Mitsubishi Electric PUHY-P288 - Manuals

iv HWE08040 GB Before installing the unit WARNING Do not install the unit where a gas leak may occur. If gaseous refrigerant leaks and piles up around the unit, it may be ignited. Do not use the unit to keep food items, animals, plants, artifacts, or for other special purposes. The unit is not desig...

v v HWE08040 GB Before installing the unit (moving and reinstalling the unit) and performing electrical work CAUTION Properly ground the unit. Do not connect the grounding wire to a gas pipe, water pipe, lightning rod, or grounding wire from a telephone pole. Im-proper grounding may result in electr...

vi HWE08040 GB Before the test run CAUTION Turn on the unit at least 12 hours before the test run. Keep the unit turned on throughout the season. If the unit is turned off in the middle of a season, it may result in malfunc-tions. To avoid the risk of electric shock or malfunction of the unit, do no...

CONTENTS HWE08040 GB I Read Before Servicing [1] Read Before Servicing .............................................................................................................. 3[2] Necessary Tools and Materials ......................................................................................

- 1 - HWE08040 GB I Read Before Servicing [1] Read Before Servicing ....................................................................................................... 3 [2] Necessary Tools and Materials.......................................................................................... 4 ...

[ I Read Before Servicing ] - 3 - HWE08040 GB I Read Before Servicing [1] Read Before Servicing 1. Check the type of refrigerant used in the system to be serviced. Refrigerant Type Multi air conditioner for building application CITY MULTI THMU-A, YHMU-A series R410A 2. Check the symptoms exhibited b...

[ I Read Before Servicing ] - 4 - HWE08040 GB [2] Necessary Tools and Materials Prepare the following tools and materials necessary for installing and servicing the unit. Tools for use with R410A (Adaptability of tools that are for use with R22 or R407C) 1. To be used exclusively with R410A (not to ...

[ I Read Before Servicing ] - 5 - HWE08040 GB [3] Piping Materials 1. Copper pipe materials ΠThe distinction between O-materials (Annealed) and 1/2H-materials (Drawn) is made based on the strength of the pipes them- selves. ΠO-materials (Annealed) can easily be bent with hands. Π1/2H-materials (D...

[ I Read Before Servicing ] - 6 - HWE08040 GB 4. Thickness and refrigerant type indicated on the piping materials Ask the pipe manufacturer for the symbols indicated on the piping material for new refrigerant. 5. Flare processing (O-material (Annealed) and OL-material only) The flare processing dime...

[ I Read Before Servicing ] - 7 - HWE08040 GB [4] Storage of Piping 1. Storage location Store the pipes to be used indoors. (Warehouse at site or owner's warehouse) If they are left outdoors, dust, dirt, or moisture may infiltrate and contaminate the pipe. 2. Sealing the pipe ends Both ends of the p...

[ I Read Before Servicing ] - 8 - HWE08040 GB [6] Brazing No changes have been made in the brazing procedures. Perform brazing with special care to keep foreign objects (such as oxide scale, water, and dust) out of the refrigerant system. Example: Inside the brazed connection 1. Items to be strictly...

[ I Read Before Servicing ] - 9 - HWE08040 GB [7] Air Tightness Test No changes have been made in the detection method. Note that a refrigerant leak detector for R22 will not detect an R410A leak. 1. Items to be strictly observed ΠPressurize the equipment with nitrogen up to the design pressure (4....

[ I Read Before Servicing ] - 10 - HWE08040 GB [8] Vacuum Drying (Evacuation) 1. Vacuum pump with a reverse-flow check valve (Photo1) To prevent the vacuum pump oil from flowing into the refrigerant circuit during power OFF or power failure, use a vacuum pump with a reverse-flow check valve.A revers...

[ I Read Before Servicing ] - 11 - HWE08040 GB [9] Refrigerant Charging 1. Reasons R410A is a pseudo-azeotropic HFC blend (boiling point R32=-52°C[-62°F], R125=-49°C[-52°F]) and can almost be handled the same way as a single refrigerant, such as R22. To be safe, however, draw out the refrigerant fro...

[ I Read Before Servicing ] - 12 - HWE08040 GB [11] Characteristics of the Conventional and the New Refrigerants 1. Chemical property As with R22, the new refrigerant (R410A) is low in toxicity and chemically stable nonflammable refrigerant.However, because the specific gravity of vapor refrigerant ...

- 15 - HWE08040 GB II Restrictions [1] System configuration ....................................................................................................... 17 [2] Types and Maximum allowable Length of Cables ........................................................... 18 [3] Switch Settings a...

[ II Restrictions ] - 17 - HWE08040 GB II Restrictions [1] System configuration 1. Table of compatible indoor units The table below summarizes the types of indoor units that are compatible with different types of outdoor units. 1) "Maximum total capacity of connectable indoor units" refers t...

[ II Restrictions ] - 18 - HWE08040 GB [2] Types and Maximum allowable Length of Cables 1. Wiring work (1) Notes 1) Have all electrical work performed by an authorized electrician according to the local regulations and instructions in this man- ual. 2) Install external transmission cables at least 5...

[ II Restrictions ] - 19 - HWE08040 GB 2) Remote controller wiring *1 MA remote controller refers to MA remote controller (PAR-20MAA, PAR-21MAA), MA simple remote controller, and wireless remote controller. *2 M-NET remote controller refers to ME remote controller and ME simple remote controller.*3 ...

[ II Restrictions ] - 21 - HWE08040 GB (2) Power supply switch connector connection on the outdoor unit (Factory setting: The male power supply switch connector is connected to CN41.) *1 The need for a power supply unit for transmission lines depends on the system configuration.*2 The replacement of...

[ II Restrictions ] - 22 - HWE08040 GB (6) Miscellaneous settings Cooling-only setting for the indoor unit: Cooling only model (Factory setting: SW3-1 "OFF.")When using indoor unit as a cooling-only unit, set SW3-1 to ON. (7) Various types of control using input-output signal connector on th...

[ II Restrictions ] - 23 - HWE08040 GB Example of wiring connection (1) CN51 (2) CN3S CN51 X Y L 1 L 2 ecr uo sr e wo p p ma L Distant control board Relay circuit Adapter 1 Outdoor unitcontrol board Preparations in the field Maximum cable length is 10m 54 3 X Y L1 : Outdoor unit error display lampL2...

[ II Restrictions ] - 24 - HWE08040 GB 1) SW4-4: OFF (Compressor ON/OFF, Low-noise mode) *1. When SW4-4 on the outdoor unit in one refrigerant circuit system is set to ON , this function cannot be used.*2. This function and the 4 levels or 8 levels on-DEMAND function can be used together. Input the ...

- 28 - [ II Restrictions ] GB HWE08040 (4) Wiring method 1) Indoor/outdoor transmission line Daisy-chain terminals M1 and M2 on the terminal block for indoor-outdoor transmission line (TB3) on the outdoor units (OC, OS1, OS2) (Note 1), and terminals M1 and M2 on the terminal block for indoor-outdoor...

[ II Restrictions ] 29 - 29 - HWE08040 GB 2. An example of a system with one outdoor unit to which 2 or more LOSSNAY units are connected (manual address setup for both indoor and outdoor units) (1) Sample control wiring (2) Cautions 1) M-NET remote controller and MA remote controller can- not both b...

[ II Restrictions ] 33 - 33 - HWE08040 GB 4. A system in which a system controller is connected to the transmission line for centralized control and which is pow- ered from an outdoor unit (1) Sample control wiring (2) Cautions 1) M-NET remote controller and MA remote controller can- not both be con...

- 40 - [ II Restrictions ] GB HWE08040 (4) Wiring method 1) Indoor/outdoor transmission line Same as [5] 3. Shielded cable connection Same as [5] 1. 2) Transmission line for centralized control Same as [5] 4. Shielded cable connection Same as [5] 4. 3) MA remote controller wiring Same as [5] 1. When...

[ II Restrictions ] - 41 - HWE08040 GB [8] Restrictions on Pipe Length (1) End branching P72 - P120 models Unit: m [ft] Operation Pipe sections Allowable length of pipes Length Total pipe length A+B+C+D +a+b+c+d+e+f 1000 [3280] or less Total pipe length (L) from the outdoor unit to the farthest indo...

[ II Restrictions ] - 43 - HWE08040 GB 1. Refrigerant pipe size (1) Diameter of the refrigerant pipe between the outdoor unit and the first branch (outdoor unit pipe size) (2) Size of the refrigerant pipe between the first branch and the indoor unit (indoor unit pipe size) (3) Size of the refrigeran...

- 45 - HWE08040 GB III Outdoor Unit Components [1] Outdoor Unit Components and Refrigerant Circuit .......................................................... 47 [2] Control Box of the Outdoor Unit ....................................................................................... 49 [3] Outdoor ...

[ III Outdoor Unit Components ] - 47 - HWE08040 GB III Outdoor Unit Components [1] Outdoor Unit Components and Refrigerant Circuit 1. PUHY-P72, P96, P120THMU-A PUHY-P72, P96, P120YHMU-A (1) Front view of a outdoor unit Fan Control Box Fan guard Fin guard Front panel Heat exchanger

[ III Outdoor Unit Components ] - 48 - HWE08040 GB 2. PUHY-P72, P96THMU-A PUHY-P72, P96YHMU-A (1) Refrigerant circuit 3. PUHY- P120THMU-A PUHY- P120YHMU-A (1) Refrigerant circuit High pressure sensor(63HS1) High-pressure switch(63H1) Accumulator Transformer Box(YHMU-A only) Compressor cover Compress...

[ III Outdoor Unit Components ] - 52 - HWE08040 GB [3] Outdoor Unit Circuit Board 1. Outdoor unit control board CN332 Output 18VDC GND (Fan board) LED2Lit during normal CPU operation Serial communication signal inputGND INV boardOutput 17VDC CN801Pressure switch connection CN4 GND Serial communicati...

[ III Outdoor Unit Components ] - 53 - HWE08040 GB 2. M-NET board Power supply output for centralized control system (30VDC) Indoor/outdoor transmission line input/output (30VDC) CN102 CNS2Transmission line input/output for centralized control system (30VDC) CNIT Input 12VDC GND Input 5VDC Power sup...

[ III Outdoor Unit Components ] - 59 - HWE08040 GB 5. Noise Filter (1) PUHY-P72, P96THMU-A Grounding TB21Input/output （ L1 ） CN02Output   L1   L2 TB22Input/output （ L2 ） TB23Input/output （ L3 ） CN01Input   L3   L2   L1 F1Fuse250VAC 6.3A F2Fuse250VAC 6.3A

- 63 - HWE08040 GB IV Remote Controller [1] Functions and Specifications of MA and ME Remote Controllers ................................... 65 [2] Group Settings and Interlock Settings via the ME Remote Controller ............................. 66 [3] Interlock Settings via the MA Remote Controller ...

[ IV Remote Controller ] - 65 - HWE08040 GB IV Remote Controller [1] Functions and Specifications of MA and ME Remote Controllers There are two types of remote controllers: M-NET (ME) remote controller, which is connected on the indoor-outdoor transmission line, and MA remote controller, which is co...

[ IV Remote Controller ] - 66 - HWE08040 GB [2] Group Settings and Interlock Settings via the ME Remote Controller 1. Group settings/interlock settings <Deletion error> [Normal display] (B) Interlock Settings (A) Group Settings Indoor unit address display window Indoor unit addressdisplay wind...

[ IV Remote Controller ] - 67 - HWE08040 GB <Entry found> <No entries found> (C) To return to the normal display When all the group settings and interlock settings are made, take the following step to go back to the normal display. Press and hold buttons [FILTER] and [ ] simultaneously f...

[ IV Remote Controller ] - 68 - HWE08040 GB 2. Remote controller function selection via the ME remote controller (A) To delete group settings (B) To delete interlock settings <Successful completion of deletion> will be displayed in the room temperature display window. - If a transmission error...

[ IV Remote Controller ] - 69 - HWE08040 GB [Lower limit temperature]: Appears in the preset temperature display window [Upper limit temperature: Appears in the time display window [Settable range for the lower limit temperature] : 19 C 30 C (Settable up to the upper limit temperature that is shown ...

[ IV Remote Controller ] - 70 - HWE08040 GB [3] Interlock Settings via the MA Remote Controller 1. LOSSNAY interlock setting (Make this setting only when necessary.) [Operation Procedures] <Indoor unit address and indoor unit> <LOSSNAY address and LOSSNAY> - Without interlocked LOSSNAY s...

[ IV Remote Controller ] - 71 - HWE08040 GB [4] Using the built-in Temperature Sensor on the Remote Controller 1. Selecting the position of temperature detection (Factory setting: SW1-1 on the controller board on the indoor unit is set to OFF.) To use the built-in sensor on the remote controller, se...

- 73 - HWE08040 GB V Electrical Wiring Diagram [1] Electrical Wiring Diagram of the Outdoor Unit ................................................................. 75 [2] Electrical Wiring Diagram of Transmission Booster ......................................................... 78

[ V Electrical Wiring Diagram ] - 75 - HWE08040 GB V Electrical Wiring Diagram [1] Electrical Wiring Diagram of the Outdoor Unit 1. Electrical wiring diagram of the outdoor unit(1) PUHY-P72, P96THMU-A HIC bypass,Controls refrigerant flow in HIC circuit G Ground G Explanation Symbol <Symbol explan...

[ V Electrical Wiring Diagram ] - 78 - HWE08040 GB [2] Electrical Wiring Diagram of Transmission Booster 100V/200VAC Terminal block for power supply (TB1) L Red Red Red White Green 250V 5A Grounding RedRed Red U U White White White White White White Blue Red Red DSA White White Blue Red Red Red Red ...

- 79 - HWE08040 GB VI Refrigerant Circuit [1] Refrigerant Circuit Diagram ............................................................................................. 81 [2] Principal Parts and Functions .......................................................................................... 82

[ VI Refrigerant Circuit ] - 81 - HWE08040 GB VI Refrigerant Circuit [1] Refrigerant Circuit Diagram 1. Outdoor unit (1) PUHY-P72, P96 models (2) PUHY-P120 models HEX O/S Comp ACC CP2 SV9 BV1 BV2 ST2 ST1 LEV2a LEV2b CV SV5b 63LS CJ1 CP1 TH5 21S4b TH6 TH7 TH3 TH2 TH4 CJ2 ST7 63HS1 ST6 ST3 21S4a 63H1 ...

- 87 - HWE08040 GB VII Control [1] Functions and Factory Settings of the Dipswitches ......................................................... 89 [2] Controlling the Outdoor Unit ............................................................................................ 96 [3] Operation Flow Chart ...

[ VII Control ] - 89 - HWE08040 GB VII Control [1] Functions and Factory Settings of the Dipswitches 1. Outdoor unit (1) Control board 1) Unless otherwise specified, leave the switch to OFF where indicated by "-," which may be set to OFF for a reason.2) A: Only the switch on either the OC or...

[ VII Control ] - 93 - HWE08040 GB 2. Function of the switch (Indoor unit)(1) Dipswitches 1) SW1,3 (2) Address switch Actual indoor unit address setting varies in different systems. Refer to the installation manual for the outdoor unit for detailson how to make the address setting.Each address is se...

[ VII Control ] - 94 - HWE08040 GB 3. Function of the switch <Remote controller>(1) MA remote controller (PAR-20MAA) The SW is located at the bottom of the remote controller under the cover. Operate the switches to perform the remote con-troller main/sub setting or other function settings. Nor...

[ VII Control ] - 95 - HWE08040 GB (2) ME remote controller (PAR-F27MEA) Set the address of the remote controller with the rotary switch. To set addresses, use a precision slotted screw driver [2.0 mm [0.08 in] (w)], and do not apply than 19.6N. The use of any other tool or applying too much load ma...

[ VII Control ] - 98 - HWE08040 GB -6- Compressor Frequency Control Œ Depending on the capacity required, the frequency of the compressor is controlled to keep constant evaporation temperature (0°C [32°F] = 0.71 MPa [103 psi]) during cooling operation, and condensing temperature (49°C [120°F] = 2.88...

[ VII Control ] - 100 - HWE08040 GB -8- Refrigerant Recovery Control Recovery of refrigerant is performed during heating operation to prevent the refrigerant from accumulating inside the unit whileit is stopped (unit in fan mode), or inside the indoor unit that is in cooling mode or in heating mode ...

[ VII Control ] - 101 - HWE08040 GB (2) During cooling operation Starting refrigerant recovery mode The refrigerant recovery mode starts when all the following conditions are met: Π30 minutes have passed since the completion of previous refrigerant recovery. ΠWhen the unit keeps running for 3 minu...

[ VII Control ] - 104 - HWE08040 GB -13- Emergency Operation Mode 1. Problems with the outdoor unit ΠEmergency operation mode is a temporary operation mode in which the outdoor unit that is not in trouble operates when one of the outdoor units in the P144 through P240 models is in trouble or when o...

[ VII Control ] - 105 - HWE08040 GB (2) Ending the emergency operation 1) End conditions When one of the following conditions is met, emergency operation stops, and the unit makes an error stop. ΠWhen the integrated operation time of compressor in cooling mode has reached four hours. ΠWhen the int...

[ VII Control ] - 110 - HWE08040 GB 2. Operations in each mode(1) Cooling operation *Note 1. The indoor fan operates at the set notch under cooling mode regardless of the ON/OFF state of the thermostat. Cooling operation Test run mode ON Thermostat ON 3-minute restart prevention *Note 1 YES YES YES ...

[ VII Control ] - 111 - HWE08040 GB (2) Heating operation 1) When outdoor unit starts defrosting, it transmits defrost operations command to indoor unit, and the indoor unit start defrosting operations. Similarly when defrosting operation stops, indoor unit returns to heating operation after receivi...

- 113 - HWE08040 GB VIII Test Run Mode [1] Items to be checked before a Test Run ......................................................................... 115 [2] Test Run Method ........................................................................................................... 116 [3] Opera...

[ VIII Test Run Mode ] - 115 - HWE08040 GB VIII Test Run Mode [1] Items to be checked before a Test Run (1) Check for refrigerant leak and loose cables and connectors. (2) Measure the insulation resistance between the power supply terminal block and the ground with a 500V megger and make sure it rea...

[ VIII Test Run Mode ] - 116 - HWE08040 GB [2] Test Run Method The figure shows an MA remote controller (PAR-21MAA). PAR-21MAA ON/OFF FILTER CHECK OPERATION CLEAR TEST TEMP. MENU BACK DAY MONITOR/SET CLOCK ON/OFF Set Temperature buttons Down Up Operation Mode button ON/OFF button Fan Speed button Te...

[ VIII Test Run Mode ] - 117 - HWE08040 GB [3] Operating Characteristic and Refrigerant Amount It is important to have a clear understanding of the characteristics of refrigerant and the operating characteristics of air conditioners before attempting to adjust the refrigerant amount in a given syste...

[ VIII Test Run Mode ] - 118 - HWE08040 GB 3. Amount of refrigerant to be added The amount of refrigerant that is shown in the table below is factory-charged to the outdoor units. The amount necessary for extended pipe (field piping) is not included and must be added on site. (1) Calculation formula...

[ VIII Test Run Mode ] - 119 - HWE08040 GB (2) Example: PUHY-P144Y(T)SHMU-A (3) Sample calculation CAUTION Charge liquid refrigerant (as opposed to gaseous refrigerant) into the system. ΠIf gaseous refrigerant is charged into the system, the composition of the refrigerant in the cylinder will chang...

[ VIII Test Run Mode ] - 120 - HWE08040 GB [5] Refrigerant Amount Adjust Mode 1. Procedures Follow the procedures below to add or extract refrigerant as necessary depending on the operation mode. When the function switch (SW4-3) on the main board on the outdoor unit (OC only) is turned to ON, the un...

[ VIII Test Run Mode ] - 121 - HWE08040 GB CAUTION Do not release the extracted refrigerant into the air. CAUTION Charge liquid refrigerant (as opposed to gaseous refrigerant) into the system. ΠIf gaseous refrigerant is charged into the system, the composition of the refrigerant in the cylinder wil...

[ VIII Test Run Mode ] - 127 - HWE08040 GB 2. 2-unit combination (1) Cooling operation Operation Outdoor unit model PUHY-P144TSHMU-A PUHY-P72THMU-A PUHY-P72THMU-A Operating conditions Ambient tempera-ture Indoor DB/WB 26.7 °C /19.4 °C [80 °F/67 °F] Outdoor 35 °C / - [95 °F/ - ] Indoor unit No. of co...

- 147 - HWE08040 GB IX Troubleshooting [1] Error Code Lists ............................................................................................................. 149 [2] Responding to Error Display on the Remote Controller ................................................. 152 [3] Investigati...

[ IX Troubleshooting ] - 152 - HWE08040 GB [2] Responding to Error Display on the Remote Controller 1. Error Code Serial communication error 2. Error definition and error detection method Serial communication error between the control board and the INV board on the compressor, and between the contro...

[ IX Troubleshooting ] - 166 - HWE08040 GB 1. Error Code <Transmission power supply fault error detail FF (Outdoor unit)> 2. Error definition and error detection method Transmission power output failure 3. Cause 1) Wiring failure2) Transmission power supply cannot output voltage because overcu...

[ IX Troubleshooting ] - 172 - HWE08040 GB 1. Error Code VDC error (Detail code 110) 2. Error definition and error detection method Bus voltage abnormality If Vdc 400V or Vdc 160V is detected. (H/W detection) 3. Cause, check method and remedy Same as detail code No.108 and 109 of 4220 error Refer to...

[ IX Troubleshooting ] - 181 - HWE08040 GB 1. Error Code ACCT overcurrent (H/W detection) (Detail code 102)DCCT overcurrent (H/W detection) (Detail code 103)Instantaneous overcurrent (Detail code 106)Overcurrent (Detail code 107) 2. Error definition and error detection method P76 and P96 models Over...

[ IX Troubleshooting ] - 185 - HWE08040 GB 1. Error Code HIC bypass circuit outlet temperature sensor (TH2) fault (Outdoor unit) Heat exchanger outlet temperature sensor (TH3) fault (Outdoor unit) Discharge temperature sensor (TH4) fault (Outdoor unit) Accumulator inlet temperature sensor (TH5) faul...

[ IX Troubleshooting ] - 195 - HWE08040 GB 1. Error Code Transmission processor hardware error 2. Error definition and error detection method Although "0" was surely transmitted by the transmission processor, "1" is displayed on the transmission line. The address/attribute appeared o...

[ IX Troubleshooting ] - 205 - HWE08040 GB 1. Error Code No response error 2. Error definition and error detection method ΠWhen no response command is returned although acknowledgement (ACK) is received after transmission, an error is detect- ed. ΠWhen the data is transmitted 10 times in a row wit...

[ IX Troubleshooting ] - 210 - HWE08040 GB 1. Error Code Total capacity error 2. Error definition and error detection method The model total of indoor units in the system with one outdoor unit exceeds limitations. 3. Error source, cause, check method and remedy, 7100 Error source Cause Check method ...

[ IX Troubleshooting ] - 212 - HWE08040 GB 1. Error Code Wrong number of connected units 2. Error definition and error detection method The number of connected indoor units is "0" or exceeds the allowable value. 3. Error source, cause, check method and remedy 7102 Error source Cause Check me...

[ IX Troubleshooting ] - 213 - HWE08040 GB 1. Error Code Address setting error 2. Error definition and error detection method Erroneous setting of OC unit address 3. Cause, check method and remedy 1. Error Code Attribute setting error 2. Error definition and error detection method 7105 Error source ...

[ IX Troubleshooting ] - 218 - HWE08040 GB -1- Troubleshooting according to the remote controller malfunction or the external input error In the case of MA remote controller 1. Phenomena Even if the operation button on the remote controller is pressed, the display remains unlit and the unit does not...

[ IX Troubleshooting ] - 219 - HWE08040 GB In the case of MA remote controller 2. Phenomena When the remote controller operation SW is turned on, the operation status briefly appears on the display, then it goes off, and the display lights out immediately, and the unit stops. (1) Cause 1) The power ...

[ IX Troubleshooting ] - 222 - HWE08040 GB In case of M-NET remote controller 1. Phenomena Even if the operation button on the remote controller is pressed, the display remains unlit and the unit does not start running.(Power indicator does not appear on the screen.) (1) Cause 1) The power for the M...

[ IX Troubleshooting ] - 226 - HWE08040 GB Both for MA remote controller and M-NET remote controller 1. Phenomena Although cooling operation starts with the normal remote controller display, the capacity is not enough (1) Cause, check method and remedy Cause Check method and remedy 1. Compressor fre...

[ IX Troubleshooting ] - 228 - HWE08040 GB 2. Phenomena Although heating operation starts with the normal remote controller display, the capacity is not enough. (1) Cause, check method and remedy Cause Check method and remedy 1. Compressor frequency does not rise sufficiently. ΠFaulty detection of ...

[ IX Troubleshooting ] - 230 - HWE08040 GB 3. Phenomena Outdoor unit stops at times during operation. (1) Cause, check method and remedy Cause Check method and remedy The first stop is not considered as an error, as the unit turns to anti-restart mode for 3 minutes as a pre-liminary error. (1) Check...

[ IX Troubleshooting ] - 231 - HWE08040 GB [3] Investigation of Transmission Wave Shape/Noise 1. M-NET transmission Control is performed by exchanging signals between the outdoor unit and the indoor unit (M-NET remote controller) through M-NET transmission. Noise interference on the transmission lin...

[ IX Troubleshooting ] - 233 - HWE08040 GB 2. MA remote controller transmission The communication between the MA remote controller and the indoor unit is performed with current tone burst. (1) Symptoms caused by noise interference on the transmission line If noise is generated on the transmission li...

[ IX Troubleshooting ] - 238 - HWE08040 GB -5- LEV LEV operation LEV (Indoor unit: Linear expansion valve), LEV2a, and LEV2b (Outdoor unit: Linear expansion valve) are stepping-motor-driv-en valves that operate by receiving the pulse signals from the indoor and outdoor unit control boards. (1) Indoo...

[ IX Troubleshooting ] - 239 - HWE08040 GB (2) Outdoor LEV (LEV1) The valve opening changes according to the number of pulses. 1) Connections between the outdoor control board and LEV1 (outdoor expansion valve) 2) Pulse signal output and valve operation 3) LEV valve closing and opening operation LEV...

[ IX Troubleshooting ] - 240 - HWE08040 GB (3) Judgment methods and possible failure mode The specifications of the outdoor unit (outdoor LEV) and the indoor unit (indoor LEV) differ.Therefore, remedies for each failuremay vary. Check the remedy specified for the appropriate LEV as indicated in the ...

[ IX Troubleshooting ] - 241 - HWE08040 GB (4) Outdoor unit LEV (LEV1) coil removal procedure 1) LEV component As shown in the figure, the outdoor LEV is made in such a way that the coils and the body can be separated. 2) Removing the coils Fasten the body tightly at the bottom (Part A in the figure...

[ IX Troubleshooting ] - 242 - HWE08040 GB (5) Outdoor unit LEV (LEV2a,2b) coil removal procedure Notes on the procedure 1) Do not put undue pressure on the motor.2) Do not use motors if dropped.3) Do not remove the cap until immediately before the procedure.4) Do not wipe off any molybdenum.5) Do n...

[ IX Troubleshooting ] - 243 - HWE08040 GB Replacement procedure 1) Stop the air conditioner. After checking that the air conditioner is stopped, turn off the power of the outdoor unit.2) Prepare two spanners. Hold the valve body with one spanner and loosen the locknut with another one. Turning the ...

[ IX Troubleshooting ] - 244 - HWE08040 GB -6- Inverter (THMU-A) ΠReplace only the compressor if only the compressor is found to be defective. (Overcurrent will flow through the inverter if the compressor is damaged, however, the power supply is automatically cut when overcurrent is detected, prote...

[ IX Troubleshooting ] - 248 - HWE08040 GB (3) Trouble treatment when the main power breaker is tripped. Items to be checked Phenomena Remedy [1] Perform Meg check between the terminals on the power terminal block TB1. Zero to several ohm, or Meg failure Check each part in the main inverter circuit....

[ IX Troubleshooting ] - 251 - HWE08040 GB (6) Diode stack (P120 model) Measure resistances between each pair of terminals on the diode stack with a tester, and use the results for troubleshoot-ing.Refer to (5) " Intelligent power module (IPM) " for notes on measurement and tester selection....

[ IX Troubleshooting ] - 256 - HWE08040 GB (3) Trouble treatment when the main power breaker is tripped (4) Trouble treatment when the main power earth leakage breaker is tripped The insulation resistance could go down to close to 1Mohm after installation or when the power is kept off for an extende...

[ IX Troubleshooting ] - 259 - HWE08040 GB -7- Control Circuit (THMU-A) (1) Control power source function block 1) PUHY-P72, P96THMU-A Outdoor unit Power source system (AC 208 / 230 V) Control system (DC 5 ~ 30 V) * MA remote controllers and M-NET remote controllers cannot be used together. (Both th...

[ IX Troubleshooting ] - 260 - HWE08040 GB 2) PUHY-P120THMU-A * MA remote controllers and M-NET remote controllers cannot be used together. (Both the M-NET and MA remote controller can be connected to a system with a system controller.) TB2 TB15 Terminal block for power source TB5 Terminal block for...

[ IX Troubleshooting ] - 261 - HWE08040 GB (2) Troubleshooting transmission power circuit of outdoor unit 1) PUHY-P72, P96THMU-A Check the voltage between No.1 and No.2 pins of the CNS2 on the control board. Check the wiring between the control board and powersupply board for the transmission line (...

[ IX Troubleshooting ] - 263 - HWE08040 GB -6- Control Circuit (YHMU-A) (1) Control power source function block 1) PUHY-P72, P96, P120YHMU-A Outdoor unit Power source system (AC 380 / 415 V)Control system (DC 5 ~ 30 V) * MA remote controllers and M-NET remote controllers cannot be used together. (Bo...

[ IX Troubleshooting ] - 265 - HWE08040 GB [5] Refrigerant Leak 1. Leak spot: In the case of extension pipe for indoor unit (Cooling season) 1) Mount a pressure gauge on the service check joint (CJ2) on the low-pressure side.2) Stop all the indoor units, and close the liquid service valve (BV2) insi...

[ IX Troubleshooting ] - 266 - HWE08040 GB 3. Leak spot: In the case of extension pipe for indoor unit (Heating season)(1) Run all the indoor units in heating test run mode. 1) To run the indoor unit in test run mode, turn SW3-2 from ON to OFF when SW3-1 on the outdoor control board is ON.2) Change ...

[ IX Troubleshooting ] - 269 - HWE08040 GB [7] Troubleshooting Using the Outdoor Unit LED Error Display If the LED error display appear as follows while all the SW1 switches are set to OFF, check the items under the applicable itemnumbers below. 1. Error code appears on the LED display. Refer to IX ...

- 271 - HWE08040 GB X LED Monitor Display on the Outdoor Unit Board [1] How to Read the LED on the Service Monitor ............................................................... 273

[ X LED Monitor Display on the Outdoor Unit Board ] - 273 - HWE08040 GB X LED Monitor Display on the Outdoor Unit Board [1] How to Read the LED on the Service Monitor 1. How to read the LED By setting the DIP SW 1-1 through 1-10 (Switch number 10 is represented by 0), the operating condition of the ...

[ X LED Monitor Display on the Outdoor Unit Board ] - 274 - HWE08040 GB 3. Time data storage function The outdoor unit has a simple clock function that enables the unit to calculate the current time with an internal timer by receiv-ing the time set by the system controller, such as G(B)-50A.If an er...

[ X LED monitor display on the outdoor unit board ] - 275 - HWE08040 X L E D mo ni to r di sp la y on t h e ou tdoo r un it bo ar d L E D mo ni tor di s p la y C u rrent dat a No . SW1 Ite m Disp la y Unit (A , B) *1 Re m a rk s 12 34 567 89 0 L D1 LD 2 L D3 LD4 L D5 L D6 L D7 LD 8 O C OS 0 00 00 00...

[ X LED monitor display on the outdoor unit board ] - 276 - HWE08040 11 11 01 000 00 0 Ex ter nal si gn al (O pe n i npu t c on ta ct po int ) Contact po in t d e - mand Lo w- noi s e mode (C apa ci ty p ri o rity ) S n ow se ns o r Coo lin g- he at ing ch an geo ve r (C oo ling ) C o ol in g- h eat...

[ X LED monitor display on the outdoor unit board ] - 285 - HWE08040 Error history No . SW1 Ite m Disp la y Unit (A , B) *1 Re m a rk s 12 34 567 89 0 L D1 LD 2 L D3 LD4 L D5 L D6 L D7 LD 8 O C OS 20 1 10 01 001 10 0 Ou td oo r un it op er at ion s tat us 3- min ute s re st ar t mo de Co mpr es so r...

[ X LED monitor display on the outdoor unit board ] - 299 - HWE08040 Setting data No . SW1 Ite m Disp la y Unit (A , B ) *1 Re m a rk s 12 34 567 89 0 L D1 LD 2 L D3 LD4 L D5 L D6 L D7 LD 8 O C OS 51 2 00 00 000 00 1 S e lf- ad dr es s A lt er nat e d is pl ay of s el f a dd re s s a nd u ni t mo de...

[ X LED monitor display on the outdoor unit board ] - 315 - HWE08040 Oth er typ es of dat a No . SW1 It em Display Unit (A , B) *1 Rema rk s 12 345 67 89 0 L D1 L D 2 L D3 LD 4 L D5 LD6 L D7 L D8 OC OS 86 4 00 000 11 01 1 86 5 10 000 11 01 1 86 6 01 000 11 01 1 86 7 11 000 11 01 1 86 8 00 100 11 01 ...