Mitsubishi Electronics P500YMF-C manual

AIR CONDITIONERS CITY MUL TI Models PURY-P400, P500YMF-C Service Handbook Service Handbook PUR Y -P400, P500YMF-C HEAD OFFICE MITSUBISHI DENKI BLDG. MARUNOUCHI TOKYO 100-0005 TELEX J24532 CABLE MELCO TOKYO New publication effective Aug 2002 Specifications subject to change without notice. Service Handbook PURY-P400, P500YMF-C Issued in Aug 2002 F11[...]

Contents 1 PRECAUTIONS FOR DEVICES THA T USE R407C REFRIGERANT ..... 3 [1] Storage of Piping Material ................................................................. 4 [2] Piping Machining ............................................................................... 5 [3] Brazing .................................................................[...]

Contents 1 PRECAUTIONS FOR DEVICES THA T USE R407C REFRIGERANT ..... 3 [1] Storage of Piping Material ................................................................. 4 [2] Piping Machining ............................................................................... 5 [3] Brazing .................................................................[...]

–2– Safety precautions Before installation and electric work Before installing the unit, make sure you read all the “Safety precautions”. The “Safety precautions” provide very important points regarding safety . Make sure you follow them. This equipment may not be applicable to EN61000-3-2: 1995 and EN61000-3-3: 1995. This equipment may[...]

–3– 1 1 1 1 1 PRECAUTIONS FOR DEVICES THA T USE R407C REFRIGERANT Caution Do not use the existing refrigerant piping. • The old refrigerant and refrigerator oil in the existing piping contains a large amount of chlorine which may cause the refrigerator oil of the new unit to deterio- rate. Use refrigerant piping made of phosphorus deoxi- dize[...]

– 4 – [1] Storage of Piping Material (1) Storage location Store the pipes to be used indoors. (W arehouse at site or owner ’ s warehouse) Storing them outdoors may cause dirt, waste, or water to infiltrate. (2) Pipe sealing before storage Both ends of the pipes should be sealed until immediately before brazing. Wrap elbows and T ’ s in plas[...]

– 5 – Use only the necessary minimum quantity of oil ! Reason : 1. The refrigerator oil used for the equipment is highly hygroscopic and may introduce water inside. Notes : • Introducing a great quantity of mineral oil into the refrigerant circuit may also cause a compressor failure. • Do not use oils other than ester oil, ether oil or alky[...]

– 6 – [3] Brazing No changes from the conventional method, but special care is required so that foreign matter (ie. oxide scale, water , dirt, etc.) does not enter the refrigerant circuit. Example : Inner state of brazed section When non-oxide brazing was not used When non-oxide brazing was used Items to be strictly observed : 1. Do not conduct[...]

– 7 – [4] Airtightness T est No changes from the conventional method. Note that a refrigerant leakage detector for R22 cannot detect R407C leakage. Halide torch R22 leakage detector Items to be strictly observed : 1. Pressurize the equipment with nitrogen up to the design pressure and then judge the equipment ’ s airtightness, taking temperat[...]

– 8 – Cylin- der Cylin- der V alve V alve Liquid Liquid [6] Charging of Refrigerant R407C must be in a liquid state when charging, because it is a non-azeotropic refrigerant. For a cylinder with a syphon attached For a cylinder without a syphon attached Cylinder color identification R407C-Gray Charged with liquid refrigerant R410A-Pink Reasons [...]

– 9 – • PURY -P400 · 500YMF-C 2 2 2 2 2 COMPONENT OF EQUIPMENT [1] Appearance of Components Outdoor unit Propeller fan Heat exchanger(front) Compressor Propeller fan Fan motor Fan motor Heat exchanger(rear) SV block 1 SV block 2 4 – way valve 4 – way valve CS circuit Drier CV block 1 CV block 2 Control box Compressor Compressor P500 TYPE[...]

– 10 – Controller Box RELA Y board F ANCON board (for MF3) INV board MAIN board Choke coil (L2) Inteligent P ower Module (IPM) G/A board Y -C board SNB board Diode stack (DS) Magnetic contactor (52C2) Magnetic contactor (52C1) Magnetic contactor (52F) Overload rela y (51C2) F ANCON board (for MF2) Capacitor (C2, C3) (Smoothing capacitor) Noise [...]

– 11 – MAIN board • PUHY / PUR Y CN51 Indication distance 3 - 4 Compressor ON/OFF 3 - 5 Trouble CNRS3 Serial transmission to INV board CN3D SW1 CNTR CNFC1 CNVCC4 Power source for control(5V) CN20 Power supply 3 L1 1 N SW3 SW4 SW2 SWU2 SWU1 CNS1 CNS2 CN40 CNVCC3 Power Source for control 1 - 2 30V 1 - 3 30V 4 - 6 12V 5 - 6 5V CN3S CN3N LD1 Serv[...]

– 12 – INV board CNDR2 Out put to G/A board CNTH CN15V2 Power supply for IPM control CNACCT CNAC2 Power source 1 L2 3 N 5 G CN52C Control for 52C CNF AN Control for MF1 CNR CNRS2 Serial transmission to MAIN board SW1 CNVDC 1 - 4 DC-560V CNVCC4 Power supply (5V) CNL2 Choke coil CNVCC2 Power supply 1 - 2 30V , 1 - 3 30V 4 - 6 12V , 5 - 6 5V[...]

– 13 – CNF AN CNPOW CNFC2 CN15V1 CNDR1 CNIPM1 CNE CNDC1 F ANCON board G/A board[...]

– 14 – Y -C board SNB board[...]

– 15 – BC controller CNTR CN02 M-NET transmission CN03 CN12 Power supply 1 EARTH 3 N 5 L SW4 SW2 SW1 SW5[...]

– 16 – RELA Y 10 board RELA Y 4 board[...]

– 17 – [2] Refrigerant Circuit Diagram and Thermal Sensor PUR Y -P400, 500YMF-C : Solenoid valve : Orifice : Capillary : Check valve : Thermal sensor : Strainer SP : Service port ACC : Accumulator CV3b BV1 BV2 ST1 TH5 CV2b ST15 TH7 TH6 CJ2 MA SA CJ3 CJ1 63HS 63H1 O/S 63H2 SLEV Comp2 Comp1 CV1b CV1a SV32 SV22 CP3a TH12 TH2 TH9 Drier CP2 TH11 ST9[...]

– 18 – CMB-P108, 1010, 1013, 1016V -F A SVM2 TH16 TH11 TH12 SVM1 PS3 PS1 Check v alve b lock Solenoid v alve b lock LEV3 LEV1 TH15 Gas/liquid separator : Solenoid valv e : Orifice : Capillar y : Check v alve : Ther mal sensor : Strainer[...]

– 19 – CMB-P108V -FB Check v alve b lock LEV3a TH25 TH22 Solenoid v alve b lock CP : Solenoid valv e : Orifice : Capillar y : Check v alve : Ther mal sensor : Strainer[...]

– 20 – [3] Electrical Wiring Diagram PUR Y -P400 · 500YMF-C[...]

– 21 – CMB-P108 · 1010V -F A 5 1 2 3 4 4 1 2 3 1 2 3 1 2 3 SVM1 SVM2 13 14 15 9 10 11 12 5 6 7 8 4 4 5 6 87 9 12 11 10 15 14 13 16 16 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 SV7B SV8B SV9B SV10B SV7A SV8A SV9A SV10A SV7C SV8C SV9C SV10C SV1B SV1A SV1C 1 5 6 7 8 9 10 11 12 13 14 15 16 3 2 4 8 9 10 11 12 13 3 2 4 1 5 6 7 [...]

– 22 – CMB-P1013 · 1016V -F A 3 2 1 Power source L TB01 TB01 N ~220V~240V 50/60Hz 1 2 3 SVM2 SVM1 1 3 2 8 8 9 9 10 10 11 11 12 12 13 13 3 2 4 4 1 5 5 6 6 7 7 14 14 15 15 16 16 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 1 2 3 4 1 2 3 4 3 3 4 4 2 2 1 1 SV11B SV11A SV11C SV16C SV16A SV16B SV15C SV15A SV15B SV1[...]

– 23 – CMB-P108V -FB 13 14 15 9 10 11 12 5 6 7 8 4 4 5 6 87 9 12 11 10 15 14 13 16 16 1 2 3 4 2 3 4 1 2 3 4 1 2 3 4 SV7B SV8B SV7A SV8A SV7C SV8C 1 SV1B SV1A SV1C 1 5 6 7 8 9 10 11 12 13 14 15 16 3 2 4 8 9 10 11 12 13 3 2 4 1 5 6 7 14 15 16 4 3 2 1 SV2C SV2A SV2B SV3C SV3A SV3B SV4C SV4A SV4B SV5B SV5A SV5C 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2[...]

–24– 27.0/19 27.0/19 35.0/24.0 35.0/24.0 55 55 55 55 55 27.1 29.2 27.6/26.2/25.2 34.6/32.8/31.7 2000 300 2000 350 200 344 100 100 100 50 50 125 125 125 100 25 10 10 10 10 10 10 10 10 10 10 Hi Hi Hi Hi Hi Hi Hi Hi Hi Hi 360 360 360 340 340 410 410 410 360 280 Discharge (TH11/TH12) Heat exchanger outlet (TH5) Inlet Accumulator Outlet Suction (Com[...]

– 25 – 20.0/- 20.0/- 7.0/6.0 7.0/6.0 55 55 55 55 55 27.1 29.2 25.6/24.3/23.4 32.1/30.5/29.4 60 1400 60 1600 122 Discharge (TH1 1/TH12) Heat exchanger inlet (TH5) Inlet Accumulator Outlet Suction (Comp) (No.1/No.2) Low pressure saturation temperature (TH2) Upper (TH4) Liquid level Lower (TH3) Shell bottom (Comp No.1/No.2) CS circuit (TH9) Circul[...]

– 26 – Function According to Switch Operation Switch Set T iming When Off When On When Off When On SWU 1 ~ 2 SW1 1 ~ 8 Refer to LED monitor display on the outdoor board. 9 ~ 10 SW2 1 2 3 4 5 6 7 8 9 10 SW3 1 2 3 4 5 6 7 8 9 10 SW4 1 2 3 4 5 6 7 8 9 10 - Centralized control not connected. Storing of refrigeration system connection information. S[...]

– 27 – (2) Indoor unit DIP SW1, 3 Model P71 P80 P100 P125 P140 P200 P250 Capacity (model name) code 14 16 20 25 28 40 50 SW2 setting Model P20 P25 P32 P40 P50 P63 Capacity (model name) code 45 68 1 0 1 3 SW2 setting ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF Note 1: The shaded part indicates the s[...]

– 28 – Ceiling height 3 3.5 m 2 2.8 m 1 2.3 m Setting of DIP SW4 Setting of DIP SW5 1234 ON OFF ON OFF –––– ON OFF ON OFF OFF OFF OFF ON ON OFF OFF ON OFF ON OFF ON OFF OFF ON ON –––– ON ON OFF OFF OFF OFF OFF – ON ON ON – OFF OFF OFF – ON OFF OFF – OFF OFF ON – ON ON ON OFF PMFY -P-VBM-A PLFY -P-VLMD-A PDFY -P20 ~ 80V[...]

– 29 – 3 3 3 3 3 TEST RUN [1] Before T est Run (1) Check points before test run 1 Neither refrigerant leak nor loose power source/ transmission lines should be found. 2 Confirm that the resistance between the power source terminal block and the ground exceeds 2M Ω by measur- ing it with a DC 500 V megger . Do not run if it is lower than 2M ?[...]

– 30 – (3) Check points for test run when mounting options (4) Attention for mounting drain water lifting-up mechanism Built-in optional parts Content of test run Check point Result Mounting of drain water lifting-up mechanism Mounting of perme- able film humidifier Release connector of pump circuit, check error detection by pouring water into [...]

– 31 – (5) Check points for system structure In the case of the PURY -P400 · 500 YMF-C Check points from installation work to test run. Classification Portion Check item T rouble Installation and piping Power source wiring 1 2 3 4 5 6 7 8 9 1 2 3 4 Instruction for selecting combination of outdoor unit, and indoor unit followed? (Maximum number[...]

– 32 – Classification T ransmission line Portion Check item 1 Limitation of transmission line length followed? For example, 200m or less (total length : 500m) at the farthest. 2 1.25mm 2 or more transmission line used? (Remote controller 10m or less 0.75mm 2 ) 3 2-core cable used for transmission line? 4 T ransmission line apart from power sour[...]

– 33 – [2] T est Run Method Operation procedure 1 T urn on universal power supply at least 12 hours before starting → Displaying “ HO ” on display panel for about two minutes 2 Press TEST RUN button twice → Displaying “ TEST RUN ’’ on display panel 3 Press selection button → Make sure that air is blowing out 4 Press select butto[...]

– 34 – 4 GROUPING REGISTRA TION OF INDOOR UNITS WITH M-NET REMOTE CONTROLLER (1) Switch function • The switch operation to register with the remote controller is shown below: Registration/ ordinary mode selector switch Registration/ordinary mode selection switch Switch to assign indoor unit address Registration switch Confirmation switch Dele[...]

– 35 – (2) Attribute display of unit • At the group registration and the confirmation/deletion of registration/connection information, the type (attribute) of the unit is displayed with two English characters. Display T ype (Attribute) of unit/controller Indoor unit connectable to remote controller Outdoor unit BC controller (Master) BC contr[...]

– 36 – (3) Group registration of indoor unit 1) Registration method • Group registration of indoor unit ........................................................................ 1 The indoor unit to be controlled by a remote controller is registered on the remote controller . [Registration procedure] 1 With the remote controller under stopping[...]

– 37 – 2) Method of retrieval/confirmation • Retrieval/confirmation of group registration information on indoor unit .............. 2 The address of the indoor unit being registered on the remote controller is displayed. [Operation procedure] 1 With the remote controller under stopping or at the display of “ HO ” , continuously press the [...]

– 38 – 3) Method of deletion • Deletion of group registration information of indoor unit ...................................... 4 [Operation procedure] 1 With the remote controller under stopping or at the display of “ HO ” , continuously press the FILTER + switch ( A + B ) at the same time for 2 seconds to change to the registration mode[...]

– 39 – 4) Deletion of information on address not existing • Deletion of information on address not existing ................................................... 5 This operation is to be conducted when “ 6607 ” error (No ACK error) is displayed on the remote controller caused by the miss setting at test run, or due to the old memory remain[...]

–40– 5 5 5 5 5 CONTROL [1] Control of Outdoor Unit [1]- 1 PUR Y -P400·500 YMF-C (1) Initial processing • When turning on power source, initial processing of microcomputer is given top priority . • During initial processing, control processing corresponding to operation signal is suspended. The control processing is resumed after initial pr[...]

– 41 – • The operating temperature is 124 ° C (No. 1 compressor) or 1 15 ° C (No. 2 compressor). 4) Compressor frequency control 1 Ordinary control The ordinary control is performed after the following times have passed. • 30 seconds after the start of the compressor or 30 seconds after the completion of defrosting. • 30 seconds after f[...]

– 42 – Item At compressor is started Compressor stopped during cool- ing or heating mode After operation has been stopped During defrosting ((*1) in Fig below) During oil recovery operation When low pressure (Ps) has dropped during lower limit fre- quency operation(15 minutes af- ter start) When the high pressure (Pd) is risen up during lower l[...]

– 43 – (5) Oil return control (Electronic expansion valve (SLEV)) • The amount of opening of the oil-return LEV (SLEV) is determined as follows: in cooling, by the operating capacity of the No. 1 compressor and the ambient temperature; in heating, by the operating capacity of the No. 1 compressor . • It is opened (64pulses) when both compre[...]

– 44 – 5) Change in number of operating indoor units while defrosting • If the number of indoor units changes while the outdoor unit is defrosting, the defrosting operation continues. Once defrosting has ended, control for changing the number of units is performed. • If the indoor unit is stopped while the outdoor unit is defrosting or if t[...]

– 45 – TH9 F our-wa y valv e Compressor Accumulator CS circuit Separate compressor TH2 LPS Heat e xchanger Outdoor heat e xchanger Indoor heat e xchanger Flow control valv e Operation mode Full cooling Cooling mainly Full heating Heating mainly Defrosting ON ON OFF OFF OFF OFF ON ON OFF OFF OFF OFF OFF ON ON ON ON OFF ON ON ON ON ON OFF OFF ON [...]

– 46 – (1 1) Control at initial starting • When the ambient temperature is low (5 ° C or less in cooling and – 5 ° C or less in heating), initial starting will be performed if the unit is started within 4 hours of the power being turned on. • The following initial start mode will be performed when the unit is started for the first time [...]

– 47 – <Initial start control timing chart> Note 1: If the frequency of No. 1 compressor is above the specified level at the end of Step 2, the mode proceeds to Step 3. Note 2: At the completion of Step 2, if the frequency of No. 1 compressor is below the specified value and if Step 2 has been completed less than 3 times, the process does[...]

– 48 – (12) Emergency response operating mode The emergency operation mode is a mode in which the unit is run in an emergency to respond to the trouble when the compressors (No. 1, No. 2) break down, making it possible to carry out a abnormality reset using the remote control. 1) Starting the Emergency Operation Mode 1 T rouble occurs (Display [...]

– 49 – Mode Connection [2] Control of BC Controller (1) Control of SV A, SVB and SVC SV A, SVB and SVC are turned on and off depending on connection mode. Cooling Heating Stop Defrost SV A ON OFF OFF OFF SVB OFF ON OFF OFF SVC ON OFF OFF OFF (2) Control of SVM1 (only F A type) SVM1 is turned on and off corresponding to operation mode. Operation[...]

– 50 – YES NO YES NO YES YES NO NO Normal operations T rouble observed Stop Start Breaker turned on Set indoor ad- dress No. to remote controller Operation command Operation mode Error mode Cooling-only , Heating-only , Cooling/heating mixed Error stop Operation mode Operation mode 52C ON [3] Operation Flow Chart (1) Outdoor unit Note : 1 For a[...]

– 51 – (2) BC controller Note : 1 T wo error modes include indoor unit side trouble, BC controller trouble, and outdoor unit side trouble. In the case of indoor unit side trouble, error stop is observed in the concerned indoor unit only , and in the cases of BC controller and outdoor unit side troubles, error stop is observed in all the indoor [...]

– 52 – (3) Indoor unit YES NO YES NO YES NO YES NO YES NO YES NO YES NO YES NO Normal operations T rouble observed Stop Start Breaker turned on Operation SW turned on 1. Protection function self-holding cancelled. 2. Indoor unit LEV fully closed. Remove controller display extinguished 3-minute drain pupm ON F AN stop Drain pump ON Error mode Er[...]

– 53 – (4) Cooling operation YES NO YES YES NO NO 1. Inverter output 0Hz 2. Indoor unit LEV , oil return LEV 3. Solenoid valve OFF 4. Outdoor unit fan stop 5. BC controller solenoid valve OFF 6. BC controller LEV fully closed 1. Inverter frequency control 2. Indoor unit LEV , oil return LEV control 3. Solenoid valve control 4. Outdoor unit fan [...]

– 54 – YES YES NO YES YES NO NO NO (5) Heating operation Normal operations Defrosting operations Stop T est run 1. Indoor unit fan very low speed operations 2. Inverter output 0Hz 3. Indoor unit LEV , oil return LEV fully closed 4. Solenoid valve OFF 5. Outdoor unit fan stop 6. BC controller solenoid valve OFF 7. BC controller LEV fully closed [...]

– 55 – YES NO YES YES NO (6) Dry operation Normal operations Thermostat ON Stop 1. Indoor unit fan stop 2. Inverter output 0Hz 3. Indoor unit LEV , oil return LEV closed 4. Solenoid valve OFF 5. Outdoor unit fan stop 6. BC controller solenoid valve OFF 7. BC controller LEV fully closed 1. Outdoor unit (Compressor) intermit- tent operations 2. I[...]

– 56 – 1 Adjustment of super heat of heat exchanger outlet port of indoor unit during cooling. 2 Adjustment of sub-cool of heat ex- changer outlet port of indoor unit during heating. Indoor unit control (Thermostat). 1 Indoor unit control (Freeze preven- tion, hot adjust, etc.). 2 LEV control during heating (sub-cool detection). LEV control dur[...]

– 57 – 1 Detects the outdoor air temperature. 2 Performs fan control, liquid level heater control, opening settings of LEV for oil return and other functions. Thermistor R 0 = 15 k Ω B 1/80 = 3460 Rt = 15exp{3460( - )} 0 ° C: 15 k Ω 10 ° C: 9.7 k Ω 20 ° C: 6.4 k Ω 25 ° C: 5.3 k Ω 30 ° C: 4.3 k Ω 40 ° C: 3.1 k Ω Resistance ch[...]

– 58 – Resistance check Resistance check Conductivity check using tester . Belt heater AC 200 to 240 V MC1 1280 Ω 45 W MC2 400: 1280 Ω 45 W 500: 1029 Ω 56 W Code heater 2880 Ω (1440 Ω + 1440 Ω ) AC 220 to 240 V 20 W (10 W + 10 W) AC 220 to 240 V Not conducting : cooling cycle Conducting : heating cycle Refrigerant heating inside com[...]

– 59 – [5] Resistance of T emperature Sensor Thermistor for low temperature Thermistor R o = 15k Ω ± 3% (TH3 ~ 9) Thermistor R 120 = 7.465k Ω ± 2% (TH1, 10) R t = 15exp {3460 ( - )} R t = 7.465exp {4057 ( - )} Thermistor R o = 33k Ω ± 1% (TH2) Thermistor R 50 = 17k Ω ± 2% (THHS) R t = 33exp {3965 ( - )} R t = 17exp {4170 ( - )} 50 4[...]

–60– 1 2 3 4 5 During cooling operations, required refrigerant amount tends to increase (refrigerant in accumulator decreases) in proportion to increase in the number of operating indoor units. However , the change of increase rate is small. During heating operations, liquid level of accumulator is the highest when all the indoor units are oper[...]

– 61 – 3) Check the refrigerant volume by LED monitor display using the LED. Set the LED monitor display switch (SW1) as shown below and check the past information (history) concerning the refrigerant volume. Set SW1 as shown in he figure at right. If LD3 lights up, it indicates the refrigerant charge abnormal delay state just before emergency [...]

– 62 – TH1 SC1 1 SC16 Pd (High pressure) [3] Refrigerant V olume Adjustment Mode Operation (1) Procedure Depending on the operating conditions, it may be necessary either to charge with supplementary refrigerant, or to drain out some, but if such a case arises, please follow the procedure given below . Switching the function select switch (SW2-[...]

– 63 – (2) Refrigerant adjustment in Cooling season (Flow chart) In case of PUR Y -P400, 500YMF-C YES NO Adjustment starts. Start cooling operation of all indoor units in a test run mode. Note 1 Has the compressor been operated for more than 30min? W as the operation condition stabilized? The high pressure > 13kg/cm2G? TH1 ≤ 11 5 ˚ C? Are[...]

– 64 – (3) Refrigerant adjustment in heating season (Flow chart) In case of PUR Y -P400, 500YMF-C Start Adjustment Has the operating condition stabilized? Is the accumulator's liquid level AL = 0? Did the liquid level change from AL = 0 to AL = 1? Did the liquid level change from AL = 1 to AL = 0? Did the liquid level change from AL = 2 to[...]

– 65 – Note: 1 If there are any units which are not operating, it will cause refrigerant to accumulate, so by all means operate all the indoor units. Also, in order to prevent stable operation from being disrupted by the thermostat going OFF , set the trial operation mode. Note: 2 If the high pressure is stabilized, it is safe to judge that the[...]

– 66 – 7 7 7 7 7 TROUBLESHOOTING [1] Principal Parts Pressure Sensor (1) Judging Failure 1) Check for failure by comparing the sensing pressure according to the high pressure/low pressure pressure sensor and the pressure gauge pressure. T urn on switches 1, 3, 5, 6 (High) and 2, 4, 5, 6 (Low) of the digital display select switch (SW1) as shown [...]

– 67 – Solenoid V alve (SV1~8) Check if the control board ’ s output signals and the operation of the solenoid valves match. Setting the self-diagnosis switch (SW1) as shown in the figure below causes the ON signal of each relay to be output to the LED ’ s. Each LED shows whether the relays for the following parts are ON or OFF . When a LED[...]

– 68 – * Closed torque : 13kg · m (1.3N · m) The refrigerant flow is as following figure. Hot gas (high pressured) flows in cooling mode and cool gas/liquid (low pressured) flows in heating mode. Please refer to the Refrigerant Circuit Diagram. And, ON/OFF of Solenoid valve is depends on the amount of running indoor units, ambient temperature[...]

– 69 – Solenoid V alves Block2 1 3 2 4 CV5b CV7b SV7 SV8 Solenoid V alv es Block 2 CV4b CV6b CV2b ST1 BV1 BV2 CV3b 1 2 3 4[...]

– 70 – Check V alves Block1 The refrigerant flow in the pipe 6 , 7 , 8 and 9 are depend on ON/OFF of the SV3, 4, 5 and 6. Please confirm by LED monitor display . Y ou can open the cap of valve A, B and C, but 3 types of hexagon socket screw keys. The size is as follows. * Closed torque : A : 1.7kg · m (0.17N · m) B : 20kg · m (2.0N · m) C :[...]

– 71 – Check V alves Block2 1 3 5 7 6 4 2 CV5b CV4b CV6b CV2b ST1 BV1 BV2 CV3b Check V alv es Block2 1 3 7 2 4 5 6[...]

– 72 – Outdoor LEV The valve percentage opening changes in proportion to the number of pulses. (Connections between the outdoor unit ’ s MAIN board and SLEV , (PUR Y -P400 · 500YMF-C)) Output (phase) Output states Output pulses change in the following orders when the V alve is Closed 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 1 V alve i[...]

– 73 – 1 Disconnect the control board connector and connect the check LED as shown in the figure below . When the base power supply is turned on, the indoor LEV outputs pulse signals for 10 seconds, the outdoor LEV outputs pulse signals for 17 seconds, and BC controller outputs pulse signals for 10-20 seconds. If the LED does not light up, or l[...]

–74– Outdoor LEV (SLEV) Coil Removal Procedure (configuration) As shown in the figure, the outdoor LEV is made in such a way that the coils and the body can be separated. <Removing the Coils> Fasten the body tightly at the bottom (Part A in the figure) so that the body will not move, then pull out the coils toward the top. If they catch o[...]

– 75 – Intelligent Power Module (IPM) Measure resistances between each terminal of IPM with tester , and use the results for troubleshooting. Specified resistance value is dependent on tester type to be used for resistance measurement, because diode inside IPM has non-linearity , thus difference of impedance and voltage in tester being influent[...]

– 76 – (2) T rouble and remedy of remote controller (In the case of MA remote controller) Phenomena Factors Check method and handling 1 2 If pushing the remote control operation SW does not make a sound such as feep with the crystal display lamp out, and no operate is possible. (An appropriate display on the remote control is not on.) When turn[...]

– 77 – Phenomena Factors 3 When the remote control SW is turned on, the indication goes off after approximately 20- 30 seconds, and indoor unit stops. 1) Power supply from the transformer is not available to the control board of BC controller . 1 The original power supply of the BC controller is not turned on. 2 Removal of connectors (CN12, CN3[...]

– 78 – 4 “ HO ” indication on the remote controller is not lit, and the ON/OFF switch does not work. 1) The M-NET transmission power supply form the outdoor unit is not supplied. 1 The original power supply of Indoor Unit is not turned on. 2 The connector on the controller board in Indoor Unit is removed. Main board ----CNS1, CNVCC3 INV boa[...]

– 79 – (In the case of M-NET remote controller) Symptom Cause Checking method & countermeasure 1 2 Despite pressing of remote controller ON/OFF switch, operation does not start and there is no electronic sound. (No powering signal appears.) At about 10 seconds after turning remote controller operation switch ON, the display distinguishes an[...]

– 80 – Symptom Cause 3 “ HO ” display on re- mote controller does not disappear and ON/OFF switch is ineffective. (Without using MELANS) 1) Outdoor unit address is set to “ 00 ” 2) Erroneous address. 1 Address setting of indoor unit to be coupled with remote controller incorrect. (Indoor unit = remote controller - 100.) 2 Address settin[...]

– 81 – Symptom Cause Checking method & countermeasure 4 “ 88 ” appears on re- mote controller at registration and access remote controller a) Confirm the address of unit to be coupled. b) Check the connection of transmission line. c) Check the transmission terminal block voltage of unit to be coupled. i) Normal if voltage is DC17 ~ 30V [...]

– 82 – T ransmission Power Circuit (30 V) Check Procedure If “” is not displayed by the remote control, investigate the points of the trouble by the following procedure and correct it. No . Check Item Judgment Response 1 2 3 4 5 6 7 8 9 Disconnect the transmission line from TB3 and check the TB3 voltage. Check if the following connectors ar[...]

– 83 – (3) Investigation of transmission wave shape/noise Control is performed by exchanging signals between outdoor unit, indoor unit and remote controller by M-NET transmission. If noise should enter into the transmission line, the normal transmission will be hindered causing erroneous operation. 1) Symptom caused by the noise entered into tr[...]

– 84 – 3) Checking and measures to be taken (a) Measures against noise Check the items below when noise can be confirmed on wave shape or the error code in the item 1) is generated. Items to be checked Measures to be taken (b) When the wave height value of transmission wave shape is low , 6607 error is generated, or remote controller is under t[...]

– 85 – 4) Treatment of Inverter and Compressor T roubles If the compressor does not work when error codes 4240, 4250, 4340 or 4350 are detected, determine the point of malfunction by following the steps in the LED monitor display and countermeasures depending on the check code displayed , then perform the procedures below . No . Check Item Symp[...]

– 86 – 5) T reatment of Fan Motor Related T roubles Condition Possible Cause Check Method and T reatment 1 The fan motor will not run for 20 minutes or longer when the AK value is 10%. (When the MAIN board ’ s SW1 is set as shown below , the AK value is displayed by the service LED.) SW1 = 1110001000 2 The fan motor ’ s vibration is great. [...]

– 87 – 6) Troubleshooting at breaker tripping Check items Measures to be taken 1 Check the breaker capacity . 2 Check for a short circuit or grounding in the electrical system other than the inverter . 3 Check the resistance between terminals on the terminal block TB1A for power source. 4 Checking by powering again. 5 Operational check by opera[...]

– 88 – 7) Individual Parts Failure Judgment Methods. Part Name Judgment Method Diode Stack (DS) Refer to “ Judging Diode Stack Failure. ” Intelligent Power Module(IPM) Refer to “ Judging IPM Failure. ” Electromagnetic Contactor (52C) Measure the resistance value at each terminal. Rush Current Protection Resistor (R1, 5) Measure the resi[...]

– 89 – Motor (Compressor) G/A board Red UV W N P White Black Black Capacitor (C2,C3) Red IPM[...]

– 90 – (4) T roubleshooting the major components of the BC controller 1) Pressure sensor Pressure sensor troubleshooting flow Check on the LED monitor dis- play . • TH2 or LPS of outdoor unit. • HPS of outdoor unit • PS1, PS3 of BC controller and confirm the following relationship HPS > PS1 PS3 > TH2 or LPS (puressure calculated val[...]

– 91 – Note 1 : • Symptoms of incorrect i.e, reverse connection of PS 1 and PS 3 to BC controller board Note 2 : • Check using LED monitor display switch (outdoor MAIN board SW1) Note 3 : • Check CNP1 (liquid measurement) and CMP3 (intermediate) connectors on BC controller board for disconnection or looseness. Note 4 : • With the sensor[...]

–92– 2) T emperature Sensor Thermistor troubleshooting flow Start Disconnect applicable thermistor connector from the board. Measure temperature of applicable thermistor (actual measured value). Check thermistor resistance value. Compare temperature for thermistor resistance value with actual mea- sured valued. No difference? Insert applicable [...]

– 93 – T ouch the probes of the tester or other instrument to the shaded areas to measure. Thermistor R o =15 k Ω Rt=15exp 3460 ( – ) 1 ON 23 456789 1 0 1 ON 23 456789 1 0 1 ON 23 456789 1 0 1 ON 23 456789 1 0 Note 1 : • Board connector CN10 corresponds to TH1 1 through TH14, while connector CN1 1 corresponds to TH15 through TS15. Remove [...]

– 94 – No cooling No heating Check disconnection or looseness of connectors. Is there a problem? Operate in cooling or heating (1 system only when there are plural systems) Cooling or heating operation? Heating operation Note 1 Check if LEV 1 are fully open LEV 1 fully open? LEV3 are not controlled Check if LEV 1 are fully shut. Ye s Note 2 No [...]

– 95 – 1 LEV Note 1 : • Symptoms of incorrect connection to BC controller LEV board Improper installation is the same for 1 and 2 , so it is omitted here. Note 2 : Method for checking LEV full open, full closed condition 1 Check LEV full opening (pulse) using the LED monitor display (outdoor controller board SW1). Full opened: 2000 pulses Ful[...]

– 96 – 6 6 5 4 3 2 1 5 4 3 2 1 2 5 1 3 4 6 Brown Red Blue Orange Yellow White Brown Red Blue Orange Yellow White To LEV 10k Ω LED (Self-diagnostic monitor) Measured Data Signal OUTDOOR MAIN board SW1 Setting LEV1 pulse LEV 3 pulse LEV 3a pulse BC controller bypass output superheat BC controller intermediate subcool BC controller liquid subcoo[...]

– 97 – 2 Solenoid V alve Change the solenoid valve. Change the control board. 220-240V output? With the solenoid valve con- nector is disconnected from the board, use remote controller to turn on the unit and check the output (220-240V) from the controller board. Conductance present? Disconnect solenoid valve connector from the board and check [...]

– 98 – 1 B A Cooling Heating Stopped Defrosting SV A ON OFF OFF OFF SVB OFF ON OFF OFF SVC ON OFF OFF OFF Mode Branch port Normal Malfunction CNTR(1)-(3) Approximately 90 Ω Open or shorted CN03(1)-(3) Approximately 1.7 Ω * Disconnect the connector before measurement. CNTR CN03 BC Controller control board Red Blue Brown Brown 4) BC controlle[...]

– 99 – [2] BC Controller Disassembly Procedure (1) Service panel Be careful on removing heavy parts. Procedure Illustrations 1. Remove the two screws securing the electric panel box. Loosen the two screws securing the electric panel box, and then remove the box. 2. Remove the four screws securing the front panel and then remove the panel. 3. Re[...]

– 100 – (3) Thermistor (Liquid and gas piping temperature detection) Be careful when removing heavy parts. Procedure Photos 1. Remove the front panel 1 Use the procedure under (1)-1.2.3 to check TH1 1, TH12, TH15, and TH16. 2. Disconnect the piping sensor lead from the control- ler panel. 1 TH1 1 - TH12 (CN10) 2 TH15, TH16 (CN1 1) 3. Pull the t[...]

– 101 – (5) LEV Be careful on removing heavy parts. Procedure Photos 1. Remove the service panel. See (1)-1.2.3 2. Replace the applicable LEV . Important! 1 When performing the above procedure, be sure to allow for enough service space in the ceiling area for welding. 2 When conditions require, the unit can be lowered from the ceiling before st[...]

– 102 – Check Code List Check Code Check Content 0403 Serial transmission abnormality 0900 T rial operation 1102 Discharge temperature abnormality 1111 Low pressure saturation temperature sensor abnormality (TH2) 1112 Low pressure saturation Liquid level sensing temperature sensor abnormality (TH4) 1 1 13 temperature abnormality Liquid level se[...]

– 103 – Check Code Check Content 6606 Communications with transmission processor abnormality 6607 No ACK abnormality 6608 No response abnormality 6831 Abnormal MA communication receiving (No receiving) 6832 Abnormal MA communication receiving (Abnormal cycle recovery) 6833 Abnormal MA communication sending (H/W abnormality) 6834 Abnormal MA com[...]

– 104 – Checking code Meaning, detecting method Cause Checking method & Countermeasure Serial transmission abnormality 0403 If serial transmission cannot be established between the MAIN and INV boards. 1) Wiring is defective. 2) Switches are set wrong on the INV board. 3) A fuse (F01) on the INV board is defective. 4) The circuit board is d[...]

– 105 – Checking code Meaning, detecting method Cause Checking method & Countermeasure Discharge temperature abnormality (Outdoor unit) 1102 1. When 140 ˚ C or more discharge temperature is detected during operations (the first time), out- door unit stops once, mode is changed to restart mode after 3 minutes, then the outdoor unit restarts[...]

– 106 – Checking code Meaning, detecting method Cause Checking method & Countermeasure Low pressure saturation tempera- ture sensor abnormal- ity (TH2) Liquid level detecting tempera- ture sensor abnormal- ity (TH4) Liquid level detecting tempera- ture sensor abnormal- ity (TH3) 1111 1112 1113 1. When saturation temperature sensor (TH2) or [...]

–107– Checking code Meaning, detecting method Cause Checking method & Countermeasure 1301 1302 Low pressure abnoramlity High pressure abnoramlity 1 (Outdoor unit) When starting from the stop mode for the first time, (if at the start of bind power transmission, the end of bind power transmission, and in the mode when the thermostat goes OFF [...]

– 108 – Checking code Meaning, detecting method Cause Checking method & Countermeasure 1302 1368 1370 Liquid side Intermedi- ate side High pressure abnoramlity (BC controller) High pressure abnoramlity 2 (Outdoor unit) When press. sensor detects 1kg/ cm 2 G (0.098MPa) or less just be- fore starting of operation, erro stop is observed with c[...]

– 109 – Checking code Meaning, detecting method Cause Checking method 1500 1501 Insufficient refrigerant abnormality 1. When discharge superheart 10 deg is keeping for 10 minutes or discharge superheat 20 deg for 15 minutes, outdoor unit stops once, and after 3 minutes, the unit restarts. For 60 minutes after unit stopped is intermittent fault [...]

– 110 – Checking code Meaning, detecting method Cause Checking method & Countermeasure 1505 Judging that the state when the suction pressure reaches 0kg/ cm 2 G (0MPa) during compressor operation indicates high pressure by the discharge temperature and low pressure saturation tempera- ture, the back-up control by gas bypassing will be condu[...]

– 111 – Checking code Meaning, detecting method Cause Checking method & Countermeasure 4103 41 15 Reverse phase abnormality Power supply sync signal abnormality Reverse phase (or open phase) in the power system is being de- tected, so operation cannot be started. The frequency cannot be deter- mined when the power is switched on. (The power[...]

– 112 – Checking code Meaning, detecting method Cause Checking method & Countermeasure 4116 4200 Fan speed abnormality (motor abnoramlity) VDC sensor/circuit abnormality (Detects only for PKFY -V AM) 1 . Detecting fan speed below 180rpm or over 2000rpm dur- ing fan operation at indoor unit (first detection) enters into the 3-minute restart [...]

– 113 – 4220 4230 Bus voltage abnormality Radiator panel overheat protection 1 If VDC 400 V is de- tected during inverter operation. If the cooling fan stays ON for 5 minutes or longer dur- ing inverter operation, and if THHS 100 ° C is de- tected. 1) The power supply voltage is abnormal. 2) The wiring is defective. 3) The rush current prevent[...]

– 114 – Checking code Meaning, detecting method Cause Checking method & Countermeasure 4240 4250 Over loard protection IPM alarm output / Bus voltage abnormality If IAC 32 Arms is detected con- tinuously for 10 minutes during op- eration of the inverter after 5 or more seconds have passed since the inverter started. 1 If over current, overh[...]

– 115 – Checking code Meaning, detecting method Cause Checking method & Countermeasure 4260 5101 5102 5103 5104 5105 5106 5107 Cooling fan abnormality Thermal sensor abnormality (BC controlled) If the heat sink temperature (THHS) 100 ° C for 20 minutes or longer just before the inverter starts. <Other than THHS> 1 A short in the ther[...]

– 116 – Checking code Meaning, detecting method Cause Checking method & Countermeasure 5201 5201 5203 5301 Pressure sensor abnormality (outdoor unit) IAC sensor/ circuit abnormality Pressure sensor abnormality (BC controller) High pressure side Intermedi- ate 1 When pressue sensor detects 1kg/cm 2 G (0.098MPa) or less dur- ing operation, ou[...]

– 117 – Checking code Meaning, detecting method Cause Checking method & Countermeasure 5301 Different indoor model connected abnormality An exclusive R22 refrigerant indoor unit was connected to a R407C refrigerant outdoor unit. 1) An error was made in the MAIN board of the outdoor unit (replaced with the wrong circuit board). 2) An error w[...]

– 118 – (2) Communication/system Checking code 6600 6602 Multiple address error Transmission from units with the same address is detected. Note: The address/attribute shown on remote controller indicates the controller which has detected error . Transmission processor hardware error Though transmission processor intends to transmit “ 0 ” , [...]

– 119 – T ransmission processor hardware error T ransmission circuit bus-busy er- ror 1 Collision of data transmission: T ransmission can not be per- formed for 4~10 consecutive minutes due to collision of data transmission. 2 Data can not be transmitted on transmission line due to noise for 4~10 consecutive minutes. Note: The address/attribute[...]

– 120 – Checking code 6606 Meaning, detecting method Cause Checking method & Countermeasure 1) Data is not properly transmitted due to casual errouneous operation of the generating controller . 2) Faulty generating controller . Communications with transmis- sion processor error Communication trouble between apparatus processor and trans- mi[...]

– 121 – Checking code 6607 Meaning, detecting method No ACK error When no ACK signal is detected in 6 continuous times with 30 second interval by transmission side controller , the transmission side detects error . Note: The address/attribute shown on remote controller indicates the controller not providing the answer (ACK). 1 Outdoor unit (OC)[...]

– 122 – Checking code 6607 (continued) Meaning, detecting method System compo- sition Generating unit address Display of trouble Detecting method Cause Checking method & countermeasure No ACK error When no ACK signal is detected in 6 continuous times with 30 second interval by transmission side controller , the transmission side detects err[...]

– 123 – Checking code 6607 (continued) Meaning, detecting method System compo- sition Generating unit address Display of trouble Detecting method Cause Checking method & countermeasure No ACK error When no ACK signal is detected in 6 continuous times with 30 second interval by transmission side controller , the transmission side detects err[...]

– 124 – Checking code 6607 (continued) Meaning, detecting method System compo- sition Generating unit address Display of trouble Detecting method Cause Checking method & countermeasure No ACK error When no ACK signal is detected in 6 continuous times with 30 second interval by transmission side controller , the transmission side detects err[...]

– 125 – 1) T otal capacity of indoor units in the same refrigerant system exceeds the following: 2) Erroneous setting of OC model se- lector switch (SW3-10). 1) The Indoor unit model name (model code) connected is not connectable. Connectable range.....20~250 2 ) Erroneous setting of the switch (SW2) for setting of model name of Indoor unit con[...]

– 126 – Checking code 7102 7105 7107 71 1 1 7130 Meaning, detecting method Cause Checking method & Countermeasure Connected unit count over Address setting error • Erroneous setting of OC unit address • Erroneous setting of BC con- troller address Trouble source : Outdoor unit BC controller Branch No. setting error Can not operate becau[...]

–127– [4] LED Monitor Display (1) How to read LED for service monitor By setting of DIP SW1-1 ~ 1-8, the unit operating condition can be observed with the service LED on the control circuit board. (For the relation of each DIP SW to the content, see the table provided.) As shown in the figure below , the LED consist of 7 segments is put in 4 se[...]

– 128 – No SW 1234567890 Item Relay output dis- play 1, Light ON display 0000000000 0 Inspection display 1, OC error 0000~9999 (Address and error code inv er ted) 0000~9999 (Address and error code inv er ted) 0000~9999 1 ✩ 1000000000 Relay output dis- play 2 SV4a SV6a CH2, 3 52F Retry op- eration Emergency operation Com- pressor running Error[...]

– 129 – No SW 1234567890 Item Outdoor error de- lay history 1010100000 21 0000~9999 Inv er ter error details (0001 - 0009) Inv er ter error details (0001 - 0009) 0000~9999 23 1110100000 45 1011010000 22 0110100000 TH11 error TH12 error TH2 error TH3 error TH4 error TH5 error TH6 error TH7 error TH9 error TH10 error High pres- sure sen- sor erro[...]

– 130 – No SW 1234567890 Item ↑ ↑ ↑ 59 1101110000 60 0011110000 THHS data Low pressure sensor data 61 1011110000 62 0111110000 α oc 63 1111110000 α oc* 0~9 ("AL=" also display ed) 64 0000001000 Accumulator lev el 65 1000001000 HzAK increase/de- crease 66 0100001000 Difference from target Tc 67 1100001000 Difference from target[...]

– 131 – When error stop occurs, No.101 - 125 display the last data just before error stop which is stored in the service memory . No SW 1234567890 Item ↑ ↑ 98 0100011000 99 1100011000 COMP2 operating time, Upper four figures Lower f our figures Lower f our figures 100 0010011000 101 1010011000 Relay output dis- play 1, Light displa y 102 01[...]

– 132 – No SW 1234567890 Item ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 1101000100 0011000100 IC13 suction temperature IC14 suction temperat[...]

– 133 – No SW 1234567890 Item ↑ ↑ 184 0001110100 185 1001110100 IC10SH IC9SH IC11SH 186 0101110100 187 1101110100 IC12SH ↑ ↑ 188 0011110100 IC13SH ↑ 189 1011110100 IC14SH ↑ ↑ 195 1100001100 IC4SC ↑ 196 0010001100 IC5SC ↑ 197 1010001100 IC6SC ↑ 198 0110001100 IC7SC ↑ 199 1110001100 IC8SC ↑ 200 0001001100 IC9SC ↑ 201 100[...]

– 134 – No SW 1234567890 Item 0002:Cooling 0001:F an 0003:Heating 0004:Dry 0000:Stop 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 1010011100 0110011100 1110011100 0001011100 1001011100 0101011100 1101011100 0011[...]

– 135 – No SW 1234567890 Item 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 0100100010 1100100010 0010100010 1010100010 0110100010 1110100010 0001100010 1001100010 0101100010 1101100010 0011100010 1011100010 0111[...]

– 136 – No SW 1234567890 Item 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 1111110010 0000001010 1000001010 0100001010 1100001010 0010001010 1010001010 0110001010 1110001010 0001001010 1001001010 0101001010 1101[...]

– 137 – No SW 1234567890 Item 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 0011011010 1011011010 0111011010 1111011010 0000111010 1000111010 0100111010 1100111010 0010111010 1010111010 0110111010 1110111010 0001[...]

– 138 – No SW 1234567890 Item 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 1001100110 0101100110 1101100110 0011100110 1011100110 0111100110 1111100110 0000010110 1000010110 0100010110 1100010110 0010010110 1010[...]

– 139 – No SW 1234567890 Item 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 0110001110 1110001110 IC24SC IC23SC 0001001110 1001001110 0101001110 1101001110 0011001110 1011001110 0111001110 1111001110 0000101110 1[...]

– 140 – No SW 1234567890 Item ↑ ↑ 499 1100111110 500 0010111110 IC21 filter IC20 filter IC22 filter 501 1010111110 502 0110111110 IC23 filter ↑ ↑ 503 1110111110 IC24 filter 504 0001111110 510 0111111110 511 1111111110 505 1001111110 506 0101111110 507 1101111110 508 0011111110 0000~9999 Remarks Display LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8 50[...]

–141– 8 PREP ARA TION, REP AIRS AND REFRIGERANT REFILLING WHEN REP AIRING LEAKS [1] Location of leaks: Extension piping or indoor units (when cooling) (Pump down operation) 1 Attach a pressure gage to the low-pressure servicing check joint (CJ2). 2 Stop all of the indoor units. When the compressor has stopped, shut of f the liquid ball valve (B[...]

– 142 – 12 34 56 7 89 1 0 ON 1 ON 23 456789 1 0 3 Stop all indoor units and the compressor . 1. With SW3-1 on the MAIN board of the outdoor unit set to ON and SW3-2 ON → OFF to stop all indoor units and the compressor . 2. Check that all indoor units have been stopped. 4 Close both ball valves (BV1 and BV2). 5 Remove a small amount of refrige[...]

– 143 – [4] Location of leaks: Outdoor unit (when heating) 1 Remove any refrigerant from the entire system (outdoor unit, extension piping and indoor units). Reclaim the refrigerant; do not discharge it into the air . 2 Repair the leaks. 3 After the leaks are repaired, replace the dryer with a new one and extract all of the air from the entire [...]

– 144 – YES YES YES YES YES NO NO NO NO NO Start T est run all indoor units. Is the refrigerant composition of α OC correct? (Note 2) Finished checking the composition. Check TH2, TH9, LPS and the CS circuit block and correct any malfunc- tions. (Note 3) I s the refrigerant composi- tion of α OC correct? (Note 2) Finished checking the composi[...]

– 145 – Note 1 W ait until the units stabilize as described in the refrigerant amount adjustment procedure in “ Chapter 6 ” . Note 2 After the units are operating stably , check that the refrigerant composition of α OC is within the following ranges, indicating that the composition check is finished. If the accumulator liquid level AL = 0 [...]

AIR CONDITIONERS CITY MUL TI Models PURY-P400, P500YMF-C Service Handbook Service Handbook PUR Y -P400, P500YMF-C HEAD OFFICE MITSUBISHI DENKI BLDG. MARUNOUCHI TOKYO 100-0005 TELEX J24532 CABLE MELCO TOKYO New publication effective Aug 2002 Specifications subject to change without notice. Service Handbook PURY-P400, P500YMF-C Issued in Aug 2002 F11[...]