Mitsubishi Heavy Industries SRK20ZMX-S Technical Manual
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Mitsubishi Heavy Industries SRK20ZMX-S Technical Manual

Mitsubishi Heavy Industries SRK20ZMX-S 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)
SRK20ZMX-S
25ZMX-S
35ZMX-S
50ZMX-S
60ZMX-S
Manual No.'13 SRK-T-144

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  • Page 1 Manual No.'13 SRK-T-144 TECHNICAL MANUAL INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS (Split system, air to air heat pump type) SRK20ZMX-S 25ZMX-S 35ZMX-S 50ZMX-S 60ZMX-S...

  • Page 2: Exterior Dimensions

    '13 • SRK-T-144 CONTENTS 1. SPECIFICATIONS ..................2. EXTERIOR DIMENSIONS ................. (1) Indoor units ..................(2) Outdoor units .................................... 11 3. ELECTRICAL WIRING ................13 (1) Indoor units ..................13 (2) Outdoor units ..................14 4. NOISE LEVEL .................... 16 5.

  • Page 3: Maintenance Data

    '13 • SRK-T-144 10. MAINTENANCE DATA ................63 (1) Cautions ..................... 63 (2) Items to check before troubleshooting ..........63 ..63 (3) Troubleshooting procedure (If the air conditioner does not run at all) ..... 64 (4) Troubleshooting procedure (If the air conditioner runs) (5) Self-diagnosis table ................

  • Page 4: Specifications

    '13 • SRK-T-144 1. SPECIFICATIONS SRK20ZMX-S Model Indoor unit SRK20ZMX-S Outdoor unit SRC20ZMX-S Item Power source Single phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 2.0 ( 0.9 (Min.) - 3.1 (Max.)) Nominal heating capacity (range) 2.5 ( 0.9 (Min.) - 4.3 (Max.)) Cooling 0.35 ( 0.19 - 0.70 )
  • Page 5 '13 • SRK-T-144 SRK25ZMX-S Model Item Indoor unit SRK25ZMX-S Outdoor unit SRC25ZMX-S Power source Single phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 2.55 ( 0.9 (Min.) - 3.2 (Max.)) Nominal heating capacity (range) 3.13 ( 0.9 (Min.) - 4.7 (Max.)) Cooling 0.49 ( 0.19 - 0.82 ) Power...
  • Page 6 '13 • SRK-T-144 SRK35ZMX-S Model Indoor unit SRK35ZMX-S Outdoor unit SRC35ZMX-S Item Power source Single phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 3.5 ( 0.9 (Min.) - 4.1 (Max.)) Nominal heating capacity (range) 4.3 ( 0.9 (Min.) - 5.1 (Max.)) Cooling 0.845 ( 0.19 - 1.01 ) Power...
  • Page 7 '13 • SRK-T-144 SRK50ZMX-S Model Item Indoor unit SRK50ZMX-S Outdoor unit SRC50ZMX-S Power source Single phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 5.0 ( 1.1 (Min.) - 5.8 (Max.)) Nominal heating capacity (range) 6.0 ( 0.6 (Min.) - 7.7 (Max.)) Cooling 1.30 ( 0.2 - 1.80 ) Power...
  • Page 8 '13 • SRK-T-144 SRK60ZMX-S Model Indoor unit SRK60ZMX-S Outdoor unit SRC60ZMX-S Item Power source Single phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 6.1 ( 1.1 (Min.) - 6.8 (Max.)) Nominal heating capacity (range) 6.8 ( 0.6 (Min.) - 8.2 (Max.)) Cooling 1.87 ( 0.2 - 2.50 ) Power...
  • Page 9 881.9 Symbol Content 59.9 59.9 20.9 Model 20,25,35 φ9.52（3／8"）（Flare） Gas piping Model 50,60 φ12.7（1／2"）（Flare） Liquid piping φ6.35（1／4"）（Flare） Hole on wall for right rear piping （φ65） Hole on wall for left rear piping （φ65） Drain hose VP16 Outlet for wiring Outlet for piping（on both side） Wireless remote control Outlet for down piping Terminal block...
  • Page 10 Notes Symbol Content （1） It must not be surrounded by walls on the four sides. 　（2） The unit must be fixed with anchor bolts. An anchor bolt must not Service valve connection（gas side） φ9.52（3／8"）（Flare） protrude more than 15mm. Service valve connection（liquid side） φ6.35（1／4"）（Flare） 　（3）...
  • Page 11 Notes Symbol Content （1） It must not be surrounded by walls on the four sides. 　（2） The unit must be fixed with anchor bolts. An anchor bolt must not Service valve connection（gas side） φ12.7（1／2"）（Flare） protrude more than 15mm. Service valve connection（liquid side） φ6.35（1／4"）（Flare）...
  • Page 12 '13 • SRK-T-144 (3) Remote control (a) Wireless remote control Unit : mm...

  • Page 13: Wiring Specifications

    '13 • SRK-T-144 (b) Wired remote control (option parts) Interface kit (SC-BIKN-E) is required to use the wired remote control. Wiring outlet Cut off the upper thin part of remote control lower case with a nipper or knife, and grind burrs with a file etc. Exposed mounting In case of pulling out In case of pulling out...
  • Page 14 Item Description CNE-CNY Connector Fan motor DISPLAY Flap motor PRINTED WIRELESS RECEIVER CNX1 CIRCUIT Louver motor BACK-UP SW BOARD Inlet motor Room temp. sensor Heat exch. sensor Humidity sensor (50, 60 only) CNX2 Limit switch Diode stack Fuse Terminal block Varistor INTERFACE KIT SC-BIKN-E...

  • Page 15: To Indoor Unit

    TO INDOOR UNIT POWER WIRES SIGNAL WIRE PCB ASSY PWB1 TERMINAL POWER SOURCE POWER BLOCK TRANSISTOR 〜220ｰ240V 50Hz 250V 15A （BK） （BK）R.IN （RD） 250V 20A （WH） NOISE （WH） 3～ S.IN FILTER （BK） （Y／G） （RD） C-2 SWITCHING F3 250V 1A 250V 3.15A POWER CIRCUIT CIRCUIT...
  • Page 16 POWER SOURCE ～220-240V 50Hz TERMINAL PCB ASSY （MAIN） PCB ASSY （SUB） BLOCK POWER TRANSISTOR FUSE （BK） （BK） （RD） （BK） 250V 20A （WH） ACTIVE 250V 20A 250V 20A （WH） （WH） FILTER 3～ （Y／G） （BR） （BK） UNIT （WH） （BK） TERMINAL CNMAIN CNSUB （Y／G）...

  • Page 17: Noise Level

    '13 • SRK-T-144 4. NOISE LEVEL Model SRK20ZMX-S Condition ISO-T1,JIS C 9612 (Indoor Unit) Mike position Model SRK20ZMX-S Noise Cooling 39 dB(A) 0.8m Unit Level Heating 38 dB(A) Mike position (Center & Low points) × ..Cooling, Heating N 7 0...
  • Page 18 '13 • SRK-T-144 Model SRK25ZMX-S Condition ISO-T1,JIS C 9612 (Indoor Unit) Mike position Model SRK25ZMX-S Cooling 41 dB(A) Noise 0.8m Level Heating 41 dB(A) Unit Mike position (Center & Low points) × ..Cooling, Heating N 7 0 N 6 0 Mike position: at highest noise level in position as mentioned below Distance from front side 1m N 5 0...
  • Page 19 '13 • SRK-T-144 Model SRK35ZMX-S Condition ISO-T1,JIS C 9612 (Indoor Unit) Mike position Model SRK35ZMX-S Cooling 43 dB(A) Noise 0.8m Level Heating 42 dB(A) Unit Mike position (Center & Low points) × ..Cooling, Heating N7 0 N6 0 Mike position: at highest noise level in position as mentioned below Distance from front side 1m N5 0 N4 0...
  • Page 20 '13 • SRK-T-144 Model SRK50ZMX-S Condition ISO-T1, JIS C 9612 (Indoor Unit) Mike position Model SRK50ZMX-S Cooling 47 dB(A) Noise 0.8m Level Heating 48 dB(A) Unit Mike position (Center & Low points) × ..Cooling, Heating N 7 0 N 6 0 Mike position: at highest noise level in position as mentioned below Distance from front side 1m N 5 0...
  • Page 21 '13 • SRK-T-144 Model SRK60ZMX-S Condition ISO-T1, JIS C 9612 (Indoor Unit) Mike position Model SRK60ZMX-S Cooling 51 dB(A) Noise 0.8m Level Heating 48 dB(A) Unit Mike position (Center & Low points) × ..Cooling, Heating N 7 0 N 6 0 Mike position: at highest noise level in position as mentioned below Distance from front side 1m N5 0...
  • Page 22 '13 • SRK-T-144 Models SRK20ZJX-S, 25ZJX-S, 35ZJX-S 5. PIPING SYSTEM Models SRK20ZMX-S, 25ZMX-S, 35ZMX-S Cooling cycle Heating cycle Indoor unit Outdoor unit Outdoor air Flare temp. sensor connection Service valve (TH2) (Gas) Discharge pipe temp. sensor Gas pipe Check joint...

  • Page 23: Selection Chart

    '13 • SRK-T-144 6. RANGE OF USAGE & LIMITATIONS RANGE OF USAGE & LIMITATIONS Models SRK50ZMX-S SRK20,25,35ZMX-S SRK60ZMX-S Item Cooling operation : Approximately 18 to 32℃ D.B. Indoor return air temperature Heating operation : Approximately 10 to 30℃ D.B. (Upper, lower limits) (Refer to the selection chart) Cooling operation : Approximately -15 to 46℃...

  • Page 24: Correction Of Cooling And Heating Capacity In Relation To One Way Length Of Refrigerant Piping

    '09•SRK-DB-087D '13 • SRK-T-144 (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 25: Capacity Tables

    '13 • SRK-T-144 7. CAPACITY TABLES Model SRK20ZMX-S Cooling Mode (kW) Heating Mode (HC) (kW) Indoor air temp indoor air temp outdoor 21˚CDB 23˚CDB 26˚CDB 27˚CDB 28˚CDB 31˚CDB 33˚CDB Air flow Outdoor air temp. Air flow air temp. 14˚CWB 16˚CWB 18˚CWB...
  • Page 26 '13 • SRK-T-144 Model SRK50ZMX-S Cooling Mode (kW) Heating Mode (HC) (kW) Indoor air temperature Indoor air temperature Outdoor Outdoor air temp. 18˚CDB 21˚CDB 23˚CDB 26˚CDB 27˚CDB 28˚CDB 31˚CDB 33˚CDB Air flow ˚CDB air temp. Air flow 12˚CWB 14˚CWB 16˚CWB 18˚CWB 19˚CWB 20˚CWB...

  • Page 27: Application Data

    Do not vent R410A into the atmosphere : R410A is a fluorinated Do not perform any change of protective device itself or its setup Models SRK20ZMX-S, 25ZMX-S, 35ZMX-S, 50ZMX-S, 60ZMX-S greenhouse gas, covered by the Kyoto Protocol with Groval condition.

  • Page 28: Before Installation

    BEFORE INSTALLATION SELECTION OF INSTALLATION LOCATION ○ Before installation check that the power supply matches the air conditioner. (Install at location that meets the following conditions, after getting approval from the customer) 7.0 cm minimum from the ceiling Indoor unit Standard accessories (Installation kit) ○...

  • Page 29: Connection Of Refrigerant Pipings

    RKY012A011 Fixing of indoor unit Since this air conditioner has been designed to collect dew drops on the rear Gutter surface to the drain pan, do not attach the power cord above the gutter. • How to remove the indoor unit from the installation board Indoor unitI Installation Steps Wall...
  • Page 30 ELECTRICAL WIRING WORK The screw of the service panel is tightened securely. Installing the air-cleaning filters 1. Open the air inlet panel and remove the air filters. Preparation of indoor unit CAUTION 2. Install the air-cleaning filter in the filter holders, and then install the filter holders in the air conditioner. Service panel •...

  • Page 31: Installation Of Outdoor Unit

    (2) Installation of outdoor unit RWC012A037 Models SRC20ZMX-S, 25ZMX-S, 35ZMX-S INSTALLATION MANUAL FOR OUTDOOR UNIT SRC20·25·35·50 Model DXC09·12·18 R410A REFRIGERANT USED This installation manual deals with outdoor units and general installation specifications only. For indoor units, refer to page 26. When install the unit, be sure to check whether the selection of installation place, power supply specifications, usage limitation (piping length, height differences between indoor and outdoor units, power supply voltage and etc.) and installation spaces.
  • Page 32 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 33: Haulage And Installation

    1. HAULAGE AND INSTALLATION (Take particular care in carrying in or moving the unit, and always perform such an operation with two or more persons.) When a unit is hoisted with slings for haulage, take into consideration the offset of its gravity center position. CAUTION If not properly balanced, the unit can be thrown off-balance and fall.

  • Page 34: Refrigerant Piping Work

    2. REFRIGERANT PIPING WORK 1) Restrictions on unit installation and use • Check the following points in light of the indoor unit specifications and the installation site. • Observe the following restrictions on unit installation and use. Improper installation can result in a compressor failure or performance degradation. •...
  • Page 35 5) Air tightness test Gas side Although outdoor and indoor units themselves have been tested for air tightness at the factory, check the connecting pipes after the installation work for air tightness from the service service valve valve’s check joint equipped on the outdoor unit side. While conducting a test, keep the service valve shut all the time. Outdoor unit Check joint Indoor unit...

  • Page 36: Drain Piping Work

    3. DRAIN PIPING WORK Model SRC20 ~ 35/DXC09,12 Model SRC50/DXC18 • Execute drain piping by using a drain elbow and drain CAUTION • When condensed water needs to be led to a drain, etc., install grommets supplied separately as accessories, where the unit on a flat base (supplied separately as an optional part) water drained from the outdoor unit is a problem.
  • Page 37 Power cable, indoor - outdoor connecting wire circuit diagram Model SRC20 ~ 35ZM-S Model SRC20 ~ 35ZMA-S Power supply terminal block Model SRC20 ~ 35ZMX-S Model SRC20 ~ 35ZMXA-S Model DXC09,12ZMA-S Cable clamp • It holds cables in place and protect the terminal connection from external force.

  • Page 38: After Installation

    5. UTILIZATION OF EXISTING PIPING <Table of pipe size restrictions> Check whether an existing pipe system is reusable or not by using the following flow chart. ◎: Standard pipe size START Additional charge volume per meter of pipe 0.02kg/m Liquid pipe ø6.35 Please consult with our distributor in the area, Are an outdoor unit and an indoor unit connected to the...

  • Page 39: Warning And Caution

    RWC012A038 INSTALLATION MANUAL FOR OUTDOOR UNIT Models SRC50ZMX-S, 60ZMX-S Model 40·50·60 R410A REFRIGERANT USED This installation manual deals with outdoor units and general installation specifications only. For indoor units, refer to page 26. When install the unit, be sure to check whether the selection of installation place, power supply specifications, usage limitation (piping length, height differences between indoor and outdoor units, power supply voltage and etc.) and installation spaces.
  • Page 40 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 41 1. HAULAGE AND INSTALLATION (Take particular care in carrying in or moving the unit, and always perform such an operation with two or more persons.) When a unit is hoisted with slings for haulage, take into consideration the offset of its gravity center position. CAUTION If not properly balanced, the unit can be thrown off-balance and fall.
  • Page 42 2. REFRIGERANT PIPING WORK 1) Restrictions on unit installation and use Check the following points in light of the indoor unit specifications and the installation site. Observe the following restrictions on unit installation and use. Improper installation can result in a compressor failure or performance degradation. Indoor unit Marks appearing in the Restrictions...
  • Page 43 5) Air tightness test Gas side Although outdoor and indoor units themselves have been tested for air tightness at the factory, check the connecting pipes after the installation work for air tightness from the service service valve valve’s check joint equipped on the outdoor unit side. While conducting a test, keep the service valve shut all the time. Outdoor unit Check joint Indoor unit...
  • Page 44 3. DRAIN PIPING WORK Execute drain piping by using a drain elbow and drain grommets When condensed water needs to be led to a drain, etc., install the unit supplied separately as accessories, where water drained from on a flat base (supplied separately as an optional part) or concrete CAUTION the outdoor unit is a problem.
  • Page 45 Power cable, indoor - outdoor connecting wire circuit diagram Power supply terminal block Model SRC-ZMX-S Model SRC-ZMXA-S Cable clamp • It holds cables in place and protect the terminal connection from external force. • This clamp is for the cable in the outside diameter 9 15mm.
  • Page 46 5. UTILIZATION OF EXISTING PIPING <Table of pipe size restrictions> Check whether an existing pipe system is reusable or not by using the following flow chart. ◎: Standard pipe size ○: Usable △: Restricted to shorter pipe length limits START Additional charge volume per meter of pipe 0.02kg/m 0.06kg/m...

  • Page 47: Outline Of Operation Control By Microcomputer

    '13 • SRK-T-144 9. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Operation control function by wireless remote control Operation section Transmission section OPERATION MODE select button ON/OFF (luminous) button Each time the button is pressed, the mode changes. Press to start operation, press again to stop.

  • Page 48: Unit On/Off Button

    '13 • SRK-T-144 (2) Unit ON/OFF button When the wireless remote control batteries become weak, or if the wireless remote control is lost or malfunctioning, this button may be used to turn the unit on and off. Operation Push the button once to place the unit in the automatic mode. Push it once more to turn the unit off. Details of operation The unit will go into the automatic mode in which it automatically determines, from indoor temperature (as detected by sensor), whether to go into the cooling, thermal dry or heating modes.

  • Page 49: Selection Of The Annual Cooling Function

    '13 • SRK-T-144 (5) Selection of the annual cooling function (a) The annual cooling function can be enabled or disabled by means of the jumper wire (J172) on the indoor unit PCB and the dip switch (SW2-4) on the interface kit (option) PCB. Interface kit Jumper wire (SC-BIKN-E)

  • Page 50: Flap And Louver Control

    '13 • SRK-T-144 (8) Flap and louver control   Control the flap and louver by AIRFLOW (UP/DOWN) and (LEFT/RIGHT) button on the wireless remote control.   Flap   Each time when you press the AIRFLOW (UP/DOWN) button the mode changes as follows. (Flap stopped) (Swing)  ...

  • Page 51: High Power

    '13 • SRK-T-144 (9) 3D auto operation Control the flap and louver by 3D AUTO button on the wireless remote control. Air flow selection and air flow direction are automatically controlled, allowing the entire indoor to efficiently conditioned. During Cooling and Heating (Including auto cooling and heating) Air flow selection is determined according to indoor temperature and setting temperature.

  • Page 52: Timer Operation

    The Off timer can be set at a specific time (in 10-minute units) within a 24-hour period. (11) Silent mode As “Silent mode start” signal is received from the wireless remote control, it operates by dropping the outdoor fan tap and the compressor command speed. SRK20ZMX-S SRK25ZMX-S SRK35ZMX-S SRK50ZMX-S...

  • Page 53: Outline Of Heating Operation

    Fuzzy operation Deviation between the indoor temperature setting correction temperature and the return air temperature is calculated in accordance with the fuzzy rule, and used for control of the air capacity and the compressor speed. Model SRK20ZMX-S SRK25ZMX-S SRK35ZMX-S SRK50ZMX-S...

  • Page 54: Outline Of Cooling Operation

    '13 • SRK-T-144 The difference between the outdoor air sensor temperature and the outdoor heat exchanger sensor temperature ¡ The outdoor air temperature ≧ 0ºC (model SRK50, 60 : ≧ － 2ºC) : 7ºC or higher ¡ － 15ºC ≦ The outdoor air temperature ＜ 0ºC (model SRK50, 60 : ＜ － 2ºC) : 4/15 × The outdoor air tem- perature + 7ºC or higher ¡...

  • Page 55: Outline Of Automatic Operation

    Detail of control in each mode (Pattern) Fuzzy operation During the fuzzy operation, the air flow and the compressor speed are controlled by calculating the difference between the indoor temperature setting correction temperature and the return air temperature. Model SRK20ZMX-S SRK25ZMX-S SRK35ZMX-S SRK50ZMX-S SRK60ZMX-S...

  • Page 56: Protective Control Function

    '13 • SRK-T-144 The unit checks the temperature every hour after the start of operation and, if the result of check is not same as the previous operation mode, changes the operation mode. When the unit is started again within one hour after the stop of automatic operation or when the automatic operation is se- lected during heating, cooling or dehumidifying operation, the unit is operated in the previous operation mode.
  • Page 57 '13 • SRK-T-144 Frost prevention control (During cooling or dehumidifying) Operating conditions Indoor heat exchanger temperature (Th2) is lower than 5ºC. compressor command 5 minutes after reaching the compressor command speed except 0 rps. speed (ii) Detail of anti-frost operation Lower Indoor heat exchanger temperature limit...
  • Page 58 '13 • SRK-T-144 Cooling high pressure control Purpose: Prevents anomalous high pressure operation during cooling. (ii) Detector: Outdoor heat exchanger sensor (TH1) (iii) Detail of operation: Model SRK20~35 Model SRK50, 60 TH2 > = 32ºC Outdoor heat exchanger Outdoor heat exchanger temperature (ºC) temperature (ºC) TH2 <...
  • Page 59 '13 • SRK-T-144 Heating high pressure control Purpose: Prevents anomalous high pressure operation during heating. (ii) Detector: Indoor heat exchanger sensor (Th2) (iii) Detail of operation: (Example) Fuzzy 4rps 8rps After lapse of 20 (10) sec. or over 4rps 8rps After lapse of 20 (10) sec.
  • Page 60 calculation exceeds the upper limit, the upper limit value is maintained. The lower limit of compressor command speed is set to 40 rps and even if the calculated result becomes lower than that after fuzzy calculation, the speed is kept to 40 rps. However, when the thermo OFF, the speed is reduced to '13 •...
  • Page 61 '13 • SRK-T-144 • Models SRK50, 60 Operating conditions: When the outdoor air temperature (TH2) is lower than 4ºC or higher continues for 30 sec- onds while the compressor command speed is other than 0 rps. The lower limit compressor command speed is change as shown in the figure below. (ii) Detail of operation: Lower limit 45 rps Lower limit 35 rps...
  • Page 62 '13 • SRK-T-144 (k) Current cut Purpose: Inverter is protected from overcurrent. (ii) Detail of operation: Output current from the inverter is monitored with a shunt resistor and, if the current exceeds the setting value, the compressor is stopped immediately. Operation starts again after a delay time of 3 minutes.
  • Page 63 '13 • SRK-T-144 (ii) Heating Operating conditions: When the outdoor air temperature (TH2) is 4ºC or lower continues for 30 seconds while the compressor command speed is other than 0 rps. 2) Detail of operation: The outdoor fan is stepped up by 2 speed step at each 20 seconds. (Upper limit 8th speed) 3) Reset conditions: When either of the following conditions is satisfied The outdoor air temperature (TH2) is 6ºC or higher.
  • Page 64 '09•SRK-DB-087D '13 • SRK-T-144 Reference Reference 10. MAINTENANCE DATA 2 TROUBLESHOOTING PROCEDURES FOR ELECTRICAL EQUIPMENT (1) Cautions (2) Items to check before troubleshooting (3) Troubleshooting procedure (If the air conditioner does not run at all) Important wireless proced-...
  • Page 65 '09•SRK-DB-087D '13 • SRK-T-144 (4) Troubleshooting procedure (If the air conditioner runs) 66-72. 66-72.

  • Page 66: Self-Diagnosis Table

    '09•SRK-DB-087D '13 • SRK-T-144 (5) Self-diagnosis table Wired Outdoor Indoor unit display panel remote Description control PCB Cause Display (flashing) condition control TIMER of trouble Red LED display light light When a heat exchanger sensor 1 wire disconnection is detected while •...

  • Page 67: Service Mode (Trouble Mode Access Function)

    '09•SRK-DB-087D '13 • SRK-T-144 (6) Service mode (Trouble mode access function) (a) Explanation of terms Explanation Term The service mode is the mode where service data are displayed by flashing of the display lights Service mode when the operations in item (b) below are performed with the indoor controller. These are the contents of error displays and protective stops which occurred in the past in the air conditioner system.
  • Page 68 '09•SRK-DB-087D '13 • SRK-T-144 4-time flash 2-time flash. wireless mode mode Self-diagnosis data wireless mode mode Wireless remote control setting Contents of output data Operation mode Fan speed mode wireless Indicates the number of Wireless remote control setting occasions previous to the present Temperature setting the error display data are from.

  • Page 69: Displayed Data

    '09•SRK-DB-087D '13 • SRK-T-144 (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 70 '09•SRK-DB-087D '13 • SRK-T-144 (c) Error code, stop code table Number of flashes when in service mode Stop coad Error Auto TIMER Error content Cause Occurrence conditions display recovery light Error coad light (10's digit) (1's digit) Normal Can not receive signals for 35 Power supply is faulty.
  • Page 71 '09•SRK-DB-087D '13 • SRK-T-144 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 72: Buzzer Sound

    '09•SRK-DB-087D '13 • SRK-T-144 (e) Temperatare information Room temperature sensor, indoor heat exchanger sensor, outdoor air temperature sensor, outdoor heat exchanger sensor temperature. Units: °C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) temperature information Sensor value displayed when the error code is normal Sensor name...
  • Page 73 '09•SRK-DB-087D '13 • SRK-T-144 (ii) Discharge pipe sensor temperature. Units: °C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) temperature information Sensor value displayed when the error code is normal -64ºC data 0.1 sec.
  • Page 74 '09•SRK-DB-087D '13 • SRK-T-144 Service data record form Wireless r Operation mode Fan speed mode Wireless r Wireless r Wireless r Wireless r Wireless r wireless...

  • Page 75: Inspection Procedures Corresponding To Detail Of Trouble

    '09•SRK-DB-087D '13 • SRK-T-144 (7) Inspection procedures corresponding to detail of trouble Sensor error Broken sensor wire, connector poor connection Sensor temperature characteristics (Room Discharge pipe sensor temperature characteristics temp., indoor heat exchanger temp., out- door heat exchanger temp., outdoor air temp.) - 10 Temperature (˚C)

  • Page 76: Current Cut

    '09•SRK-DB-087D '13 • SRK-T-144 Current cut Compressor lock, Compressor wiring short circuit, Compressor output is open phase, Outdoor PCB is faulty, Service valve is closed, EEV is faulty, Compressor faulty. ＊   ＊ SRC20-35 : 1.703Ω (U-V, V-W, U-W) or more at 20ºC SRC50, 60 : 0.864Ω...
  • Page 77 '09•SRK-DB-087D '13 • SRK-T-144 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 78: Outdoor Fan Motor Error

    '09•SRK-DB-087D '13 • SRK-T-144 Trouble of outdoor unit Insufficient refregerant amount, Faulty power transistor, Broken compressor wire Service valve close, Defective EEV, Defective outdoor PCB ◆  (1)        Notes (1) Check coil wire resistance, see page 75. wire ．...

  • Page 79: Rotor Lock

    '13 • SRK-T-144 Rotor lock Defective compressor, defective outdoor PCB See page 75. Service valve (gas side) closed, Service valve (gas side) closed operation (8) Phenomenon observed after shortcircuit, wire breakage on sensor Defective outdoor PCB (a) Indoor unit Phenomenon Operation Sensor mode...

  • Page 80: Phenomenon Observed After Shortcircuit, Wire Breakage On Sensor

    '13 • SRK-T-144 (8) Phenomenon observed after shortcircuit, wire breakage on sensor (a) Indoor unit Phenomenon Operation Sensor mode Shortcircuit Disconnected wire Cooling Room temperature sensor Heating Freezing cycle system protection trips and stops the compressor. Cooling Heat exchanger sensor Heating Cooling Humidity sensor...

  • Page 81: Indoor Pcb

    Replace indoor PCB. blocks ② and ③ oscillating between DC 0 and 20V? '13 • SRK-T-144 Indoor electrical components are normal. (b) Indoor unit fan motor check procedure 1) Indoor PCB output check ① ④ ⑤ DC several V (–) DC 308~336V (4~6 V) Measuring...

  • Page 82: How To Make Sure Of Wireless Remote Control

    Operation SW ON Measure in this section '13 • SRK-T-144 (10) How to make sure of wireless remote control wireless wireless wireless wireless wireless wireless   Simplified check methd of wireless remote control It is normal if the signal transmission section of the wireless remote control emits a whitish light at each transmission on the monitor of digital camera or camera of mobile phone.

  • Page 83: Outdoor Unit Inspection Points

    '13 • SRK-T-144 (12) Outdoor unit inspection points Models SRC20ZMX-S, 25ZMX-S, 35ZMX-S ◆Check point of outdoor unit CAUTION- HIGH VOLTAGE ◆Power source and serial signal inspection High voltage is produced in the control box. Don't touch electrical parts in the control box for 5 minutes after the : AC 220/230/240V unit is stopped.
  • Page 84 '13 • SRK-T-144 Models SRC50ZMX-S, 60ZMX-S ◆Check point of outdoor unit CAUTION- HIGH VOLTAGE ◆Power source and serial signal inspection High voltage is produced in the control box. Don't touch : AC 220/230/240V electrical parts in the control box for 5 minutes after the : AC 220/230/240V unit is stopped.
  • Page 85 '09•SRK-DB-087D '13 • SRK-T-144 (a) Inspection of electronic expansion valve (ii) (iii) (iv) • Inspection of electronic expansion valve as a separate unit Measuring point Resistance when normal (b) Outdoor unit fan motor check procedure          ② Measuring Voltage range when point normal ⑥ ...

  • Page 86: Option Parts

    '13 • SRK-T-144 11. OPTION PARTS Installation manual for wired remote controller PJA012D730 Connect the remote control co (1) Wired remote control (RC-E5) terminal block. Connect the terminal of remo Read together with indoor unit's installation manual. with the terminal of indoor uni (X and Y are no polarity) WARNING Wiring route is as shown in th...
  • Page 87 '13 • SRK-T-144 mote controller Connect the remote control cord to the Sheath Sheath The range of temperature setting Upper Upper terminal block. When shipped, the range of set tempera Connect the terminal of remote control (X,Y) Upper case Upper case Board Board Heating : 16 ~ 30°C (55 ~ 86°F)
  • Page 88 '13 • SRK-T-144 PJ A0 12 D73 0 Sheath eath The range of temperature setting Upper When shipped, the range of set temperature differs depending on the operation mode as below. er 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 89 '13 • SRK-T-144 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 90 '13 • SRK-T-144 Note 1: The initial setting marked “ ” is decided by connected indoor and outdoor unit, and is automatically defined as following table. Item Function No. 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 91: Function Set

    '13 • SRK-T-144 PJA0 12 D7 30 utomatically defined as following table. Operation message How to set function e indoor unit. Function description: Function No. Stop air-conditioner and press (SET) (MODE) setting description: N" mode buttons at the same time for over three seconds, and the step of air flow setting "FUNCTION SET "...

  • Page 92: Interface Kit (Sc-Bikn-E)

    '13 • SRK-T-144 (2) Interface kit (SC-BIKN-E) RKZ012A088B Accessories included in package Safety precautions Before use, please read these Safety Precautions thoroughly before installation. Be sure to check all the accessories included in package. ●All the cautionary items mentioned below are important safety related items to be taken into consideration, so be sure to observe them at all times.
  • Page 93 '13 • SRK-T-144 Installation of the interface ・Install the interface within the range of the connection cable length from the indoor unit. (approximately 1.8m) Wiring inlet ・Be sure not to extend the connection cable on site. If the connection cable is extended, malfunction may occur. ・Fix the interface on the wall, pillar or the like.
  • Page 94 '13 • SRK-T-144 Functions of CNT connector It is available to operate the air conditioning unit and to monitor the operation status with the external control unit (remote display) by sending the input/output signal through CNT connector on the indoor control PCB. 0.75mm Note (1) 0.3mm ×2m...
  • Page 95 '13 • SRK-T-144 Connection of wired remote control Regarding the connection of wired remote control, refer to the instruction manual of wired remote control. ①Switch ON the DIP switch SW2-2 (Factory setting : ON) on the interface PCB. DIP suitch Caution:Wireless remote control attached to the indoor unit can be used in parallel, after connecting the wired remote control.

  • Page 96: Super Link E Board (Sc-Adna-E)

    '13 • SRK-T-144 (3) Super link E board (SC-ADNA-E) WARING CAUTION...
  • Page 97 '13 • SRK-T-144...

  • Page 98: Technical Information

    Rated air flow(outdoor) 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. 7 Roundwood Avenue, Stockley Park, Uxbridge, Middlesex, UB11 1AX, United Kingdom RWA000Z252-10 RWA000Z252...
  • Page 99 Rated air flow(outdoor) 1770 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. 7 Roundwood Avenue, Stockley Park, Uxbridge, Middlesex, UB11 1AX, United Kingdom RWA000Z252-11 RWA000Z252...
  • Page 100 Rated air flow(outdoor) 1950 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. 7 Roundwood Avenue, Stockley Park, Uxbridge, Middlesex, UB11 1AX, United Kingdom RWA000Z252-12 RWA000Z252...
  • Page 101 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. 7 Roundwood Avenue, Stockley Park, Uxbridge, Middlesex, UB11 1AX, United Kingdom RWA000Z252-3 RWA000Z252...
  • Page 102 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. 7 Roundwood Avenue, Stockley Park, Uxbridge, Middlesex, UB11 1AX, United Kingdom RWA000Z252-4 RWA000Z252...
  • Page 103 INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS Air-Conditioning & Refrigeration Systems 16-5, Konan 2-chome, Minato-ku, Tokyo, 108-8215 Japan http://www.mhi.co.jp 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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Srk25zmx-sSrk35zmx-sSrk50zmx-sSrk60zmx-s

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