Mitsubishi Heavy Industries SRK25ZXA-S Technical Manual
  1. Manuals
  2. Brands
  3. Mitsubishi Heavy Industries Manuals
  4. Air Conditioner
  5. SRK25ZXA-S
  6. Technical manual

Mitsubishi Heavy Industries SRK25ZXA-S Technical Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

TECHNICAL MANUAL
INVERTER WALL MOUNTED TYPE
RESIDENTIAL AIR-CONDITIONERS
(Split system, air to air heat pump type)
SRK25ZXA-S
SRK25ZXA-SB / SRC25ZXA-S
SRK25ZXA-SS / SRC25ZXA-S
SRK25ZXA-SR / SRC25ZXA-S
SRK35ZXA-S
SRK35ZXA-SB / SRC35ZXA-S
SRK35ZXA-SS / SRC35ZXA-S
SRK35ZXA-SR / SRC35ZXA-S
/ SRC25ZXA-S
/ SRC35ZXA-S

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the SRK25ZXA-S and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Mitsubishi Heavy Industries SRK25ZXA-S

Summary of Contents for Mitsubishi Heavy Industries SRK25ZXA-S

  • Page 1 TECHNICAL MANUAL INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS (Split system, air to air heat pump type) SRK25ZXA-S / SRC25ZXA-S SRK25ZXA-SB / SRC25ZXA-S SRK25ZXA-SS / SRC25ZXA-S SRK25ZXA-SR / SRC25ZXA-S SRK35ZXA-S / SRC35ZXA-S SRK35ZXA-SB / SRC35ZXA-S SRK35ZXA-SS / SRC35ZXA-S SRK35ZXA-SR / SRC35ZXA-S...

  • Page 2: Table Of Contents

    '14 • SRK-T-170 CONTENTS 1. SPECIFICATIONS ..................2. EXTERIOR DIMENSIONS ................. 11 (1) Indoor units ..................11 (2) Outdoor units ..................12 (3) Wireless remote control ..............13 3. ELECTRICAL WIRING ................14 (1) Indoor units ..................14 (2) Outdoor units ..................
  • Page 3 '14 • SRK-T-170 (7) Inspection procedures corresponding to detail of trouble ....55 (8) Phenomenon observed after shortcircuit, wire breakage on sensor ........... 60 (10) How to make sure of wireless remote control ........61 (11) Outdoor unit inspection points .............. 62 How to read the model name Example: SRK 25 Z XA-S/SB/SS/SR...

  • Page 4: Specifications

    '14 • SRK-T-170 1. SPECIFICATIONS Model SRK25ZXA-S SRK25ZXA-S Model Item Indoor unit SRK25ZXA-S Outdoor unit SRC25ZXA-S Power source Single Phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 2.5 (0.9 (Min.) - 4.0 (Max.)) Nominal heating capacity (range) 3.5 (1.1 (Min.) - 4.3 (Max.)) Cooling 0.56 (0.21 - 1.4)
  • Page 5 '14 • SRK-T-170 Model SRK25ZXA-SB SRK25ZXA-SB Model Item Indoor unit SRK25ZXA-SB Outdoor unit SRC25ZXA-S Power source Single Phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 2.5 (0.9 (Min.) - 4.0 (Max.)) Nominal heating capacity (range) 3.5 (1.1 (Min.) - 4.3 (Max.)) Cooling 0.56 (0.21 - 1.4) Power...
  • Page 6 '14 • SRK-T-170 Model SRK25ZXA-SS SRK25ZXA-SS Model Item Indoor unit SRK25ZXA-SS Outdoor unit SRC25ZXA-S Power source Single Phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 2.5 (0.9 (Min.) - 4.0 (Max.)) Nominal heating capacity (range) 3.5 (1.1 (Min.) - 4.3 (Max.)) Cooling 0.56 (0.21 - 1.4) Power...
  • Page 7 '14 • SRK-T-170 Model SRK25ZXA-SR SRK25ZXA-SR Model Item Indoor unit SRK25ZXA-SR Outdoor unit SRC25ZXA-S Power source Single Phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 2.5 (0.9 (Min.) - 4.0 (Max.)) Nominal heating capacity (range) 3.5 (1.1 (Min.) - 4.3 (Max.)) Cooling 0.56 (0.21 - 1.4) Power...
  • Page 8 '14 • SRK-T-170 Model SRK35ZXA-S SRK35ZXA-S Model Item Indoor unit SRK35ZXA-S Outdoor unit SRC35ZXA-S Power source Single Phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 3.5 (0.9 (Min.) - 4.6 (Max.)) Nominal heating capacity (range) 4.5 (1.1 (Min.) - 5.0 (Max.)) Power Cooling 0.860 (0.21 - 1.45)
  • Page 9 '14 • SRK-T-170 Model SRK35ZXA-SB SRK35ZXA-SB Model Item Indoor unit SRK35ZXA-SB Outdoor unit SRC35ZXA-S Power source Single Phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 3.5 (0.9 (Min.) - 4.6 (Max.)) Nominal heating capacity (range) 4.5 (1.1 (Min.) - 5.0 (Max.)) Power Cooling 0.860 (0.21 - 1.45)
  • Page 10 '14 • SRK-T-170 Model SRK35ZXA-SS SRK35ZXA-SS Model Item Indoor unit SRK35ZXA-SS Outdoor unit SRC35ZXA-S Power source Single Phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 3.5 (0.9 (Min.) - 4.6 (Max.)) Nominal heating capacity (range) 4.5 (1.1 (Min.) - 5.0 (Max.)) Power Cooling 0.860 (0.21 - 1.45)
  • Page 11 '14 • SRK-T-170 Model SRK35ZXA-SR SRK35ZXA-SR Model Item Indoor unit SRK35ZXA-SR Outdoor unit SRC35ZXA-S Power source Single Phase, 220 - 240V, 50Hz Nominal cooling capacity (range) 3.5 (0.9 (Min.) - 4.6 (Max.)) Nominal heating capacity (range) 4.5 (1.1 (Min.) - 5.0 (Max.)) Power Cooling 0.860 (0.21 - 1.45)
  • Page 12 Symbol Content Model 25 9.52 3 8" Flare Gas piping Model 35 12.7 1 2" 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 control Note 1 The model name label is attached...
  • Page 13 Notes Symbol Content 1 It must not be surrounded by walls on the four sides. 25- 9.52 3 8" 2 The unit must be fixed with anchor bolts. An anchor bolt must not Service valve connection gas side 35- 12.7 1 2" Flare protrude more than 15mm.

  • Page 14: Wireless Remote Control

    '14 • SRK-T-170 (3) Wireless remote control Unit: mm...
  • Page 15 Description Item Connector Fan motor Louver motor Flap motor Humidity sensor Room temp. sensor Heat exch. sensor Diode stack Fuse Terminal block Varistor Mark Color Black Blue White Yellow Yellow Green...
  • Page 16 TO INDOOR UNIT POWER WIRES SIGNAL WIRE POWER SOURCE 220-240V 50Hz Power cable, indoor-outdoor connecting wires Item Description Mark Color MAX running current Power cable size Power cable length indoor-outdoor Earth wire size Model wire size x number Compressor motor Black CN20S Connector...

  • Page 17: Indoor Units

    '14 • SRK-T-170 4. NOISE LEVEL Condition ISO-T1,JIS C 9612 Model SRK25ZXA-S/SB/SS/SR Mike position (Indoor Unit) 0.8m Model SRK25ZXA-S/SB/SS/SR Unit Mike position Noise Cooling 37 dB(A) (Center & Low points) Level Heating 37 dB(A) × ..Cooling Heating 1000 2000...
  • Page 18 '14 • SRK-T-170 Model SRK35ZXA-S/SB/SS/SR Condition ISO-T1,JIS C 9612 Mike position (Indoor Unit) Model SRK35ZXA-S/SB/SS/SR 0.8m Unit Noise Cooling 43 dB(A) Mike position (Center & Low points) Level Heating 43 dB(A) × ..Cooling Heating 1000 2000 4000 8000 Mid Octave Band Frequency(Hz) (Outdoor Unit) Mike position: at highest noise level in position as mentioned below ●...

  • Page 19: Piping System

    '14 • SRK-T-170 5. PIPING SYSTEM Models SRK25ZXA-S/SB/SS/SR, 35ZXA-S/SB/SS/SR 　 　 　 　 　 　...

  • Page 20: Range Of Usage & Limitations

    '14 • SRK-T-170 6. RANGE OF USAGE & LIMITATIONS SRK25ZXA-S/SB/SS/SR, 35ZXA-S/SB/SS/SR Net capacity = Capacity shown on specification Correction factors as follows. (1) Coefficient of cooling and heating capacity in relation to temperatures Cooling Heating Applicable range Depends on installed situation Indoor air W.B.
  • Page 21 '14 • SRK-T-170 (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 22: Capacity Tables

    '14 • SRK-T-170 7. CAPACITY TABLES Model SRK25ZXA-S/SB/SS/SR Cooling Mode (kW) Heating Mode(HC) (kW) Indoor air temp Outdoor Indoor air temp Air flow Outdoor Air flow air temp. DB 18 DB 20 DB 22 DB 24 air temp. -15 WB 2.15...

  • Page 23: Application Data

    8. APPLICATION DATA Models SRK25ZXA-S/SB/SS/SR, 35ZXA-S/SB/SS/SR RYD012A245 • While install the unit, be sure to check the selection of installation place, power supply specifications, usage limitation (piping length, height differences WALL TYPE AIR CONDITIONER between indoor and outdoor units, power supply voltage etc.) and installation R410A REFRIGERANT USED spaces.
  • Page 24 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 25 SELECTION OF INSTALLATION LOCATION ① Installation board 6.5 cm minimum (Install at location that meets the following conditions, after getting approval from the customer) from the ceiling Indoor unit ○Where there is no obstructions to the air flow and where the cooled and heated air can be evenly distributed. ○A solid place where the unit or the wall will not vibrate.
  • Page 26 HOW TO RELOCATE OR DISPOSE OF THE UNIT ○In order to protect the environment, be sure to pump down (recovery of refrigerant). ○ Forced cooling operation Turn off power supply. Turn on power supply again after a while. Then, press the ON/OFF ○Pump down is the method of recovering refrigerant from the indoor unit to the outdoor unit button continuously for at least 5 seconds.
  • Page 27 INSTALLATION OF INDOOR UNIT Installation of Installation board Relation between setting plate and indoor unit Fixing of installation board ○Adjustment of the installation board in the horizontal Look for the inside wall structures (Intermediate support or pillar INSTALLATION SPACE (INDOOR UNIT) (FRONT VIEW) direction is to be conducted with four screws in a and firmly install the unit after level surface has been checked.)
  • Page 28 Installing the support of piping Matters of special notice when piping from left or central/rear of the unit. ○ Piping is possible in the rear, left, left rear, left downward, right or downward direction. [Top view] Left-hand-sided piping Right-hand-sided piping Since this air conditioner has Piping in the right rear direction Piping in the left rear direction...
  • Page 29 INSTALLATION OF THE OUTDOOR UNIT Fixing of outdoor Drain piping work Terminal block ○Make sure that the unit is stable in installation. ○Execute drain piping by using a drain elbow and drain grommets supplied Fix the unit to stable base. separately as accessories, where water drained from the outdoor unit is a problem.
  • Page 30 Air purge Insulation of the connection portion Compound pressure gauge Operation valve Pressure gauge ① Tighten all flare nuts in the pipings both indoor and Cover the coupling with insulator and then cover it with Operation valve Gauge manifold outside wall so as not to cause leak. (two-way valve) -0.1MPa (Designed specifically for R410A)

  • Page 31: Outline Of Operation Control By Microcomputer

    '14 • SRK-T-170 9. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Operation control function by remote control Remote control Operation section ON/OFF (luminous) button AIR FLOW (UP/DOWN) button Press to start operation, press again This button changes the air flow to stop.
  • Page 32 '14 • SRK-T-170 (2) Unit ON/OFF button When the remote control batteries become weak, or if the 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 sen- sor), whether to go into the cooling, thermal dry or heating modes.
  • Page 33 '14 • SRK-T-170 (5) Economy operation Pressing the HI POWER/ECONO button initiate a soft operation with the power suppressed in order to avoid an excessive cooling or heating. The unit operate 1.5 higher than the setting temperature during cooling or 2.5 lower than that during heating.
  • Page 34 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 command speed. Model SRK25ZXA-S/SB/SS/SR SRK35ZXA-S/SB/SS/SR Fan speed AUTO...
  • Page 35 '14 • SRK-T-170 (c) Defrosting operation Accumulated compressor operation Temperature ＜ 150 minutes ≧ 150 minutes -5℃ -3.5℃ 7.0℃ 4.0℃ 7.0℃ 6.0℃ ≧ −  ≦  ＜ higher ＜ − − Accumulated compressor operation time 150 minutes Accumulated compressor operation time 150 minutes Defrost operation Defrost operation...
  • Page 36 (i) Fuzzy operation During the fuzzy operation, the air ow and the compressor command speed are controlled by calculating the difference between the room temperature setting correction temperature and the suction air temperature. Model SRK25ZXA-S/SB/SS/SR SRK35ZXA-S/SB/SS/SR Fan speed AUTO 20-106rps...
  • Page 37 '14 • SRK-T-170 (11) Outline of automatic operation (a) Determination of operation mode The unit checks the indoor air temperature and the outdoor air temperature, determines the operation mode, and then begins in the automatic operation. Cooling 27.5 25.5 Dehumidifying Indoor air temperature (˚C) 18.0 Heating...
  • Page 38 1) Compressor's command speed is 32 rps or higher. 2) Detected value of humidity is 68% or higher. (ii) Contents of operation 1) Air capacity control Model SRK25ZXA-S/SB/SS/SR SRK35ZXA-S/SB/SS/SR Item Upper limit of compressor's command speed RangeA: 50rps, RangeB: 50rps RangeA: 55rps, RangeB: 55rps...
  • Page 39 '14 • SRK-T-170 Cooling overload protective control (i) Operating conditions: When the outdoor air temperature (TH2) has become continuously for 30 seconds at 41ºC or more, or 47ºC or more with the compressor running, the lower limit speed of compressor is brought up.
  • Page 40 '14 • SRK-T-170 Upper limit 50 rps Lower limit 50 rps Upper limit 50 rps Lower limit 44 rps Upper limit 60 rps Lower limit 30 rps Outdoor air temperature.(°C ) Outdoor air temperature (˚C) First time After the second times (iii) Reset conditions: Heating high pressure control (i) Purpose:...
  • Page 41 '14 • SRK-T-170 (g) Heating overload protective control Indoor unit side Operating conditions : Detail of operation : Reset conditions : (ii) Outdoor unit side Operating conditions : When the outdoor air temperature (TH2) is 22ºC or higher continues for 30 seconds while the compressor command speed other than 0 rps.
  • Page 42 '14 • SRK-T-170 Compressor overheat protection (i) Purpose: It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the com- pressor overheat. (ii) Detail of operation 1) Speeds are controlled with temperature detected by the sensor mounted on the discharge pipe. (Example) Fuzzy 4 rps After lapse of 60 seconds.
  • Page 43 '14 • SRK-T-170 Serial signal transmission error protection Purpose: (ii) Detail of operation: Rotor lock Outdoor fan motor protection Outdoor fan control at low outdoor temperature Cooling Operating conditions: Detail of operation: Outdoor fan Outdoor temperature > 10˚C Outdoor temperature < = 10˚C Reset conditions: (ii) Heating...
  • Page 44 '14 • SRK-T-170 (r) Refrigeration cycle system protection (i) 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 1) and 2) above, the compressor speed, indoor air temperature (Th1) and indoor heat exchanger temperature (Th2) have met the conditions in the following table for 10 minutes: Indoor air temperature (Th1)/ Operation mode...

  • Page 45: Maintenance Data

    '14 • SRK-T-170 10. 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 outdoor unit, there may be an electrical charge applied to the main circuit (electrolytic condenser), so begin work only after discharg- ing this electrical charge (to DC 10 V or lower).
  • Page 46 '14 • SRK-T-170 (4) Troubleshooting procedure (If the air-conditioner runs) Con rm the contents of the customer complaint. The cause of the trouble can be speci cally identi ed. Check the self-diagnosis display. Eliminate the cause of the trouble and perform an operation check.
  • Page 47 '14 • SRK-T-170 (5) Self-diagnosis table When this air-conditioner performs an emergency stop, the reason why the emergency stop occurred is displayed by the ashing of display lights. If the air-conditioner is operated using the remote control 3 minutes or more after the emergency stop, the trouble display stops and the air-conditioner resumes operation.
  • Page 48 '14 • SRK-T-170 (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 con rmed, it is possible to get a grasp of the conditions at the time trouble occurred by checking these service data.
  • Page 49 '14 • SRK-T-170 *3: To count the number of ashes in the service mode, count the number of ashes 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 ashes.) 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 50 '14 • SRK-T-170 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 51 '14 • SRK-T-170 (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 light Error coad (10's digit) (1's digit) Normal Can not receive signals for 35 Power source is faulty.
  • Page 52 '14 • SRK-T-170 Note (1) The number of ashes when in the Service Mode do not include the 1.5 second period when the lights light up at rst (start signal). (See the example 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 53 '14 • SRK-T-170 (e) Room temperature sensor temperature, indoor heat exchanger sensor temperature, outdoor air tempera- ture sensor temperature, outdoor heat exchanger sensor temperature table Unit: ºC * If no data are recorded (error code is normal), the display for each sensor becomes as shown below. Sensor value displayed when the error code is normal Sensor name -19ºC...
  • Page 54 '14 • SRK-T-170 Discharge pipe temperature table Unit: ºC * 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 Discharge pipe sensor temperature -64ºC (Example) Discharge pipe temperature: “122ºC”...
  • Page 55 '14 • SRK-T-170 Service data record form Customer Model 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 56 '14 • SRK-T-170 (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 57 '14 • SRK-T-170 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. ＊   ＊ Overload operation, compressor Current safe stop lock, overcharge...
  • Page 58 '14 • SRK-T-170 Gas shortage, defective discharge Over heat of compressor pipe sensor Wiring error including power cable, defective indoor/ Error of signal transmission outdoor PCB ② ③ ② ③ ① ②...
  • Page 59 '14 • SRK-T-170 Insufficient refregerant amount, Faulty power transistor, Broken compressor wire Trouble of outdoor unit Service valve close, Defective EEV, Defective outdoor PCB source source source source ◆  (1)        Notes (1) resistance and coil wire resistance of Check coil wire resistance, see page 56.
  • Page 60 '14 • SRK-T-170 Defective compressor, defective Rotor lock outdoor PCB See page 56. (8) Phenomenon observed after shortcircuit, wire breakage on sensor (a) Indoor unit Phenomenon Operation Sensor mode Shortcircuit Disconnected wire Cooling Room temperature sensor Heating Cooling Heat exchanger sensor Heating Cooling...
  • Page 61 '14 • SRK-T-170 (9) Checking the indoor electrical equipment (a) Indoor PCB check procedure Is there voltage between terminal Inspect power source blocks ① and ② ? (AC 220/230/240 for outdoor unit. Is the fuse burnt out? (3.15 A) Replace fuse. Is the voltage between terminal Replace indoor PCB.
  • Page 62 '14 • SRK-T-170 (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 63 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 Mark Color Black Orange Inspection power transistor Remove the fasten terminal and test output voltage White Yellow...
  • Page 64 '14 • SRK-T-170 (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 65 INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS Air-Conditioning & Refrigeration Division 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.

This manual is also suitable for:

Srk25zxa-sbSrk25zxa-ssSrk25zxa-srSrc25zxa-s

Table of Contents