Mitsubishi Electric SRK25ZSP-W1 Service Manual

Inverter wall mounted type residential air-conditioners (split system, air to air heat pump type)

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SERVICE MANUAL

INVERTER WALL MOUNTED TYPE

RESIDENTIAL AIR-CONDITIONERS

(Split system, air to air heat pump type)

SRK25ZSP-W1

SRK35ZSP-W1

SRK45ZSP-W1

SRK50ZSP-W1

Manual No.'24・SRK-SM-405

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Summary of Contents for Mitsubishi Electric SRK25ZSP-W1

Page 1 Manual No.'24・SRK-SM-405 SERVICE MANUAL INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS (Split system, air to air heat pump type) SRK25ZSP-W1 SRK35ZSP-W1 SRK45ZSP-W1 SRK50ZSP-W1...
Page 2 '24 • SRK-SM-405 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 ........3 (5) High power operation .................
Page 3 '24 • SRK-SM-405 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 Each time the button is pressed, the fan speed changes.
Page 4 '24 • SRK-SM-405 (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 5 '24 • SRK-SM-405 (5) High power operation Pressing the HI POWER/ECONO button intensifies the operating power and initiates powerful cooling or 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 6 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-W1 SRK35ZSP-W1 SRK45, 50ZSP-W1 Fan speed...
Page 7 (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 '24 • SRK-SM-405 Thermostat ON Thermostat OFF Failure Compressor Compressor ON(HOT KEEP)* Indoor fan motor Indoor fan motor...
Page 8 (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-W1 SRK35ZSP-W1 SRK45ZSP-W1 SRK50ZSP-W1 Fan speed...
Page 9 Prevents dewing on the indoor unit. (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-W1 73 rps SRK35ZSP-W1 87 rps SRK45ZSP-W1 87 rps SRK50ZSP-W1...
Page 10 '09•SRK-DB-087D '24 • SRK-SM-405 (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, 50 : 23 rps) Lower limit of compressor speed 0 rps Indoor fan Indoor heat exchanger...
Page 11 '24 • SRK-SM-405 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 12 After lapse of 10 sec. or over 4rps 8rps lower limit After lapse of 10 sec. or over speed 30(35) rps 0rps '24 • SRK-SM-405 Indoor heat exchanger temperature(°C) speed Temperature list ● Temperature list Models DXK09.12 Models SRK25, 35 Unit : ºC RPSmin <...
Page 13 Normal operation '24 • SRK-SM-405 Outdoor air temperature(°C) Reset conditions: ( i ) Heating low outdoor air temperature protective control (i) Protective control I 1) Operating conditions lower for 30 seconds continuously while the compressor 2 (SRK45, 50 : 4) speed is 2) ...
Page 14 '24 • SRK-SM-405 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 15 (q ) Outdoor fan motor protection '24 • SRK-SM-405 ( r ) Outdoor fan control at low outdoor temperature Cooling 1) Operating conditions for 30 seconds continuously while the compressor speed is 2) Detail of operation Outdoor fan 3rd speed Outdoor air temperature >...
Page 16 3) Reset conditions '24 • SRK-SM-405 ( s ) 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, 50 : 5) minutes: Room temperature (Th1)/ Operation mode...
Page 17 '24 • SRK-SM-405 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 18 '24 • SRK-SM-405 (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 19 '24 • SRK-SM-405 (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 20 '24 • SRK-SM-405 (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 21 '24 • SRK-SM-405 *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 22 '24 • SRK-SM-405 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 23 '09•SRK-DB-087D '24 • SRK-SM-405 (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 Power source is faulty. Can not receive signals for 35 When 35 seconds passes without 5 time...
Page 24 '24 • SRK-SM-405 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 25 '24 • SRK-SM-405 (e) Room temperature sensor, indoor heat exchanger temperature sensor, outdoor air temperature sen- sor, outdoor heat exchanger temperature sensor 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 26 '24 • SRK-SM-405 (f) Discharge pipe temperature senson 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 27 '24 • SRK-SM-405 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 Cooling Room temperature sensor temperature on previous occasion...
Page 28 '24 • SRK-SM-405 (7) Inspection procedures corresponding to detail of trouble Sensor error Broken sensor wire, connector poor connection Sensor temperature characteristics (Room Discharge pipe temperature sensor characteristics temperature, indoor heat exchanger temperature, outdoor heat exchanger temperature, outdoor air temperature) Temperature (˚C) Temperature (˚C) Indoor fan motor error Defective fan motor, connector poor...
Page 29 '09•SRK-DB-087D '24 • SRK-SM-405 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 Check resistance between terminals . SRC25, 35 : 2.568Ω...
Page 30 '09•SRK-DB-087D '24 • SRK-SM-405 Over heat of compressor Gas shortage, defective discharge pipe temperature sensor Is discharge pipe temperature. sensor temperature sensor unit Error of signal transmission Wiring error including power cable, defective indoor/ outdoor unit PCB ② ③ unit ②...
Page 31 '09•SRK-DB-087D '24 • SRK-SM-405 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 ◆ (1) unit operation Notes (1) unit Check resistance between terminals, see page 28.
Page 32 '24 • SRK-SM-405 Rotor lock Defective compressor, defective outdoor unit PCB unit Check resistance between terminals. See page 28. (8) Phenomenon observed after short-circuit, wire breakage on sensor (a) Indoor unit Phenomenon Operation Sensor mode Short-circuit Disconnected wire Cooling Room temperature sensor Heating Cooling...
Page 33 Cooling Heat exchanger temperature sensor Heating operation Defrost operation is performed for 10 minutes at approx. 35 (model SRK35:45) minutes. Cooling Ourdoor air '24 • SRK-SM-405 temperature sensor Heating operation Defrost operation is performed for 10 minutes at approx. 35 (model LSRK35:45) minutes. Discharge pipe All modes temperature sensor...
Page 34 '24 • SRK-SM-405 (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 35 '24 • SRK-SM-405 (11) Outdoor unit inspection points Models SRC25ZSP-W1, 35ZSP-W1 ◆Check point of outdoor unit WARNING- 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 36 '24 • SRK-SM-405 Models SRC45ZSP-W1, 50ZSP-W1 ◆Check point of outdoor unit WARNING- HIGH VOLTAGE High voltage is produced in the control box. Don't touch ◆Power source and serial signal inspection electrical parts in the control box for 5 minutes after the unit is stopped.
Page 37 '24 • SRK-SM-405 (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 38 '24 • SRK-SM-405 (12) Fuse list Models SRK25ZSP-W1, SRK35ZSP-W1, SRK45ZSP-W1, SRK50ZSP-W1 Fuse position Parts that may fail Fuse only replaceable when the fuse is blown(*1) Group Details Ref No. · Indoor unit Switching power source primary side Fan motor (*1) This shows the parts being powered through the fuse.
Page 39 '24 • SRK-SM-405 Models SRC25ZSP-W1, SRC35ZSP-W1 Fuse position Parts that may fail Fuse only replaceable when the fuse is blown(*1) Group Details Ref No. · Outdoor unit Control box Main circuit Outdoor unit terminal block sheet metal primary side Reactor Switching power ·...
Page 40 '24 • SRK-SM-405 Models SRC45ZSP-W1, SRC50ZSP-W1 Fuse position Parts that may fail Fuse only replaceable when the fuse is blown(*1) Group Details Ref No. · Outdoor unit Control box Main circuit Outdoor unit terminal block sheet metal primary side Reactor Switching power ·...
Page 41 '24 • SRK-SM-405 3. ELECTRICAL WIRING (1) Indoor units Models SRK25ZSP-W1, 35ZSP-W1, 45ZSP-W1, 50ZSP-W1 RLC000Z116...
Page 42 '24 • SRK-SM-405 (2) Outdoor units Models SRC25ZSP-W1, 35ZSP-W1 RWC000Z357...
Page 43 '24 • SRK-SM-405 Models SRC45ZSP-W1, 50ZSP-W1 RWC000Z358...
Page 44 '24 • SRK-SM-405 4. PIPING SYSTEM Model SRK25ZSP-W1 Outdoor air temperature sensor Discharge pipe temperature sensor Heat Room exchanger temperature temperature sensor sensor Heat exchanger Heat exchanger temperature sensor Muffler Muffler Model SRK35ZSP-W1 Outdoor air temperature sensor Discharge pipe temperature sensor...
Page 45 '24 • SRK-SM-405 Model SRK45ZSP-W1, 50ZSP-W1 Outdoor air temperature sensor Discharge pipe temperature sensor Heat Room exchanger temperature temperature sensor sensor Heat exchanger temperature sensor...
Page 46 INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. 2-3, Marunouchi 3-chome, Chiyoda-ku, Tokyo, 100-8332, Japan MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. http://www.mhi-mth.co.jp/en/ 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-w1 Srk45zsp-w1 Srk50zsp-w1