Table of Contents
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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-FS06NA
MUZ-FS09NA
MUZ-FS12NA
MUZ-FS15NA
MUZ-FS18NA
MUZ-FS06NA
MUZ-FS09NA
MUZ-FS12NA
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U1
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U1
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U1
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U1
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U1
MUZ-FS06NAH
MUZ-FS09NAH
MUZ-FS12NAH
Revision A:
• A warning when opening or closing the
valve has been added.
OBH873 is void.
HFC
utilized
R410A
MUZ-FS06NAH
MUZ-FS09NAH
MUZ-FS12NAH
MUZ-FS15NAH
MUZ-FS18NAH
Indoor unit service manual
MSZ-FS•NA Series (OBH872)
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. OUTLINES AND DIMENSIONS ·····················6
5. WIRING DIAGRAM ·····································8
6. REFRIGERANT SYSTEM DIAGRAM ··········· 10
7. DATA······················································ 12
8. ACTUATOR CONTROL ····························· 23
9. SERVICE FUNCTIONS ······························ 24
10. TROUBLESHOOTING ······························· 25
11. DISASSEMBLY INSTRUCTIONS ················· 46
PARTS CATALOG (OBB873)
No. OBH873
REVISED EDITION-A
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U1
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U1
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U1
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U1
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U1
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Table of Contents
Related Manuals for Mitsubishi Electric MUZ-FS06NAH-U1
Summary of Contents for Mitsubishi Electric MUZ-FS06NAH-U1
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Page 1: Table Of Contents
Revision A: • A warning when opening or closing the valve has been added. OBH873 is void. OUTDOOR UNIT No. OBH873 utilized REVISED EDITION-A SERVICE MANUAL R410A Models MUZ-FS06NA MUZ-FS06NAH MUZ-FS09NA MUZ-FS09NAH MUZ-FS12NA MUZ-FS12NAH MUZ-FS15NA MUZ-FS15NAH MUZ-FS18NA MUZ-FS18NAH Indoor unit service manual MSZ-FS•NA Series (OBH872) CONTENTS 1. -
Page 2: Technical Changes
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. -
Page 3: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-FS06NA MUZ-FS06NAH MUZ-FS09NA MUZ-FS09NAH MUZ-FS12NA MUZ-FS12NAH Air inlet (back and side) Piping Air outlet Drain hose Drain outlet MUZ-FS15NA MUZ-FS15NAH MUZ-FS18NA MUZ-FS18NAH Air inlet (back and side) Piping Air outlet Drain hose Drain outlet OBH873A... -
Page 4: Specification
SPECIFICATION MUZ-FS06NA MUZ-FS09NA MUZ-FS12NA MUZ-FS15NA MUZ-FS18NA Outdoor unit model MUZ-FS06NAH MUZ-FS09NAH MUZ-FS12NAH MUZ-FS15NAH MUZ-FS18NAH 6,000 9,000 12,000 14,000 17,200 Btu/h Cooling *1 (1,700 ~ 9,000) (1,700 ~ 12,000) (2,500 ~ 13,600) (6,450 ~ 19,000) (6,450 ~ 21,000) Capacity 8,700 9,600 12,300 16,000 19,000... - Page 5 Test condition *3, *4 Indoor air condition (°F) Outdoor air condition (°F) Mode Test AHRI Dry bulb Wet bulb Dry bulb Wet bulb 210/240 "A-Full" Cooling Steady State (75) at rated compressor speed "B-Full" Cooling Steady State (65) at rated compressor speed SEER "B-Low"...
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Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-FS06NA MUZ-FS06NAH MUZ-FS09NA MUZ-FS09NAH MUZ-FS12NA MUZ-FS12NAH Unit: inch REQUIRED SPACE 4 in. (100 mm) or more when front and sides of the unit are clear (MUZ-FS06/09/12NA) (MUZ-FS06/09/12NAH) When any 2 sides of left, right and rear of the unit are clear 2 x hole 3/8 x 13/16 Liquid refrigerant pipe joint Refrigerant pipe (flared) - Page 7 MUZ-FS15NA MUZ-FS15NAH MUZ-FS18NA MUZ-FS18NAH Unit: inch REQUIRED SPACE 4 in OR MORE. 14 in OR MORE. 16-7/16 AIR IN ↓ DRAIN HOLE ø1-21/32 → 20 in OR MORE. AIR IN OPEN TWO SIDES OF RIGHT 4 in OR MORE. OR REAR SIDE. ↓...
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Page 8: Wiring Diagram
WIRING DIAGRAM MUZ-FS06NA MUZ-FS09NA MUZ-FS12NA MUZ-FS06NAH MUZ-FS09NAH MUZ-FS12NAH OBH873A... - Page 9 MUZ-FS15NA MUZ-FS18NA MUZ-FS15NAH MUZ-FS18NAH OBH873A...
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Page 10: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-FS06NA MUZ-FS06NAH MUZ-FS09NA MUZ-FS09NAH MUZ-FS12NA MUZ-FS12NAH Unit: inch Refrigerant pipe ø3/8 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature thermistor Outdoor Muffler Discharge RT68 heat Flared connection exchanger temperature Service port thermistor Service port (low pressure) RT62 (high pressure) - Page 11 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: ft. Piping size O.D: in. Model Max. Length Max. Height difference Liquid MUZ-FS06NA MUZ-FS06NAH MUZ-FS09NA MUZ-FS09NAH MUZ-FS12NA MUZ-FS12NAH MUZ-FS15NA MUZ-FS15NAH MUZ-FS18NA MUZ-FS18NAH Indoor unit Max. Height difference Max. Length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) NOTE: Refrigerant piping exceeding 25 ft.
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Page 12: Data
DATA MUZ-FS06NA MUZ-FS06NAH MUZ-FS09NA MUZ-FS09NAH MUZ-FS12NA MUZ-FS12NAH MUZ-FS15NA MUZ-FS15NAH MUZ-FS18NA MUZ-FS18NAH 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Outdoor intake air DB temperature (˚F) Model IWB (˚F) 0.83 0.28 0.83 0.31 0.83 0.33 MUZ-FS06NA 0.96 0.26 0.96 0.29 0.96 0.32 MUZ-FS06NAH 1.09... - Page 13 2) COOLING CAPACITY CORRECTIONS Refrigerant piping length (one way: ft.) 25 (std.) MUZ-FS06NA MUZ-FS06NAH MUZ-FS09NA 0.988 0.967 MUZ-FS09NAH MUZ-FS12NA MUZ-FS12NAH MUZ-FS15NA MUZ-FS15NAH 0.985 0.963 0.933 MUZ-FS18NA MUZ-FS18NAH 3) HEATING CAPACITY CORRECTIONS Refrigerant piping length (one way: ft.) 25 (std.) MUZ-FS06NA MUZ-FS06NAH MUZ-FS09NA 0.997...
- Page 14 4) HEATING CAPACITY Indoor air Outdoor intake air WB temperature (˚F) Model IDB (˚F) 0.32 0.41 0.48 0.53 0.56 0.57 0.59 MUZ-FS06NA 0.31 0.39 0.47 0.52 0.55 0.56 10.1 0.58 0.29 0.38 0.45 0.50 0.53 0.54 10.4 0.57 0.45 0.54 0.61 0.53 0.56...
- Page 15 7-2. PERFORMANCE CURVE Cooling Cooling capacity (at Rated frequency) Indoor intake air Wet-bulb temperature( F) Outdoor intake air DB temperature(°F) MUZ-FS06NA MUZ-FS06NAH MUZ-FS09NA MUZ-FS09NAH SHF at rating condition = 0.96 SHF at rating condition = 0.92 = 381 CFM = 381 CFM Airflow Airflow Outdoor intake air DB temperature (°F)
- Page 16 Heating Heating capacity (at Rated frequency) Outdoor intake air WB temperature (°F) MUZ-FS06NA MUZ-FS06NAH = 437 CFM = 437 CFM Airflow Airflow Outdoor intake air WB temperature (°F) Outdoor intake air WB temperature (°F) MUZ-FS09NA MUZ-FS09NAH Airflow = 437 CFM Airflow = 437 CFM Outdoor intake air WB temperature (°F)
- Page 17 MUZ-FS18NA MUZ-FS18NAH = 514 CFM = 514 CFM Airflow Airflow 2.00 1.75 1.50 1.25 1.00 0.75 0.50 Outdoor intake air WB temperature (°F) Outdoor intake air WB temperature (°F) This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships between frequency and capacity.
- Page 18 MUZ-FS15NA MUZ-FS15NAH (PSIG) (PSIG) (°F) (°F) 95 100 105 110 115 95 100 105 110 115 Outdoor ambient temperature Outdoor ambient temperature MUZ-FS18NA MUZ-FS18NAH (PSIG) (PSIG) (°F) (°F) 95 100 105 110 115 95 100 105 110 115 Outdoor ambient temperature Outdoor ambient temperature Heating Data are based on the condition of outdoor humidity 75%.
- Page 19 MUZ-FS15NA MUZ-FS15NAH (PSIG) (PSIG) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-FS18NA MUZ-FS18NAH (PSIG) (PSIG) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature OBH873A...
- Page 20 7-4. STANDARD OPERATION DATA Model MSZ-FS06NA MSZ-FS09NA MSZ-FS12NA MSZ-FS15NA MSZ-FS18NA Item Unit Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating Capacity Btu/h 6,000 8,700 9,000 9,600 12,000 12,300 14,000 16,000 17,200 19,000 — 0.96 — 0.92 — 0.83 —...
- Page 21 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-FS06NA MUZ-FS06NAH Correction of Cooling capacity Correction of Cooling total input Correction of Heating total input Correction of Heating capacity (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ-FS09NA MUZ-FS09NAH...
- Page 22 MUZ-FS18NA MUZ-FS18NAH Correction of Cooling capacity Correction of Cooling total input Correction of Heating total input Correction of Heating capacity (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor 7-6.
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Page 23: Actuator Control
ACTUATOR CONTROL MUZ-FS06NA MUZ-FS06NAH MUZ-FS09NA MUZ-FS09NAH MUZ-FS12NA MUZ-FS12NAH MUZ-FS15NA MUZ-FS15NAH MUZ-FS18NA MUZ-FS18NAH 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 Compressor... -
Page 24: Service Functions
SERVICE FUNCTIONS MUZ-FS06NA MUZ-FS06NAH MUZ-FS09NA MUZ-FS09NAH MUZ-FS12NA MUZ-FS12NAH MUZ-FS15NA MUZ-FS15NAH MUZ-FS18NA MUZ-FS18NAH 9-1. CHANGE IN DEFROST SETTING Changing defrost finish temperature <JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board (Refer to 10-6.1.). Defrost finish temperature Jumper MUZ-FS06/09/12NA... -
Page 25: Troubleshooting
TROUBLESHOOTING MUZ-FS06NA MUZ-FS06NAH MUZ-FS09NA MUZ-FS09NAH MUZ-FS12NA MUZ-FS12NAH MUZ-FS15NA MUZ-FS15NAH MUZ-FS18NA MUZ-FS18NAH 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 con- firming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug. - Page 26 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.
- Page 27 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. 1.
- Page 28 NOTE: Blinking patterns of this mode differ from the ones 3. Table of outdoor unit failure mode recall function of TROUBLESHOOTING CHECK TABLE (10-3.). The left lamp of the Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Remedy failure mode INDICATOR...
- Page 29 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). The left lamp of the Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Remedy failure mode INDICATOR (Failure mode/protection) (Outdoor P.C. board) mode recall recall function lamp...
- Page 30 10-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink every Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of compres- does not op- 2.5 seconds within 1 minute after the compressor gets started. sor.
- Page 31 Abnormal point/ Symptom LED indication Condition Remedy Condition FS06/09/12 When the input current exceeds approximately Outdoor unit 1-time blink Frequency drop by The unit is normal, but check the operates. 2.5 seconds OFF current protection 10A (FS06/09)/10.5A (FS12), compressor fre- following.
- Page 32 10-4. TROUBLESHOOTING CRITERION OF MAIN PARTS MUZ-FS06NA MUZ-FS06NAH MUZ-FS09NA MUZ-FS09NAH MUZ-FS12NA MUZ-FS12NAH MUZ-FS15NA MUZ-FS15NAH MUZ-FS18NA MUZ-FS18NAH Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a tester. Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C. Fin temperature board”, for the chart of thermistor.
- Page 33 10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IC700). Check the voltage between terminals. See 10-5. “Check of open phase”. Replace the inverter P.C. board. Are the voltages balanced? Check the compressor. See 10-5.
- Page 34 D Check of compressor winding ●Disconnect the connector between the compressor and the power module (IC700), and measure the resistance between the compressor terminals. <<Measurement point>> At 3 points BLK-WHT *Measure the resistance between the lead wires at 3 points. BLK-RED WHT-RED <<Judgement>>...
- Page 35 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. Replace the thermistor except RT64. Is the resistance of thermistor normal? When RT64 is abnormal, replace the inverter P.C. (Refer to 10-6.1.) board.
- Page 36 H Check of R.V. coil MUZ-FS06/09/12 * First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4. * In case CN721 is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector although no signal is being transmitted to R.V.
- Page 37 I Check of outdoor fan motor Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Check the connection between the connector CN931 and CN932. Is the resistance between each ter- minal of outdoor fan motor normal? (Refer to 10-4.) Disconnect CN932 from the inverter P.C.
- Page 38 J Check of power supply Disconnect the connector between the compressor and the power module (IC700). Rectify indoor/outdoor Turn ON power supply and press EMERGENCY OPERATION switch. connecting wire. Does the left lamp of the Is there voltage 208/230 V DC Replace the indoor OPERATION INDICATOR lamp on between the indoor terminal...
- Page 39 K Check of LEV (Expansion valve) Turn ON the power supply. <Preparation of the remote controller> While pressing both Operation select button and TEMP 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.
- Page 40 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 10-5. .) Is the fuse (F901) blown on the in- verter P.C. board? 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.
- Page 41 M How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Check the wiring. Is there rated voltage between the outdoor terminal block S1 and S2? Press EMERGENCY OPERATION switch once.
- Page 42 N Check of defrost heater MUZ-FS06NAH MUZ-FS09NAH MUZ-FS12NAH MUZ-FS15NAH MUZ-FS18NAH Check the following points before checking electric continuity. 1. Does the resistance of ambient temperature thermistor have the characteristics? Refer to 10-6.1. 2. Is the resistance of defrost heater normal? Refer to 10-4. 3.
- Page 43 P Electromagnetic noise enters into TV sets or radios Is the unit grounded? Ground the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 9.91 ft. (3m), the indoor unit, and/or the antennas and the or is the distance between the antennas outdoor unit.
- Page 44 10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-FS06NA MUZ-FS06NAH MUZ-FS09NA MUZ-FS09NAH MUZ-FS12NA MUZ-FS12NAH Smoothing Smoothing DB61 Back side of unit R.V.coil (CN721) capacitor (C62) capacitor (C61) 260 - 370 V DC 208/230 V AC Fuse (F801) Fuse (F701) 208/230 V AC T3.15AL250V T3.15AL250V...
- Page 45 MUZ-FS15NA MUZ-FS15NAH MUZ-FS18NA MUZ-FS18NAH Back side of unit Smoothing Smoothing Smoothing Fuse (F880) Output to drive Heater (CN601) Capacitor Capacitor Capacitor T3.15AL250V outdoor fan motor 208/230 V AC (CB3) (CB1) (CB2) (CN932) [MUZ-FS15/18NAH] 208/230 V AC R.V. coil/ 21S4 (CN602) 208/230 V AC Fuse (F62) 15 A 250 V...
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Page 46: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <Detaching method of the terminal with locking mechanism> The terminal which has the locking mechanism can be detached as shown below. There are 2 types of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. - Page 47 OPERATING PROCEDURE PHOTOS/FIGURES Photo 4 Photo 5 Screws of the Screw of the conduit cover conduit plate 2. Removing the inverter assembly, inverter P.C. board Photo 6 (1) Remove the cabinet and panels. (Refer to section 1.) Screw of the heat sink (2) Disconnect the lead wire to the reactor and the following support and the separator connectors:...
- Page 48 OPERATING PROCEDURE PHOTOS/FIGURES Screw of the 4. Removing the discharge temperature thermistor, Photo 8 R.V. coil defrost thermistor, outdoor heat exchanger tempera- ture 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 con- nectors: <Inverter P.C.
- Page 49 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing outdoor fan motor Photo 11 Screws of the outdoor fan motor (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931, CN932 (Fan motor) (3) Remove the propeller fan nut. (4) Remove the propeller fan.
- Page 50 11-2. MUZ-FS15NA MUZ-FS15NAH MUZ-FS18NA MUZ-FS18NAH NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 Screws of the top panel (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
- Page 51 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Photo 5 board Screw of the P.C. board (1) Remove the cabinet and panels. (Refer to section 1.) Screw of the heat sink support and the motor (2) Disconnect the lead wire to the reactor and the following support and the separator support connectors:...
- Page 52 OPERATING PROCEDURE PHOTOS/FIGURES Photo 7 Connection procedure when attaching the inverter P.C. board (Photo 8, 9) 1. Attach the heat sink support to the P.C. board support. 2. Hook the lead wires of the compressor, the reactor and the P.C. board to each hooks on the heat sink support as shown Photo 8.
- Page 53 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the discharge temperature thermistor, Photo 10 Outdoor heat exchanger defrost thermistor, outdoor heat exchanger tempera- temperature thermistor ture 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: <Inverter P.C.
- Page 54 Brazed parts of 4-way valve HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2020 MITSUBISHI ELECTRIC CORPORATION Issued: Jun. 2021. No. OBH873 REVISED EDITION-A Published: Nov. 2020. No. OBH873 Specifications are subject to change without notice.