Mitsubishi SRK25ZSP-W Service Manual
  1. Manuals
  2. Brands
  3. Mitsubishi Manuals
  4. Air Conditioner
  5. SRK25ZSP-W
  6. Service manual

Mitsubishi SRK25ZSP-W Service Manual

Inverter wall mounted type residential air-conditioners (split system, air to air heat pump type)
Hide thumbs Also See for SRK25ZSP-W:
Table of Contents

Advertisement

Quick Links

SERVICE MANUAL
INVERTER WALL MOUNTED TYPE
RESIDENTIAL AIR-CONDITIONERS
(Split system, air to air heat pump type)
SRK25ZSP-W
SRK35ZSP-W
SRK45ZSP-W
Manual No.'18 • SRK-SM-259

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the SRK25ZSP-W and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Mitsubishi SRK25ZSP-W

Summary of Contents for Mitsubishi SRK25ZSP-W

  • Page 1 Manual No.'18 • SRK-SM-259 SERVICE MANUAL INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS (Split system, air to air heat pump type) SRK25ZSP-W SRK35ZSP-W SRK45ZSP-W...

  • Page 3: Table Of Contents

    '18 • SRK-SM-259 CONTENTS 1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ....2 (1) Operation control function by wireless remote control ......2 (2) Unit ON/OFF button ................. 3 (3) Auto restart function ................. 3 (4) Installing two air-conditioners in the same room ........

  • Page 4: Outline Of Operation Control By Microcomputer

    '18 • SRK-SM-259 1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Operation control function by wireless remote control Remote control ◆ Operation section FAN SPEED button OPERATION MODE select button Each time the button is pressed, the fan Each time the button is pressed, the speed changes.

  • Page 5: Unit On/Off Button

    '18 • SRK-SM-259 (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. (a) Operation Push the button once to place the unit in the automatic mode. Push it once more to turn the unit off. (b) Details of operation The unit will go into the automatic mode in which it automatically determines, from room temperature (as detected by sensor), whether to go into the COOL, DRY or Heat modes.

  • Page 6: High Power Operation

    '18 • SRK-SM-259 (5) High power operation Pressing the HI POWER/ECONO button intensifies the operating power and initiates powerful cooling and heating operation for 15 minutes continuously. The wireless remote control displays HIGH POWER mark and the FAN SPEED display disappears. (a) During the HIGH POWER operation, the room temperature is not controlled.

  • Page 7: Timer Operation

    (i) Fuzzy operation Deviation between the room temperature setting correction temperature and the suction air temperature is calculated in accordance with the fuzzy rule, and used for control of the air capacity and the compressor speed. Model SRK25ZSP-W SRK35ZSP-W SRK45ZSP-W Fan speed...
  • Page 8 (9) Outline of heating operation (a) Operation of major functional components in heating mode (a) Operation of major functional components in heating mode Heating Heating Thermostat ON Thermostat OFF Failure '18 • SRK-SM-259 Thermostat ON Thermostat OFF Failure Compressor Compressor ON(HOT KEEP)* Indoor fan motor Indoor fan motor...

  • Page 9: Outline Of Cooling Operation

    (b) Detail of control in each mode (Pattern) (i) Fuzzy operation During the fuzzy operation, the air flow and the compressor speed are controlled by calculating the difference between the room temperature setting correction temperature and the suction air temperature. Model SRK25ZSP-W SRK35ZSP-W SRK45ZSP-W Fan speed 15-74rps...

  • Page 10: Protection Control Function

    (i) Operating conditions When the following conditions have been satisfied. 1) Humidity is 78% or higher. (ii) Contents of operation Maximum compressor speed 68 rps SRK25ZSP-W 73 rps SRK35ZSP-W 87 rps SRK45ZSP-W (iii) Reset condition When either of the following condition is satisfied.
  • Page 11 '09•SRK-DB-087D '18 • SRK-SM-259 (c) Frost prevention control (i) Operating conditions compressor speed (ii) Detail of anti-frost operation Lower limit Indoor heat exchanger temperature 5°C or lower 2.5°C or lower speed Item 22rps (SRK45 : 23 rps) Lower limit of compressor speed 0 rps Indoor fan Indoor heat exchanger...
  • Page 12 '18 • SRK-SM-259 Notes (1) When the outdoor heat exchanger temperature is in the range of B-C ºC, the speed is reduced by 8 rps at each 20 seconds. (2) When the temperature is C ºC or higher, the compressor is stopped. (3) When the outdoor heat exchanger temperature is in the range of A-B ºC, if the compressor speed is been maintained and the operation has continued for more than 20 seconds at the same speed, it returns to the normal cooling operation.
  • Page 13 After lapse of 10 sec. or over 4rps 8rps lower limit After lapse of 10 sec. or over speed 30(35) rps 0rps '18 • SRK-SM-259 Indoor heat exchanger temperature(°C) speed Temperature list ● Temperature list Models DXK09.12 Models SRK25, 35 Unit : ºC RPSmin <...
  • Page 14 Normal operation '18 • SRK-SM-259 Outdoor air temperature(°C) Reset conditions: (i) Heating low outdoor temperature protective control (i) Protective control I 1)  Operating conditions   lower 2 (-8) 2)   Detail of operation    changed as shown in the figure below. Models SRK25, 35 Model SRK45 Lower limit 45(55) rps...
  • Page 15 '18 • SRK-SM-259 2) If the temperature of 110ºC is detected by the sensor on the discharge pipe, then the compressor will stop immediately. When the discharge pipe temperature drops and 3 minutes has elapsed, the unit starts again within 1 hour but there is no start at the third time.
  • Page 16 (q) Outdoor fan motor protection '18 • SRK-SM-259 (r) Outdoor fan control at low outdoor temperature Cooling 1) Operating conditions 2) Detail of operation Outdoor fan Outdoor temperature > 10˚C Outdoor temperature < = 10˚C 3) Reset conditions (ii) Heating 1) Operating conditions (model SRK45:0 2) Detail of operation...
  • Page 17 Values in ( ) are for the model SRK35. 3) Reset conditions '18 • SRK-SM-259 (model SRK45:2 Refrigeration cycle system protection (i) Starting conditions When 5 minutes have elapsed after the compressor ON or the completion of the defrost operation Other than the defrost operation 3) When, after satisfying the conditions of 1) and 2) above, the compressor speed, indoor air temperature (Th1) and indoor heat exchanger temperature (Th2) have satisfied the conditions in the following table for 10 (SRK45:5) minutes:...

  • Page 18: Maintenance Data

    '18 • SRK-SM-259 2. MAINTENANCE DATA (1) Cautions (a) If you are disassembling and checking an air-conditioner, be sure to turn off the power before beginning. When working on indoor units, let the unit sit for about 1 minute after turning off the power before you begin work. When working on an out- door 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 10 V or lower).

  • Page 19: Troubleshooting Procedure (If The Air-Conditioner Runs)

    '18 • SRK-SM-259 (4) Troubleshooting procedure (If the air-conditioner runs) Confirm the contents of the customer complaint. The cause of the trouble can be specifically identified. Check the self-diagnosis display. Eliminate the cause of the trouble and perform an operation check. See page 18.

  • Page 20: Self-Diagnosis Table

    '18 • SRK-SM-259 (5) Self-diagnosis table When this air-conditioner performs an emergency stop, the reason why the emergency stop occurred is displayed by the flash- ing of display lights. If the air-conditioner is operated using the wireless remote control 3 minutes or more after the emergen- cy stop, the trouble display stops and the air-conditioner resumes operation.

  • Page 21: Service Mode (Trouble Mode Access Function)

    '18 • SRK-SM-259 (6) Service mode (Trouble mode access function) This air-conditioner is capable of recording error displays and protective stops (service data) which have occurred in the past. If self-diagnosis displays cannot be confirmed, it is possible to get a grasp of the conditions at the time trouble oc- curred by checking these service data.
  • Page 22 '18 • SRK-SM-259 *3: To count the number of flashes in the service mode, count the number of flashes after the light lights up for 1.5 second initially (start signal). (The time that the light lights up for 1.5 second (start signal) is not counted in the number of flashes.) •...
  • Page 23 '18 • SRK-SM-259 ② Stop data Remote control setting Displayed data Operation Fan speed Temperature switching switching setting 21ºC Displays the reason for the stop (stop code) the previous time when the air-conditioner was stopped by protective stop control. 22ºC Displays the reason for the stop (stop code) 2 times previous when the air-conditioner was stopped by protective stop control.
  • Page 24 '09•SRK-DB-087D '18 • SRK-SM-259 (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 source is faulty.
  • Page 25 '18 • SRK-SM-259 Notes (1) The number of flashes when in the service mode do not include the 1.5 second period when the lights light up at first (start signal). (See the ex- ample shown below.) • In the case of current cut (example: stop code “42”) The RUN light (10’s digit) flashes 4 times and the TIMER light (1’s digit) flashes 2 times.
  • Page 26 '18 • SRK-SM-259 (e) Room temperature sensor temperature, indoor heat exchanger sensor temperature, outdoor air tem- perature sensor temperature, outdoor heat exchanger sensor temperature table Unit: ºC TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) * If no data are recorded (error code is normal), the display for each sensor becomes as shown below.
  • Page 27 '18 • SRK-SM-259 (f) Discharge pipe temperature table Unit: ºC TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) * If no data are recorded (error code is normal), the display for sensor becomes as shown below. Sensor value displayed when the error code is normal Sensor name -64ºC...
  • Page 28 '18 • SRK-SM-259 Service data record form Model Customer Date of investigation Machine name Content of complaint Display results Remote control settings Display content Content of displayed data Temperature setting Operation switching Fan speed switching Buzzer (Yes/No.) RUN light (Times) TIMER light (Times) Error code on previous occasion.

  • Page 29: Inspection Procedures Corresponding To Detail Of Trouble

    '18 • SRK-SM-259 (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 30 '09•SRK-DB-087D '18 • SRK-SM-259 Current cut Compressor lock, Compressor wiring short circuit, Compressor output is open phase, Outdoor unit PCB is faulty, Service valve is closed, EEV is faulty, Compressor faulty. unit ＊   unit ＊ unit SRC25, 35 : 4.428Ω (U-V, V-W, U-W) or more at 20ºC SRC45 : 1.728Ω...
  • Page 31 '09•SRK-DB-087D '18 • SRK-SM-259 Over heat of compressor Gas shortage, defective discharge pipe sensor unit Error of signal transmission Wiring error including power cable, defective indoor/ outdoor unit PCB ② ③ unit ② ③ unit ① ② unit...
  • Page 32 '09•SRK-DB-087D '18 • SRK-SM-259 Trouble of outdoor unit Insufficient refregerant amount, Faulty power transistor, Broken compressor wire Service valve close, Defective EEV, Defective outdoor unit PCB source source source source unit ◆  unit (1)      operation   Notes (1) unit wire Check coil wire resistance, see page 28.

  • Page 33: Phenomenon Observed After Short-Circuit, Wire Breakage On Sensor

    '18 • SRK-SM-259 Rotor lock Defective compressor, defective Rotor lock Defective compressor, defective outdoor unit PCB outdoor unit PCB unit unit See page 28. See page 28. (8) Phenomenon observed after short-circuit, wire breakage on sensor (8) Phenomenon observed after short-circuit, wire breakage on sensor (a) Indoor unit (a) Indoor unit Phenomenon...

  • Page 34: Checking The Indoor Electrical Equipment

    Cooling Heat exchanger sensor operation Defrost operation is performed for 10 minutes at approx. 35 (model SRC35:45) minutes. Heating Cooling Ourdoor air '18 • SRK-SM-259 temperature sensor operation Defrost operation is performed for 10 minutes at approx. 35 (model SRC35:45) minutes. Heating Discharge pipe All modes...

  • Page 35: How To Make Sure Of Wireless Remote Control

    '18 • SRK-SM-259 (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 36: Outdoor Unit Inspection Points

    '18 • SRK-SM-259 (11) Outdoor unit inspection points Models SRC25ZSP-W, 35ZSP-W...
  • Page 37 '18 • SRK-SM-259 Model SRC45ZSP-W...
  • Page 38 '18 • SRK-SM-259 (a) Inspection of electronic expansion valve Electronic expansion valve operates for approx. 10 seconds after the power on, in order to determine its aperture. Check the operating sound and voltage during the period of time. (Voltage cannot be checked during operation in which only the aperture change occurs.) (i) If it is heard the sound of operating electronic expansion valve, it is almost normal.

  • Page 39: Electrical Wiring

    '18 • SRK-SM-259 3. ELECTRICAL WIRING (1) Indoor units Models SRK25ZSP-W, 35ZSP-W, 45ZSP-W RLC000Z107...

  • Page 40: Outdoor Units

    '18 • SRK-SM-259 (2) Outdoor units Models SRK25ZSP-W, 35ZSP-W RWC000Z324...
  • Page 41 '18 • SRK-SM-259 Model SRC45ZSP-W RWC000Z325...

  • Page 42: Piping System

    '18 • SRK-SM-259 4. PIPING SYSTEM Models SRK25ZSP-W, 35ZSP-W Discharge pipe temp. sensor Heat exchanger sensor Heat exchanger SRK25ZSP-W Capillary tube only Strainer SRK35ZSP-W Capillary tube only Model SRK45ZSP-W...
  • Page 43 MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. 16-5 Konan 2-chome, Minato-ku, Tokyo, 108-8215, Japan http://www.mhi-mth.co.jp/en/ Because of our policy of continuous improvement, we reserve the right to make changes in all specifications without notice. Copyright MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.

This manual is also suitable for:

Srk35zsp-wSrk45zsp-w

Table of Contents

Save PDF