Revision A: • 3. SPECIFICATION has been corrected. OBH821 is void. OUTDOOR UNIT HFC SERVICE MANUAL utilized No. OBH821 REVISED EDITION-A R410A Models MUZ-JP09WA MUZ-JP12WA - U1 - U1 Indoor unit service manual MSZ-JP•WA Series (OBH820) CONTENTS MUZ-JP09WA 1. TECHNICAL CHANGES ······························3 2. PART NAMES AND FUNCTIONS ··················4 3. SPECIFICATION ········································5 4. OUTLINES AND DIMENSIONS ·····················8 5.
Use the specified refrigerant only Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions. Revision A: • 3. SPECIFICATION has been corrected.
1 TECHNICAL CHANGES MUZ-JP09WA MUZ-JP12WA - U1 U1 1.
2 PART NAMES AND FUNCTIONS MUZ-JP09WA MUZ-JP12WA Air inlet (back and side) Piping Air outlet Drain hose Drain outlet OBH821A 4
3 SPECIFICATION MUZ-JP09WA Outdoor unit model Capacity Cooling 1 Rated (Minimum~Maximum) Heating 47 1 Btu/h Btu/h Capacity Heating 17 2 Btu/h Power consumption Cooling 1 Rated (Minimum~Maximum) Heating 47 1 W W 750 (240 - 850) 900 (240 - 1,000) Power consumption Heating 17 2 W 700 (780) Rated (Maximum) Rated (Maximum) EER 1 [SEER] 3 HSPF IV 4 COP Cooling Heating Heating 1 Cooling Power factor Heating Power supply V, phase, Hz Max. fuse size (time delay) Min.
MUZ-JP12WA Outdoor unit model Capacity Cooling 1 Rated (Minimum~Maximum) Heating 47 1 Btu/h Btu/h 12,000 ( 3,800 ~ 12,200 ) 12,200 ( 4,500 ~ 14,500 ) Capacity Heating 17 2 Btu/h 7,600 (9,000) Power consumption Cooling 1 Rated (Minimum~Maximum) Heating 47 1 W W 1,210 (240 - 1,300) 990 (240 - 1,220) Power consumption Heating 17 2 W 800 (990) Rated (Maximum) Rated (Maximum) EER 1 [SEER] 3 HSPF IV 4 COP Cooling Heating Heating 1 Cooling Power factor Heating Power supply V , phase , Hz Ma
Test condition 3, 4 ARI Mode Indoor air condition (°F) Dry bulb Wet bulb Test Outdoor air condition (°F) Dry bulb Wet bulb "A-2" Cooling steady state at rated compressor speed 80 67 95 (75) "B-2" Cooling steady state at rated compressor speed 80 67 82 (65) SEER "B-1" Cooling steady state (Cooling) at minimum compressor speed 80 67 82 (65) "F-1" Cooling steady state at minimum compressor speed 80 67 67 (53.
4 OUTLINES AND DIMENSIONS MUZ-JP09WA MUZ-JP12WA Unit: inch *1 4 in. (100 mm) or more when front and sides of the unit are clear clear *1 REQUIRED SPACE 4 in .( or 100 m mo re m) ) mm 00 . (2 ore *2 n i 8 rm o 14 in. ( or m350 m ore m) *2 When any 2 sides of left, right and rear of the unit are clear holes Liquid refrigerant pipe joint Refrigerant pipe (flared) Ø 1/4 Gas refrigerant pipe joint Refrigerant pipe (flared) Ø 3/8 OBH821A 8 ) mm 00 re 1 ( o n.
5 WIRING DIAGRAM MUZ-JP09WA MUZ-JP12WA OBH821A 9
6 REFRIGERANT SYSTEM DIAGRAM MUZ-JP09WA MUZ-JP12WA Unit: Inch (mm) Refrigerant pipe ø3/8 (ø9.52) (with heat insulator) 4-way valve Muffler Stop valve (with service port) Flared connection Discharge temperature thermistor RT62 Outdoor heat exchanger Muffler Outdoor heat exchanger temperature thermistor RT68 Service port Ambient temperature thermistor RT65 Compressor Service port Defrost thermistor RT61 Strainer #100 Capillary tube O.D. 0.118 × I.D. 0.055 LEV × 10-1/4 (ø3.0 × ø1.
7 DATA MUZ-JP09WA MUZ-JP12WA 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Model MUZ-JP09WA MUZ-JP12WA IWB (˚F) TC 75 SHC TPC TC Outdoor intake air DB temperature (˚F) 85 95 105 SHC TPC TC SHC TPC TC SHC TPC TC 115 SHC TPC 71 11.0 7.6 0.67 10.3 7.1 0.73 9.7 6.6 0.79 9.0 6.2 0.83 8.3 5.7 0.86 67 10.4 8.6 0.63 9.7 8.0 0.69 9.0 7.4 0.75 8.4 6.9 0.80 7.7 6.3 0.83 63 9.8 9.4 0.60 9.1 8.7 0.66 8.5 8.1 0.72 7.7 7.3 0.77 7.0 6.7 0.80 71 14.7 9.
7-2. PERFORMANCE CURVE Cooling Capacity correction factors Indoor air Wet-bulb temperature difference (°F) Cooling capacity (at Rated frequency) 1.5 Indoor intake air Wet-bulb temperature( F) 1.4 1.3 1.2 79 1.1 75 1.0 0.9 14 23 32 41 50 59 68 77 86 95 104 72 68 64 113 Outdoor intake air DB temperature(°F) MUZ-JP12WA SHF at rating condition = 0.82 Airflow = 399 CFM 1.0 0.9 Total power consumption (kW) Total power consumption (kW) MUZ-JP09WA 71 67 63 0.8 0.7 0.6 take door in 0.
7-3. CONDENSING PRESSURE Cooling Data are based on the condition of indoor humidity 50 %. Air flow should be set to High speed.
Heating Data are based on the condition of outdoor humidity 75%. Air flow should be set to High speed. Data are for heating operation without any frost.
7-4. STANDARD OPERATION DATA Model MSZ-JP09WA Item Total Capacity Unit Cooling Heating Btu/h 9,000 10,900 SHF — 0.82 — Input kW 0.750 0.900 Rated frequency Hz 61.0 Indoor unit Electrical circuit Power supply V, phase, Hz Input Fan motor current kW 0.022 0.023 A 0.37 0.38 MUZ-JP09WA Power supply V, phase, Hz Comp. current Fan motor current Refrigerant circuit 115, 1, 60 Outdoor unit Input 115, 1, 60 kW 0.728 0.877 A 6.15 7.38 A 0.48 0.
7-4. STANDARD OPERATION DATA Model MSZ-JP12WA Item Total Capacity Unit Cooling Heating Btu/h 12,000 12,200 SHF — 0.77 — Input kW 1.210 0.990 Rated frequency Hz 91.0 Indoor unit Electrical circuit Power supply V, phase, Hz Input Fan motor current kW 0.022 0.023 A 0.37 0.38 MUZ-JP12WA Power supply V, phase, Hz Comp. current Fan motor current Refrigerant circuit 115, 1, 60 Outdoor unit Input 115, 1, 60 kW 1.188 0.967 A 10.35 8.18 A 0.48 0.
7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-JP09WA Correction of Cooling capacity Capacity correction factors 1.5 1.5 Correction of Cooling total input 1.5 Correction of Heating capacity Correction of Heating total input 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 0.0 0 50 100 0.0 0 50 100 0.0 0 50 100 150 The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ-JP12WA 1.
8 ACTUATOR CONTROL MUZ-JP09WA MUZ-JP12WA 8-1. OUTDOOR FAN MOTOR CONTROL The fan motor turns ON/OFF, interlocking with the compressor. [ON] The fan motor turns ON 5 seconds before the compressor starts up. [OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running. 5 seconds 15 seconds ON Compressor OFF ON Outdoor fan motor OFF 8-2. R.V. COIL CONTROL Heating . . . . . . . . . . . . . . . . . ON Cooling . . . . . . . . . . . . . . . . . OFF Dry . . . . . . . . . . . . . . . . . .
9 SERVICE FUNCTIONS MUZ-JP09WA MUZ-JP12WA 9-1. CHANGE IN DEFROST SETTING Changing defrost finish temperature To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board (Refer to 10-6.1.). Jumper JS Defrost finish temperature MUZ-JP09/12 Soldered (Initial setting) 50°F (10°C) None (Cut) 55.4°F (13°C) 9-2.
10 TROUBLESHOOTING MUZ-JP09WA MUZ-JP12WA 10-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, then after confirming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
10-2. FAILURE MODE RECALL FUNCTION 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 (10-3.) disappears, the memorized failure details can be recalled. 1. Flow chart of failure mode recall function for the indoor/outdoor unit Operational procedure The cause of abnormality cannot be found because the abnormality does not recur.
2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function. With the remote controller headed towards the indoor unit, press TOO COOL button to adjust the set temperature to 77°F (25°C).
3. Table of outdoor unit failure mode recall function NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). MUZ-JP09WA MUZ-JP12WA OPERATION Abnormal point INDICATOR (Failure mode / protection) upper lamp (Indoor unit) OFF None (Normal) 2-time blink Outdoor power system 2.5 seconds OFF 3-time blink 2.5 seconds OFF 4-time blink 2.5 seconds OFF LED indication (Outdoor P.C. board) — — Discharge temperature thermistor Defrost thermistor 1-time blink every 2.
NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). OPERATION INDICATOR Abnormal point upper lamp (Failure mode / protection) (Indoor unit) 11-time blink Bus-bar voltage (DC) 2.5 seconds OFF Each phase current of compressor 12-time blink Overcurrent Compressor open2.5 seconds phase OFF 13-time blink Abnormal of wrong voltage 2.5 seconds power supply connected. OFF 14-time blink Stop valve (Closed valve) 2.
10-3. TROUBLESHOOTING CHECK TABLE No. 1 Symptom Outdoor unit does not operate. Abnormal point/ Condition 1-time blink every Outdoor power sys2.5 seconds tem LED indication Condition Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started. Remedy • Reconnect connector of compressor. • Refer to 10-5. "How to check inverter/compressor". • Check stop valve. Outdoor thermistors 2 3 6-time blink 2.5 seconds OFF 9-time blink 2.
No. Symptom 17 Outdoor unit operates. LED indication 1-time blink 2.5 seconds OFF 3-time blink 2.5 seconds OFF 18 4-time blink 2.5 seconds OFF 19 20 5-time blink 2.5 seconds OFF 21 7-time blink 2.5 seconds OFF 8-time blink 2.5 seconds OFF Abnormal point/ Condition Condition Frequency drop by Current from power outlet is nearing Max. fuse size.
10-4. TROUBLE CRITERION OF MAIN PARTS MUZ-JP09WA MUZ-JP12WA Part name Defrost thermistor (RT61) Check method and criterion Fin temperature thermistor (RT64) Measure the resistance with a tester. Ambient temperature thermistor (RT65) Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, for the chart of thermistor. Figure Outdoor heat exchanger temperature thermistor (RT68) Discharge temperature thermistor (RT62) Measure the resistance with a tester.
10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IC700) See 10-5. Check the voltage between terminals. Are the voltages balanced? Yes No Replace the inverter P.C. board. See 10-5. Check the compressor. “Check of open phase”. “Check of compressor”.
D Check of compressor winding ●Disconnect the connector between the compressor and the power module (IC700) and measure the resistance between the compressor terminals. <> At 3 points BLK-WHT Measure the resistance between the lead wires at 3 points. BLK-RED WHT-RED <> Refer to 10-4. 0 [Ω] ················Abnormal [short] Infinite [Ω] ·······Abnormal [open] NOTE: Be sure to zero the ohmmeter before measurement.
G Check of outdoor thermistors Disconnect the connector of thermistor in the inverter P.C. board (see below table), and measure the resistance of thermistor. Is the resistance of thermistor normal? (Refer to 10-6.1.) Yes No Replace the thermistor except RT64. When RT64 is abnormal, replace the inverter P.C. board. Reconnect the connector of thermistor. Turn ON the power supply and press EMERGENCY OPERATION switch.
I Check of outdoor fan motor Check the connection between the connector CN931 and CN932. Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Is the resistance between each terminal of outdoor fan motor normal? (Refer to 10-4.) No Yes Disconnect CN932 from the inverter P.C. board, and turn on the power supply. Rotate the outdoor fan motor manually and measure the voltage of CN931.
J Check of power supply Disconnect the connector between the compressor and the power module (IC700). Turn ON power supply and press EMERGENCY OPERATION switch. Does the upper lamp of the OPERATION INDICATOR lamp on the indoor unit light up? Yes Is there bus-bar voltage 260 - 370 V DC between DB61 (+) and DB61 (–) on the inverter P.C. board? (Refer to 10-6.1.) No No Yes Rectify indoor/outdoor connecting wire.
K Check of LEV (Expansion valve) Turn ON the power supply. While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. Hold down the other 2 buttons for another 3 seconds. Make sure that the indicators on the LCD screen shown in the right figure are all displayed. Then release the buttons.
L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 10-5. .) Is the fuse (F901) blown on the inverter P.C. board? No Yes Check the connection of the connectors (CN931, CN932) of the outdoor fan motor. If the connection is poor, make it correct. Operate the outdoor unit by starting EMERGENCY OPERATION. Check the LED indication on the inverter P.C. board. Does the LED blink 10 times? Yes (10-time blink) No Check the corresponding parts following LED indication. (Refer to 10-3.
M How to check miswiring and serial signal error MUZ-JP09/12WA Turn OFF the power supply. Is there rated voltage in the power supply? Yes Check the power supply. No Turn ON the power supply. Yes No Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring. Press EMERGENCY OPERATION switch once.
N Check of outdoor refrigerant circuit Has the operation stopped during pump down? Yes The operation has stopped to prevent the diesel explosion caused by air trapped in the refrigerant circuit. Close the stop valve, and disconnect the power plug or turn the breaker OFF. No Was the operation started with the stop valve closed, and was it opened during operation? No The refrigerant gas amount may be 60% or less than the normal amount. Identify where the gas is leaking from, and fix the leak.
O Electromagnetic noise enters into TV sets or radios Is the unit grounded? Yes Is the distance between the antennas and the indoor unit within 9.91 ft. (3m), or is the distance between the antennas and the outdoor unit within 9.91 ft. (3m)? No Is the distance between the TV sets or radios and the indoor unit within 3.28 ft. (1m), or is the distance between the TV sets or radios and the outdoor unit within 9.91 ft. (3m)? Ground the unit.
10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board Smoothing capacitor (C61) MUZ-JP09WA MUZ-JP12WA Back side of unit DB61 260 - 370 V DC (-) (+) R.V.coil (CN721) 115 V AC Smoothing capacitor (C62) Fuse (F801) T3.15AL250V 115 V AC Fuse (F701) T3.15AL250V Output to drive compressor (LDU, LDV, LDW) LED Fuse (F901) T3.
11 DISASSEMBLY INSTRUCTIONS The terminal which has the locking mechanism can be detached as shown below. There are 2 types of terminals with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. (1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector shown below has the locking mechanism.
OPERATING PROCEDURE PHOTOS/FIGURES Photo 4 Photo 5 Screws of the conduit cover 2. Removing the inverter assembly, inverter P.C. board (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: CN721 (R.V.
OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors:
PHOTOS/FIGURES OPERATING PROCEDURE 5. Removing outdoor fan motor Photo 11 (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connectors: CN931, CN932 (Fan motor) (3) Remove the propeller fan nut. (4) Remove the propeller fan. (5) Remove the screws fixing the fan motor. (6) Remove the fan motor. NOTE: The propeller fan nut is a reverse thread. Screws of the outdoor fan motor Propeller fan 6.
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HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Issued: Jan. 2019. No. OBH821 REVISED EDITION-A Published: Nov. 2018. No. OBH821 Made in Japan Specifications are subject to change without notice.
