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Mitsubishi Electronics MUZ-GB50VA manual

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Table of contents for the manual

  • Page 1

    SER VICE MANUAL CONTENTS 1. TECHNICAL CHANGES ····································2 2. P ART NAMES AND FUNCTIONS ······················3 3. SPECIFICA TION ·················································3 4. NOISE CRITERIA CUR VES ·····?[...]

  • Page 2

    2 1 TECHNICAL CHANGES MUZ-GA50V A - ➔ MUZ- GB50V A - E1 E1 1. Refrigerant filling capacity has been changed. 2. Outdoor electronic control P .C. board has been changed. Revision A: • Compressor has been changed. Previous New Model SNB130FLDH SNB130FLDH1 RoHS P ARTS LIST number E12 851 900 E12 939 900 OB455A--1qxq 06.7.31 2:19 PM Page 2[...]

  • Page 3

    3 P ART NAMES AND FUNCTIONS 2 3 SPECIFICA TION Air inlet Piping Air outlet (back and side) Drain hose Drain outlet MUZ-GB50V A Outdoor model Function Power supply Capacity Rated frequency(Min.-Max.) Dehumidification Air flow ✽ 1 (High/Low) Power outlet Running current ✽ 1 Power input ✽ 1 Power factor ✽ 1 Starting current ✽ 1 Compressor mo[...]

  • Page 4

    4 Specifications and rating conditions of main electric parts Model Item Current transformer Current transformer Smoothing capacitor Fuse Fuse Fuse Expansion valve coil Intelligent power module Intelligent power module Reactor Power factor controller Resistor Resistor Resistor Solenoid coil relay T erminal block T erminal block Relay R.V . coil MUZ[...]

  • Page 5

    5 4 NOISE CRITERIA CUR VES OUTDOOR UNIT MICROPHONE 1m COOLING FUNCTION SPL(dB(A)) LINE High F AN SPEED HEA TING 52 55 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC-60 NC-50 NC-40 NC-30 NC-20 NC-70 BAND CENTER FREQUENCIES, Hz T est conditions, Cooling : Dry-bulb temperature 35 : Wet-bulb temperature 24 : APPROXIMA TE THRESHOLD OF [...]

  • Page 6

    6 OUTLINES AND DIMENSIONS 5 Unit: mm OUTDOOR UNIT MUZ-GB50V A 30 - 35 - 155 90 198 40 515 299 66 34 51 330 360 850 430 500 80 121 840 Open as a rule 500mm or more if the front and both sides are open 100mm or more 200mm or more if there are obstacles to both sides Open as a rule 500mm or more if the back, both sides and top are open 350mm or more 1[...]

  • Page 7

    7 WIRING DIAGRAM 6 MUZ-GB50V A R64B YLW 230V~ 12-24V CN912 CN663 WHT BLU NOISE FILTER P.C.BOARD BRN TO INDOOR UNIT CONNECTING RED S3 RT65 2 1 CN61 1 3 GRN/YLW 5 PFC GRN LD9 POWER BOARD RT64 2 1 CN3 RED WHT RS2 RS1 R64A RS3 RS4 F801 CN901 NR64 ELECTRONIC CONTROL P.C.BOARD CB1 CB2 CB3 HC930 IPM NF BLK BLK BLK BLK WHT RED YLW BLU ORN PNK GRY BLU WHT G[...]

  • Page 8

    8 7 REFRIGERANT SYSTEM DIAGRAM MUZ-GB50V A OUTDOOR UNIT Unit:mm Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve Stop valve (with service port) Capillary tube [ 3.6 ✕ [ 2.4 ✕ 50 Refrigerant flow in cooling Compressor 4-way valve Refrigerant flow in heating Refrig[...]

  • Page 9

    9 PERFORMANCE CUR VES 8 The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions. Since operating conditions vary according to the areas where these units are installed. The following information has been provided to clarify the operating characteristics of the air conditioner un[...]

  • Page 10

    10 Indoor air Dry-bulb temperature difference ( : ) In d o o r in ta k e a ir D r y -b u lb te m p e r a tu r e ( : ) Outdoor intake air Wet-bulb temperature ( : ) Outdoor intake air Wet-bulb temperature ( : ) In d o o r in ta k e a ir D r y -b u lb te m p e ra tu r e ( : ) 24.1 22.3 20.4 18.5 16.7 14.8 13.0 11.1 Rated frequency 82Hz MUZ-GB50VA MSZ[...]

  • Page 11

    11 COOL operation 1 Both indoor and outdoor unit are under the same temperature/humidity condition. 2 Operation : TEST RUN OPERA TION (refer to 8-3.) Dry-bulb temperature( : ) Relative humidity(%) 20 50 25 60 30 70 8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT Ambient temperature(˚C) Ambient humidity(%) 18 32 15 20 50 25 60 30 70 (%) 35(˚C) [...]

  • Page 12

    12 MSZ-GB50V A : MUZ-GB50V A 21 18 5.88 3.00 0.51 1320 5.63 2.87 0.51 1386 5.40 2.75 0.51 1452 5.20 2.65 0.51 1518 21 20 6.13 2.39 0.39 1386 5.88 2.29 0.39 1469 5.70 2.22 0.39 1502 5.50 2.15 0.39 1568 22 18 5.88 3.23 0.55 1320 5.63 3.09 0.55 1386 5.40 2.97 0.55 1452 5.20 2.86 0.55 1518 22 20 6.13 2.63 0.43 1386 5.88 2.53 0.43 1469 5.70 2.45 0.43 15[...]

  • Page 13

    13 21 18 4.90 2.50 0.51 1617 4.50 2.30 0.51 1716 4.30 2.19 0.51 1749 21 20 5.15 2.01 0.39 1683 4.80 1.87 0.39 1766 4.60 1.79 0.39 1815 22 18 4.90 2.70 0.55 1617 4.50 2.48 0.55 1716 4.30 2.37 0.55 1749 22 20 5.15 2.21 0.43 1683 4.80 2.06 0.43 1766 4.60 1.98 0.43 1815 22 22 5.45 1.69 0.31 1749 5.10 1.58 0.31 1848 4.90 1.52 0.31 1881 23 18 4.90 2.89 0[...]

  • Page 14

    14 PERFORMANCE DA T A HEA T operation CAPACITY:5.8(kW) INPUT:1700(W) OUTDOOR WB( : ) INDOOR -10 -5 0 5 10 15 20 DB( : ) Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT 15 21 26 3.65 1105 4.41 1326 5.16 1496 5.92 1615 6.67 1717 7.37 1768 8.12 1802 3.48 1190 4.18 1411 4.93 1564 5.63 1683 6.38 1768 7.08 1819 7.80 1887 3.13 1275 3.89 1496 4.58 [...]

  • Page 15

    15 10 TROUBLESHOOTING 3. T roubleshooting procedure 1) First, check if the OPERA TION INDICA TOR lamp on the indoor unit is flashing on and off to indicate an abnormality . T o make sure, check how many times the abnormality indication is flashing on and off before starting service work. 2) Before servicing check that the connector and terminal are[...]

  • Page 16

    16 Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (10-4.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur [...]

  • Page 17

    17 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure Note1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly. 2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized. W 2.Blinking patt[...]

  • Page 18

    18 OFF None (Normal) 2-time flash 3-time flash 4-time flash 5-time flash 6-time flash 7-time flash 8-time flash Lighting Lighting Lighting Once Lighting Once Lighting Twice Lighting 3 times Lighting 4 times Lighting 9 times Once Goes out Lighting Lighting Lighting Lighting 3 times Goes out 4 times Goes out Lighting Lighting Lighting Lighting Lighti[...]

  • Page 19

    19 11-time flash • Check the connecting wire between outdoor electronic control P.C. board and power board. • Replace the power board. • Check the connecting wire among electronic control P.C. board, noise filter P.C. board and power board. • Replace the power board. When the communication between boards protection stop is continuously perf[...]

  • Page 20

    20 Start Indoor unit operates. Outdoor unit doesn't operate. Indoor unit doesn't receive the signal from remote controller . OPERA TION INDICA TOR lamp on the indoor unit is flashing on and off. Outdoor unit operates only in T est Run operation. (Refer to 8-3.) w Outdoor unit doesn't operate even in T est Run operation. (Refer to 8-3[...]

  • Page 21

    21 LED1(Red) LED2(Yellow) Lightning Twice Outdoor power system • Check the connection of the compressor connecting wire. • Refer to 10-6. A "How to check inverter/compressor". • Check the stop valve. Lightning 3 times Discharge temperature thermistor • Refer to 10-6. B "Check of outdoor thirmistors". • Refer to 10-6. B[...]

  • Page 22

    22 Primary current protection Secondary current protection High-pressure protection Defrosting in cooling 3 times Lighting Discharge temperature protection • Check refrigerant circuit and refrigerant amount. • Refer to 10-6. G "Check of LEV". • Refer to 10-6. B "Check of outdoor thermistors". 4 times Lighting Low discharge[...]

  • Page 23

    23 Part name Figure Check method and criterion Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) Normal 2.6k " ~ 3.3k " Normal 0.40 " ~ 0.49 " Discharge temperature thermistor (RT62) Fin temperature thermistor (RT64) Measure the resistance between terminals using[...]

  • Page 24

    24 10-6. T roubleshooting flow MUZ-GB50V A A A How to check inverter/ compressor No No Ye s Ye s Ye s No Ye s No Disconnect the terminal of the compressor . 3 minutes after turning on the power supply , start EMERGENCY OPERA TION. Is output balanced? Clarify the causes by counting time until the inverter stops. 0 to 10 seconds: compressor rare shor[...]

  • Page 25

    25 B B Check of outdoor thermistors • When OPERA TION INDICA TOR lamp flashes 6-time. • When thermistor is abnormal. Ye s Ye s No No Reconnect the connector CN661, CN663 and CN3. 3 minutes after turning on the power supply , start EMERGENCY OPERA TION. Defrost Discharge temperature Outdoor heat exchanger temperature Ambient temperature Fin temp[...]

  • Page 26

    26 C C Check of R.V . coil No Ye s No Ye s No Ye s No Ye s No Ye s 1. Disconnect the lead wire leading to the compressor . 2. 3 minutes after turning on the power supply , start EMERGENCY OPERA TION in HEA T mode. Is there voltage of 230V AC between pin1 and pin 2 at connector CN912? W T urn off power supply of indoor and outdoor unit. 1. Turn of f[...]

  • Page 27

    27 D D Check of outdoor fan motor • Fan motor does not operate or stops operating shortly after starting the operation. Ye s No No Ye s Ye s No (Fixed to either 5V or 0V DC) Check the connection between the connector CN931 and CN932. Disconnect CN932 from outdoor electronic control P .C. board, and turn on the power supply . Rotate the outdoor fa[...]

  • Page 28

    28 Outdoor unit does not operate at all, or stops immediately due to overcurrent. F F Check of current-limiting resistor ● Check other electric parts in the main circuit together in the case that the current-limiting resistor is defective. Turn ON the power supply and press EMERGENCY OPERATION switch. Replace the outdoor electronic control P.C. b[...]

  • Page 29

    29 H H How to check mis-wiring and serial signal error (when outdoor unit does not work) • When unit cannot operate neither by the remote controller nor by EMERGENCY OPERA TION switch. Indoor unit does not operate. • When OPERA TION INDICA TOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn’t operate. Is there rated voltage in[...]

  • Page 30

    30 I I Electromagnetic noise enters into TV sets or radios Replace or repair the antenna. Replace or repair the coaxial cable. No No No Yes Yes No No Yes Yes Yes Is the distance between the antennas and the indoor unit within 3m, or is the distance between the antennas and the outdoor unit within 3m? Is the distance between the TV sets or radios an[...]

  • Page 31

    31 1. Outdoor electronic control P .C. board MUZ-GB50V A LED 1 LED 2 CN801 325V DC ~ 370V DC Input ( ( CN932 20-90V AC GND 5V 5V DC pulse wave ( To f a n motor Defrost thermistor (RT61) Discharge temperature thermistor (RT62) Outdoor heat exchanger temperature thermistor (RT68) ( ( (+) (–) (+) Rush current relay (–) R.V . coil (–) ( 12V DC 15[...]

  • Page 32

    32 { CN912 R.V . coil 230V AC 230V AC Input 230V AC Output { { CN901 T o electronic control P .C. board MUZ-GB50V A F64 FUSE 2A/250V F91 1 FUSE 1A/250V 2. Noise filter P .C. board CN902 T o power board CN903 T o power board { 230V AC Output NR64 V ARISTOR OB455 A--2qxp 06.7.31 2:50 PM Page 32[...]

  • Page 33

    33 MUZ-GB50V A 3. Outdoor power board 325-370V DC Output (Red) (White) Connect to the compressor V oltage among phases: 5V to 180V Connect to the earth CN5 Primary current detection (Connect to the noise filter) CN2 Connect to the controller board (+)1-5(–): Signal transmission (T o electronic control P .C. board) 5V DC pulse wave (+)2-5(–): Ze[...]

  • Page 34

    34 DISASSEMBL Y INSTRUCTIONS 11 (1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the locking mechanism. 1 Slide the sleeve. 2 Pull the terminal while pushing the locking lever . 1 Hold the sleeve, and pull out the terminal slowly . The terminal which has the locking mechanism can be detache[...]

  • Page 35

    35 OPERA TING PROCEDURE PHOTOS 2. Removing the inverter assembly , inverter P .C. board and power board (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel.(Refer to 1.) (3) Disconnect the following connectors; <Electronic control P .C. board> CN931 and CN932 (Fan motor) CN795 (LEV) CN661 (Discharge te[...]

  • Page 36

    36 5. Removing outdoor fan motor (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel. (Refer to 1.) (3) Remove the inverter assembly . (Refer to 2.) (4) Remove the propeller . (5) Remove the screws fixing the fan motor . (6) Remove the fan motor . Photo 7 OPERA TING PROCEDURE PHOT OS 4. Removing the defrost [...]

  • Page 37

    37 OPERA TING PROCEDURE PHOTOS Photo 8 6. Removing the compressor and 4-way valve (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel. (Refer to 1.) (3) Remove the inverter assembly . (Refer to 2.) (4) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0[...]

  • Page 38

    38 12 RoHS P ARTS LIST (RoHS compliant) 4 17 1 12 9 11 2 5 6 7 8 15 13 18 20 21 22 23 27 28 29 3 10 14 16 19 26 25 24 MUZ-GB50V A 12-1. OUTDOOR UNIT STRUCTURAL P ARTS, ELECTRICAL P ARTS AND FUNCTIONAL P ARTS OB455 A--2qxp 06.7.31 2:50 PM Page 38[...]

  • Page 39

    39 RoHS Symbol in Wiring Diagram Q'ty/unit Remarks Part No. No. Part Name MUZ-GB 50V A - E1 E12 819 297 E12 851 630 E12 938 301 E12 851 501 E12 851 290 E12 819 232 E12 819 009 E12 819 521 E12 065 506 E12 939 900 E12 851 661 E12 821 662 E12 851 640 E12 851 493 E12 935 490 E12 891 961 E12 819 650 E12 819 245 E12 A88 450 E12 935 374 E12 823 375 E[...]

  • Page 40

    HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAP AN C C Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO.,L TD Distributed in Aug. 2006. No. OB455 REVISED EDITION-A 6 Distributed in Mar . 2006. No. OB455 6 Made in Japan New publication, effective Aug. 2006 Specifications subject to change without notice. MUZ-GB50V A 12-[...]