air conditioner was stopped by protective stop control.
  • Page 45 '10 • SRK-T-100 Number of flashes when in service mode Stop code Error content Auto Error Occurrence conditions Cause TIMER recovery display light light Error code Minor category Major category (10’s digit) (1’s digit) Overcharge Cooling overload 1 When there is a current safe stop in overload 1 mode 1 time Compressor lock (outdoor temperature:...
  • Page 46 '10 • SRK-T-100 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 first (starting signal). (See the example shown below.) • In the case of current safe (heating CT1) (example: stop code “32”) The RUN light (10’s digit) flashes 3 times and the TIMER light (1’s digit) flashes 2 times.
  • Page 47 '10 • SRK-T-100 (e) Room temperature sensor temperature, indoor heat exchanger sensor temperature, outdoor air tempera- ture sensor temperature, outdoor heat exchanger sensor temperature table Units: ºC 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.
  • Page 48 '10 • SRK-T-100 Discharge pipe temperature table Units: ºC TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) * If no data is recorded (error code is normal), the display for sensor becomes as shown below. Sensor value displayed when the error code is normal Sensor name -64ºC...
  • Page 49 '10 • SRK-T-100 Service data record form Model Customer Date of investigation Machine name Content of complaint Display results Remote controller settings 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 50: Inspection Procedures Corresponding To Detail Of Trouble

    '10 • SRK-T-100 (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 ◆ Discharge pipe sensor temperature characteristics (Room temp., indoor heat exchanger temp., outdoor heat exchanger temp., outdoor air temp.)

  • Page 51: Current Cut

    '10 • SRK-T-100 Current cut [Open phase on compressor output terminal, compressor lock] Does current cut operate when Defective outdoor PCB operating inverter with compressor wire disconnected? Is output voltage applied to all 3 Defective outdoor PCB phases of power transistor? Secure space for suction Is there any shortcircuit? and blow out.

  • Page 52: Over Heat Of Compressor

    '10 • SRK-T-100 [Gas shortage, defective discharge Over heat of compressor pipe sensor] Is discharge pipe sensor Connector connection check, resistance resistance value good? value check, replacement of discharge pipe (page 49) sensor Check if there are any Does trouble persist after Is sufficient quantity of refrigerant places where gas is leaking.

  • Page 53: Outdoor Fan Motor Error

    '10 • SRK-T-100 [Defective fan motor, connector Outdoor fan motor error poor connection, defective PCB] Is connector connection good? Correct connector connection Is DC fan motor resistance value good? * Disconnect the fan motor connector, then investigate the DC fan motor and out- door PCB separately.
  • Page 54 '10 • SRK-T-100 (8) Phenomenon observed after shortcircuit, wire breakage on sensor (a) Indoor unit Phenomenon Operation Sensor mode Shortcircuit Broken wire Release of continuous compressor operation command Cooling Continuous compressor operation command is not released. Room temperature sensor Continuous compressor operation command is not released. Heating Release of continuous compressor operation command Continuous compressor operation command is not released.
  • Page 55 '10 • SRK-T-100 (b) Indoor unit fan motor check procedure This is a diagnostic procedure for determining if the indoor unit fan motor or the indoor PCB is broken down. 1) Indoor PCB output check a) Turn off the power. b) Remove the front panel, then disconnect the fan motor lead wire connector.
  • Page 56 ◆ Check point of outdoor unit 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 Mark Color Remove the fasten terminal and test output voltage Black Orange...
  • Page 57 ◆ Check point of outdoor unit 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 Mark Color Black ◆Inspection power transistor Remove the fasten terminal and test output voltage Orange White...
  • Page 58 '10 • SRK-T-100 (a) Inspection of electronic expansion valve Electronic expansion valve operates for approx. 10 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.) If it is heard the sound of operating electronic expansion valve, it is almost normal.
  • Page 59 INVERTER WALL MOUNTED TYPE RESIDENTIAL 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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