Mitsubishi Heavy Industries SRK25ZJ-S Technical Manual
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Mitsubishi Heavy Industries SRK25ZJ-S Technical Manual

Inverter wall mounted type residential air-conditioners (split system, air to air heat pump type)
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See also: Service Manual , User Manual
TECHNICAL MANUAL
INVERTER WALL MOUNTED TYPE
RESIDENTIAL AIR-CONDITIONERS
(Split system, air to air heat pump type)
Indoor unit / Outdoor unit
SRK25ZJ-S / SRC25ZJ-SA
SRK35ZJ-S / SRC35ZJ-SA
SRK20ZJX-S / SRC20ZJX-SA
SRK25ZJX-S / SRC25ZJX-SA
SRK35ZJX-S / SRC35ZJX-SA
Manual No.'10•SRK-T-098

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Summary of Contents for Mitsubishi Heavy Industries SRK25ZJ-S

  • Page 1 Manual No.'10•SRK-T-098 TECHNICAL MANUAL INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS (Split system, air to air heat pump type) Indoor unit / Outdoor unit SRK25ZJ-S / SRC25ZJ-SA SRK35ZJ-S / SRC35ZJ-SA SRK20ZJX-S / SRC20ZJX-SA SRK25ZJX-S / SRC25ZJX-SA SRK35ZJX-S / SRC35ZJX-SA...

  • Page 2: Table Of Contents

    7. CAPACITY TABLES ................... 26 .................. 28 8. APPLICATION DATA 8.1 Installation of indoor unit ..............28 (1) Models SRK25ZJ-S,35ZJ-S ..............28 (2) Models SRK20ZJX-S,25ZJX-S,35ZJX-S ..........32 8.2 Installation of outdoor unit ..............36 9. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ....43 9.1 Models SRK25,35ZJ-S...
  • Page 3 '10 • SRK-T-098 '10 • SRK-T-098 9.2 Models SRK20～35ZJX-S ..............56 (1) Operation control function by remote controller ........56 (2) Unit ON/OFF button ................57 (3) Auto restart function ................57 (4) Custom cord switching procedure ............57 ..............58 (5) Flap and louver control (6) 3D auto operation ................

  • Page 4: Specifications

    '10 • SRK-T-098 '09•SRK-DB-087D 1. SPECIFICATIONS Adapted to RoHS directive SRK25ZJ-S Model Item Indoor unit SRK25ZJ-S Outdoor unit SRC25ZJ-SA Cooling capacity (1) 2500 (1000 (Min.) ~ 2900 (Max.)) Heating capacity (1) 3200 (1200 (Min.) ~ 4200 (Max.)) Power supply 1 Phase, 220 ~ 240 V, 50Hz Cooling 0.62 (0.21 ~ 0.88)
  • Page 5 '09•SRK-DB-087D '10 • SRK-T-098 Adapted to RoHS directive SRK35ZJ-S Model Item SRK35ZJ-S SRC35ZJ-SA Indoor unit Outdoor unit Cooling capacity (1) 3500 (1000 (Min.) ~ 3800 (Max.)) Heating capacity (1) 4000 (1300 (Min.) ~ 4800 (Max.)) Power supply 1 Phase, 220 ~ 240 V, 50Hz Cooling 1.01 (0.21 ~ 1.24) Power...
  • Page 6 '10 • SRK-T-098 Adapted to RoHS directive SRK20ZJX-S Model Item Indoor unit SRK20ZJX-S Outdoor unit SRC20ZJX-SA Cooling capacity (1) 2000 (900 (Min.)~3100 (Max.)) Heating capacity (1) 2500 (900 (Min.)~4300 (Max.)) Power supply 1 Phase, 220~240 V, 50Hz Cooling 0.35 (0.19~0.70) Power consumption Heating...
  • Page 7 '10 • SRK-T-098 Adapted to RoHS directive SRK25ZJX-S Model Item Indoor unit SRK25ZJX-S Outdoor unit SRC25ZJX-SA Cooling capacity (1) 2550 (900 (Min.)~3200 (Max.)) Heating capacity (1) 3130 (900 (Min.)~4700 (Max.)) Power supply 1 Phase, 220~240 V, 50Hz Cooling 0.49 (0.19~0.82) Power consumption Heating...
  • Page 8 '10 • SRK-T-098 Adapted to RoHS directive SRK35ZJX-S Model Item Indoor unit SRK35ZJX-S Outdoor unit SRC35ZJX-SA Cooling capacity (1) 3500 (900 (Min.)~4100 (Max.)) Heating capacity (1) 4300 (900 (Min.)~5100 (Max.)) Power supply 1 Phase, 220~240 V, 50Hz Cooling 0.845 (0.19~1.01) Power consumption Heating...
  • Page 9 Symbol Content 14.5 Gas piping 9.52 3 8" Flare Liquid piping 6.35 1 4" Flare Hole on wall for right rear piping Hole on wall for left rear piping Drain hose VP16 Outlet for wiring Outlet for piping on both side Wireless remote controller Outlet for down piping 17.3...
  • Page 10 881.9 Symbol Content 59.9 59.9 20.9 Gas piping 9.52 3 8" Flare Liquid piping 6.35 1 4" Flare Hole on wall for right rear piping Hole on wall for left rear piping Drain hose VP16 Outlet for wiring Outlet for piping on both side Wireless remote controller Outlet for down piping Terminal block...
  • Page 11 50.6 Notes 1 It must not be surrounded by walls on the four sides. 390.6 2 The unit must be fixed with anchor bolts. An anchor bolt must not 390.6 50.6 112.2 protrude more the 15mm. 3 Where the unit is subject to strong winds, lay it in such 179.6 48.1 a direction that the blower outlet faces perpendicularly...

  • Page 12: Terminal Block

    390.6 50.6 112.2 Notes （1） It must not be surrounded by walls on the four sides. 179.6 48.1 （2） The unit must be fixed with anchor bolts. An anchor bolt must not protrude more the 15mm. 38.8 （3） Where the unit is subject to strong winds, lay it in such a direction that the blower outlet faces perpendicularly to the dominant wind direction.

  • Page 13: Remote Controller

    '10 • SRK-T-098 2.3 Remote controller (a) Wireless remote controller The wireiess remote controller in the following figure shows for the SRK series. Unit: mm 17.3...

  • Page 14: Specifications

    '10 • SRK-T-098 (b) Wired remote controller (option parts) Wiring outlet Cut off the upper thin part of remote control lower case with a nipper or knife, and grind burrs with a file etc. Exposed mounting In case of pulling out In case of pulling out from upper left from center...

  • Page 15: Circuit Board

    Item Description CNE-CNY Connector Fan motor Flap motor Louver motor Humidity sensor Room temp. sensor Heat exch. sensor Diode stack Fuse PRINTED Terminal block CIRCUIT Varistor BOARD HEAT EXCHANGER Mark Color 250V 3.15A Black Blue White Yellow Yellow Green HEAT EXCHANGER DISPLAY WIRELESS...
  • Page 16 Item Description CNE-CNY Connector Fan motor DISPLAY Flap motor WIRELESS RECEIVER CNX1 Louver motor BACK-UP SW Inlet motor PRINTED CIRCUIT Room temp. sensor BOARD Heat exch. sensor Humidity sensor 50,60 only CNX2 Limit switch Diode stack Fuse Terminal block Varistor INTERFACE KIT SC-BIKN-E Color Marks...

  • Page 17: Outdoor Units

    TO INDOOR UNIT POWER WIRES SIGNAL WIRE PWB ASSY T1 T2 POWER POWER SOURCE TRANSISTOR 1 220 240V 50Hz 1 220V 60Hz 250V 15A R.IN 250V 20A NOISE FILTER S.IN F3 250V 1A CIRCUIT CNFAN 250V 10A SWITCHING POWER CIRCUIT CN20S CNHEAT CNTH...

  • Page 18: Noise Level

    '10 • SRK-T-098 '09•SRK-DB-087D 4. NOISE LEVEL Model SRK25ZJ-S Model SRK25ZJ-S Condition ISO-T1, JIS C9612 (Indoor Unit) Model SRK25ZJ-S Cooling 34 dB(A) Noise Level Heating 39 dB(A) × ..Cooling Heating 1000 2000 4000 8000 Mid Octave Band frequency (Hz)
  • Page 19 '09•SRK-DB-087D '10 • SRK-T-098 Model SRK35ZJ-S Model SRK35ZJ-S Condition ISO-T1, JIS C9612 (Indoor Unit) Model SRK35ZJ-S 42 dB(A) Cooling Noise Level Heating 43 dB(A) × ..Cooling Heating 1000 2000 4000 8000 Mid Octave Band frequency (Hz) (Outdoor Unit) Model SRC35ZJ-SA Cooling 50 dB(A)
  • Page 20 '10 • SRK-T-098 Model SRK20ZJX-S Condition ISO-T1,JIS C9612 (Indoor Unit) Model SRK20ZJX-S Noise Cooling 39 dB(A) Level Heating 38 dB(A) × ..Cooling, Heating N 7 0 N 6 0 N 5 0 N 4 0 N 3 0 N 2 0 1000 2000 4000...
  • Page 21 '10 • SRK-T-098 Model SRK25ZJX-S Condition ISO-T1,JIS C9612 (Indoor Unit) Model SRK25ZJX-S Cooling 41 dB(A) Noise Level Heating 41 dB(A) × ..Cooling, Heating N 7 0 N 6 0 N 5 0 N 4 0 N 3 0 N 2 0 1000 2000 4000...
  • Page 22 '10 • SRK-T-098 Model SRK35ZJX-S Condition ISO-T1,JIS C9612 (Indoor Unit) Model SRK35ZJX-S Noise Cooling 43 dB(A) Level Heating 42 dB(A) × ..Cooling, Heating N 7 0 N 6 0 N 5 0 N 4 0 N 3 0 N 2 0 1000 2000 4000...
  • Page 23 '09•SRK-DB-087D '10 • SRK-T-098 5. PIPING SYSTEM 5 PIPING SYSTEM Model SRK25ZJ-S / SRC25ZJ-SA Model SRK35ZJ-S / SRC35ZJ-SA Humidity sensor (HD)
  • Page 24 '10 • SRK-T-098 Models SRK20ZJX-S, 25ZJX-S, 35ZJX-S Models SRK20ZJX-S, 25ZJX-S, 35ZJX-S / SRC20ZJX-SA, 25ZJX-SA, 35ZJX-SA Cooling cycle Heating cycle Indoor unit Outdoor unit Outdoor air Flare temp. sensor connection Service valve (TH2) (Gas) Discharge pipe temp. sensor Gas pipie Check joint Heat Muffler (TH3)

  • Page 25: Selection Chart

    '10 • SRK-T-098 6. RANGE OF USAGE & LIMITATIONS RANGE OF USAGE & LIMITATIONS Models All models Item Cooling operation : Approximately 18 to 32℃ D.B. Indoor return air temperature Heating operation : Approximately 10 to 27℃ D.B. (Upper, lower limits) (Refer to the selection chart) Cooling operation : Approximately -15 to 46℃...
  • Page 26 '09•SRK-DB-087D '10 • SRK-T-098 (2) Correction of cooling and heating capacity in relation to one way length of refrigerant piping Piping length [m] Cooling 0.99 0.975 0.965 0.95 0.935 Heating (3) Correction relative to frosting on outdoor heat exchanger during heating Air inlet temperature of 5 or more outdoor unit in °C WB...

  • Page 27: Capacity Tables

    '10 • SRK-T-098 7. CAPACITY TABLES Model SRK25ZJ-S Cool Mode Heat Mode Indoor air temp indoor air temp outdoor 21˚CDB 23˚CDB 26˚CDB 27˚CDB 28˚CDB 31˚CDB 33˚CDB Outdoor Air flow air temp. Air flow air temp. 14˚CWB 16˚CWB 18˚CWB 19˚CWB 20˚CWB 22˚CWB...
  • Page 28 '10 • SRK-T-098 Model SRK20ZJX-S Cool Mode Heat Mode 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 19˚CWB 20˚CWB 22˚CWB 24˚CWB 16˚CDB 18˚CDB 20˚CDB 22˚CDB...

  • Page 29: 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 (1) Models SRK25ZJ-S, 35ZJ-S greenhouse gas, covered by the Kyoto Protocol with Global condition.
  • Page 30 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) 6.5 cm minimum from the ceiling Indoor unit Installation board Standard accessories (Installation kit) Where there is no obstructions to the air flow and where the cooled and heated air can be evenly distributed. Q’ty Accessories for indoor unit A solid place where the unit or the wall will not vibrate.

  • Page 31: Connection Of Refrigerant Pipings

    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. Latch (2 locations) • How to remove the indoor unit from the installation board Installation Steps Wall Pass the pipe through...
  • Page 32 ELECTRICAL WIRING WORK Installing the air-cleaning filters Screw 1. Open the air inlet panel and remove the air filters. Preparation of indoor unit CAUTION 2. Install the filter holders, with the air-cleaning filters installed in the holders. In case of faulty wiring connection, the indoor unit stops, and In the air conditioner.

  • Page 33: Selection Of Installation Location

    R410A REFRIGERANT USED Models SRK20ZJX-S, 25ZJX-S, 35ZJX-S WALL MOUNTED TYPE AIR CONDITIONER. This instruction manual illustrates the method of installing an indoor unit. RKY012A007 For electrical wiring work, please see instructions set out on the backside. For outdoor unit installation and refrigerant piping, please refer to page 36. A wired remote control unit is supplied separately as an optional part.

  • Page 34: Installation Of Indoor Unit

     The connection to the fixed wiring of the mains supply must be made via a double pole isolating switch with a contact gap of at least 3mm in each pole. This may cause fire or heating.  When the outdoor unit has a possibility of being overturned or being displaced and fall from its original installation position, the outdoor unit should be ...

  • Page 35: Electrical Wiring Work

    RKY012A007 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. Indoor unit  How to remove the indoor unit from the installation board Installation Steps Wall Latch...
  • Page 36  Cover the indoor unit’s flare-connected joints, after they are checked for a gas leak, with an indoor Wood screw Gas side (ø9.52) : 34.0 - 42.0 N·m (3.4 - 4.2 kgf·m) unit heat insulating material and then wrap them with a tape with an attached insulation pad placed (ø12.7) : 49.0 - 61.0 N·m (4.9 - 6.1 kgf·m) over the heat insulating material’s slit area.

  • Page 37: Installation Of Outdoor Unit

    RWC012A030A 8.2 Installation of outdoor unit Model 20 · 25 · 35 Models SRC25ZJ-SA, 35ZJ-SA R410A REFRIGERANT USED SRC20ZJX-SA, 25ZJX-SA, 35ZJX-SA • This installation manual deals with outdoor units and general installation specifications only. For indoor units, refer to page 28 or 35. •...
  • Page 38 CAUTION • Use the circuit breaker with sufficient breaking capacity. • Take care when carrying the unit by hand. • When perform the air conditioner operation (cooling or drying If the breaker does not have sufficient breaking capacity, it can cause If the unit weights more than 20kg, it must be carried by two or more operation) in which ventilator is installed in the room.
  • Page 39 Notabilia as a unit designed for R410A Do not use any refrigerant other than R410A. R410A will rise to pressure about 1.6 times higher than that of a conventional refrigerant. A cylinder containing R410A has a pink indication mark on the top. A unit designed for R410A has adopted a different size indoor unit operation valve charge port and a different size check joint provided in the unit to prevent the charging of a wrong refrigerant by mistake.

  • Page 40: 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. Additional refrigerant charge is not required at all.
  • Page 41 CAUTION Do not apply force beyond proper fastening torque in tightening the flare nut. Fix both liquid and gas operation valves at the valve main bodies as illustrated on the right, and then fasten them, applying appropriate fastening torque. Operation valve size (mm) Tightening torque (N·m) Tightening angle ( ) Recommended length of a tool handle (mm)

  • Page 42: Drain Piping Work

    3. DRAIN PIPING WORK Execute drain piping by using a drain elbow and drain grommets supplied separately as optional parts, where water drained from the outdoor unit is a problem. CAUTION When condensed water needs to be Water may drip where there is a larger amount of drain led to a drain, etc., install the unit on water.

  • Page 43: After Installation

    Power supply terminal block Power cable, indoor-outdoor connecting wires Cable clamp Always perform grounding system installation work with the power cord unplugged. Earth leakage breaker It holds cables in place and protect the terminal (Harmonic resistant type) Always use an earth leakage circuit breaker designed for inverter circuits to CAUTION connection from external force.

  • Page 44: Remote Controller

    '09•SRK-DB-087D '10 • SRK-T-098 9 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER Reference 9.1 Models SRK25, 35ZJ-S 1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Operation control function by remote controller 1. Operation control function by remote controller Operation section FAN SPEED button OPERATION MODE select button Each time the button is pressed, the Each time the button pressed, the...
  • Page 45 '09•SRK-DB-087D '10 • SRK-T-098 (2) Unit ON/OFF button (a) Operation (b) Details of operation Function Indoor temperature Fan speed Flap/Louver Timer Switch setting operation mode Cooling Thermal dry Heating Unit ON/OFF button (3) Auto restart function Jumper wire (JA1) Jumper wire (JA2) (4) Custom cord switching procedure (a) Modifying the indoor printed circuit board (b) Modifying the wireless remote controller...
  • Page 46 '09•SRK-DB-087D '10 • SRK-T-098 (5) Flap and louver control (a) Flap (Flap stopped) (Swing) Angle of Flap from Horizontal Remote controller display Approx. 10° Approx. 25° Approx. 40° Approx. 50° Approx. 60° COOL , DRY, FAN Approx. 25° Approx. 40° Approx.
  • Page 47 '09•SRK-DB-087D '10 • SRK-T-098 (6) 3D auto operation Air flow selection Operation mode AUTO < = Indoor temp. – Setting temp. >5°C Indoor temp. – Setting temp. 5°C At cooling HIGH POWER AUTO < = Setting temp. – Indoor temp. >5°C Setting temp.
  • Page 48 '09•SRK-DB-087D '10 • SRK-T-098 (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. Press the AIR FLOW (UP/DOWN) button and the AIR FLOW...
  • Page 49 ON(HOT KEEP) Indoor fan motor Outdoor fan motor (few minutes ON) 4-way valve (3 minutes ON) (b) Details of control at each operation mode (pattern) 1) Fuzzy operation Model SRK25ZJ-S SRK35ZJ-S Fan speed 30~115rps 30~115rps Auto 30~115rps 30~115rps 30~72rps 30~76rps...
  • Page 50 Thermostat OFF Failure Compressor Indoor fan motor Outdoor fan motor (few minutes ON) (few minutes ON) 4-way valve (b) Detail of control in each mode (Pattern) Fuzzy operation Model SRK25ZJ-S SRK35ZJ-S Fan speed 20~74rps 20~98rps Auto 20~74rps 20~98rps 20~55rps 20~58rps 20~34rps...
  • Page 51 Dehumidifying Indoor air temperature (˚C) 18.0 '10 • SRK-T-098 Heating Outdoor air temperature (˚C) When both the indoor and the outdoor air temperatures are in the range “A”, cooling or heating is switched depending on the difference between the setting temperature and the indoor air temperature. When the operation mode has been judged following the change of setting temperature with the remote controller, the hourly judgment of operation mode is cancelled.
  • Page 52 Detail of operation The lower limit of compressor command speed is set to 30 or 40 rps and even if the calculated result becomes lower '10 • SRK-T-098 than that after fuzzy calculation, the speed is kept to 30 or 40 rps. However, when the thermo becomes OFF, the speed is reduced to 0 rps.

  • Page 53: Indoor Units

    seconds times Reset conditions: '10 • SRK-T-098 (e) Heating high pressure control Purpose: Detector: Detail of operation: (Example) Fuzzy After lapse of 20 sec. or over 4rps 8rps After lapse of 20 sec. or over 4rps 8rps lower limit After lapse of 20 sec. or over speed 30 rps 0rps Indoor heat exchanger temperature(°C)
  • Page 54 Normal operation '10 • SRK-T-098 Outdoor air temperature(°C) Reset conditions: (g) Heating low outdoor temperature protective control Operating conditions: Detail of operation: Lower limit 45 rps Lower limit 40 rps '09•SRK-DB-087D Normal operation Outdoor air temperature(°C) When either of the following condition is satisfied. Reset conditions: Reset conditions: The outdoor air temperature (TH2) becomes 6ºC.
  • Page 55 Detail of operation: '10 • SRK-T-098 Current cut Purpose: Detail of operation: (k) Outdoor unit failure item 1), 2) is satisfied. Once the unit is stopped by this function, ti is not Indoor fan motor protection '09•SRK-DB-087D (m) Serial signal transmission error protection Purpose: Detail of operation: Rotor lock...
  • Page 56 '10 • SRK-T-098 Reset conditions: Heating Operating conditions: Detail of operation: Reset conditions: Refrigeration cycle system protection Starting conditions When 5 minutes have elapsed after the compressor ON or the completion of the defrost control Other than the defrost control When, after meeting the conditions of a) and b) above, the compressor speed, indoor air temperature (Th1) and indoor heat exchanger temperature (Th2) have met the conditions in the following table for 5 minutes: Indoor air temperature (Th1)/...

  • Page 57: Operation Control Function By Remote Controller

    '10 • SRK-T-098 9.2 Models SRK20~35ZJX-S (1) Operation control function by remote controller S Operation section FAN SPEED button OPERATION MODE select button Each time the button is pressed, the Each time the button pressed, the display is switched over in turn. display is switched over in turn.

  • Page 58: Auto Restart Function

    '10 • SRK-T-098 (2) Unit ON/OFF button When the remote controller batteries become weak, or if the remote controller 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 59: Flap And Louver Control

    '10 • SRK-T-098 (5) Flap and louver control   Control the flap and louver by AIRFLOW (UP/DOWN) and (LEFT/RIGHT) button on the wireless remote controller.   Flap   Each time when you press the AIRFLOW (UP/DOWN) button the mode changes as follows. (Flap stopped) (Swing) Angle of Flap from Horizontal...
  • Page 60 '10 • SRK-T-098 (6) 3D auto operation Control the flap and louver by 3D AUTO button on the wireless remote controller. 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 61: Timer Operation

    '10 • SRK-T-098 (7) Timer operation Comfortable timer setting (ON timer) If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in auto mode operation is selected, the comfortable timer starts and determines the starting time of next operation based on the initial value of 15 minutes and the relationship between the indoor temperature at the setting time (temperature of room temperature sensor) and the setting temperature.

  • Page 62: Outline Of Heating Operation

    '10 • SRK-T-098 (9) Outline of heating operation Operation of major functional components in heating mode Heating Thermostat ON Thermostat OFF Failure Compressor ON(HOT KEEP) Indoor fan motor Outdoor fan motor (few minutes ON) 4-way valve (3 minutes ON) Details of control at each operation mode (pattern) 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.

  • Page 63: Outline Of Cooling Operation

    '10 • SRK-T-098 During continuous compressor operation In addition, when the speed command from the indoor controller of the indoor unit during heating operation has counted 0 rps 10 times or more and all conditions of a), b), c) and e) above and the outdoor air temperature is 3ºC or less are satisfied (note that when the temperature for outdoor heat exchanger sensor (TH1) is －...

  • Page 64: Protective Control Function

    '10 • SRK-T-098 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 selected during heating, cooling or dehumidifying operation, the unit is operated in the previous operation mode.
  • Page 65 '10 • SRK-T-098 Cooling high pressure control Purpose: Prevents anomalous high pressure operation during cooling. Detector: Outdoor heat exchanger sensor (TH1) Detail of operation: (Example) Fuzzy After lapse of 30 sec. or over 6rps 6rps After lapse of 30 sec. or over lower limit After lapse of 30 sec.
  • Page 66 '10 • SRK-T-098 Heating high pressure control Purpose: Prevents anomalous high pressure operation during heating. Detector: Indoor heat exchanger sensor (Th2) Detail of operation: (Example) Fuzzy 4rps 8rps After lapse of 20 sec. or over 4rps 8rps After lapse of 20 sec. or over lower limit After lapse of 20 sec.
  • Page 67 '10 • SRK-T-098 Heating low outdoor temperature protective control Operating conditions:　 When the outdoor air temperature (TH2) is lower than - 10ºC or higher continues for 30 sec- onds while the compressor command speed is other than 0 rps. Detail of operation:　　 The lower limit compressor command speed is change as shown in the figure below. Lower limit 45 rps Normal operation Outdoor air temperature (°C)
  • Page 68 '10 • SRK-T-098 Current cut Purpose: Inverter is protected from overcurrent. 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 69: Defrost Heater Control

    '10 • SRK-T-098 ◆ 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. Detail of operation: The outdoor fan is stepped up by 2 speed step at each 20 seconds. (Upper limit 8th speed) Reset conditions: When either of the following conditions is satisfied The outdoor air temperature (TH2) is 6ºC or higher.

  • Page 70: Maintenance Data

    '09•SRK-DB-087D '10 • SRK-T-098 Reference Reference 10 MAINTENANCE DATA 2 TROUBLESHOOTING PROCEDURES FOR ELECTRICAL EQUIPMENT 10.1 Cautions 10.2 Items to check before troubleshooting 10.3 Troubleshooting procedure (If the air conditioner does not run at all) Important...

  • Page 71: Troubleshooting Procedure (If The Air Conditioner Runs)

    '09•SRK-DB-087D '10 • SRK-T-098 10.4 Troubleshooting procedure (If the air conditioner runs) 72 ~ 78. 72 ~ 78.

  • Page 72: Self-Diagnosis Table

    '09•SRK-DB-087D '10 • SRK-T-098 10.5 Self-diagnosis table Wired Indoor unit display panel remote Description Cause Display (flashing) condition controller 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 73: Service Mode (Trouble Mode Access Function)

    '09•SRK-DB-087D '10 • SRK-T-098 10.6 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 74 '09•SRK-DB-087D '10 • SRK-T-098 1) Self-diagnosis data Remote controller setting Contents of output data Indicates the number of Remote controller setting occasions previous to the present Temperature setting the error display data are from. 1 time previous (previous time) 21ºC 22ºC 2 times previous 23ºC...

  • Page 75: Remote Controller Setting

    '09•SRK-DB-087D '10 • SRK-T-098 (Example) Remote controller setting Operation Displayed data Fan speed Temperature switching switching 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 76 '09•SRK-DB-087D '10 • SRK-T-098 (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 77 '09•SRK-DB-087D '10 • SRK-T-098 (d) Remote controller information tables Display pattern when Display pattern when Fan speed in service mode in service mode Operation switching switching when when there is an there is an RUN light TIMER light abnormal stop abnormal stop (Operation switching) (Fan speed switching)
  • Page 78 '09•SRK-DB-087D '10 • SRK-T-098 (e) Room temperature sensor, indoor heat exchanger sensor, outdoor air temperature sensor, outdoor heat exchanger sensor table Units: °C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) Sensor value displayed when the error code is normal Sensor name -64ºC...
  • Page 79 '09•SRK-DB-087D '10 • SRK-T-098 Discharge pipe sensor table Units: °C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) Sensor value displayed when the error code is normal -64ºC 0.1 sec. If the temperature is < 0, the buzzer sounds. If the temperature is 0, the buzzer does not sound.
  • Page 80 '09•SRK-DB-087D '10 • SRK-T-098 Service data record form...

  • Page 81: Inspection Procedures Corresponding To Detail Of Trouble

    '09•SRK-DB-087D '10 • SRK-T-098 10.7 Inspection procedures corresponding to detail of trouble Broken sensor wire, Sensor error 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 82 '09•SRK-DB-087D '10 • SRK-T-098 Compressor lock, Compressor wiring short circuit, Compressor output is open phase, Current cut Outdoor PCB is faulty, Service valve is closed, EEV is faulty, Compressor faulty. 1.703Ω (U-V, V-W, U-W) or more at 20ºC Overload operation, compressor Current safe stop lock, overcharge...

  • Page 83: Over Heat Of Compressor

    '09•SRK-DB-087D '10 • SRK-T-098 Gas shortage, defective discharge Over heat of compressor pipe sensor Wiring error including power cable, defective indoor/ Error of signal transmission outdoor PCB...

  • Page 84: Outdoor Fan Motor Error

    '09•SRK-DB-087D '10 • SRK-T-098 Insufficient refregerant amount, Faulty power transistor, Broken compressor wire Trouble of outdoor unit Service valve close, Defective EEV, Defective outdoor PCB Notes (1) Check coil resistance, see page 81. Defective fan motor, connector poor Outdoor fan motor error connection, defective outdoor PCB the fan motor and outdoor Replace outdoor fan motor...

  • Page 85: Phenomenon Observed After Shortcircuit, Wire Breakage On Sensor

    '10 • SRK-T-098 Defective compressor, defective Rotor lock outdoor PCB Defective compressor, defective Rotor lock outdoor PCB See page 81. See page 81. 10.8 Phenomenon observed after shortcircuit, wire breakage on sensor 10.8 Phenomenon observed after shortcircuit, wire breakage on sensor (a) Indoor unit (a) Indoor unit Phenomenon...

  • Page 86: Checking The Indoor Electrical Equipment

    '09•SRK-DB-087D '10 • SRK-T-098 (b) Outdoor unit Phenomenon Operation Sensor mode Shortcircuit Disconnected wire Cooling Heat exchanger Defrosting is performed for 10 minutes at approx. 45 (models 50, 60 : 35) minutes. sensor Heating Cooling Ourdoor air Defrosting is performed for 10 minutes at approx. 45 (models 50, 60 : 35) minutes. temperature sensor Heating Discharge pipe...

  • Page 87: How To Make Sure Of Wireless Remote Controller

    '09•SRK-DB-087D '10 • SRK-T-098 (C) Power transistor inspection procedure [Use a tester with a needle indicator for the inspection. (Do not use a digital tester. Check in the AC 300 volt range.)] (1) If there is a self-diagnosis display, inspect the compressor system (burns, wiring mistakes, etc.) If no problems are found, check the output of the power transistor.
  • Page 88 Check point of outdoor unit CAUTION- HIGH VOLTAGE High voltage is produced in the control box. Don't touch electrical parts in the control box for 5 minutes after the unit is stopped. Color symbol Black Inspection power transistor Remove the fasten terminal and test output voltage Orange Indoor unit White...
  • Page 89 '09•SRK-DB-087D '10 • SRK-T-098 (a) Inspection of electronic expansion valve • Inspection of electronic expansion valve as a separate unit Measuring point Resistance when normal (b) Outdoor unit fan motor check procedure Measuring Resistance when point normal CNFAN Outdoor PCB DC several (4~7V) DC308~336V DC15V...

  • Page 90: Option Parts

    '10 • SRK-T-098 11. OPTION PARTS PJA012D729A 11.1 Instullation of wired remote controller (RC-E4) Installation manual for wired remote controller Connect the remote cont terminal block. Connect the terminal of r Read together with indoor unit's installation manual. with the terminal of indoo (X and Y are no polarity) WARNING Wiring route is as shown...
  • Page 91 '10 • SRK-T-098 ote controller Connect the remote controller cord to the Sheath Sheath The range of temperature settin Upper Upper terminal block. When shipped, the range of set tem Upper case Connect the terminal of remote controller (X,Y) Upper case Board Board Heating : 16 ~ 30˚C (55 ~ 86˚F...
  • Page 92 '10 • SRK-T-098 P J A 0 1 2 D 7 2 9 A Sheath The range of temperature setting Upper When shipped, the range of set temperature differs depending on the operation mode as below. Upper case Board Heating : 16 ~ 30˚C (55 ~ 86˚F) Except heating (cooling, fan, dry, automatic) : 18 ~ 30˚C (62 ~ 86˚F) Upper limit and lower limit of set temperature can be changed with remote controller.
  • Page 93 '10 • SRK-T-098 The functional setting The initial function setting for typical using is performed automatically by the indoor unit connected, when remote controller 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 94 '10 • SRK-T-098 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 controller function02 Indoor unit without "Auto-RUN" mode Indoor unit with two or three step of air flow setting Remote controller function06...

  • Page 95: How To Set Function

    '10 • SRK-T-098 P J A 0 1 2 D 7 2 9 A ly defined as following table. Operation message How to set function nit. Function description: Function No. Stop air-conditioner and press (SET) (MODE) setting description: buttons at the same time for over three seconds, and the flow setting "FUNCTION SET "...

  • Page 96: Interface Kit (Sc-Bikn-E)

    '10 • SRK-T-098 11.2 Interface kit (SC-BIKN-E) RKZ012A088 Before use, please read these Safety Precautions thoroughly Safety precautions before installation. ●All the cautionary items mentioned below are important safety related items to be taken Accessories included in package into consideration, so be sure to observe them at all times. Be sure to check all the accessories included in package.

  • Page 97: Installation Of The Interface

    '10 • SRK-T-098 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 98: Functions Of Cnt Connector

    '10 • SRK-T-098 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. 0.3 mm (Keep the distance between the relay and the CNT terminal within 2 m.)

  • Page 99: Connection Of Wired Remote Controller

    '10 • SRK-T-098 Connection of wired remote controller Regarding the connection of wired remote controller, refer to the instruction manual of wired remote controller. ①Switch ON the DIP switch SW2-2 (Factory setting : ON) on the interface PCB. DIP suitch Caution:Wireless remote controller attached to the indoor unit can be used in parallel, after connecting the wired remote controller.

  • Page 100: Super Link E Board (Sc-Adna-E)

    '10 • SRK-T-098 11.3 Super link E board (SC-ADNA-E) SL2NA-E, and SL3N-AE/BE to control...
  • Page 101 '10 • SRK-T-098...
  • Page 102 Air-Conditioning & Refrigeration Systems Headquarters 16-5, 2-chome, Kounan, Minato-ku, Tokyo, 108-8215, Japan Fax : (03) 6716-5926 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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