Mitsubishi SRK20ZSX-W Technical Manual
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Mitsubishi SRK20ZSX-W Technical 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)
SRK20ZSX-W, -WB, -WT
SRK25ZSX-W, -WB, -WT
SRK35ZSX-W, -WB, -WT
SRK50ZSX-W, -WB, -WT
SRK60ZSX-W, -WB, -WT
Manual No.'18•SRK-T-234
updated May 22, 2018

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  • Page 1 Manual No.'18•SRK-T-234 updated May 22, 2018 TECHNICAL MANUAL INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS (Split system, air to air heat pump type) SRK20ZSX-W, -WB, -WT SRK25ZSX-W, -WB, -WT SRK35ZSX-W, -WB, -WT SRK50ZSX-W, -WB, -WT SRK60ZSX-W, -WB, -WT...

  • Page 3: Table Of Contents

    '18 • SRK-T-234 CONTENTS 1. SPECIFICATIONS ..................2. EXTERIOR DIMENSIONS ................. 18 (1) Indoor units ..................18 (2) Outdoor units ..................19 (3) Remote control ..................21 3. ELECTRICAL WIRING ................24 (1) Indoor units ..................24 (2) Outdoor units ..................
  • Page 4 '18 • SRK-T-234 (21) Protective control function ..............73 10. MAINTENANCE DATA ................. 81 (1) Cautions ....................81 (2) Items to check before troubleshooting ..........81 (3) Troubleshooting procedure (If the air-conditioner does not run at all) ..81 ......82 (4) Troubleshooting procedure (If the air-conditioner runs) (5) Self-diagnosis table ................

  • Page 5: Specifications

    '18 • SRK-T-234 1. SPECIFICATIONS 　　　　　 SRK20ZSX-W Model n i l y t i ) ) . y t i ) ) . Heating capacity (H2) － n i l r consumption Heating (H2) － n i l g current Operation 　　Max.　9...
  • Page 6 '18 • SRK-T-234 SRK25ZSX-W Model n i l y t i ) ) . y t i ) ) . Heating capacity (H2) － n i l r consumption Heating (H2) － n i l g current Operation 　　Max.　9 n i l data n i l Heating (H2)
  • Page 7 '18 • SRK-T-234 SRK35ZSX-W Model n i l y t i ) ) . y t i ) ) . Heating capacity (H2) － n i l r consumption Heating (H2) － n i l g current Operation 　　Max.　9 n i l data n i l Heating (H2)
  • Page 8 '18 • SRK-T-234 SRK50ZSX-W Model n i l y t i 5.0 ( 1.0(Min.) - 6.2 (Max.)) y t i 6.0 ( 0.8(Min.) - 8.2 (Max.)) Heating capacity (H2) － n i l 1.24 ( 0.19 - 1.90 ) r consumption 1.36 ( 0.20 - 2.46 ) Heating (H2) －...
  • Page 9 '18 • SRK-T-234 SRK60ZSX-W Model n i l y t i 6.1 ( 1.0(Min.) - 6.9 (Max.)) y t i 6.8 ( 0.8(Min.) - 8.8 (Max.)) Heating capacity (H2) － n i l 1.71 ( 0.19 - 2.50 ) r consumption 1.65 ( 0.20 - 2.86 ) Heating (H2) －...
  • Page 10 '18 • SRK-T-234 SRK20ZSX-WB Model n i l y t i ) ) . y t i ) ) . Heating capacity (H2) － n i l r consumption Heating (H2) － n i l g current Operation 　　Max.　9 n i l data n i l Heating (H2)
  • Page 11 '18 • SRK-T-234 SRK25ZSX-WB Model n i l y t i ) ) . y t i ) ) . Heating capacity (H2) － n i l r consumption Heating (H2) － n i l g current Operation 　　Max.　9 n i l data n i l Heating (H2)
  • Page 12 '18 • SRK-T-234 SRK35ZSX-WB Model n i l y t i ) ) . y t i ) ) . Heating capacity (H2) － n i l r consumption Heating (H2) － n i l g current Operation 　　Max.　9 n i l data n i l Heating (H2)
  • Page 13 '18 • SRK-T-234 Model SRK50ZSX-WB n i l y t i 5.0 ( 1.0(Min.) - 6.2 (Max.)) y t i 6.0 ( 0.8(Min.) - 8.2 (Max.)) Heating capacity (H2) － n i l 1.24 ( 0.19 - 1.90 ) r consumption 1.36 ( 0.20 - 2.46 ) Heating (H2) －...
  • Page 14 '18 • SRK-T-234 Model SRK60ZSX-WB n i l y t i 6.1 ( 1.0(Min.) - 6.9 (Max.)) y t i 6.8 ( 0.8(Min.) - 8.8 (Max.)) Heating capacity (H2) － n i l 1.71 ( 0.19 - 2.50 ) r consumption 1.65 ( 0.20 - 2.86 ) Heating (H2) －...
  • Page 15 '18 • SRK-T-234 SRK20ZSX-WT Model n i l y t i ) ) . y t i ) ) . Heating capacity (H2) － n i l r consumption Heating (H2) － n i l g current Operation 　　Max.　9 data n i l n i l Heating (H2)
  • Page 16 '18 • SRK-T-234 Model SRK25ZSX-WT n i l y t i ) ) . y t i ) ) . Heating capacity (H2) － n i l r consumption Heating (H2) － n i l g current Operation 　　Max.　9 n i l data n i l Heating (H2)
  • Page 17 '18 • SRK-T-234 SRK35ZSX-WT Model n i l y t i ) ) . y t i ) ) . Heating capacity (H2) － n i l r consumption Heating (H2) － n i l g current Operation 　　Max.　9 n i l data n i l Heating (H2)
  • Page 18 '18 • SRK-T-234 SRK50ZSX-WT Model n i l y t i 5.0 ( 1.0(Min.) - 6.2 (Max.)) y t i 6.0 ( 0.8(Min.) - 8.2 (Max.)) Heating capacity (H2) － n i l 1.24 ( 0.19 - 1.90 ) r consumption 1.36 ( 0.20 - 2.46 ) Heating (H2) －...
  • Page 19 '18 • SRK-T-234 Model SRK60ZSX-WT n i l y t i 6.1 ( 1.0(Min.) - 6.9 (Max.)) y t i 6.8 ( 0.8(Min.) - 8.8 (Max.)) Heating capacity (H2) － n i l 1.71 ( 0.19 - 2.50 ) r consumption 1.65 ( 0.20 - 2.86 ) Heating (H2) －...

  • Page 20: Exterior Dimensions

    '18 • SRK-T-234 2. EXTERIOR DIMENSIONS (1) Indoor units Models SRK20ZSX-W, 25ZSX-W, 35ZSX-W, 50ZSX-W, 60ZSX-W SRK20ZSX-WB, 25ZSX-WB, 35ZSX-WB, 50ZSX-WB, 60ZSX-WB SRK20ZSX-WT, 25ZSX-WT, 35ZSX-WT, 50ZSX-WT, 60ZSX-WT RLF000Z202...

  • Page 21: Outdoor Units

    '18 • SRK-T-234 (2) Outdoor units Models SRC20ZSX-W, 25ZSX-W, 35ZSX-W RCT000Z025...
  • Page 22 '18 • SRK-T-234 Models SRC50ZSX-W, 60ZSX-W RCT000Z026...

  • Page 23: Remote Control

    '18 • SRK-T-234 (3) Remote control (3) Remote control (a) Wireless remote control Unit : mm...
  • Page 24 '18 • SRK-T-234 (b) Wired remote control (option parts) Interface kit (SC-BIKN2-E) is required to use the wired remote control. Model RC-EX3 Installation space Dimensions (Viewed from front) Exterior appearance Pearl white (Munsell color) (N8.5) near equivalent R/C cable：0.3mm × 2 cores <...
  • Page 25 '18 • SRK-T-234 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 le etc. Exposed mounting In case of pulling out In case of pulling out from upper left from center 0.3mm...

  • Page 26: Electrical Wiring

    '18 • SRK-T-234 3. ELECTRICAL WIRING (1) Indoor units Models SRK20ZSX-W, 25ZSX-W, 35ZSX-W, 50ZSX-W, 60ZSX-W SRK20ZSX-WB, 25ZSX-WB, 35ZSX-WB, 50ZSX-WB, 60ZSX-WB SRK20ZSX-WT, 25ZSX-WT, 35ZSX-WT, 50ZSX-WT, 60ZSX-WT RWA000Z413...

  • Page 27: Outdoor Units

    '18 • SRK-T-234 (2) Outdoor units Models SRC20ZSX-W, 25ZSX-W, 35ZSX-W RWC000Z305...
  • Page 28 '18 • SRK-T-234 Models SRC50ZSX-W, 60ZSX-W RWC000Z306...

  • Page 29: Noise Level

    '18 • SRK-T-234 4. NOISE LEVEL (1) Sound power level Model SRK20ZSX-W, -WB, -WT Condition ISO5151 T1/H1 (Indoor Unit) MODE Rated capacity value (Hi) Model SRK20ZSX-W, -WB, -WT Cooling 53 dB(A) Noise Level Heating 55 dB(A) × ..Cooling, Heating 70.0...
  • Page 30 '18 • SRK-T-234 Model SRK25ZSX-W, -WB, -WT Condition ISO5151 T1/H1 (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...
  • Page 31 '18 • SRK-T-234 Model SRK35ZSX-W, -WB, -WT Condition ISO5151 T1/H1 (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...
  • Page 32 '18 • SRK-T-234 Model SRK50ZSX-W, -WB, -WT Condition ISO5151 T1/H1 (Indoor Unit) MODE Rated capacity value (Hi) Model SRK50ZSX-W, -WB, -WT Cooling 59 dB(A) Noise Level Heating 62 dB(A) × ..Cooling, Heating 70.0 60.0 50.0 40.0 30.0 20.0 10.0 1000 2000 4000...
  • Page 33 '18 • SRK-T-234 Model SRK60ZSX-W, -WB, -WT Condition ISO5151 T1/H1 (Indoor Unit) MODE Rated capacity value (Hi) Model SRK60ZSX-W, -WB, -WT Cooling 62 dB(A) Noise Level Heating 63 dB(A) × ..Cooling, Heating 70.0 60.0 50.0 40.0 30.0 20.0 10.0 1000 2000 4000...
  • Page 34 '18 • SRK-T-234 (2) Sound pressure level (a) Rated capacity value Model 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...
  • Page 35 '18 • SRK-T-234 Model SRK25ZSX-W, -WB, -WT Condition ISO5151 T1/H1 (Indoor Unit) MODE Rated capacity value (Hi) Model SRK25ZSX-W, -WB, -WT Cooling 39 dB(A) Noise Mike position 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...
  • Page 36 '18 • SRK-T-234 Model SRK35ZSX-W, -WB, -WT Condition ISO5151 T1/H1 (Indoor Unit) MODE Rated capacity value (Hi) Model SRK35ZSX-W, -WB, -WT Cooling 43 dB(A) Noise Mike position 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...
  • Page 37 '18 • SRK-T-234 Model SRK50ZSX-W, -WB, -WT Condition ISO5151 T1/H1 (Indoor Unit) MODE Rated capacity value (Hi) Model SRK50ZSX-W, -WB, -WT Cooling 44 dB(A) Noise Mike position Level Heating 47 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...
  • Page 38 '18 • SRK-T-234 Model SRK60ZSX-W, -WB, -WT Condition ISO5151 T1/H1 (Indoor Unit) MODE Rated capacity value (Hi) Model SRK60ZSX-W, -WB, -WT Cooling 48 dB(A) Noise Mike position Level Heating 47 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...
  • Page 39 '18 • SRK-T-234 (b) Each fan speed mode Condition ISO5151 T1/H1 (Indoor Unit) MODE Model SRK20ZSX-W, -WB, -WT Cooling 31 dB(A) Noise Mike position Level Heating 33 dB(A) 0.8m Unit Mike position (Center & low points) × ..Cooling, Heating...
  • Page 40 '18 • SRK-T-234 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...
  • Page 41 '18 • SRK-T-234 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 42 '18 • SRK-T-234 Condition ISO5151 T1/H1 (Indoor Unit) MODE Model SRK25ZSX-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 43 '18 • SRK-T-234 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 44 '18 • SRK-T-234 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 45 '18 • SRK-T-234 Condition ISO5151 T1/H1 (Indoor Unit) MODE Model SRK50ZSX-W, -WB, -WT Cooling 39 dB(A) Noise Mike position Level Heating 41 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 46 '18 • SRK-T-234 Condition ISO5151 T1/H1 (Indoor Unit) MODE Model SRK50ZSX-W, -WB, -WT Cooling 22 dB(A) Noise Mike position Level Heating 23 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 47 '18 • SRK-T-234 Condition ISO5151 T1/H1 (Indoor Unit) MODE Model SRK60ZSX-W, -WB, -WT Cooling 41 dB(A) Noise Mike position 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 1000 2000...
  • Page 48 '18 • SRK-T-234 Condition ISO5151 T1/H1 (Indoor Unit) MODE Model SRK60ZSX-W, -WB, -WT Cooling 22 dB(A) Noise Mike position Level Heating 23 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 49: Piping System

    '18 • SRK-T-234 5. PIPING SYSTEM Models SRK20ZSX-W, 25ZSX-W, 35ZSX-W SRK20ZSX-WB, 25ZSX-WB, 35ZSX-WB SRK20ZSX-WT, 25ZSX-WT, 35ZSX-WT Cooling cycle Heating cycle Indoor unit Outdoor unit Outdoor air Flare temp. sensor connection Service valve (TH3) (Gas) Muffler Gas pipe Muffler Discharge pipe...

  • Page 50: Range Of Usage & Limitations

    '18 • SRK-T-234 6. RANGE OF USAGE & LIMITATIONS Model SRK20, 25, 35ZSX-W SRK50, 60ZSX-W SRK20, 25, 35ZSX-WB SRK50, 60ZSX-WB SRK20, 25, 35ZSX-WT SRK50, 60ZSX-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 51 '09•SRK-DB-087D '18 • SRK-T-234 (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 52: Capacity Tables

    '18 • SRK-T-234 7. CAPACITY TABLES Model SRK20ZSX-W, -WB, -WT Cooling mode (kW) Heating mode (HC) (kW) Indoor air temperature Outdoor Indoor air temperature Outdoor 21˚CDB 23˚CDB 26˚CDB 27˚CDB 28˚CDB 31˚CDB 33˚CDB Air flow Air flow temperature 14˚CWB 16˚CWB 18˚CWB 19˚CWB...
  • Page 53 '18 • SRK-T-234 Model SRK50ZSX-W, -WB, -WT Cooling mode (kW) Heating mode (HC) (kW) Indoor air temperature Outdoor Indoor air temperature Outdoor 21˚CDB 23˚CDB 26˚CDB 27˚CDB 28˚CDB 31˚CDB 33˚CDB Air flow Air flow temperature 14˚CWB 16˚CWB 18˚CWB 19˚CWB 20˚CWB 22˚CWB 24˚CWB 16˚CDB 18˚CDB...

  • Page 54: Application Data

    '18 • SRK-T-234 8. APPLICATION DATA RLF012A202B Model SRK20,25,35,50,60ZSX (1) Installation of indoor unit R32/R410A REFRIGERANT USED • • This installation manual deals with an indoor unit installation only. For an outdoor unit installation, refer to page 56. • • This unit is designed for R32 or R410A. See a label on the outdoor unit to check refrigerant information. •...
  • Page 55 '18 • SRK-T-234 2. SELECTING INSTALLATION LOCATION After getting customer’s approval, select installation location according to following guidelines. 6.5 cm minimum from the ceiling (In the case of less than 10 cm, Installation example there is a possibility of performance 1.
  • Page 56 '18 • SRK-T-234 6. FORMING PIPING AND DRAIN HOSE 1. Forming piping Piping is possible in the right, rear, downward, left, left rear or left downward direction. Pipings Forming of pipings Taping of the exterior • Hold the bottom of the •...
  • Page 57 '18 • SRK-T-234 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 wireless remote control.

  • Page 58: Installation Of Outdoor Unit

    '18 • SRK-T-234 (2) Installation of outoor unit 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 52. SAFETY PRECAUTIONS • Before installation, read the “SAFETY PRECAUTIONS” carefully and strictly follow it during the installa- •...
  • Page 59 '18 • SRK-T-234 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 60 '18 • SRK-T-234 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 61 '18 • SRK-T-234 RWC012A063B 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 62: Safety Precautions In Handling Air-Conditioners With Flammable Refrigerants

    '18 • SRK-T-234 (3) Safety precautions in handling air-conditioners with flammable refrigerants RSA012A061 WALL TYPE AIR-CONDITIONER R32 REFRIGERANT USED This equipment uses flammable refrigerants. If the refrigerant There is information included in the user’s manual and/or is leaked, together with an external ignition source, there is a installation manual.
  • Page 63 '18 • SRK-T-234 CAUTION • For appliances containing flammable refrigerants, 6. Repair to intrinsically safe components 13. Labelling flushing shall be achieved by breaking the vacuum • Do not apply any permanent inductive or in the system with OFN and continuing to fill until •...
  • Page 64 '18 • SRK-T-234 • Transport of equipment containing flammable refrigerants Transportation regulations of each country must be complied. • Marking of equipment using signs Employers should ensure that employees receive suitable and sufficient instruction and training on the meaning of appropriate afety signs and the actions that need to be taken in connection with these signs.

  • Page 65: Outline Of Operation Control By Microcomputer

    '18 • SRK-T-234 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 66: Unit On/Off Button

    '09•SRK-DB-087D '18 • SRK-T-234 '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 67: Selection Of The Annual Cooling Function

    Jumpre wire (J1) '18 • SRK-T-234 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 68: Economy Operation

    '18 • SRK-T-234 (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 69: Auto Operation

      Wireless remote   Angle of flap from horizontal control display '18 • SRK-T-234 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 70: Timer Operation

    AUTO Air flow selection Air flow selection < = Operation mode Operation mode Room temp. – Setting temp. >5°C Room temp. – Setting temp. 5°C Cooling AUTO AUTO HIGH POWER AUTO < = < = Room temp. – Setting temp. >5°C Room temp.

  • Page 71: Silent Operation

    '09•SRK-DB-087D '09•SRK-DB-087D '18 • SRK-T-234 (11) Timer operation (a) Comfort start-up (ON timer operation) (11) Timer operation (12) Silent operation The unit starts the operation 5 to 60 minutes earlier so that the room can approach optimum temperature at ON timer. When the silent operation is set, the unit operates by dropping the outdoor fan speed and the compressor speed.

  • Page 72: Display Brightness Adjustment

    '18 • SRK-T-234 (15) Display brightness adjustment This function can be used when it is necessary to adjust the brightness of unit display. Brightness level Run light Timer light 100% 100% '09•SRK-DB-087D Note(1) When the unit displays self diagnosis or service mode, brightness level is always LV2. (16) AUTO OFF operation In order to prevent the air-conditioner from continuing to operate although the person(s) has already left the room, the air-conditioner automatically stops approximalely 1 hour (or 2 hours) after the sensor judges that there is no one in the room.
  • Page 73 In the case, indoor air temperature is detected by sensor on the wired remote control. (b) Details of control at each operation mode (pattern) (ii) Hot keep operation '18 • SRK-T-234 (i) Fuzzy operation During the heating operation, the indoor fan speed can be controlled based on the temperature of the indoor heat exchanger (Th2) to prevent blowing out of cold air.

  • Page 74: Outline Of Cooling Operation

    (ii) Contents of control Unit : °C Signal of wireless remote control (Display) '18 • SRK-T-234 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 75: Outline Of Automatic Operation

    12-50rps 12-58rps 12-74rps 12-86rps 12-110rps 12-34rps 12-38rps 12-54rps 12-70rps 12-90rps 12-30rps 12-34rps 12-42rps 12-50rps 12-66rps '18 • SRK-T-234 12-30rps 12-30rps 12-30rps 12-30rps 12-30rps (20) 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 76: Srk-T

    '18 • SRK-T-234 Model SRK50 SRK60 Item Upper limit of Range A:50rps, Range B:50rps, Range A:50rps, Range B:50rps, compressor's speed Range C:24rps Range C:24rps Range A:Adaptable to compressor speed Range A:Adaptable to compressor speed Indoor fan Range B, Range C:4th speed Range B, Range C:4th speed Upper limit of Range A:50rps, Range B:50rps,...
  • Page 77 Indoor heat exchanger limit (iii) Reset conditions temperature 5°C or lower 2.5°C or lower speed Item Lower limit of compressor command speed 0 rps '18 • SRK-T-234 Keep the fan speed before Indoor fan frost prevention control Indoor heat exchanger Depends on compressor speed Outdoor fan temperature (°C)
  • Page 78 '09•SRK-DB-087D '18 • SRK-T-234 (e) Cooling low outdoor air temperature protective control Operating conditions When the outdoor air temperature (models SRK20, 25, 35 : TH3 ; models SRK50, 60 : TH2) is 22°C or lower continues for 20 seconds while the compressor speed is other than 0 rps. (ii) Detail of operation It controls the upper and lower limit values for the compressor speed according to the following table.
  • Page 79 '18 • SRK-T-234 (g) Heating overload protective control Indoor fan speed Operating conditions When the outdoor air temperature (models SRK20, 25, 35 : TH3 ; models SRK50, 60 : TH2) is 17°C or higher continues for 30 seconds while the compressor speed other than 0 rps. Detail of operation The indoor fan speed is stepped up by 1 speed step.
  • Page 80 '18 • SRK-T-234 Compressor overheat protection Purpose (ii) Detail of operation (models SRK20, 25, 35 : TH4 ; models SRK50, 60 : TH3) (Example) Fuzzy 100(105) Discharge pipe temperature (˚C) 100 (105) - 100 (105) temperature 100 (105) Cooling Heating Lower limit speed 22 (25) rps 32 rps...
  • Page 81 '18 • SRK-T-234 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 (models SRK20, 25, 35 : TH3 ; models SRK50, 60 : TH2) Detail of operation Outdoor fan Outdoor air temperature >...
  • Page 82 '18 • SRK-T-234 Refrigeration cycle system protection Starting conditions When A minutes have elapsed after the compressor ON or the completion of the defrost operation Other than the defrost operation When, after satisfying the conditions of 1) and 2) above, the compressor speed, indoor air temperature (Th1) and indoor heat exchanger temperature (Th2) have satisfied the conditions in the following table for 5 minutes: Room temperature (Th1)/ Operation mode...

  • Page 83: Maintenance Data

    '18 • SRK-T-234 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 84: Troubleshooting Procedure (If The Air-Conditioner Runs)

    '09•SRK-DB-087D '18 • SRK-T-234 (4) Troubleshooting procedure (If the air-conditioner runs) service 84 - 90. service 84 - 90.

  • Page 85: Self-Diagnosis Table

    '09•SRK-DB-087D '18 • SRK-T-234 (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 86: Service Mode (Trouble Mode Access Function)

    '09•SRK-DB-087D '18 • SRK-T-234 (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 87 '09•SRK-DB-087D '18 • SRK-T-234 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 88 '09•SRK-DB-087D '18 • SRK-T-234 (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 89 '09•SRK-DB-087D '18 • SRK-T-234 (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 90 '09•SRK-DB-087D '18 • SRK-T-234 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 91 '09•SRK-DB-087D '18 • SRK-T-234 (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 92 '09•SRK-DB-087D '18 • SRK-T-234 (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 93 '09•SRK-DB-087D '18 • SRK-T-234 Service data record form Wireless r Operation mode Fan speed mode Wireless r Wireless r Wireless r Wireless r Wireless r wireless (Refer to page 85.)

  • Page 94: Inspection Procedures Corresponding To Detail Of Trouble

    '09•SRK-DB-087D '18 • SRK-T-234 (7) Inspection procedures corresponding to detail of trouble Sensor error Broken sensor wire, connector poor connection Discharge pipe sensor temperature characteristics Sensor temperature characteristics (Room temp., indoor heat exchanger temp., out- door heat exchanger temp., outdoor air temp.) - 10 Temperature (˚C)
  • Page 95 '09•SRK-DB-087D '18 • SRK-T-234 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. 102. ＊   ＊ SRC20-35 : 1.786Ω (U-V, V-W, U-W ) or more at 20ºC SRC50, 60 : 1.452Ω...
  • Page 96 '09•SRK-DB-087D '18 • SRK-T-234 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 97 '09•SRK-DB-087D '18 • SRK-T-234 Trouble of outdoor unit Insufficient refregerant amount, Faulty power transistor, Broken compressor wire Service valve close, Defective EEV, Defective outdoor PCB source source source source ◆  (1)      operation   Notes (1) 102. (2) Check coil wire resistance, see page 93. wire ．...
  • Page 98 '18 • SRK-T-234 Rotor lock Defective compressor, defective outdoor PCB See page 93. Service valve (gas side) closed operation Service valve (gas side) closed, (8) Phenomenon observed after shortcircuit, wire breakage on sensor Defective outdoor PCB (a) Indoor unit Phenomenon Operation Sensor mode...

  • Page 99: Phenomenon Observed After Shortcircuit, Wire Breakage On Sensor

    '18 • SRK-T-234 (8) Phenomenon observed after shortcircuit, wire breakage on sensor (a) Indoor unit Phenomenon Operation Sensor mode Shortcircuit Disconnected wire Cooling Room temperature sensor Heating Cooling Freezing cycle system protection trips and stops the compressor. Heat exchanger sensor Heating Cooling Humidity sensor...
  • Page 100 blocks ② and ③ oscillating between Replace indoor PCB. DC 0 and 20V? '18 • SRK-T-234 Indoor electrical components are normal. (b) Indoor unit fan motor check procedure 1) Indoor PCB output check ① ④ ⑤ (–) DC several V DC308-336V (4-6 V) Measuring...

  • Page 101: How To Make Sure Of Wireless Remote Control

    Operation SW ON Measure in this section '18 • SRK-T-234 (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 102: Outdoor Unit Inspection Points

    '18 • SRK-T-234 (12) Outdoor unit inspection points Models SRC20ZSX-W, 25ZSX-W, 35ZSX-W ◆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 103 '18 • SRK-T-234 Models SRC50ZSX-W, 60ZSX-W ◆Check point of outdoor unit CAUTION - HIGH VOLTAGE High voltage is produced in the control box. Don't touch ◆Power source and serial signal inspection electrical parts in the control box for 5 minutes after the : AC220/230/240V unit is stopped.
  • Page 104 '09•SRK-DB-087D '18 • SRK-T-234 (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          source ② Measuring Voltage range when point normal ⑥ ...

  • Page 105: Indoor Unit Disassembly Procedure

    '18 • SRK-T-234 11. INDOOR UNIT DISASSEMBLY PROCEDURE...
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  • Page 111: Option Parts

    '18 • SRK-T-234 12. OPTION PARTS (1) Wired remote control (a) Model RC-EX3 PJZ012A131 　 1 . Safety precautions s i h l a u y l l t r a g n i a t s t a l l n o i a t s t l l...
  • Page 112 '18 • SRK-T-234 　 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 113 '18 • SRK-T-234 　 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 ・Where the surface is not flat ・Where the strength of installation area is insufficient ) 2 (...
  • Page 114 '18 • SRK-T-234 　 2 . Accessories & Prepare on site Following parts are provided. Accessories R/C main unit, wood screw (Ф3.5 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 115 '18 • SRK-T-234 　 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) 固定穴 Fixing holes センサー 端子 Sensor USB port Terminal block To remove the upper case from the bottom cases of R/C ess at the lower part of R/C and twist it lightly to remove.
  • Page 116 ブッ シング パテで シール する こ と '18 • SRK-T-234 　 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 117 '18 • SRK-T-234 　 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 118 '18 • SRK-T-234 Installation manual for wired remote controller PJA012D730 Connect the remote control c (b) Model RC-E5 terminal block. Connect the terminal of remo Read together with indoor unit's installation manual. with the terminal of indoor un (X and Y are no polarity) WARNING Wiring route is as shown in th Fasten the wiring to the terminal securely and hold the cable securely so as not to apply unexpected stress on the...
  • Page 119 '18 • SRK-T-234 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 temperat Connect the terminal of remote control (X,Y) Upper case Upper case Board Board Heating : 16 ~ 30°C (55 ~ 86°F)
  • Page 120 '18 • SRK-T-234 PJA012D730 Sheath heath The range of temperature setting Upper When shipped, the range of set temperature differs depending on the operation mode as below. per 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 121 '18 • SRK-T-234 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 122 '18 • SRK-T-234 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 123 '18 • SRK-T-234 PJA0 12D 730 nd is automatically defined as following table. Operation message How to set function ectable indoor unit. Function description: Function No. Stop air-conditioner and press (SET) (MODE) setting description: uto-RUN" mode buttons at the same time for over three seconds, and the three step of air flow setting "FUNCTION SET "...
  • Page 124 '18 • SRK-T-234 '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-EX3 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 125 '18 • SRK-T-234 '17 • SRK-T-211 Setting ＆ display item Description RC-EX3 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] [Administrator password] [Energy-saving operation] [Timer] ○...
  • Page 126 '18 • SRK-T-234 Setting ＆ display item Description RC-EX3 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 127: Interface Kit (Sc-Bikn2-E)

    '18 • SRK-T-234 RKZ012A099 (2) Interface kit (SC-BIKN2-E) 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 128 '18 • SRK-T-234 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 129 '18 • SRK-T-234 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 130 '18 • SRK-T-234 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 suitch Caution:Wireless remote control attached to the indoor unit can be used in parallel, after connecting the wired remote control.

  • Page 131: Superlink E Board (Sc-Adna-E)

    '18 • SRK-T-234 (3) Superlink E board (SC-ADNA-E) WARING CAUTION...
  • Page 132 '18 • SRK-T-234...

  • Page 133: Technical Information

    1860 m3/h Contact details for obtaining Name and address of the manufacturer or of its authorised representative. more information Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. 5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET United Kingdom RWA000Z271...
  • Page 134 1860 m3/h Contact details for obtaining Name and address of the manufacturer or of its authorised representative. more information Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. 5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET United Kingdom RWA000Z271...
  • Page 135 2160 m3/h Contact details for obtaining Name and address of the manufacturer or of its authorised representative. more information Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. 5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET United Kingdom RWA000Z271...
  • Page 136 2340 variable m3/h Contact details for obtaining Name and address of the manufacturer or of its authorised representative. more information Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. 5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET United Kingdom RWA000Z271...
  • Page 137 2490 m3/h Contact details for obtaining Name and address of the manufacturer or of its authorised representative. more information Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. 5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET United Kingdom RWA000Z271...
  • Page 138 Rated air flow(outdoor) 1860 m3/h Contact details for obtaining Name and address of the manufacturer or of its authorised representative. more information Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. 5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET United Kingdom RWA000Z271...
  • Page 139 Rated air flow(outdoor) 1860 m3/h Contact details for obtaining Name and address of the manufacturer or of its authorised representative. more information Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. 5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET United Kingdom RWA000Z271...
  • Page 140 Rated air flow(outdoor) 2160 m3/h Contact details for obtaining Name and address of the manufacturer or of its authorised representative. more information Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. 5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET United Kingdom RWA000Z271...
  • Page 141 Rated air flow(outdoor) 2340 m3/h Contact details for obtaining Name and address of the manufacturer or of its authorised representative. more information Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. 5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET United Kingdom RWA000Z271...
  • Page 142 Rated air flow(outdoor) 2490 m3/h Contact details for obtaining Name and address of the manufacturer or of its authorised representative. more information Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. 5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET United Kingdom RWA000Z271...
  • Page 143 Rated air flow(outdoor) 1860 m3/h Contact details for obtaining Name and address of the manufacturer or of its authorised representative. more information Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. 5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET United Kingdom RWA000Z271...
  • Page 144 Rated air flow(outdoor) 1860 m3/h Contact details for obtaining Name and address of the manufacturer or of its authorised representative. more information Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. 5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET United Kingdom RWA000Z271...
  • Page 145 Rated air flow(outdoor) 2160 m3/h Contact details for obtaining Name and address of the manufacturer or of its authorised representative. more information Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. 5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET United Kingdom RWA000Z271...
  • Page 146 Rated air flow(outdoor) 2340 m3/h Contact details for obtaining Name and address of the manufacturer or of its authorised representative. more information Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. 5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET United Kingdom RWA000Z271...
  • Page 147 Rated air flow(outdoor) 2490 m3/h Contact details for obtaining Name and address of the manufacturer or of its authorised representative. more information Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. 5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET United Kingdom RWA000Z271...

  • Page 148: Reference

    '18 • SRK-T-234 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 149 '18 • SRK-T-234 Comparison of saturated vapour pressure 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 150 '18 • SRK-T-234 (2) Cautions for safety 2-1) Transport of equipment containing flammable refrigerants It is necessary to follow the applicable transport regulations during the transportation with respect to equipment containing flammable gas. 2-2) Marking of equipment using signs All required signs are to be maintained and employers should ensure that employees receive suitable and sufficient 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 151 '18 • SRK-T-234 (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 152 '18 • SRK-T-234 ►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 153 '18 • SRK-T-234 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 154 '18 • SRK-T-234 ►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 155 '18 • SRK-T-234 ►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 156 '18 • SRK-T-234 ►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 157 '18 • SRK-T-234 MEMO...
  • Page 158 MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. 16-5 Konan 2-chome, Minato-ku, Tokyo, 108-8215, 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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