Mitsubishi SRK21CNS-S6 Technical Manual
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Mitsubishi SRK21CNS-S6 Technical Manual

Split system, air cooled cooling only type
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Manual No.'14•SRK-T-164
RESIDENTIAL AIR-CONDITIONING
TECHNICAL MANUAL & PARTS LIST
WALL MOUNTED TYPE
RESIDENTIAL AIR-CONDITIONERS
(Split system, air cooled cooling only type)
SRK21CNS-S6
SRK26CNS-S6

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  • Page 1 Manual No.'14•SRK-T-164 RESIDENTIAL AIR-CONDITIONING TECHNICAL MANUAL & PARTS LIST WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS (Split system, air cooled cooling only type) SRK21CNS-S6 SRK26CNS-S6...
  • Page 3 '14•SRK-T-164 TECHNICAL MANUAL...

  • Page 4: Table Of Contents

    '14•SRK-T-164 CONTENTS 1. SPECIFICATIONS ..................2. EXTERIOR DIMENSIONS ................ (1) Indoor units ..................(2) Outdoor units ..................(3) Wireless remote control ..............10 3. ELECTRICAL WIRING ................11 (1) Indoor units ..................11 (2) Outdoor units ..................13 4. PIPING SYSTEM ..................

  • Page 5: How To Read The Model Name

    '14•SRK-T-164 ..43 .......... 44 ........45 ■How to read the model name Example: SRK 21 C NS-S6 Series code Cooling only type Product capacity Model name SRK : Wall mounted type SRC : Outdoor unit...

  • Page 6: Specifications

    '14•SRK-T-164 1. SPECIFICATIONS SRK21CNS-S6 Model Item Indoor unit SRK21CNS-S6 Outdoor unit SRC21CNS-S6 Cooling capacity (1) 5300 Power supply 1 Phase, 220-240V, 50Hz Power Cooling 1.46 consumption Running Cooling current Operation data (1) Inrush current Cooling 3.63 Sound level dB(A) Hi : 47 Me : 42 Lo : 39...
  • Page 7 '14•SRK-T-164 SRK26CNS-S6 Model Item Indoor unit SRK26CNS-S6 Outdoor unit SRC26CNS-S6 Cooling capacity (1) 7400 Power supply 1 Phase, 220-240V, 50Hz Power Cooling 2.065 consumption Running Cooling current Operation data (1) Inrush current 43.7 Cooling 3.58 Sound level dB(A) Hi : 50 Me : 46 Lo : 43 Noise Cooling level...

  • Page 8: Exterior Dimensions

    '14•SRK-T-164 2. EXTERIOR DIMENSIONS (1) Indoor units Model SRK21CNS-S6...
  • Page 9 '14•SRK-T-164 Model SRK26CNS-S6...

  • Page 10: Outdoor Units

    '14•SRK-T-164 (2) Outdoor units Model SRC21CNS-S6...
  • Page 11 '14•SRK-T-164 Model SRC26CNS-S6...

  • Page 12: Wireless Remote Control

    '14•SRK-T-164 (3) Wireless remote control Unit: mm Unit: mm 17.3 17.3...

  • Page 13: Electrical Wiring

    '14•SRK-T-164 3. ELECTRICAL WIRING (1) Indoor units Model SRK21CNS-S6 LOUVER DISPLAY MOTOR LEFT WIRELESS RECEIVER CNX1 BACK-UP SW LOUVER PRINTED MOTOR CIRCUIT RIGHT ROOM TEMP. BOARD SENSOR FLAP CNX2 MOTOR HEAT EXCHANGER SENSOR 1 HUMIDITY SENSOR INTERFACE KIT SC-BIKN VARISTOR...
  • Page 14 '14•SRK-T-164 Model SRK26CNS-S6 LOUVER DISPLAY MOTOR LEFT WIRELESS RECEIVER CNX1 BACK-UP SW LOUVER MOTOR PRINTED RIGHT CIRCUIT BOARD FLAP ROOM TEMP. MOTOR SENSOR CNX2 HEAT EXCHANGER SENSOR 1 HUMIDITY SENSOR INTERFACE KIT SC-BIKN VARISTOR WHITE BLACK FUSE WHITE 250V YELLOW 3.15A BLUE BLACK...

  • Page 15: Outdoor Units

    '14•SRK-T-164 (2) Outdoor units Model SRC21CNS-S6 MEANING OF SYMBOLS SYMBOL PARTS NAME SYMBOL COLOR SYMBOL COLOR COMPRESSOR MOTOR BLACK WHITE FAN MOTOR BLUE YELLOW/ ELECTRIC EXPANSION VALVE （COIL） Y/GN ORANGE GREEN HEAT EXCHANGER SENSOR OUTDOOR AIR TEMP . SENSOR DISCHARGE PIPE TEMP . SENSOR DIODE STACK RUNNING CAPACITOR FOR COMPRESSOR RUNNING CAPACITOR FOR FAN MOTOR...

  • Page 16: Piping System

    '14•SRK-T-164 4. PIPING SYSTEM Model SRK21CNS-S6 Cooling cycle Indoor unit Outdoor unit Outdoor air Flare connecting temp. sensor Service valve (Gas) Gas pipe Check joint ø 15.88 Humidity sensor Room temp. Heat Discharge pipe Heat sensor exchanger temp. sensor exchanger...

  • Page 17: Range Of Usage & Limitations

    '14•SRK-T-164 5. RANGE OF USAGE & LIMITATIONS Models All models Item Indoor return air temperature ( Upper, lower limits ) Refer to the selection chart Outdoor air temperature ( Upper, lower limits ) Refrigerant line ( one way ) length Max.
  • Page 18 '14•SRK-T-164 (2) Correction of cooling capacity in relation to one way length of refrigerant piping Piping length [m] Cooling 0.99 0.975 0.965 0.95 How to obtain the cooling capacity SRK21CNS-S6 5300 5168 SRK21CNS-S6...

  • Page 19: Application Data

    '14•SRK-T-164 6. APPLICATION DATA When install the unit, be sure to check whether the selection of installation place, power supply WALL TYPE AIR CONDITIONER specifications, usage limitation (piping length, height differences between indoor and outdoor R410A REFRIGERANT USED units, power supply voltage and etc.) and installation spaces. Safety precautions Read the “Safety precautions”...

  • Page 20: Safety Precautions

    '14•SRK-T-164 Safety precautions ❚ CAUTION • Carry out the electrical work for ground lead with care. Do not connect the ground lead to the gas line, water line, lightning conductor or telephone line’s ground lead. Incorrect grounding can cause unit faults such as electric shocks due to short-circuiting. •...

  • Page 21: Selection Of Installation Location

    '14•SRK-T-164 Standard accessories Necessary tools for the installation work (Installation kit) Q'ty Accessories for indoor unit Plus headed driver (Phillips screwdriver) Installation board Knife ① (Attached to the rear of the indoor unit) ② Wireless remote control Tape measure ③ Remote control holder Hammer Tapping screws...

  • Page 22: Installation Of Indoor Unit

    '14•SRK-T-164 Limitations for one way piping length and vertical height difference 21 Series Total one way piping length ( ) Max. 25 m Vertical height difference (h) Max. 15 m 26 Series Total one way piping length ( ) Max. 25 m Vertical height difference (h) Max.
  • Page 23 '14•SRK-T-164 Drilling of holes and fixture sleeve (Option parts) Drill a hole with 65 whole core drill Adjusting sleeve length Cut off the sleeve collar in case of drawing piping out to rear. Cut off the sleeve collar that can be Wall thickness seen from beneath + 1.5 cm...
  • Page 24 '14•SRK-T-164 21 Series 26 Series The screw of the service panel is tightened securely. Service panel Terminal block Terminal block Clamp Wiring Clamp ② ③ Shaping the pipe Taping of the exterior Pipe Drain hose • • Hold the bottom of the pipe and change its Tape only the portion that runs through the wall.
  • Page 25 '14•SRK-T-164 [Drain hose changing procedures] 1. Remove the drain hose. 2. Remove the drain cap. 3. Insert the drain cap. 4. Connect the drain hose. • Remove the screw and • Remove it with hand • Insert the drain cap which was removed at •...
  • Page 26 '14•SRK-T-164 Removal and installation of the front panel 21 Series ① Removing • Remove the air inlet panel. • Remove the 5 set screws. Set screws latch • Remove the 4 latches in the upper section. • Move the lower part of the panel forward and puch upwards to remove.

  • Page 27: Installation Of Outdoor Unit

    '14•SRK-T-164 Installation of outdoor unit ① Make sure that the unit is stable in installation. Fix the unit to stable base. ② When installing the unit at a higher place or where it could be toppled by strong winds, secure the unit firmly with foundation bolts, wire, etc.

  • Page 28: Air Purge

    '14•SRK-T-164 Air purge ① Tighten all flare nuts in the pipings both indoor and Compound pressure gauge outside wall so as not to cause leak. Pressure gauge Operation valve cap ② Connect operation valve, charge hose, manifold valve Gauge manifold Operation valve and vacuum pump as is illustrated right.

  • Page 29: Installation Of Remote Control Switch

    '14•SRK-T-164 Installation of remote control switch Mounting method of battery Fixing to pillar or wall • • Uncover the remote control switch, and mount the batter- Conventionally, operate the wireless remote control by ies [R03(AAA, Micro)×2 pieces] in the body regularly. holding in your hand.

  • Page 30: Outline Of Operation Control By Microcomputer

    '14•SRK-T-164 7. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Operation control function by remote control Remote control ◆ Operation section Unit indication section Unit display section 21 Series RUN light (green) • Illuminates during operation. • Blinks at the ‘CLEAN operation’. Unit ON/OFF button 3 sec.
  • Page 31 Illuminates during 3D AUTO operation. HI POWER light (green) TIMER light (yellow) Illuminates during TIMER operation. Illuminates during HIGH POWER operation. '14•SRK-T-164 26 Series TIMER HI POWER 3D AUTO ON/OFF Unit ON/OFF button In emergencies, this button can be used for RUN light (green) turning on/off the unit when remote control is not •...

  • Page 32: Auto Restart Function

    '14•SRK-T-164 Auto restart function Jumper wire (J170) (ii) (J170) Jumper wire (J171) (4) 　 Custom cord switching procedure (a) Modifying the indoor printed circuit board (J171) (b) Modifying the wireless remote control (ii)

  • Page 33: Flap And Louver Control

    '14•SRK-T-164 (5)　Flap and louver control (a) Flap (Flap stopped) (Swing) Angle of Flap from Horizontal Remote control display COOL , DRY, FAN Approx 5°(10°) Approx 15°(20°) Approx 30° Approx 45° Approx 60° Note (1) Values in ( ) are for the 26 Series. (b) Louver (Louver stopped) (Swing)

  • Page 34: Auto Operation

    '14•SRK-T-164 　 3D auto operation Air flow selection Operation mode AUTO < = Indoor temp. – Setting temp. >5°C Indoor temp. – Setting temp. 5°C Cooling HIGH POWER AUTO (ii) Cooling Flap Up/down Swing Wide (Fixed) Louver Cooling Flap Horizontal blowing (Fixed) Louver Left/right Swing Cooling...

  • Page 35: Installation Location Setting

    '14•SRK-T-164 (7)　Timer operation (a) Comfortable timer setting (ON timer) (b) Sleep timer operation (c) OFF timer operation (8)　Installation location setting (a) Setting If the air conditioning unit is running, press the ON/OFF button to stop. (ii) Press the AIR FLOW (UP/DOWN) button and the AIR FLOW (LEFT/RIGHT) button together for 5 seconds...

  • Page 36: Outline Of Automatic Operation

    '14•SRK-T-164 (9) Outline of cooling operation (a) Operation of major functional components in Cooling mode Cooling Thermostat ON Thermostat OFF Failure Compressor Indoor fan motor Outdoor fan motor (few minutes ON) (few minutes ON) (b) Fan speed switching Model All models Fan speed Auto Auto fan control...

  • Page 37: Protective Control Function

    '14•SRK-T-164 (11) Protective control function (a) Frost prevention for indoor heat exchanger (During cooling or dehumidifying) (i) Operating conditions Indoor heat exchanger temperature (Th2) is lower than 2.5ºC. 3 minutes elapsed after the start of operation. (ii) Detail of frost prevention operation Compressor Indoor fan Protects the fan tap just before frost prevention control.
  • Page 38 '14•SRK-T-164 Compressor overheat protection If the discharge pipe temperature (sensed by Th3) exceeds the set temperature value, the compressor stops. If the temperature is 95ºC or lower after a 3-minute delay, it starts again, but if this function is reactivated again within 60 minutes, it results in an abnormal stop. (RUN light : ON, TIMER light : 5-time flash) Operation possible Abnormal stop...

  • Page 39: Maintenance Data

    '14•SRK-T-164 8. MAINTENANCE DATA (1) Cautions (a) If you are disassembling and checking an air conditioner, be sure to turn off the power before beginning. When work- ing on indoor units, let the unit sit for about  minute after turning off the power before you begin work. When work- ing on an outdoor unit, there may be an electrical charge applied to the main circuit (electrolytic condenser), so begin work only after discharging this electrical charge (to DC 0 V or lower).
  • Page 40 '14•SRK-T-164 (4) Troubleshooting procedure (If the air conditioner runs)
  • Page 41 '14•SRK-T-164 (5) Self-diagnosis table Indoor unit display panel Description Cause Display (flashing) condition TIMER of trouble light light • Broken heat exchanger sensor When a heat exchanger sensor 1 wire disconnection is detected while 1-time operation is stopped. (If a temperature of –28ºC or lower is detected for Heat exchanger 1 wire, poor connector sensor 1 error...

  • Page 42: Inspection Procedures Corresponding To Detail Of Trouble

    '14•SRK-T-164 (6) Inspection procedures corresponding to detail of trouble Sensor error [Broken sensor wire, connector poor connection] Is connector connection good? Correct connection. Is sensor resistance value good? Replace sensor. Replace PCB. ◆ Sensor temperature characteristics ◆ Discharge pipe sensor temperature characteristics (Room temp., indoor heat exchanger temp., outdoor heat exchanger temp., outdoor air temp.)
  • Page 43 '09•SRK-DB-087D '14•SRK-T-164 Over heat of compressor Gas shortage, defective discharge pipe sensor main Error of signal transmission Wiring error including power cable, defective indoor/ outdoor PCB ② ③ indoor ② ③ indoor ① ② outdoor sub...
  • Page 44 '14•SRK-T-164 Trouble of outdoor unit Insufficient refrigerant amount, Faulty power transistor, Broken compressor wire Service valve close, Defective EEV, Defective outdoor PCB ◆ Does 52X1 relay operate properly?   main ．...
  • Page 45 '14•SRK-T-164 See pages 53. (7) Phenomenon observed after shortcircuit, wire breakage on sensor (a) Indoor unit Phenomenon Operation Sensor mode Shortcircuit Disconnected wire Room temperature Cooling sensor Heat exchanger Cooling sensor Humidity sensor Cooling ■ Humidity sensor operation Failure mode Control input circuit resding Air conditioning system operation ①...
  • Page 46 Heat exchanger Cooling sensor Ourdoor air Cooling '14•SRK-T-164 temperature sensor Discharge pipe All modes Compressor stop. sensor (8) Checking the indoor electrical equipment (a) Indoor PCB check procedure Is there voltage between terminal Inspect power source blocks ① and ② ? (AC 220V) for outdoor unit.
  • Page 47 Operation SW ON Measure in this section '14•SRK-T-164 (9) How to make sure of wireless remote control Replace the display of indoor unit. indoor unit reset (ACL) button The figare below shows the SRK series.
  • Page 48 '14•SRK-T-164...

  • Page 49: Parts List

    '14•SRK-T-164 PARTS LIST TECHNICAL MANUAL INDOOR UNIT SRK21CNS-S6 SRK26CNS-S6 OUTDOOR UNIT SRC21CNS-S6 SRC26CNS-S6...
  • Page 50 '14•SRK-T-164 PANEL & FAN ASSY 17 16 CRAE0288...
  • Page 51 '14•SRK-T-164 SRK21CNS-S6 END ITEM NO. : RMA002F062AH Recommendable Purchased Q'ty Part No. Part Name RE.Q Note 100 500 1000 1 7 RMA 102A 101C PANEL ASSY,FRONT 1 RKY 122A 002B PANEL ASSY,FRONT 2 RKY 435A 003 GRILLE,AIR IN(TOP) 3 RMA 435A 010D PANEL ASSY,AIR IN...
  • Page 52 '14•SRK-T-164 SRK21CNS-S6 END ITEM NO. : RMA002F062AH Recommendable Purchased Q'ty Part No. Part Name Note RE.Q 100 500 1000 38 40 RKY 129A 023B FILTER UNIT ASSY 38 RKY 129A 036 HOLDER ASSY(B) 39 RKY 129A 025 HOLDER,FILTER(R) 40 RKY 129A 028...
  • Page 53 '14•SRK-T-164 MEMO...
  • Page 54 '14•SRK-T-164 HEAT EXCH. & CONTROL CRAE0289...
  • Page 55 '14•SRK-T-164 SRK21CNS-S6 END ITEM NO. : RMA002F062AH Recommendable Purchased Q'ty Part No. Part Name Note RE.Q 100 500 1000 1 10 RMA 301A 012 HEAT EXCH ASSY(AIR) 2 RMA 315D 008 HEADER ASSY 3 RKY 129A 035 BRACKET ASSY(L) 4 10 RKY 315A 002...
  • Page 56 '14•SRK-T-164 PANEL & FAN ASSY CRAE0240...
  • Page 57 '14•SRK-T-164 SRK26CNS-S6 END ITEM NO. : RMA002F063AH Recommendable Purchased Q'ty Part No. Part Name Note RE.Q 100 500 1000 1 6 RKW 102A 400H PANEL ASSY,FRONT 1 RKW 122A 400C PANEL,FRONT 2 RKW 435A 401F PANEL ASSY,AIR IN 3 RKW 437A 400 FILTER,AIR 3 W458.5×H345.3(t2) 4 RKW 129A 214A CAP...
  • Page 58 '14•SRK-T-164 SRK26CNS-S6 END ITEM NO. : RMA002F063AH Recommendable Purchased Q'ty Part No. Part Name Note RE.Q 100 500 1000 38 RKW 032A 200A PLATE,INSTALLATION 39 PHA 129A 302A COVER ASSY(PIPE) 40 RKW 132A 400 LID(R) 41 RKW 132A 401 LID(L) 42 43 RKW 132A 403 LID ASSY(TERMINAL) 43 RSA 011H 027...
  • Page 59 '14•SRK-T-164 MEMO...
  • Page 60 '14•SRK-T-164 HEAT EXCH. & CONTROL CRAE0290...
  • Page 61 '14•SRK-T-164 SRK26CNS-S6 END ITEM NO. : RMA002F063AH Recommendable Purchased Q'ty Part No. Part Name Note RE.Q 100 500 1000 1 10 RMA 301A 008 HEAT EXCH ASSY(AIR) 2 RMA 315D 003 HEADER ASSY 3 RKW 129A 410 BRACKET ASSY(L) 4 10 RMA 315A 006 DISTRIBUTOR ASSY 4 RSA 315A 005 DISTRIBUTOR...
  • Page 62 '14•SRK-T-164 PANEL & FAN ASSY CRBE0393...
  • Page 63 '14•SRK-T-164 SRC21CNS-S6 END ITEM NO. : RMC003F062AH Recommendable Purchased Q'ty Part NO. Part Name Note RE.Q 100 500 1000 1 RWC 122A 004A PANEL ASSY,FRONT 2 RWC 123A 005F PANEL ASSY,SIDE(R) 3 RWC 123A 008 PANEL,SIDE(L) 4 RWC 124A 004 PANEL ASSY,TOP 5 RWC 132A 007 PANEL ASSY,SERVICE...
  • Page 64 '14•SRK-T-164 HEAT EXCH. & CONTROL (TH1) 21 24 (TH2) (LIQ.) (TH3) 21 25 15 16 17 (GAS) CRBE0394 CONTROL ASSY...
  • Page 65 '14•SRK-T-164 SRC21CNS-S6 END ITEM NO. : RMC003F062AH Recommendable Purchased Q'ty Part NO. Part Name Note RE.Q 100 500 1000 1 RMC 301A 009A HEAT EXCH ASSY(AIR) 2 RCK 116A 002 BRACKET(VALVE) 3 RCP 381A 001A VALVE,SERVICE(1/4") 2 LIQ. 4 RWC 381A 017 VALVE,SERVICE(5/8") 2 GAS 5 7 RWC 304A 137...
  • Page 66 '14•SRK-T-164 PANEL & FAN ASSY CRBE0395...
  • Page 67 '14•SRK-T-164 SRC26CNS-S6 END ITEM NO. : RMC003F063AH Recommendable Purchased Q'ty Part NO. Part Name Note RE.Q 100 500 1000 1 RCR 122A 001 PANEL ASSY,FRONT 2 3 RCR 125A 002G PANEL ASSY,REAR 3 SSA 944B 031A HANDLE 4 RCR 124A 002M PANEL ASSY,TOP 5 6 RCR 122A 004A PANEL ASSY,SERVICE 5 RCR 122A 006B PANEL,SERVICE 6 SSA 944B 031A HANDLE...
  • Page 68 '14•SRK-T-164 HEAT EXCH. & CONTROL (TH2) (TH3) 22 26 (TH1) 22 25 (LIQ.) 17 18 19 (GAS) CRBE0396 CONTROL ASSY...
  • Page 69 '14•SRK-T-164 SRC26CNS-S6 END ITEM NO. : RMC003F063AH Recommendable Purchased Q'ty Part NO. Part Name Note RE.Q 100 500 1000 1 RMC 301A 041 HEAT EXCH ASSY(AIR) 2 RCR 116A 003 BRACKET(VALVE) 3 RCR 381A 003B VALVE,SERVICE(1/4") 2 LIQ. 4 RCR 381A 004 VALVE,SERVICE(5/8") 2 GAS 5 7 RMC 304A 025...
  • Page 70 RESIDENTIAL AIR-CONDITIONING TECHNICAL MANUAL & PARTS LIST Because of our policy of continuous improvement, we reserve the right to make changes in all specifications without notice. Copyright MITSUBISHI HEAVY INDUSTRIES, LTD.

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