SRK-GZ 1.
SRK-GZ CONTENTS 1.1 GENERAL INFORMATION........................................................................ 3 1.1.1 Specific features ................................................................................. 3 1.1.2 How to read the model name ............................................................. 3 1.2 SELECTION DATA .................................................................................... 4 1.2.1 Specifications .........................................................
SRK-GZ 1.1 GENERAL INFORMATION 1.1.1 Specific features The “Mitsubishi Daiya” room air-conditioner: SRK series are of split and wall mounted type and the unit consists of indoor unit and outdoor unit with refrigerant precharged in factory. The indoor unit is composed of room air cooling or heating equipment with operation control switch and the outdoor unit is composed of condensing unit with compressor.
SRK-GZ 1.2 SELECTION DATA 1.2.
SRK-GZ Model SRK35GZ-L1 (Indoor unit) SRC35GZ-L1 (Outdoor unit) Model SRK35GZ-L1 Item Refrigerant piping Operation data(1) Cooling capacity(1) Heating capacity(1) Power source Cooling input Running current (Cooling) Heating input Running current (Heating) Inrush current COP (Cooling) Noise level Exterior dimensions Height × Width × Depth Color Net weight Refrigerant equipment Compressor type & Q’ty Motor Starting method Heat exchanger Refrigerant control Refrigerant(4) Refrigerant oil Deice control Air
SRK-GZ Model SRK502Z-L (Indoor unit) SRC502Z-L (Outdoor unit) Model SRK502Z-L Item Refrigerant piping Operation data(1) Cooling capacity(1) Heating capacity(1) Power source Cooling input Running current (Cooling) Heating input Running current (Heating) Inrush current COP (Cooling) Noise level Exterior dimensions Height × Width × Depth Color Net weight Refrigerant equipment Compressor type & Q’ty Motor Starting method Heat exchanger Refrigerant control Refrigerant(4) Refrigerant oil Deice control Air ha
SRK-GZ 1.2.2 Range of usage & limitations (1) Inlet air temperature (a) (b) Heating operation Cooling operation JIS-Cooling Indoor air temp. ºC D.B. Outdoor air temp. ºC D.B. Applicable temp. range Applicable temp. range JIS-Heating Indoor air temp. ºC W.B. Note: The chart is the result from the continuous operation under constant air temperature conditions, however, excludes the initial pull-down stage. Outdoor air temp. ºC W.B.
SRK-GZ 1.2.3 Exterior dimensions (1) Indoor unit Model SRK25GZ-L1 Unit: mm A 178 Room temp. thermistor 750 3 9 250 56 Piping hole right (left) 49 615 75 450 150 236.5 19 15 9 46 150 Terminal block 117 75 16 60 746.9 40 4.5 92 36 36 Remote controller 7.5 62 62 7.5 Piping for Gas (Ø9.52) 370 40 Piping hole (Ø65) 37 Piping for Liquid (Ø6.35) 420 Piping hole (Ø65) VIEW A Model SRK35GZ-L1 Unit: mm A 790 174 3 Room temp.
SRK-GZ Model Unit: mm SRK502Z-L Remote controller (2) Outdoor unit Model SRC25GZ-L1 50 Unit: mm 13.5 12 44 274.5 245 42 Drain holes 300 192.5 23 12 372.5 82.5 480 645 82.5 2-Ø12 61.5 Terminal block 33.3 Service valve (Liquid) Flare connecting Ø6.35 (1/4˝) 39.7 540 127.7 100.3 14.4 40˚ 40˚ Service valve (Gas) Flare connecting Ø9.
SRK-GZ Model SRC35GZ-L1 50 55 Unit : mm MAX.80 23 14 44 65 93 255 272 58 22 14 Drain holes 265 795 542 539 32 40 413 Terminal block 115 45° 45° 16 12 (Oval holes) for unit fixing 65 2 places 15 44 50 58 14 Model 272 300 14 Drain holes 142.5 510 142.5 33 Service Valve (Liquid) Flare connecting Ø6.35 (1/4¨) Service Valve (Gas) Flare connecting Ø12.
SRK-GZ 1.2.4 Piping system Model SRK25GZ-L1 Indoor unit Outdoor unit Cooling cycle Heating cycle Flare connecting Piping (Gas) ø9.52 Service valve (Gas) Outdoor air temp. thermistor Check joint 4 way valve Accumulator Room temp. thermistor Discharge temp. thermistor Heat exchanger thermistor Heat exchanger Heat exchanger Compressor Piping (Liquid) ø6.
SRK-GZ Model SRK502Z-L 1.3 ELECTRICAL DATA 1.3.1 Electrical wiring Meaning of marks Symbol CFI Parts name Capacitor for FMI Symbol RE Parts name Reactor Symbol Tr Parts name Transformer CM Compressor motor SM Flap motor ZNR Varistor F1,2 Fuse Th1 Room temp.
White Violet Yellow/Green WH V Y/GN Yellow Y Red Light blue LB Gray Brown BR RD Blue BL GY Black BK Color symbol SM Y WH RD BK BR FMI WH LB CNM CNU CNW Y/GN Y/GN Power source 1 phase 220/240V 50Hz CFI Display Wireless R-Amp CNE CNC Tr CNB F1 (250V 3.
White Violet Yellow/Green WH V Y/GN Yellow Y Red Light blue LB Gray Brown BR RD Blue BL GY Black BK Color symbol SM Y WH RD BK BR FMI WH LB CNM CNU CNW Y/GN Y/GN Power source 1 phase 220/240V 50Hz CFI Display CNE CNC Tr Wireless R-Amp CND CNB F1 (250V3.
Light blue White Yellow/Green Y/GN Red RD LB Yellow Y WH Blue Brown BL Black BR BK Colorsymbol SM FMI BL Y WH BK RD CNE ( Display ) CNH 52C J Th3 CNF Th2 Th1 CNG Printed circuit board ZNR S Back up switch 52C-3 F 250V 3.
SRK-GZ 1.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Remote control switch Remote control switch Models All models HI POWER operation indicator Indicators during HI POWER operation. FAN SPEED indicator ECONOMY operation indicator Indicators the ¡ for the fan speed which has been set. Indicators during ECONOMY operation. Operation switch over indicator Indicators the ¡ for the operation which has been set. ON-TIMER • OFF-TIMER indicator AIR FLOW indicator Indicates selected flap mode.
SRK-GZ Model SRK35GZ-L1 RUN (HOT KEEP) lamp (green) TIMER • Illuminates during operation. • Flashing at stop blowing due to the hot keep. RUN TIMER lamp (yellow) Illuminates during TIMER operation. SRK35GZ Model SRK502Z-L RUN (HOT KEEP) lamp (green) TIMER lamp (yellow) Illuminates during TIMER operation. • Illuminates during operation. • Flashing at stop blowing due to the hot keep. RUN HI POWER TIMER ECONO HI POWER lamp (green) ECONOMY lamp (orange) Illuminates during HI POWER operation.
SRK-GZ (3) Flap control Control the flap by AIRFLOW button on the wireless remote control. (a) Natural flow (AUTO) The flap will be automatically set to the angle of air flow best to operation. (i) Starting time of operation Models SRK25GZ-L1, 35GZ-L1 In case of heating s operation t In case of cooling s and dry operation t Sway operation Stops at the level position for one minute. Sway operation Flap stops 3’50” on this position.
SRK-GZ (4) Comfort timer setting 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 comfort timer starts and determines the starting time of next operation based on the initial value of 15 minutes and the relationship between the room temperature at the setting time (temperature of room temperature sensor) and the setting temperature. (Max.
SRK-GZ (iii) Continuous mode operation (Temperature setting button on remote controller: Continuous) Model Item SRK25GZ-L1 AUTO Inverter frequency HI 104Hz Indoor fan 6th speed SRK35GZ-L1 MED LO AUTO 98Hz 50Hz 98Hz 5th speed 4th speed Outdoor fan HI 7th speed ON SRK502Z-L MED LO AUTO 94Hz 58Hz HI 144rps 5th speed 3rd speed ON MED LO 110rps 50rps 8th speed 7th speed 5th speed 5th speed 4th speed 2nd speed Notes (1) In the continuous mode, the continuous heating operation i
SRK-GZ (v) Defrosting operation S Models SRK25GZ-L1, 35GZ-L1 1) Starting conditions (Defrosting operation can be started only when all of the following conditions are met.) ¡ Model SRK25GZ-L1 1 After start of heating operation → When it elapsed 40 minutes. (Accumulated operation time) 2 After end of defrosting operation → When it elapsed 40 minutes.
SRK-GZ S Model SRK502Z-L 1) Starting conditions (Defrosting operation can be started only when all of the following conditions are met.) 1 After start of heating operation → When it elapsed 60 minutes. (Accumulated operation time) 2 After end of defrosting operation → When it elapsed 60 minutes. (Accumulated compressor operation time) 3 Outdoor unit heat exchanger thermistor (Th5) temperature → When the temperature has been below –2ºC for 3 minutes continuously.
SRK-GZ (6) Outline of cooling operation (a) Air capacity selection (i) Frequency of inverter changes within the range of selected air flow. Model SRK25GZ-L1 Air flow selection AUTO Frequency Air flow Frequency Air flow LO 34~102Hz 18~118rps Depends on frequency.
SRK-GZ (b) Outline of control (i) Cooling oriented dehumidifying S SRK25, 35GZ-L1 Room temperature is checked at 3-minute intervals after selecting the cooling or heating oriented dehumidifying in order to determine the operation range. Operation range D C Low B –1 A 0 +2 Hight Room temperature – Setting temperature (deg) Operating pattern D range C range B range A range 25 : 48 35 : 50 36 Inverter frequency 34 0 4th speed 2nd speed Indoor fan 1st speed OFF 20 sec.
SRK-GZ (ii) Heating oriented dehumidifying After interrupting the compressor operation for 3 minutes (by the 3-minute timer) following the determination of heating oriented dehumidifying, the unit enters in the heating operation. If the room temperature exceeds the setting temperature by 2ºC or more, the unit checks the room temperature at 3-minute intervals and, depending on the result, determines the range of heating oriented dehumidifying operation.
SRK-GZ (9) Economical operation (ECONO button on remote controller: ON) Pressing the economy button initiates a soft operation with the power suppressed in order to avoid an excessive cooling or heating. The unit operates 1.5ºC higher than the setting temperature for the LO air flow during cooling or 2.5ºC lower than that during heating.
SRK-GZ (g) Cooling overload protective control (i) Operating conditions: When the unit is operating with the outdoor unit frequency other than 0 Hz(rps) or when the outdoor temperature sensor temperature rose beyond 41ºC for 2 minutes continuously. (ii) Detail of operation S SRK25GZ-L1 1) Indoor fan speed is raised forcibly by 1 step. However, the maximum speed is the 3rd speed.
SRK-GZ (k) High pressure control (i) Purpose: Prevents abnormally high pressure operation during heating. (ii) Detector: Indoor unit heat exchanger thermistor (Th2) (iii) Detail of operation: (Example) Fuzzy 8 Hz (8 rps) (1), After lapse of 6 min. or over (3) After lapse of 6 min. or over (3) After lapse of 6 min. or over (3) (4) 8 Hz (8 rps) Lower limit frequency 34 Hz 0 Hz (30 rps) 55 Indoor unit heat exchanger temperature (˚C) 47.5 (49.
SRK-GZ S SRK502Z-L When stopped by indoor unit controller Function Operation Inverter frequency (Command frequency) 0 Indoor fan (Frequency dependent) OFF Indoor power relay ON Outdoor fan 4-way valve Heating, heating oriented dehumidifying Cooling, cooling oriented dehumidifying 3 min.(1) 3 min.(1) When stopped or reset by outdoor unit protective function Heating, heating oriented dehumidifying 2 min. 55 sec. Cooling, cooling oriented dehumidifying 2 min. 55 sec.
SRK-GZ 1.5 APPLICATION DATA SAFETY PRECAUTIONS ¡ Please read these “Safety Precautions” first then accurately execute the installation work. ¡ Though the precautionary points indicated herein are divided under two headings, WARNING and CAUTION , those points which are related to the strong possibility of an installation done in error resulting in death or serious injury are listed in the WARNING section.
SRK-GZ 1.5.1 Selection of location for installation (1) Indoor unit (a) Where there is no obstructions to the air flow and where the cooled air can be evenly distributed. (b) A solid place where the unit or the wall will not vibrate. (c) A place where there will be enough space for servicing. (Where space 4 cm mentioned below can be secured) Right side Left side 10 cm 5 cm (d) Where wiring and the piping work will be easy to conduct.
SRK-GZ 1.5.2 Installation of indoor unit (1) Installation of installation board (a) Fixing of installation board Lock for the inside wall structures (Intermediate support or pillar) and fairly install the unit after level surface has been checked. Adjustment of the installation board in the horizontal direction is to be conducted with four screws in a temporary tightened state. Tapping Screws Standard hole Adjust so that board will be level by turning the board with the standard hole as the center.
SRK-GZ (3) Preparation of indoor unit (a) Mounting of connecting wires S SRK25, 35GZ-L1 (i) Remove lid (ii) Remove cover, terminal block cover Earth Wiring Terminal Terminal Block Wiring Clamp Connecting Wiring (iii) Insert connecting wire to terminal block securely. 1 Insert connecting wire up to the terminal block securely.
SRK-GZ ¡ When arranging the pipe through a hole opened at the center, open the knockout hole using nippers, etc. Chute Wall Note (1) It is designed to collect moisture accumulated on the rear face in the drain pan. Be sure not to accommodate the power cable, etc. above the chute. Pipe accommodation space (4) Installation on indoor unit (a) Install the indoor unit on the mounting plate.
SRK-GZ 1.5.4 Refrigerant piping (1) Preparation Keep the openings of the pipes covered with tapes etc. to prevent dust, sand, etc. from entering them. Outdoor unit side Indoor unit side Dimension A Liquid side (φ6.35): 9-9.5 dia Gas side (φ9.52): 13.2-14 dia (φ12.7): 16.2-17 dia Press (Do not turn) Remove Remove ¡ Remove the flared nuts. (on both liquid and gas sides) ¡ Remove the flared nuts.
SRK-GZ (4) Insulation of connecting portion (a) Cover the connecting portion of the refrigerant piping with the pipe cover and seal them. If neglecting to do so, moisture occurs on the piping and water will drip out. To cover the connecting portion with insulation material materials, cut upper portion and then seal it with insulation materials.
SRK-GZ 1.5.6 Precautions for wireless remote controller installation and operation (1) Wireless remote controller covers the following distances: (a) When operating facing the air conditioner: 6 m or le ss or Wireless remote controller 6 m or less or les s or less Notes (1) The remote controller is correctly facing the sensing element of the air conditioner when being manipulated. (2) The typical coverage is indicated (in the left illustration).
SRK-GZ 1.6 MAINTENANCE DATA 1.6.1 Trouble shooting (1) Trouble shooting to be performed prior to exchanging PCB, (Printed circuit board) [Common to all models] All the models described in this chapter are controlled by a microcomputer. When providing maintenance service to customers it is necessary to understand the function controlled by a micro computer thoroughly, so as not to mistakenly identify correct operations as mis-operations.
RUN lamp 2 time flash RUN lamp ON (1) RUN lamp keeps flashing TIMER lamp ON 3 time flash 3 time flash Note (1) SRK502Z-L only 2 time flash 2 time flash 6 time flash 2 time flash 2 time flash 6 time flash 1 time flash 1 time flash 5 time flash OFF 4 time flash 5 time flash OFF 2 time flash 1 time flash OFF OFF 6 time flash TIMER lamp OFF OFF 1 time flash 2 time flash Outdoor unit LED RUN lamp Rotor lock Serial signal transmission error Compressor overheat Current safe stop
SRK-GZ (3) Inspection procedures corresponding to detail of trouble [Broken thermistor wire, connector poor connection] Thermistor error Is connector connection good? NO Correct connection. YES NO Is thermistor resistance value good? Replace thermistor. YES Replace PCB. Temperature (˚C) Resistance (kΩ) Temperature (˚C) Resistance (kΩ) 0 164 70 8.7 5 127 75 7.3 10 99 80 6.2 15 78 85 5.3 20 62 90 4.5 25 50 95 3.9 30 40 100 3.3 35 32 105 2.9 40 26 110 2.
SRK-GZ [Broken power transistor broken compressor wire] Outdoor unit error NO Is output voltage applied to all 3 phases of power transistor? Defective inverter YES NO Is compressor wiring connected securely? Connect securely. YES Inspect compressor. [Overload operation, compressor lock, overcharge] Current safe stop NO Is refrigerant charge quantity adequate? Discharge refrigerant. YES Is outdoor ventilation condition good? NO Secure space for suction and blow out. YES Inspect compressor.
SRK-GZ [Wiring error including power cable, defective indoor/ outdoor unit PCB, error on power supply system] Serial signal transmission error Does error persist after power reset? NO Trouble by transient cause, not unit trouble. YES Is there any wrong connection on indoor/outdoor unit wiring? NO Correct improper wire connection on indoor/ outdoor unit. YES Is DC 0~Approx. 12V detected between 2~3 terminals on indoor unit terminal block? NO Defective indoor unit PCB YES Is DC 0~Approx.
SRK-GZ (4) Phenomenon observed after shortcircuit, wire breakage on thermistor. (a) Indoor unit Phenomenon Sensor Operation mode Room temperature thermistor Cooling Release of continuous compressor operation command Continuous compressor operation command is not released. Heating Continuous compressor operation command is not released. Release of continuous compressor operation command Heat exchanger thermistor Cooling System can be operated normally.
SRK-GZ (6) Inspection procedures of indoor electrical equipment NO Is fuse (3.15A) blown? Replace fuse. YES Is voltage applied between CNC 1~2 at transformer’s secondary side? (Approx. 12V) NO Notes (1) Since the communication timing signal is transmitted only when the 52C is turned ON, check it under the operating condition. (2) Check the voltage on the terminal block. ¡ Power supply: Between 1~2 (AC 220/240V) ¡ Signal: Between 2~3 (Changing between DC 0~Approx.
RD WH NK F(15A) ◆ Inspection of serial signal Check the voltage between terminals 2~3on the terminal block.(It is normal if the needle swing in the range of DC 0~Approx.12V) ◆ Inspection of input to PCB ¡ Check the voltage between terminals 1~2 on the terminal block. (It is normal if AC220/240V is detected.
RD WH NK F(20A) ◆ Inspection of serial signal Check the voltage between terminals 2~3on the terminal block.(It is normal if the needle swing in the range of DC 0~Approx.12V) ◆ Inspection of input to PCB ¡ Check the voltage between terminals 1~2 on the terminal block. (It is normal if AC220/240V is detected.
Power source 1 Phase 220/240V 50Hz ● Power source and serial signal inspection 1 to 2: AC220/240V 2 to 3: Normal if the voltage oscillates between DC 0 and approx. 12V 3 2 1 CNB } CNE EEV 20S CNB AC.S GY CNA Printed circuit board Fuse 250V 25A S.OUT 52X2-4 AC.R BL ~ ~ DS – + WH Re ● Inspection of electronic expansion valve To test if there is voltage. (Voltage is only applied to the electronic expansion valve when the valve angle is being changed.
SRK-GZ 1.6.2 Servicing (1) Evacuation The evacuation is an procedure to purge impurities......noncondensable gas, air, moisture from the refrigerant equipment by using a vacuum pump. Since the refrigerant R22 is very insoluble in water, even a small amount of moisture left in the refrigerant equipment will freeze, causing what is called water clogging. ¡ Evacuation procedure (a) Check to ensure that there is no internal pressure in the unit.
SRK-GZ 1.6.3 Power supply remote operation When the remote part on indoor unit PCB is modified, the air conditioner is turned ON-OFF by power supply ON-OFF operation without using remote control switch. After the power supply remote operation, the operation contents can be modified by the remote controller.
SRK-GZ MEMO 50
