Mitsubishi Heavy Industries SRK20ZMA-S Technical Manual & Parts List
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Mitsubishi Heavy Industries SRK20ZMA-S Technical Manual & Parts List

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Manual No.'14 • SRK-T-154
RESIDENTIAL AIR-CONDITIONING
TECHNICAL MANUAL & PARTS LIST
WALL MOUNTED TYPE
RESIDENTIAL AIR-CONDITIONERS
(Split system, air to air heat pump type)
SRK20ZMA-S
SRK25ZMA-S
SRK35ZMA-S
SRK50ZMA-S

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Summary of Contents for Mitsubishi Heavy Industries SRK20ZMA-S

  • Page 1 Manual No.'14 • SRK-T-154 RESIDENTIAL AIR-CONDITIONING TECHNICAL MANUAL & PARTS LIST WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS (Split system, air to air heat pump type) SRK20ZMA-S SRK25ZMA-S SRK35ZMA-S SRK50ZMA-S...
  • Page 3 '14 • SRK-T-154 TECHNICAL MANUAL...

  • Page 4: Table Of Contents

    '14 • SRK-T-154 CONTENTS 1. SPECIFICATIONS ..................2. EXTERIOR DIMENSIONS ................. (1) Indoor units ..................(2) Outdoor units .................................... 12 3. ELECTRICAL WIRING ................14 (1) Indoor units ..................14 (2) Outdoor units 4. NOISE LEVEL .................... 17 5. PIPING SYSTEM ..................
  • Page 5 '14 • SRK-T-154 10. MAINTENANCE DATA ................56 (1) Cautions ..................... 56 (2) Items to check before troubleshooting ..........56 (3) Troubleshooting procedure (If the air conditioner does not run at all) ..56 ..... 57 (4) Troubleshooting procedure (If the air conditioner runs) (5) Self-diagnosis table ................

  • Page 6: Specifications

    '14 • SRK-T-154 1. SPECIFICATIONS SRK20ZMA-S Model Indoor unit SRK20ZMA-S Outdoor unit SRC20ZMA-S Item Power source 1 Phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 2.0 ( 1.0 (Min.) - 2.7 (Max.)) Nominal heating capacity (range) 2.7 ( 1.2 (Min.) - 3.9 (Max.)) Cooling 0.44 ( 0.21 - 0.77 )
  • Page 7 '14 • SRK-T-154 SRK25ZMA-S Model Indoor unit SRK25ZMA-S Outdoor unit SRC25ZMA-S Item Power source 1 Phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 2.5 ( 1.0 (Min.) - 2.9 (Max.)) Nominal heating capacity (range) 3.2 ( 1.2 (Min.) - 4.6 (Max.)) Cooling 0.575 ( 0.21 - 0.81 ) Power...
  • Page 8 '14 • SRK-T-154 SRK35ZMA-S Model Indoor unit SRK35ZMA-S Outdoor unit SRC35ZMA-S Item Power source 1 Phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 3.3 ( 1.0 (Min.) - 3.8 (Max.)) Nominal heating capacity (range) 4.0 ( 1.3 (Min.) - 4.8 (Max.)) Cooling 0.87 ( 0.21 - 1.20 ) Power...
  • Page 9 '14 • SRK-T-154 SRK50ZMA-S Model Indoor unit SRK50ZMA-S Outdoor unit SRC50ZMA-S Item Power source 1 Phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 5.0 ( 1.6 (Min.) - 5.5 (Max.)) Nominal heating capacity (range) 5.8 ( 1.6 (Min.) - 6.6 (Max.)) Cooling 1.55 ( 0.40 - 2.20 ) Power...

  • Page 10: Exterior Dimensions

    '14 • SRK-T-154 2. EXTERIOR DIMENSIONS (1) Indoor units Models SRK20ZMA-S, 25ZMA-S, 35ZMA-S, 50ZMA-S RLA000Z053...

  • Page 11: Outdoor Units

    '14 • SRK-T-154 (2) Outdoor units Models SRC20ZMA-S RCV000Z017...
  • Page 12 '14 • SRK-T-154 Models SRC25ZMA-S, 35ZMA-S RCV000Z018...
  • Page 13 '14 • SRK-T-154 Models SRC50ZMA-S RCT000Z007...
  • Page 14 '14 • SRK-T-154 (3) Remote control (a) Wireless remote control Unit : mm...
  • Page 15 '14 • SRK-T-154 (b) Wired remote control (option parts) Interface kit (SC-BIKN-E) is required to use the wired remote control. Wiring outlet Cut off the upper thin part of remote control lower case with a nipper or knife, and grind burrs with a file etc. Exposed mounting In case of pulling out In case of pulling out...

  • Page 16: Electrical Wiring

    '14 • SRK-T-154 3. ELECTRICAL WIRING (1) Indoor units Models SRK20ZMA-S, 25ZMA-S, 35ZMA-S, 50ZMA-S RWA000Z255...
  • Page 17 '14 • SRK-T-154 (2) Outdoor units Models SRC20ZMA-S, 25ZMA-S, 35ZMA-S t゜ t゜ t゜ RWC000Z271...
  • Page 18 '14 • SRK-T-154 Models SRC50ZMA-S t゜ t゜ t゜ RWC000Z267...

  • Page 19: Noise Level

    '14 • SRK-T-154 '09•SRK-DB-087D 4. NOISE LEVEL 4 NOISE LEVEL Model SRK20ZMA-S Condition ISO-T1, JIS C 9612 Model SRK20ZJ-S Mike position (Indoor Unit) Model SRK20ZMA-S 0.8m Cooling 33 dB(A) Noise Unit Mike position Level Heating 36 dB(A) (Center & Low points) ×...
  • Page 20 '09•SRK-DB-087D '14 • SRK-T-154 Model SRK25ZMA-S Model SRK25ZJ-S Condition ISO-T1, JIS C 9612 (Indoor Unit) Mike position Model SRK25ZMA-S Cooling 34 dB(A) Noise 0.8m Unit Level Heating 39 dB(A) Mike position (Center & Low points) × ..Cooling  Heating Mike position: at highest noise level in position as mentioned below Distance from front side 1m Mike position 0.8m...
  • Page 21 '09•SRK-DB-087D '14 • SRK-T-154 Model SRK35ZMA-S Model SRK35ZJ-S Condition ISO-T1, JIS C 9612 (Indoor Unit) Mike position Model SRK35ZMA-S Cooling 45 dB(A) Noise 0.8m Unit Level Heating 42 dB(A) Mike position (Center & Low points) × ..Cooling  Heating Mike position: at highest noise level in position as mentioned below Distance from front side 1m Mike position 0.8m...
  • Page 22 '14 • SRK-T-154 Model SRK50ZMA-S Condition ISO-T1,JIS C 9612 (Indoor Unit) Mike position Model SRK50ZMA-S Cooling 46 dB(A) Noise 0.8m Unit Level Heating 45 dB(A) Mike position (Center & Low points) × ..Cooling Heating Mike position: at highest noise level in position as mentioned below Distance from front side 1m Mike position 0.8m...

  • Page 23: Piping System

    '09•SRK-DB-087D '14 • SRK-T-154 5. PIPING SYSTEM 5 PIPING SYSTEM Models SRK20ZMA-S, 25ZMA-S pipe Model SRK35ZMA-S pipe Humidity sensor (HD)
  • Page 24 '14 • SRK-T-154 Model SRK50ZMA-S Model SRK50ZM-S Cooling cycle Heating cycle Indoor unit Outdoor unit Outdoor air Flare temp. sensor connection Service valve (TH2) (Gas) Discharge pipe temp. sensor Gas pipe Check joint Heat (φ12.7) (TH3) Room temp. Muffler exchanger sensor sensor (Th1)

  • Page 25: Range Of Usage & Limitations

    '14 • SRK-T-154 6. RANGE OF USAGE & LIMITATIONS RANGE OF USAGE & LIMITATIONS Models SRK20,25,35ZMA-S SRK50ZMA-S Item Cooling operation : Approximately 18 to 32℃ D.B. Indoor return air temperature Heating operation : Approximately 10 to 30℃ D.B. (Upper, lower limits) (Refer to the selection chart) Cooling operation : Approximately -15 to 46℃...
  • Page 26 '09•SRK-DB-087D '14 • SRK-T-154 (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 27: Capacity Tables

    '14 • SRK-T-154 7. CAPACITY TABLES Model SRK20ZMA-S Cooling Mode (kW) Heating Mode (HC) (kW) Indoor air temp Indoor air temp outdoor Air flow 21˚CDB 23˚CDB 26˚CDB 27˚CDB 28˚CDB 31˚CDB 33˚CDB Outdoor air temp. Air flow air temp. 14˚CWB 16˚CWB 18˚CWB...
  • Page 28 '14 • SRK-T-154 Model SRK50ZMA-S Cooling Mode (kW) Heating Mode (HC) (kW) Indoor air temp indoor air temp outdoor Air flow 21˚CDB 23˚CDB 26˚CDB 27˚CDB 28˚CDB 31˚CDB 33˚CDB Outdoor air temp. Air flow air temp. 16˚CDB 18˚CDB 20˚CDB 22˚CDB 24˚CDB 14˚CWB 16˚CWB 18˚CWB...

  • Page 29: Application Data

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  • Page 41: Outline Of Operation Control By Microcomputer

    '14 • SRK-T-154 9. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Operation control function by wireless remote control Operation section Transmission section OPERATION MODE select button ON/OFF (luminous) button Each time the button is pressed, the mode changes. Press to start operation, press again to stop.

  • Page 42: Setting The Remote Control

    '09•SRK-DB-087D '14 • SRK-T-154 '09•SRK-DB-087D (2) Unit ON/OFF button (2) Unit ON/OFF button wireless wireless (a) Operation (a) Operation (b) Details of operation (b) Details of operation Function Indoor temperature Fan speed Flap/Louver Timer Switch Function Indoor temperature setting Operation mode Fan speed Flap/Louver Timer Switch setting Operation mode...
  • Page 43 '14 • SRK-T-154 (5) Selection of the annual cooling function Jumper wire (JA3) (a) The annual cooling function can be enabled or disabled by means of the jumper wire (JA3) on the indoor unit PCB and the dip switch (SW2-4) on the interface kit (option) PCB. Interface kit Jumper wire (SC-BIKN-E)
  • Page 44 '09•SRK-DB-087D '14 • SRK-T-154 (8) Flap and louver control (a) Flap (Flap stopped) (Swing) Angle of Flap from Horizontal Remote control display Approx. 10° Approx. 25° Approx. 40° Approx. 50° Approx. 60° COOL , DRY, FAN Approx. 25° Approx. 40° Approx.
  • Page 45 '09•SRK-DB-087D '14 • SRK-T-154 (9) 3D auto operation Air flow selection Operation mode AUTO < = Indoor temp. – Setting temp. >5°C Indoor temp. – Setting temp. 5°C Cooling HIGH POWER AUTO < = Setting temp. – Indoor temp. >5°C Setting temp.
  • Page 46 As “Silent mode start” signal is received from the wireless remote control, it operates by dropping the outdoor fan tap and the (a) Setting compressor command speed. (a) Comfortable timer setting (ON timer) If the air conditioning unit is running, press the ON/OFF button to stop. SRK20ZMA-S SRK25ZMA-S SRK35ZMA-S SRK50ZMA-S Cooling Heating Cooling Heating Cooling Heating Cooling Heating...
  • Page 47 ON(HOT KEEP) Indoor fan motor Outdoor fan motor (few minutes ON) 4-way valve (3 minutes ON) (b) Details of control at each operation mode (pattern) (i) Fuzzy operation Model SRK20ZMA-S SRK25ZMA-S SRK35ZMA-S SRK50ZMA-S Fan speed 30~115rps 30~115rps 30~115rps 23~106rps Auto...
  • Page 48 (b) Details of control at each operation mode (pattern) (model SRK50 : 35) (i) Fuzzy operation (model SRK50 : 35) '14 • SRK-T-154 Model SRK20ZJ-S SRK25ZJ-S SRK35ZJ-S SRK50ZJ-S − Fan speed 30~115rps 30~115rps 30~115rps 23~106rps Auto 30~115rps 30~115rps 30~115rps 23~106rps (model 50 : ≧...
  • Page 49 Compressor Indoor fan motor '14 • SRK-T-154 Outdoor fan motor (few minutes ON) (few minutes ON) 4-way valve (b) Detail of control in each mode (Pattern) Fuzzy operation Model SRK20ZMA-S SRK25ZMA-S SRK35ZMA-S SRK50ZMA-S Fan speed 20~66rps 20~74rps 20~98rps 23~96rps Auto...
  • Page 50 Dehumidifying Indoor air temperature (˚C) 18.0 Heating '14 • SRK-T-154 Outdoor air temperature (˚C) (i)   (ii) When both the indoor and the outdoor air temperatures are in the range “A”, cooling or heating is switched depending on the difference between the setting temperature and the indoor air temperature. When the operation mode has been judged following the change of setting temperature with the remote control, the hourly j- (iii) udgment of operation mode is cancelled.
  • Page 51 '09•SRK-DB-087D '14 • SRK-T-154 (b) Frost prevention control Operating conditions compressor command speed (ii) Detail of anti-frost operation Lower Indoor heat exchanger limit temperature 5°C or lower 2.5°C or lower speed Item (model SRK50 : 23 rps) Lower limit of compressor command speed 0 rps Indoor fan Indoor heat exchanger...
  • Page 52 '09•SRK-DB-087D '14 • SRK-T-154 (e) Cooling low outdoor air temperature protective control Operating conditions: (ii) Detail of operation: than 50 <44> (30) rps, the speed is kept to 50 <44> (30) rps. However, when the thermo OFF, the speed is A or B C or D Upper limit 50 rps...
  • Page 53 '09•SRK-DB-087D '14 • SRK-T-154 Model SRK50 RPSmin < 40 40 < = RPSmin < 80 80 < = RPSmin < 90 53 ~ 47 57 ~ 51 59 ~ 53 90 < = RPSmin < 102 47 ~ 41 51 ~ 45 53 ~ 47 102 <...
  • Page 54 The lower limit of compressor command speed is set to 30 rps and even if the calculated result becomes lower than that after fuzzy calculation, the speed is kept to 30 rps. However, when the thermo OFF, the speed is reduced to 0 prs.
  • Page 55 (iii) Reset conditions: When either of the following condition is satisfied. '14 • SRK-T-154 The outdoor air temperature (TH2) becomes 6ºC ~ 11ºC. The compressor command speed is 0 rps. Compressor overheat protection Purpose: (ii) Detail of operation (Example) Fuzzy Discharge pipe temperature (˚C) Item Cooling...
  • Page 56 '09•SRK-DB-087D '14 • SRK-T-154 Serial signal transmission error protection Purpose: (ii) Detail of operation: Rotor lock Outdoor fan motor protection Outdoor fan control at low outdoor temperature Cooling Operating conditions: Detail of operation: Outdoor fan Outdoor temperature > 10˚C Outdoor temperature < = 10˚C Reset conditions: (ii) Heating...
  • Page 57 Detail of operation: Reset conditions: '14 • SRK-T-154 Refrigeration cycle system protection Starting conditions When 5 minutes have elapsed after the compressor ON or the completion of the defrost control Other than the defrost control When, after meeting the conditions of 1) and 2) above, the compressor speed, indoor temperature (Thi) and indoor heat exchanger temperature (Th2) have met the conditions in the following table for 5 minutes: Indoor temperature (Th1)/ Operation mode...

  • Page 58: Maintenance Data

    '09•SRK-DB-087D '14 • SRK-T-154 Reference Reference 10. MAINTENANCE DATA 2 TROUBLESHOOTING PROCEDURES FOR ELECTRICAL EQUIPMENT (1) Cautions (2) Items to check before troubleshooting (3) Troubleshooting procedure (If the air conditioner does not run at all) Important wireless proced-...

  • Page 59: Troubleshooting Procedure (If The Air Conditioner Runs)

    '09•SRK-DB-087D '14 • SRK-T-154 (4) Troubleshooting procedure (If the air conditioner runs) 59 ~ 65. 59 ~ 65.

  • Page 60: Self-Diagnosis Table

    '14 • SRK-T-154 (5) Self-diagnosis table Wired Outdoor Indoor unit display panel remote Description control PCB Cause Display (flashing) condition control TIMER of trouble Red LED display light light • Broken heat exchanger sensor When a heat exchanger sensor 1 wire disconnection is detected while 1-time operation is stopped.

  • Page 61: Service Mode (Trouble Mode Access Function)

    '09•SRK-DB-087D '14 • SRK-T-154 (6) Service mode (Trouble mode access function) (a) Explanation of terms Explanation Term The service mode is the mode where service data are displayed by flashing of the display lights Service mode when the operations in item (b) below are performed with the indoor control. These are the contents of error displays and protective stops which occurred in the past in the air conditioner system.
  • Page 62 '09•SRK-DB-087D '14 • SRK-T-154 4-time flash 2-time flash. wireless mode mode Self-diagnosis data wireless mode mode Wireless remote control setting Contents of output data Operation mode Fan speed mode wireless Indicates the number of Wireless remote control setting occasions previous to the present Temperature setting the error display data are from.
  • Page 63 '09•SRK-DB-087D '14 • SRK-T-154 (Example) Wireless remote control setting Operation Displayed data Fan speed Temperature mode mode setting Displays the reason for the stop (error code) the previous time an error was displayed. 21ºC Displays the reason for the stop (error code) 2 times previous when an error was displayed. 22ºC Cooling 23ºC...
  • Page 64 '09•SRK-DB-087D '14 • SRK-T-154 (c) Error code, stop code table Number of flashes when in service mode Stop coad Error Auto TIMER Error content Cause Occurrence conditions display recovery light Error coad light (10's digit) (1's digit) Normal Can not receive signals for 35 Power supply is faulty.
  • Page 65 '09•SRK-DB-087D '14 • SRK-T-154 4-time flash 2-time flash. (d) Operation mode, Fan speed mode information tables (ii) mode mode Display pattern when Display pattern when Fan speed in service mode in service mode Operation mode mode when when there is an there is an RUN light TIMER light...
  • Page 66 '09•SRK-DB-087D '14 • SRK-T-154 (e) Temperatare information Room temperature sensor, indoor heat exchanger sensor, outdoor air temperature sensor, outdoor heat exchanger sensor temperature Units: °C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) temperature information Sensor value displayed when the error code is normal Sensor name...
  • Page 67 '09•SRK-DB-087D '14 • SRK-T-154 (ii) Discharge pipe sensor temperature Unit: °C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) temperature information Sensor value displayed when the error code is normal -64ºC data 0.1 sec.
  • Page 68 '09•SRK-DB-087D '14 • SRK-T-154 Service data record form Wireless r Operation mode Fan speed mode Wireless r Wireless r Wireless r Wireless r Wireless r wireless...

  • Page 69: Inspection Procedures Corresponding To Detail Of Trouble

    '09•SRK-DB-087D '14 • SRK-T-154 (7) Inspection procedures corresponding to detail of trouble Sensor error Broken sensor wire, connector poor connection Sensor temperature characteristics (Room Discharge pipe sensor temperature characteristics temp., indoor heat exchanger temp., out- door heat exchanger temp., outdoor air temp.) - 10 Temperature (˚C)
  • Page 70 '09•SRK-DB-087D '14 • SRK-T-154 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. ＊   ＊ SRC20-35:1.703Ω (U-V, V-W, U-W ) or more at 20ºC SRC50:1.417Ω...
  • Page 71 '09•SRK-DB-087D '14 • SRK-T-154 Over heat of compressor Gas shortage, defective discharge pipe sensor Error of signal transmission Wiring error including power cable, defective indoor/ outdoor PCB ② ③ ② ③ ① ②...
  • Page 72 '09•SRK-DB-087D '14 • SRK-T-154 Trouble of outdoor unit Insufficient refregerant amount, Faulty power transistor, Broken compressor wire Service valve close, Defective EEV, Defective outdoor PCB ◆       Notes (1) (2) Check coil wire resistance, see page 68. wire ．...

  • Page 73: 8) Phenomenon Observed After Shortcircuit, Wire Breakage On Sensor

    '14 • SRK-T-154 Rotor lock Defective compressor, defective outdoor PCB See page 68. Service valve (gas side) closed, Service valve (gas side) closed operation (8) Phenomenon observed after shortcircuit, wire breakage on sensor Defective outdoor PCB (a) Indoor unit Phenomenon Operation Sensor mode...

  • Page 74: Phenomenon Observed After Shortcircuit, Wire Breakage On Sensor

    '14 • SRK-T-154 (8) Phenomenon observed after shortcircuit, wire breakage on sensor (a) Indoor unit Phenomenon Operation Sensor mode Shortcircuit Disconnected wire Cooling Room temperature sensor Heating Freezing cycle system protection trips and stops the compressor. Cooling Heat exchanger sensor Heating Cooling Humidity sensor...
  • Page 75 Replace indoor PCB. blocks ② and ③ oscillating between DC 0 and 20V? '14 • SRK-T-154 Indoor electrical components are normal. (b) Indoor unit fan motor check procedure 1) Indoor PCB output check ① ④ ⑤ DC several V (–) DC 308~336V (4~6 V) Measuring...

  • Page 76: How To Make Sure Of Wireless Remote Control

    Operation SW ON Measure in this section '14 • SRK-T-154 (10) How to make sure of wireless remote control wireless wireless wireless wireless wireless wireless Simplified check methd of wireless remote control   It is normal if the signal transmission section of the wireless remote control emits a whitish light at each transmission on the monitor of digital camera.

  • Page 77: Outdoor Unit Inspection Points

    '14 • SRK-T-154 (12) Outdoor unit inspection points Models SRC20ZMA-S, 25ZMA-S, 35ZMA-S ◆Check point of outdoor unit CAUTION- HIGH VOLTAGE ◆Power source and serial signal inspection High voltage is produced in the control box. Don't touch electrical parts in the control box for 5 minutes after the : AC 220/230/240V unit is stopped.
  • Page 78 '14 • SRK-T-154 Model SRC50ZMA-S ◆Check point of outdoor unit CAUTION- HIGH VOLTAGE ◆Power source and serial signal inspection High voltage is produced in the control box. Don't touch : AC 220/230/240V electrical parts in the control box for 5 minutes after the : AC 220/230/240V unit is stopped.
  • Page 79 '09•SRK-DB-087D '14 • SRK-T-154 (a) Inspection of electronic expansion valve (ii) (iii) (iv) • Inspection of electronic expansion valve as a separate unit Measuring point Resistance when normal (b) Outdoor unit fan motor check procedure          ② Measuring Voltage range when point normal...

  • Page 80: Option Parts

    '14 • SRK-T-154 11. OPTION PARTS Installation manual for wired remote controller PJA012D730 Connect the remote control cord (1) Wired remote control (RC-E5) terminal block. Connect the terminal of remote c Read together with indoor unit's installation manual. with the terminal of indoor unit (X (X and Y are no polarity) WARNING Wiring route is as shown in the r...
  • Page 81 '14 • SRK-T-154 mote controller Connect the remote control cord to the Sheath Sheath The range of temperature setting Upper Upper terminal block. When shipped, the range of set tempera Connect the terminal of remote control (X,Y) Upper case Upper case Board Board Heating : 16 - 30°C (55 - 86°F)
  • Page 82 '14 • SRK-T-154 PJA0 12 D73 0 Sheath Sheath The range of temperature setting Upper When shipped, the range of set temperature differs depending on the operation mode as below. Upper case Upper case Board Heating : 16 - 30°C (55 - 86°F) Except heating (cooling, fan, dry, automatic) : 18 - 30°C (62 - 86°F) Upper limit and lower limit of set temperature can be changed with remote control.
  • Page 83 '14 • SRK-T-154 The functional setting The initial function setting for typical using is performed automatically by the indoor unit connected, when remote control and indoor unit are connected. As long as they are used in a typical manner, there wiil be no need to change the initial settings. If you would like to change the initial setting marked “...
  • Page 84 '14 • SRK-T-154 Note 1: The initial setting marked “ ” is decided by connected indoor and outdoor unit, and is automatically defined as following table. Function No. Item Default Model "Auto-RUN" mode selectable indoor unit. Remote control function02 Indoor unit without "Auto-RUN" mode Indoor unit with two or three step of air flow setting Remote control function06...
  • Page 85 '14 • SRK-T-154 PJ A012D730 is automatically defined as following table. Operation message How to set function able indoor unit. Function description: Function No. Stop air-conditioner and press (SET) (MODE) setting description: -RUN" mode buttons at the same time for over three seconds, and the ree step of air flow setting "FUNCTION SET "...

  • Page 86: Interface Kit (Sc-Bikn-E)

    '14 • SRK-T-154 (2) Interface kit (SC-BIKN-E) RKZ012A088B Accessories included in package Safety precautions Before use, please read these Safety Precautions thoroughly before installation. Be sure to check all the accessories included in package. ●All the cautionary items mentioned below are important safety related items to be taken into consideration, so be sure to observe them at all times.
  • Page 87 '14 • SRK-T-154 Installation of the interface ・Install the interface within the range of the connection cable length from the indoor unit. (approximately 1.8m) Wiring inlet ・Be sure not to extend the connection cable on site. If the connection cable is extended, malfunction may occur. ・Fix the interface on the wall, pillar or the like.
  • Page 88 '14 • SRK-T-154 Functions of CNT connector It is available to operate the air conditioning unit and to monitor the operation status with the external control unit (remote display) by sending the input/output signal through CNT connector on the indoor control PCB. 0.75mm Note (1) 0.3mm ×2m...
  • Page 89 '14 • SRK-T-154 Connection of wired remote control Regarding the connection of wired remote control, refer to the instruction manual of wired remote control. ①Switch ON the DIP switch SW2-2 (Factory setting : ON) on the interface PCB. DIP suitch Caution:Wireless remote control attached to the indoor unit can be used in parallel, after connecting the wired remote control.

  • Page 90: Super Link E Board (Sc-Adna-E)

    '14 • SRK-T-154 (3) Super link E board (SC-ADNA-E) WARNING CAUTION...
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  • Page 93: Parts List

    '14 • SRK-T-154 PARTS LIST TECHNICAL MANUAL INDOOR UNIT SRK20ZMA-S, SRK25ZMA-S, SRK35ZMA-S, SRK50ZMA-S OUTDOOR UNIT SRC20ZMA-S, SRC25ZMA-S, SRC35ZMA-S, SRC50ZMA-S...
  • Page 94 '14 • SRK-T-154 PANEL & FAN ASSY CRAE0221...
  • Page 95 '14 • SRK-T-154 SRK20ZMA-S END ITEM NO. : RWA002F073 Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 7 RLA 102A 002H PANEL ASSY,FRONT 1 RLA 122A 002 PANEL ASSY,FRONT 2 RLA 435A 006 PANEL ASSY,AIR IN 3 RLA 437A 001 FILTER,AIR W315.5×H330.7(t2)
  • Page 96 '14 • SRK-T-154 HEAT EXCH. & CONTROL CRAE0279...
  • Page 97 '14 • SRK-T-154 SRK20ZMA-S END ITEM NO. : RWA002F073 Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 8 RLA 301A 013 HEAT EXCH ASSY(AIR) 2 RLA 129A 004 BRACKET(L) 3 RLA 315D 004 HEADER ASSY 4 RLA 321A 058...
  • Page 98 '14 • SRK-T-154 PANEL & FAN ASSY CRAE0221...
  • Page 99 '14 • SRK-T-154 SRK25ZMA-S END ITEM NO. : RWA002F073A Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 7 RLA 102A 002H PANEL ASSY,FRONT 1 RLA 122A 002 PANEL ASSY,FRONT 2 RLA 435A 006 PANEL ASSY,AIR IN 3 RLA 437A 001 FILTER,AIR W315.5×H330.7(t2) 4 RLA 129A 017...
  • Page 100 '14 • SRK-T-154 HEAT EXCH. & CONTROL CRAE0279...
  • Page 101 '14 • SRK-T-154 SRK25ZMA-S END ITEM NO. : RWA002F073A Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 8 RLA 301A 013 HEAT EXCH ASSY(AIR) 2 RLA 129A 004 BRACKET(L) 3 RLA 315D 004 HEADER ASSY 4 RLA 321A 058 PIPE 5 7 RLA 321A 001 PIPE ASSY...
  • Page 102 '14 • SRK-T-154 PANEL & FAN ASSY CRAE0221...
  • Page 103 '14 • SRK-T-154 SRK35ZMA-S END ITEM NO. : RWA002F073B Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 7 RLA 102A 002H PANEL ASSY,FRONT 1 RLA 122A 002 PANEL ASSY,FRONT 2 RLA 435A 006 PANEL ASSY,AIR IN 3 RLA 437A 001 FILTER,AIR W315.5×H330.7(t2) 4 RLA 129A 017...
  • Page 104 '14 • SRK-T-154 HEAT EXCH. & CONTROL CRAE0281...
  • Page 105 '14 • SRK-T-154 SRK35ZMA-S END ITEM NO. : RWA002F073B Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 8 RLA 301A 013 HEAT EXCH ASSY(AIR) 2 RLA 129A 004 BRACKET(L) 3 RLA 315D 004 HEADER ASSY 4 RLA 321A 058 PIPE 5 7 RLA 321A 001 PIPE ASSY...
  • Page 106 '14 • SRK-T-154 PANEL & FAN ASSY CRAE0221...
  • Page 107 '14 • SRK-T-154 SRK50ZMA-S END ITEM NO. : RWA002F073C Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 7 RLA 102A 002H PANEL ASSY,FRONT 1 RLA 122A 002 PANEL ASSY,FRONT 2 RLA 435A 006 PANEL ASSY,AIR IN 3 RLA 437A 001 FILTER,AIR W315.5×H330.7(t2) 4 RLA 129A 017...
  • Page 108 '14 • SRK-T-154 HEAT EXCH. & CONTROL CRAE0281...
  • Page 109 '14 • SRK-T-154 SRK50ZMA-S END ITEM NO. : RWA002F073C Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 8 RLA 301A 013A HEAT EXCH ASSY(AIR) 2 RLA 129A 004 BRACKET(L) 3 RLA 315D 004 HEADER ASSY 4 RLA 321A 058 PIPE 5 7 RLA 321A 001B PIPE ASSY...
  • Page 110 '14 • SRK-T-154 PANEL & FAN ASSY CRBE0373...
  • Page 111 '14 • SRK-T-154 SRC20ZMA-S END ITEM NO. : RWC003F095A Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 RCV 122A 001 PANEL,FRONT 2 RCV 123A 001 PANEL,SIDE(R) 3 RCV 124A 001 PANEL,TOP 4 RCV 132A 003 COVER ASSY,SERVICE 5 RCV 435A 001A GRILLE,AIR OUTLET 6 SSA 944B 036B...
  • Page 112 '14 • SRK-T-154 HEAT EXCH. & CONTROL (LIQ.) (GAS) CRBE0374...
  • Page 113 '14 • SRK-T-154 SRC20ZMA-S END ITEM NO. : RWC003F095A Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 RCV 301A 001C HEAT EXCH ASSY(AIR) 2 RCV 321A 200A PIPING ASSY(DISCH) 3 RCV 321A 202A PIPING ASSY(SUCTION) 4 SSA 382C 091 VALVE,S(4WAY) 2 20S 5 8 RCV 304A 009...
  • Page 114 '14 • SRK-T-154 PANEL & FAN ASSY CRBE0373...
  • Page 115 '14 • SRK-T-154 SRC25ZMA-S END ITEM NO. : RWC003F094A Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 RCV 122A 002 PANEL,FRONT 2 RCV 123A 002 PANEL,SIDE(R) 3 RCV 124A 001 PANEL,TOP 4 RCV 132A 004 COVER ASSY,SERVICE 5 RCV 435A 001A GRILLE,AIR OUTLET 6 SSA 944B 036B...
  • Page 116 '14 • SRK-T-154 HEAT EXCH. & CONTROL (LIQ.) (GAS) CRBE0375...
  • Page 117 '14 • SRK-T-154 SRC25ZMA-S END ITEM NO. : RWC003F094A Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 RCV 301A 100 HEAT EXCH ASSY(AIR) 2 RCV 321A 200A PIPING ASSY(DISCH) 3 RCV 321A 202A PIPING ASSY(SUCTION) 4 SSA 382C 091 VALVE,S(4WAY) 2 20S 5 9 RCV 304A 100...
  • Page 118 '14 • SRK-T-154 PANEL & FAN ASSY CRBE0373...
  • Page 119 '14 • SRK-T-154 SRC35ZMA-S END ITEM NO. : RWC003F094B Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 RCV 122A 002 PANEL,FRONT 2 RCV 123A 002 PANEL,SIDE(R) 3 RCV 124A 001 PANEL,TOP 4 RCV 132A 004 COVER ASSY,SERVICE 5 RCV 435A 001A GRILLE,AIR OUTLET 6 SSA 944B 036B...
  • Page 120 '14 • SRK-T-154 HEAT EXCH. & CONTROL (LIQ.) (GAS) CRBE0375...
  • Page 121 '14 • SRK-T-154 SRC35ZMA-S END ITEM NO. : RWC003F094B Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 RCV 301A 100 HEAT EXCH ASSY(AIR) 2 RCV 321A 200A PIPING ASSY(DISCH) 3 RCV 321A 202A PIPING ASSY(SUCTION) 4 SSA 382C 091 VALVE,S(4WAY) 2 20S 5 9 RCV 304A 100...
  • Page 122 '14 • SRK-T-154 PANEL & FAN ASSY CRBE0315...
  • Page 123 '14 • SRK-T-154 SRC50ZMA-S END ITEM NO. : RWC003F083DA Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 RCT 122A 003 PANEL ASSY,FRONT 2 RCT 122A 006 PANEL,SERVICE 3 RCT 124A 002 PANEL,TOP 4 RCT 125A 002 PANEL ASSY,REAR 5 RCT 435A 001 GRILLE,AIR OUTLET 6 RCT 132A 002...
  • Page 124 '14 • SRK-T-154 HEAT EXCH. & CONTROL (LIQ.) (GAS) CRBE0379...
  • Page 125 '14 • SRK-T-154 SRC50ZMA-S END ITEM NO. : RWC003F083DA Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 1000 1 RCT 301A 005 HEAT EXCH ASSY(AIR) 2 5 RCT 304A 016 PIPING ASSY(EXPAN) 2 SSA 387F 051 VALVE,BODY(EXP) 2 EEV 3 SSA 357A 005A STRAINER 4 RCT 315B 002...
  • Page 126 RESIDENTIAL AIR-CONDITIONING TECHNICAL MANUAL & PARTS LIST 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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