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Mitsubishi Heavy Industries SRK20ZSX-WB Technical Manual
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Mitsubishi Heavy Industries SRK20ZSX-WB Technical Manual

Mitsubishi Heavy Industries SRK20ZSX-WB Technical Manual

Inverter wall mounted type residential air-conditioners
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TECHNICAL MANUAL
INVERTER WALL MOUNTED TYPE
RESIDENTIAL AIR-CONDITIONERS
Wi-Fi option model
(Split system, air to air heat pump type)
SRK20ZSX-W
SRK25ZSX-W
SRK35ZSX-W
Note:
•
(1) Indoor unit in this technical manual will have the service code "/A".
• SRK20ZSX-W, -WB, -WT SRK20ZSX-W/A, -WB/A, -WT/A
• SRK25ZSX-W, -WB, -WT SRK25ZSX-W/A, -WB/A, -WT/A
• SRK35ZSX-W, -WB, -WT SRK35ZSX-W/A, -WB/A, -WT/A
Manual No.'21 • SRK-T-303
updated December 23, 2021
/ SRC20ZSX-WA
/ SRC25ZSX-WA
/ SRC35ZSX-WA
#

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Summary of Contents for Mitsubishi Heavy Industries SRK20ZSX-WB

  • Page 1 Manual No.'21 • SRK-T-303 updated December 23, 2021 TECHNICAL MANUAL INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS Wi-Fi option model (Split system, air to air heat pump type) SRK20ZSX-W / SRC20ZSX-WA SRK25ZSX-W / SRC25ZSX-WA SRK35ZSX-W / SRC35ZSX-WA Note: • (1) Indoor unit in this technical manual will have the service code “/A”. •...
  • Page 2 '21 • SRK-T-303 CONTENTS 1. SPECIFICATIONS ..................2. EXTERIOR DIMENSIONS ................12 (1) Indoor units .................... 12 (2) Outdoor units ..................13 (3) Remote control ..................14 3. ELECTRICAL WIRING ................. 17 (1) Indoor units .................... 17 (2) Outdoor units ..................18 4.
  • Page 3 '13 • SRK-T-135 '21 • SRK-T-303 ..........55 (21) Outline of dehumidifying (DRY) opertaion .............. 56 (22) Outline of automatic operation (23) Protective control function ..............56 ................63 (24) Defrost heater control 10. MAINTENANCE DATA ................. 64 (1) Cautions ....................
  • Page 4 '21 • SRK-T-303 1. SPECIFICATIONS SRK20ZSX-W Model Item Indoor unit SRK20ZSX-W Outdoor unit SRC20ZSX-WA Power source 1 Phase 220 - 240V 50Hz / 220V 60Hz Nominal cooling capacity (range) 2.0 ( 0.9(Min.) - 3.4 (Max.)) Nominal heating capacity (range) 2.7 ( 0.8(Min.) - 5.5 (Max.)) Heating capacity (H2) —...
  • Page 5 '21 • SRK-T-303 SRK25ZSX-W Model Item Indoor unit SRK25ZSX-W Outdoor unit SRC25ZSX-WA Power source 1 Phase 220 - 240V 50Hz / 220V 60Hz Nominal cooling capacity (range) 2.5 ( 0.9(Min.) - 3.8 (Max.)) Nominal heating capacity (range) 3.2 ( 0.8(Min.) - 6.0 (Max.)) Heating capacity (H2) —...
  • Page 6 '21 • SRK-T-303 SRK35ZSX-W Model Item Indoor unit SRK35ZSX-W Outdoor unit SRC35ZSX-WA Power source 1 Phase 220 - 240V 50Hz / 220V 60Hz Nominal cooling capacity (range) 3.5 ( 0.9(Min.) - 4.5 (Max.)) Nominal heating capacity (range) 4.3 ( 0.8(Min.) - 6.8 (Max.)) Heating capacity (H2) —...
  • Page 7 '21 • SRK-T-303 SRK20ZSX-WB Model Item Indoor unit SRK20ZSX-WB Outdoor unit SRC20ZSX-WA Power source 1 Phase 220 - 240V 50Hz / 220V 60Hz Nominal cooling capacity (range) 2.0 ( 0.9(Min.) - 3.4 (Max.)) Nominal heating capacity (range) 2.7 ( 0.8(Min.) - 5.5 (Max.)) Heating capacity (H2) —...
  • Page 8 '21 • SRK-T-303 SRK25ZSX-WB Model Item Indoor unit SRK25ZSX-WB Outdoor unit SRC25ZSX-WA Power source 1 Phase 220 - 240V 50Hz / 220V 60Hz Nominal cooling capacity (range) 2.5 ( 0.9(Min.) - 3.8 (Max.)) Nominal heating capacity (range) 3.2 ( 0.8(Min.) - 6.0 (Max.)) Heating capacity (H2) —...
  • Page 9 '21 • SRK-T-303 SRK35ZSX-WB Model Item Indoor unit SRK35ZSX-WB Outdoor unit SRC35ZSX-WA Power source 1 Phase 220 - 240V 50Hz / 220V 60Hz Nominal cooling capacity (range) 3.5 ( 0.9(Min.) - 4.5 (Max.)) Nominal heating capacity (range) 4.3 ( 0.8(Min.) - 6.8 (Max.)) Heating capacity (H2) —...
  • Page 10 '21 • SRK-T-303 SRK20ZSX-WT Model Item Indoor unit SRK20ZSX-WT Outdoor unit SRC20ZSX-WA Power source 1 Phase 220 - 240V 50Hz / 220V 60Hz Nominal cooling capacity (range) 2.0 ( 0.9(Min.) - 3.4 (Max.)) Nominal heating capacity (range) 2.7 ( 0.8(Min.) - 5.5 (Max.)) Heating capacity (H2) —...
  • Page 11 '21 • SRK-T-303 SRK25ZSX-WT Model Item Indoor unit SRK25ZSX-WT Outdoor unit SRC25ZSX-WA Power source 1 Phase 220 - 240V 50Hz / 220V 60Hz Nominal cooling capacity (range) 2.5 ( 0.9(Min.) - 3.8 (Max.)) Nominal heating capacity (range) 3.2 ( 0.8(Min.) - 6.0 (Max.)) Heating capacity (H2) —...
  • Page 12 '21 • SRK-T-303 SRK35ZSX-WT Model Item Indoor unit SRK35ZSX-WT Outdoor unit SRC35ZSX-WA Power source 1 Phase 220 - 240V 50Hz / 220V 60Hz Nominal cooling capacity (range) 3.5 ( 0.9(Min.) - 4.5 (Max.)) Nominal heating capacity (range) 4.3 ( 0.8(Min.) - 6.8 (Max.)) Heating capacity (H2) —...
  • Page 13 '21 • SRK-T-303 2. EXTERIOR DIMENSIONS (1) Indoor units Models SRK20ZSX-W, 25ZSX-W, 35ZSX-W SRK20ZSX-WB, 25ZSX-WB, 35ZSX-WB SRK20ZSX-WT, 25ZSX-WT, 35ZSX-WT RLF000Z202...
  • Page 14 '21 • SRK-T-303 (2) Outdoor units Models SRC20ZSX-WA, 25ZSX-WA, 35ZSX-WA RCT000Z027...
  • Page 15 '21 • SRK-T-303 (3) Remote control (3) Remote control (a) Wireless remote control Unit : mm...
  • Page 16 '21 • SRK-T-303 (b)　Wired remote control (Option parts) 　　 Interface kit (SC-BIKN2-E) is required to use the wired remote control. 　　Model RC-EX3A Installation space Dimensions (Viewed from front) 30mm 30mm 配線 Wiring 30mm 30mm 30mm 30mm 固定穴 Fixing holes R/C temperature sensor Secure minimum spaces for disassembling the case.
  • Page 17 '21 • SRK-T-303 Model RC-E5 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 from upper left from center 0.3mm...
  • Page 18 '21 • SRK-T-303 3. ELECTRICAL WIRING (1) Indoor units Models SRK20ZSX-W, 25ZSX-W, 35ZSX-W SRK20ZSX-WB, 25ZSX-WB, 35ZSX-WB SRK20ZSX-WT, 25ZSX-WT, 35ZSX-WT RWA000Z413...
  • Page 19 '21 • SRK-T-303 (2) Outdoor units Models SRC20ZSX-WA, 25ZSX-WA, 35ZSX-WA RWC000Z307...
  • Page 20 '21 • SRK-T-303 4. NOISE LEVEL (1) Sound power level Models SRK20ZSX-W,-WB,-WT Condition ISO5151 T1/H1 (Indoor unit) MODE Rated capacity value (Hi) Model SRK20ZSX-W, -WB, -WT Noise Cooling 53 dB(A) Level Heating 55 dB(A) × ..Cooling, Heating 70.0 60.0 50.0 40.0 30.0...
  • Page 21 '21 • SRK-T-303 Condition ISO5151 T1/H1 Models SRK25ZSX-W,-WB,-WT (Indoor unit) MODE Rated capacity value (Hi) Model SRK25ZSX-W,-WB,-WT Cooling 55 dB(A) Noise Level Heating 56 dB(A) × ..Cooling, Heating 70.0 60.0 50.0 40.0 30.0 20.0 10.0 1000 2000 4000 8000 Mid octave band frequency (Hz) (Outdoor unit) Model...
  • Page 22 '21 • SRK-T-303 Condition ISO5151 T1/H1 Models SRK35ZSX-W,-WB,-WT (Indoor unit) MODE Rated capacity value (Hi) Model SRK35ZSX-W,-WB,-WT Cooling 58 dB(A) Noise Level Heating 58 dB(A) × ..Cooling, Heating 70.0 60.0 50.0 40.0 30.0 20.0 10.0 1000 2000 4000 8000 Mid octave band frequency (Hz) (Outdoor unit) Model...
  • Page 23 '21 • SRK-T-303 (2) Sound pressure level Rated capacity value Models SRK20ZSX-W,-WB,-WT Condition ISO5151 T1/H1 (Indoor unit) MODE Rated capacity value (Hi) Model SRK20ZSX-W,-WB,-WT Noise Cooling 38 dB(A) Mike position Level Heating 38 dB(A) 0.8m Unit Mike position (Center & low points) ×...
  • Page 24 '21 • SRK-T-303 Condition ISO5151 T1/H1 Models SRK25ZSX-W,-WB,-WT (Indoor unit) MODE Rated capacity value (Hi) Model SRK25ZSX-W,-WB,-WT Mike position Cooling 39 dB(A) Noise Level Heating 40 dB(A) 0.8m Unit 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 25 '21 • SRK-T-303 Condition ISO5151 T1/H1 Models SRK35ZSX-W,-WB,-WT (Indoor unit) MODE Rated capacity value (Hi) Model SRK35ZSX-W,-WB,-WT Mike position Noise Cooling 43 dB(A) Level Heating 42 dB(A) 0.8m Unit 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 26 '21 • SRK-T-303 (b) Each fan speed mode Condition ISO5151 T1/H1 (Indoor unit) MODE Model SRK20ZSX-W,-WB,-WT Noise Cooling 31 dB(A) Mike position Level Heating 33 dB(A) 0.8m Unit Mike position (Center & low points) × ..Cooling, Heating Mike position: at highest noise level in position as mentioned below Distance from front side 1m 1000 2000...
  • Page 27 '21 • SRK-T-303 Condition ISO5151 T1/H1 (Indoor unit) MODE Model SRK20ZSX-W,-WB,-WT Cooling 19 dB(A) Noise Mike position Level Heating 19 dB(A) 0.8m Unit 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 28 '21 • SRK-T-303 Condition ISO5151 T1/H1 (Indoor unit) MODE Model SRK25ZSX-W,-WB,-WT Cooling 33 dB(A) Noise Mike position Level Heating 34 dB(A) 0.8m Unit Mike position (Center & low points) × ..Cooling, Heating Mike position: at highest noise level in position as mentioned below Distance from front side 1m 1000 2000...
  • Page 29 '21 • SRK-T-303 Condition ISO5151 T1/H1 (Indoor unit) MODE Model SRK25ZSX-W,-WB,-WT Noise Cooling 19 dB(A) Mike position Level Heating 19 dB(A) 0.8m Unit 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 30 '21 • SRK-T-303 Condition ISO5151 T1/H1 (Indoor unit) MODE Model SRK35ZSX-W,-WB,-WT Cooling 35 dB(A) Noise Mike position Level Heating 35 dB(A) 0.8m Unit Mike position (Center & low points) × ..Cooling, Heating Mike position: at highest noise level in position as mentioned below Distance from front side 1m 1000 2000...
  • Page 31 '21 • SRK-T-303 Condition ISO5151 T1/H1 (Indoor unit) MODE Model SRK35ZSX-W,-WB,-WT Cooling 19 dB(A) Noise Mike position Level Heating 19 dB(A) 0.8m Unit 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 32 '21 • SRK-T-303 5. PIPING SYSTEM Models SRK20ZSX-W, -WB,WT, 25ZSX-W,WB,WT, 35ZSX-W,-WB,-WT Cooling cycle Heating cycle Indoor unit Outdoor air Outdoor unit temperature Flare sensor connection Service valve (TH3) (Gas) Gas pipe Muffler Heat Discharge pipe exchanger Check joint temperature sensor (φ9.52) Room temperature temperature...
  • Page 33 '21 • SRK-T-303 6. RANGE OF USAGE & LIMITATIONS RANGE OF USAGE & LIMITATIONS Model SRK20, 25, 35ZSX-W,-WB,-WT Item Cooling operation : Approximately 18 to 32℃ DB Indoor return air temperature Heating operation : Approximately 10 to 30℃ DB (Upper, lower limits) (Refer to the selection chart) Cooling operation : Approximately -15 to 46℃...
  • Page 34 '21 • SRK-T-303 (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 t i n...
  • Page 35 '21 • SRK-T-303 7. CAPACITY TABLES Models SRK20ZSX-W,-WB,-WT / SRC20ZSX-WA (kW) Heating mode (HC) (kW) Cooling mode Indoor air temperature Outdoor Outdoor indoor air temperature Air flow 21˚CDB 23˚CDB 26˚CDB 27˚CDB 28˚CDB 31˚CDB 33˚CDB temperature Air flow temperature 14˚CWB 16˚CWB 18˚CWB 19˚CWB 20˚CWB...
  • Page 36 '21 • SRK-T-303 8. APPLICATION DATA RLF012A202D RLF012A202D (1) Installation of indoor unit Model SRK20,25,35,50,60ZSX SRK20,25,35,50,60ZSXA R32/R410A REFRIGERANT USED • W • This installation manual deals with an indoor unit installation only. For an outdoor unit installation, refer to page 39. •...
  • Page 37 '21 • SRK-T-303 2. SELECTING INSTALLATION LOCATION After getting customer’s approval, select installation location according to following guidelines. 6.5cm minimum from the ceiling (In the case of less than 10cm, Installation example 1. Indoor unit there is a possibility of performance •...
  • Page 38 '21 • SRK-T-303 6. FORMING PIPING AND DRAIN HOSE 1. Forming piping Pipings Piping is possible in the right, rear, downward, left, left rear or left downward direction. Forming of pipings Taping of the exterior • Hold the bottom of the •...
  • Page 39 '21 • SRK-T-303 10. HOW TO OPEN, CLOSE, REMOVE AND INSTALL 13. INSTALLING TWO AIR-CONDITIONERS IN THE SAME ROOM THE AIR INLET PANEL 1. Open In case two air-conditioners are installed in the same room, apply this setting so that one unit can be Air inlet panel operated with only one remote control.
  • Page 40 '21 • SRK-T-303 (2) Installation of outoor unit RWC012A063B RWC012A063B Model SRC20,25,35,40,50,60ZSX-W SRC20,25,35ZSX-WA R32 REFRIGERANT USED • This installation manual deals with an outdoor unit installation only. For an indoor unit installation, refer to page 35. SAFETY PRECAUTIONS • Before installation, read the “SAFETY PRECAUTIONS” carefully and strictly follow it during the installa- •...
  • Page 41 '21 • SRK-T-303 2. OUTDOOR UNIT INSTALLATION Note as a unit designed for R32 3. Installation space • Do not use any refrigerant other than R32. R32 will rise to pressure about 1.6 times higher than that of • There must be 1 meter or larger space between the unit and the wall in at least 1 of the 4 sides. a conventional refrigerant.
  • Page 42 '21 • SRK-T-303 4. CONNECTING PIPING WORK 1. Restrictions on unit installation 4. Evacuation Abide by the following restrictions on unit installation. (1) Connect vacuum pump to gauge manifold. Connect charge hose of gauge manifold to service port of outdoor unit. Improper installation can cause compressor failure or performance degradation.
  • Page 43 '21 • SRK-T-303 6. PUMP DOWN (1) Connect charge hose of gauge manifold to service port of outdoor unit. Gauge manifold (2) Close the liquid service valve with hexagonal wrench key. (3) Fully open the gas service valve with hexagonal wrench key. (4) Carry out forced cooling operation (For forced cooling operation procedure, refer to indoor unit installation manual).
  • Page 44 '21 • SRK-T-303 (3) Safety precautions in handling air-conditioners with flammable refrigerant WALL TYPE AIR-CONDITIONER RSA012A061A R32 REFRIGERANT USED There is information included in the user’s manual and/or is leaked, together with an external ignition source, there is a installation manual. possibility of ignition.
  • Page 45 '21 • SRK-T-303 CAUTION • 6. Repair to intrinsically safe components 13. Labelling • Do not apply any permanent inductive or • Equipment shall be labelled stating that it has been capacitance loads to the circuit without ensuring de-commissioned and emptied of refrigerant. The the working pressure is achieved, then venting to that this will not exceed the permissible voltage and label shall be dated and signed.
  • Page 46 '21 • SRK-T-303 9. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Operation control function by wireless remote control Transmission section OPERATION MODE select button ON/OFF (luminous) button Each time the button is pressed, the Press to start operation, press again mode changes.
  • Page 47 '09•SRK-DB-087D '21 • SRK-T-303 '09•SRK-DB-087D (2) Unit ON/OFF button (2) Unit ON/OFF button wireless wireless (a) Operation (a) Operation (b) Details of operation room (b) Details of operation whether to go into the COOL, DRY or HEAT modes. Function Room temperature Fan speed Flap/Louver Timer switch setting Operation mode...
  • Page 48 Jumpre wire (J1) '21 • SRK-T-303 Jumpre wire (J1) (5) Selection of the annual cooling function (a) The annual cooling control is valid from factory default setting. It is possible to disable by cutting jumper wire (J3), or changing the setting of DIP switch (SW2-4) on the interface kit (option) PCB if it is connected.
  • Page 49 '21 • SRK-T-303 (8) Economy operation Pressing the HI POWER/ECONOMY button initiate a soft operation with the power suppressed in order to avoid an excessive cooling (a) Pressing the HI/ECO button initiates a soft operation with the power suppressed in order to avoid an excessive cooling or heating. (b) The remote control displays.
  • Page 50   Wireless remote   Angle of flap from horizontal control display '21 • SRK-T-303 Wireless remote Approx. 20° COOL, DRY, FAN Approx. 15° Approx. 25° Approx. 30° Approx. 55° control display HEAT Approx. 30° Approx. 40° Approx. 45° Approx. 50° Approx.
  • Page 51 AUTO < = Room temp. – Setting temp. >5°C Room temp. – Setting temp. 5°C Cooling HIGH POWER AUTO < = Setting temp. – Room temp. >5°C Setting temp. – Room temp. 5°C '21 • SRK-T-303 Heating HIGH POWER AUTO (ii) room Cooling...
  • Page 52 '21 • SRK-T-303 (e) Combination of patterns which can be set for the timer operations Item Sleep timer OFF timer ON timer Weekly timer Item Sleep timer Í Í OFF timer Í Í '09•SRK-DB-087D ON timer Í Weekly timer Í Í...
  • Page 53 (Center installation) (Right end installation) (Left end installation) '21 • SRK-T-303 Air f low range Air f low range Air f low range (Left end installation) (Center installation) (Right end installation) (iv) Press the ON/OFF button. (15) Display brightness adjustment This function can be used when it is necessary to adjust the brightness of unit display.
  • Page 54 '21 • SRK-T-303 (18) Fan control during heating thermostat OFF (i) Following fan controls during the heating thermostat OFF can be selected with the wireless remote control. 1) Normal thermostat operation 2) Fireplace 3) Interval 4) Stop (ii) When the “Normal thermostat operation” is selected, the indoor fan is controlled by HOT KEEP. (iii) When the “Fireplace”...
  • Page 55 Interval and Stop can be established. In the case, indoor air temperature is detected by sensor on the wired remote control. (ii) Hot keep operation '21 • SRK-T-303 During the heating operation, the indoor fan speed can be controlled based on the temperature of the indoor heat (b) Details of control at each operation mode (pattern) exchanger (Th2) to prevent blowing out of cold air.
  • Page 56 (ii) Contents of control Unit : °C Signal of wireless remote control (Display) '21 • SRK-T-303 Before setting After setting (iii) Reset condition '09•SRK-DB-087D Push ON/OFF button 30 seconds or more during setting this mode. At completion of the reset, the indoor (d) Countermeasure for excessive temperature rise unit emits a buzzer sound “Pip Pip Pip”.
  • Page 57 12-50rps 12-58rps 12-74rps 12-34rps 12-38rps 12-54rps 12-30rps 12-34rps 12-42rps '21 • SRK-T-303 12-30rps 12-30rps 12-30rps (22) Outline of automatic operation (a) Determination of operation mode (a) Determination of operation mode Operation mode is determined by indoor air temperature and outdoor air temperature as following. Cooling Cooling Indoor air...
  • Page 58 '21 • SRK-T-303 When this control has continued for more than 30 minutes continuously,the following wind direction control is performed. '09•SRK-DB-087D '09•SRK-DB-087D a) When the vertical wind direction is set at other than the vertical swing,the flaps change to the horizontal position. b) When the horizontal wind direction is set at other than the horizontal swing,the louver changes to the vertical position.
  • Page 59 (iii) Reset conditions '21 • SRK-T-303 37°C. Cooling high pressure control Purpose Prevents anomalous high pressure operation during cooling. (ii) Detector Outdoor heat exchanger sensor (TH2) (iii) Detail of operation (Example) Compressor speed Range B 8rps After lapse of 30 sec. or over Range A 8rps After lapse of 30 sec.
  • Page 60 ( f ) Heating high pressure control Purpose '21 • SRK-T-303 (ii) Detector (iii) Detail of operation (Example) 4rps 8rps After lapse of 20 sec. or over Compressor After lapse of 20 sec. or over 4rps 8rps speed lower limit After lapse of 20 sec.
  • Page 61 '21 • SRK-T-303 Reset conditions The outdoor air temperature (TH3) is lower than 11°C. (h) Heating low outdoor temperature protective control Operating conditions When the outdoor air temperature (TH3) is lower than 4℃ or higher continues for 30 seconds while the compressor speed is other than 0 rps (ii) Detail of operation...
  • Page 62 '21 • SRK-T-303 has elapsed ( j ) Current safe Purpose (ii) Detail of operation ( k ) Current cut Purpose (ii) Detail of operation ( l ) Outdoor unit failure air-conditioning. item (i), (ii) is satisfied. Once the unit is stopped by this function, it is not (ii) (m) Indoor fan motor protection air-conditioner...
  • Page 63 Outdoor fan '21 • SRK-T-303 Outdoor air temperature > 10˚C Outdoor air temperature < = 10˚C (TH2) (TH2) 21°C -38°C (TH2) Reset conditions (TH3) (ii) Heating Operating conditions (TH3) -2°C Detail of operation Reset conditions 0°C (TH3) Refrigeration cycle system protection ( r ) Refrigeration cycle system protection Starting conditions...
  • Page 64 '21 • SRK-T-303 (24) Defrost heater control Starting conditions When all of the following conditions (i) – (iv) have been satisfied for 1 minute continuously, with the compressor frequency at 0 rps or higher: (i) Operation is in the heating mode. (ii) Outdoor heat exchanger temperature(TH2) is lower than - 2.0°C.
  • Page 65 '21 • SRK-T-303 10. MAINTENANCE DATA (1) Cautions (2) Items to check before troubleshooting source (3) Troubleshooting procedure (If the air-conditioner does not run at all) satisfied Important 198 - 264V source wireless proced-...
  • Page 66 '09•SRK-DB-087D '21 • SRK-T-303 (4) Troubleshooting procedure (If the air-conditioner runs) service 67 - 73. service 67 - 73.
  • Page 67 '09•SRK-DB-087D '21 • SRK-T-303 (5) Self-diagnosis table air-conditioner air-conditioner air-conditioner Wired Indoor unit display panel remote Description Cause Display (flashing) condition control TIMER of trouble display light light • Broken heat exchanger sensor When a heat exchanger sensor 1 wire disconnection is detected while 1-time operation is stopped.
  • Page 68 '09•SRK-DB-087D '21 • SRK-T-303 (6) Service mode (Trouble mode access function) air-conditioner (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 69 '09•SRK-DB-087D '21 • SRK-T-303 4-time flash 2-time flash. wireless mode mode air-conditioner Self-diagnosis data What are 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 70 '09•SRK-DB-087D '21 • SRK-T-303 (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 71 '09•SRK-DB-087D '21 • SRK-T-303 (c) Error code, stop code table Number of flashes when in service mode Stop coad Error Auto Error content Cause Occurrence conditions TIMER display recovery light light Error coad (10's digit) (1's digit) Normal The wired remote control wire Y is open. The wired remote control wires X and Y are reversely connected.
  • Page 72 '09•SRK-DB-087D '21 • SRK-T-303 service mode 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 73 '09•SRK-DB-087D '21 • SRK-T-303 (e) Temperatare information Room temperature sensor, indoor heat exchanger sensor, outdoor air temperature sensor, outdoor heat exchanger 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 Sensor name...
  • Page 74 '09•SRK-DB-087D '21 • SRK-T-303 (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 75 '09•SRK-DB-087D '21 • SRK-T-303 Service data record form Wireless r Operation mode Fan speed mode Wireless r Wireless r Wireless r Wireless r Wireless r wireless 68.)
  • Page 76 '09•SRK-DB-087D '21 • SRK-T-303 (7) Inspection procedures corresponding to detail of trouble Sensor error Broken sensor wire, connector poor connection Temperature sensor characteristics (Room Discharge pipe temperature sensor characteristics temperature, indoor heat exchanger temperature, outdoor heat exchanger temperature, outdoor air temperature) (Short-circuit) (Short-circuit) - 10...
  • Page 77 '09•SRK-DB-087D '21 • SRK-T-303 Current cut Compressor lock, Compressor wiring short-circuit, Compressor output is open phase, Outdoor unit PCB is faulty, Service valve is closed, EEV is faulty, Compressor faulty. short-circuit? unit ＊   Defective outdoor unit PCB ＊ Defective outdoor unit PCB between terminals.
  • Page 78 '09•SRK-DB-087D '21 • SRK-T-303 Over heat of compressor Gas shortage, defective discharge pipe temperature sensor temperature temperature Defective outdoor unit PCB Error of signal transmission Wiring error including power cable, defective indoor/ outdoor unit PCB ② ③ unit ② ③ unit ①...
  • Page 79 '09•SRK-DB-087D '21 • SRK-T-303 Trouble of outdoor unit Insufficient refregerant amount, Faulty power transistor, Broken compressor wire Service valve close, Defective EEV, Defective outdoor unit PCB unit ◆  unit     defrost operation   minutes or more Notes (1) (2) Check resistance between terminals, see page 76. unit between terminals ．...
  • Page 80 '21 • SRK-T-303 Rotor lock Defective compressor, defective outdoor unit PCB unit between terminals. See page 76. Service valve (gas side) closed, Service valve (gas side) closed operation (8) Phenomenon observed after shortcircuit, wire breakage on sensor Defective outdoor unit PCB (a) Indoor unit Phenomenon Operation...
  • Page 81 '21 • SRK-T-303 (8) Phenomenon observed after short-circuit, wire breakage on sensor (a) Indoor unit Phenomenon Operation Sensor mode Short-circuit Disconnected wire Cooling Room temperature sensor Heating Cooling Freezing cycle system protection trips and stops the compressor. Heat exchanger temperature sensor Heating Cooling Humidity sensor...
  • Page 82 '21 • SRK-T-303 (b) Indoor fan motor check procedure 1) Indoor unit PCB output check ① ④ ⑤ DC several V (–) DC 308-336V (4-6 V) Measuring Voltage range when DC15V point normal ①  −  ③ − Indoor unit PCB ⑥...
  • Page 83 Operation SW ON Measure in this section '21 • SRK-T-303 (10) How to make sure of wireless remote control wireless wireless wireless wireless wireless wireless   Simplified check method 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 84 '21 • SRK-T-303 (12) Outdoor unit inspection points Models SRC20ZSX-WA, 25ZSX-WA, 35ZSX-WA ◆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 : AC220/230/240V unit is stopped.
  • Page 85 '09•SRK-DB-087D '21 • SRK-T-303 (a) Inspection of electronic expansion valve (ii) (iii) unit (iv) • Inspection of electronic expansion valve as a separate unit Measuring point Resistance when normal (b) Outdoor fan motor check procedure unit unit          source ② unit unit Measuring...
  • Page 86 '21 • SRK-T-303 11. INDOOR UNIT DISASSEMBLY PROCEDURE...
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  • Page 92 '21 • SRK-T-303 12. OPTION PARTS (1) Wired remote control PJZ012A171 (a) Model RC-EX3A 1 ）Safety precautions 　 ●Please read this manual carefully before starting installation work to install the unit properly. Every one of the followings is important information to be observed strictly. Failure to follow these instructions properly may result in serious WARNING consequences such as death, severe injury, etc.
  • Page 93 '21 • SRK-T-303 　 WARNING Do not install the unit in appropriate environment or where inflammable gas could generate, flow in, accumulate or leak. t f I s i t c a l s n i l i o , t s i v l o , r o corrosive gas (ammonium, sulfuric compound, acid, etc) or where acidic or alkaline...
  • Page 94 '21 • SRK-T-303 　 CAUTION Do not install the remote control at following places. i t a r t n . l o ・Where it is exposed to direct sunlight ・Where the ambient temperature becomes 0 ° C or below, or 40 ° C or above ・...
  • Page 95 '21 • SRK-T-303 2 ）Accessories & prepare on site 　 Following parts are provided. Accessories R/C main unit, wood screw (φ3.5 x 16) 2 pcs., Quick reference Following parts are arranged at site. Prepare them according to the respective installation procedures. When the cable length is longer than 100 m, Item name Q’ty...
  • Page 96 '21 • SRK-T-303 　 4）Installation procedure Perform installation and wiring work for the remote control according to the PCB side (Viewed from rear) following procedure. Dimensions (Viewed from front) Fixing holes 固定穴 センサー 端子 Sensor USB port Terminal block To disassemble the R/C case into the upper and lower pieces after assembling them once ess at the lower part of R/C and twist it lightly to remove.
  • Page 97 ブッ シング パテで シール する こ と '21 • SRK-T-303 　 リ モコ ン配線 ③ Connect wires from X and Y terminals of R/C to X and Y terminals of indoor unit. R/C wires (X, Y) have no polarity. Fix wires such that the wires will run around the terminal screws on the top case of R/C.
  • Page 98 '21 • SRK-T-303 　 5） Main/Sub setting when more than one remote control are used ○ : operable ×: not operable Up to two units of R/C can be used R/C operations Main Sub R/C operations Main Sub ○ Service Installation Installation date ×...
  • Page 99 '21 • SRK-T-303 PJA012D730 Installation manual for wired remote controller (b) Model RC-E5 Connect the remote con terminal block. Connect the terminal of r Read together with indoor unit's installation manual. with the terminal of indoo (X and Y are no polarity) WARNING Wiring route is as shown Fasten the wiring to the terminal securely and hold the cable securely so as not to apply unexpected stress on the...
  • Page 100 '21 • SRK-T-303 ote controller Connect the remote control cord to the Sheath Sheath The range of temperature settin terminal block. When shipped, the range of set te Connect the terminal of remote control (X,Y) Upper case Upper case Board Board Heating : 16 ~ 30˚C (55 ~ 86˚F with the terminal of indoor unit (X,Y).
  • Page 101 '21 • SRK-T-303 PJA012D730 Sheath The range of temperature setting When shipped, the range of set temperature differs depending on the operation mode as below. 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 102 '21 • SRK-T-303 The functional setting The initial function setting for typical using is performed automatically by the indoor unit connected, when remote Note 1: The initial setting marked “ ” is decided by connected indoor and outdoor unit, and is automatically defined as following table. control and indoor unit are connected.
  • Page 103 PJA012D73 '21 • SRK-T-303 PJA012D730 ned as following table. omatically defined as following table. Operation message How to set function Operation message How to set function Function description: ndoor unit. Function description: Function No. Stop air-conditioner and press (SET) (MODE) setting description: Function No.
  • Page 104 '21 • SRK-T-303 '17 • SRK-T-211 (c) Operation and setting from wired remote control Blank：Not compatible −：No function on remote control ○：Correspondence △：Corresponding part Setting ＆ display item Description RC-EX3A RC-E5 1.Remote control network 1 Control plural indoor units by a single remote control A remote control can control plural indoor units up to 16 (in one group of remote control network).
  • Page 105 '21 • SRK-T-303 Setting ＆ display item Description RC-EX3A RC-E5 2 Administrator settings Permission/Prohibition setting ・Permission/Prohibition setting of operation can be set. [On/Off] [Change set temp] [Change operation mode] [Change flap direction] [Change fan speed] [High power operation] [Energy-saving operation] [Timer] [Administrator password] ○...
  • Page 106 '21 • SRK-T-303 Setting ＆ display item Description RC-EX3A RC-E5 IU address Max 16 indoor units can be connected to one remote control, and all address No. of the connected indoor units can be displayed. 4 Service & Maintenance ・ The indoor unit conforming to the address No. can be identified by selecting the address No. and tapping [Check] to ○...
  • Page 107 '21 • SRK-T-303 (2) Interface kit (SC-BIKN2-E) ※ When RC-EX3A is connected, please use SC-BIKN2-E by all means. RKZ012A099 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 108 '21 • SRK-T-303 Installation of the interface ・Install the interface within the range of the connection cable length (approximately 1.3m) from the indoor unit. 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 109 '21 • SRK-T-303 Functions of CnT connector It is available to operate the air-conditioner 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. Note (1) 0.3mm 0.75mm ×2m...
  • Page 110 '21 • SRK-T-303 Connection of wired remote control Regarding the connection of wired remote control, refer to the installation manual of wired remote control. ①Switch ON the DIP switch SW2-2 (Factory setting : ON) on the interface PCB. DIP switch Caution:Wireless remote control attached to the indoor unit can be used in parallel, after connecting the wired remote control.
  • Page 111 (3) Wireless LAN interface kit (WF-RAC) RKZ012A105 • This installation manual can also be viewed on the home page of MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. • Please download USER’S MANUAL (Including the guarantee form) via the QR code or from the home page described later.
  • Page 112 '21 • SRK-T-303 WARNING ● Do not bundle, roll, or step on connection cables to prevent cables from becoming deformed. (Deformation may cause heat generation, fire, or electric shocks due to loose connection, insulation failure, current exceeding the allowable limit, etc.) ●...
  • Page 113 '21 • SRK-T-303 WARNING ● In the installation work, install the product securely according to this installation manual, and be sure to use accessories and specified parts for installation. (Improper installation may cause a water leakage, electric shock, or fire.) ●...
  • Page 114 '21 • SRK-T-303 WARNING ● This appliance is not intended for use by persons (Including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
  • Page 115 '21 • SRK-T-303 CAUTION ● Do not use the product near another wireless device, microwave, cordless phone, fax machine, etc. (Improper use may cause malfunction.) ● To prevent any failure due to electrical discharge, touch your hand with metal around you to remove static electricity from your body before you touch this product.
  • Page 116 '21 • SRK-T-303 1. Selecting the installation location and installing the main body ＜Selecting the installation location＞ Install this product in a location that satisfies the following conditions with the agreement of your customer. ● A location where this product is not exposed to direct sunlight ●...
  • Page 117 '21 • SRK-T-303 ＜Cautions for installation＞ ● Do not mount the holder and main unit inside the indoor unit. ● Fix the holder on a wall, pillar, etc. securely with attached screws. (Do not mount it on a clay wall, etc.) ●...
  • Page 118 '21 • SRK-T-303 2. Connecting this product with the indoor unit To CNS Connection Printed-circuit Connector cable board Connect the indoor unit connection cable to the indoor control printed- circuit board. ・ For the connection of the indoor unit, refer to the “description for connecting the interface kit”...
  • Page 119 '21 • SRK-T-303 After the installation work is completed, be sure to check the following. Installation work check items □ Is the holder fixed securely? □ Is the cable trapped? Is the connection cable under a load? □ Is the connector connected properly and securely? □...
  • Page 120 User's Manual Refer to the home page of MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. http://www.mhi-mth.co.jp/en/products/detail/air-conditioner_ users_manual.html ● CE Marking Refer to the home page of MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. https://www.mhi-mth.co.jp/en/technology/ce_marking.php...
  • Page 121 '21 • SRK-T-303 (4) Superlink E board (SC-ADNA-E) PJZ012D029K...
  • Page 122 '21 • SRK-T-303 cores cores cores cores cores make cores cores...
  • Page 123 '21 • SRK-T-303 13. TECHNICAL INFORMATION Model SRK20ZSX-W Information to identify the model(s) to which the information relates to: If function includes heating: Indicate the heating season the Indoor unit model name SRK20ZSX-W information relates to. Indicated values should relate to one SRC20ZSX-WA Outdoor unit model name heating season at a time.
  • Page 124 '21 • SRK-T-303 Model SRK25ZSX-W Information to identify the model(s) to which the information relates to: If function includes heating: Indicate the heating season the Indoor unit model name SRK25ZSX-W information relates to. Indicated values should relate to one SRC25ZSX-WA Outdoor unit model name heating season at a time.
  • Page 125 '21 • SRK-T-303 Model SRK35ZSX-W Information to identify the model(s) to which the information relates to: If function includes heating: Indicate the heating season the Indoor unit model name SRK35ZSX-W information relates to. Indicated values should relate to one SRC35ZSX-WA Outdoor unit model name heating season at a time.
  • Page 126 '21 • SRK-T-303 Model SRK20ZSX-WB Information to identify the model(s) to which the information relates to: If function includes heating: Indicate the heating season the Indoor unit model name SRK20ZSX-WB information relates to. Indicated values should relate to one SRC20ZSX-WA Outdoor unit model name heating season at a time.
  • Page 127 '21 • SRK-T-303 Model SRK25ZSX-WB Information to identify the model(s) to which the information relates to: If function includes heating: Indicate the heating season the Indoor unit model name SRK25ZSX-WB information relates to. Indicated values should relate to one SRC25ZSX-WA Outdoor unit model name heating season at a time.
  • Page 128 '21 • SRK-T-303 Model SRK35ZSX-WB Information to identify the model(s) to which the information relates to: If function includes heating: Indicate the heating season the Indoor unit model name SRK35ZSX-WB information relates to. Indicated values should relate to one SRC35ZSX-WA Outdoor unit model name heating season at a time.
  • Page 129 '21 • SRK-T-303 Model SRK20ZSX-WT Information to identify the model(s) to which the information relates to: If function includes heating: Indicate the heating season the Indoor unit model name SRK20ZSX-WT information relates to. Indicated values should relate to one SRC20ZSX-WA Outdoor unit model name heating season at a time.
  • Page 130 '21 • SRK-T-303 Model SRK25ZSX-WT Information to identify the model(s) to which the information relates to: If function includes heating: Indicate the heating season the Indoor unit model name SRK25ZSX-WT information relates to. Indicated values should relate to one SRC25ZSX-WA Outdoor unit model name heating season at a time.
  • Page 131 '21 • SRK-T-303 Model SRK35ZSX-WT Information to identify the model(s) to which the information relates to: If function includes heating: Indicate the heating season the Indoor unit model name SRK35ZSX-WT information relates to. Indicated values should relate to one SRC35ZSX-WA Outdoor unit model name heating season at a time.
  • Page 132 '21 • SRK-T-303 14. REFERENCE (1) Outline 1-1) R32 as the alternative refrigerant for residential air-conditioners As for the R410A refrigerant which we have been usually using for air-conditioners, in case of emissions into the atmo- sphere, we have been adopting the collection of refrigerant etc. in order to restrain the world from global warming. Based on the 4th basic ecological plan, it is said that the amount of emission of the green house effect gases including the refrigerants which are being used for air-conditioners shall be reduced 80% by 2050, emissions of any kind of freon gases which have especially high global warming coefficient must be reduced much more.
  • Page 133 '21 • SRK-T-303 Table2 Comparison of saturated vapour pressure (MPa) Refrigerant R410A Temperature 0.30 0.30 0.14 0.71 0.70 0.40 1.37 1.35 0.81 2.38 2.32 1.43 3.84 3.73 2.33 4.29 4.17 2.60 1-3) Combustion charactaristic R32 is possible to combust slightly when following conditions (gas density and ignition energy) coincide. a) Combustible gas density by mixture with the air In the event that if the ignition source which is possible to ignite is within the gas density mentioned in table 3, R32 might combust.
  • Page 134 '21 • SRK-T-303 (2) Cautions for safety 2-1) Transport of equipment containing fl ammable refrigerants It is necessary to follow the applicable transport regulations during the transportation with respect to equipment containing fl ammable gas. 2-2) Marking of equipment using signs All required signs are to be maintained and employers should ensure that employees receive suitable and suffi cient instruc- tion and training on the meaning of appropriate safety signs and the actions that need to be taken in connection with these signs.
  • Page 135 '21 • SRK-T-303 (3) General 3-1) The following information shall be specified in the manual where the information is needed for the function of the manual and as applicable to the appliance: (a) Information for spaces where refrigerant pipes are allowed, including statements •...
  • Page 136 '21 • SRK-T-303 ►Checks to the area Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure that the risk of ig- nition is minimised. For repair to the refrigerating system, following precautions shall be taken prior to conducting work on the system. ►Work procedure Work shall be undertaken under a controlled procedure so as to minimise the risk of a flammable gas or vapour being present while the work is being performed.
  • Page 137 '21 • SRK-T-303 The following checks shall be applied to installations using flammable refrigerants including R32: – The charge size is in accordance with the room size within which the refrigerant containing parts are installed; – The ventilation machinery and outlets are operating adequately and are not obstructed; –...
  • Page 138 '21 • SRK-T-303 ►Cabling (1) Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse environmental effects. The check shall also take into account the effects of aging or continual vibration from sources such as compressors or fans.
  • Page 139 '21 • SRK-T-303 ►Charging procedures In addition to conventional charging procedures, the following requirements shall be followed. – Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses or lines shall be as short as possible to minimise the amount of refrigerant contained in them. –...
  • Page 140 '21 • SRK-T-303 ►Recovery When removing refrigerant from a system, either for servicing or decommissioning, it is recommended good practice that all refrigerants are removed safely. When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that the correct number of cylinders for holding the total system charge are available.
  • Page 141 MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. 2-3, Marunouchi 3-chome, Chiyoda-ku, Tokyo, 100-8332, Japan http://www.mhi-mth.co.jp/en/ Because of our policy of continuous improvement, we reserve the right to make changes in all specifications without notice. Copyright MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.

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