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Mitsubishi Electric MLZ-KP09NA Service Manual

Split-type air conditioners
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INDOOR UNIT
SERVICE MANUAL
Models
MLZ-KP12NA
-
U1
-
U1
-
U1
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ···················· 3
3. SPECIFICATION ··············································· 4
MLZ-KP09NA
4. OUTLINES AND DIMENSIONS ························ 6
MLZ-KP12NA
5. WIRING DIAGRAM ············································ 7
MLZ-KP18NA
6. REFRIGERANT SYSTEM DIAGRAM ··············· 8
7. SERVICE FUNCTIONS ····································· 9
8. MICROPROCESSOR CONTROL ··················· 12
9. TROUBLESHOOTING ····································· 21
10. DISASSEMBLY INSTRUCTIONS ··················· 35
PARTS CATALOG (OBB802)
sandium.com
Revision A:
• 5. WIRING DIAGRAM has been modified.
OBH802 is void.
No. OBH802
REVISED EDITION-A
Outdoor unit service manual
MXZ-C NA, MXZ-C NAHZ Series
(OBH702, OCH573)
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Summary of Contents for Mitsubishi Electric MLZ-KP09NA

  • Page 1 Revision A: • 5. WIRING DIAGRAM has been modified. OBH802 is void. INDOOR UNIT No. OBH802 SERVICE MANUAL REVISED EDITION-A Models MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA Outdoor unit service manual MXZ-C NA, MXZ-C NAHZ Series (OBH702, OCH573) CONTENTS 1. TECHNICAL CHANGES ··································· 2 2.
  • Page 2 When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to touch the live parts. Revision A: • 5. WIRING DIAGRAM has been modified. TECHNICAL CHANGES MLZ-KP09NA- MLZ-KP12NA- MLZ-KP18NA- 1. New model OBH802A...
  • Page 3 PART NAMES AND FUNCTIONS INDOOR UNIT MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA Horizontal vane Vertical vane Air inlet Intake grille Air outlet Air filter (Air purifying filter) Air cleaning filter (Anti-Allergy Enzyme filter, option) Display section Spec name plate Safety strings Open the display cover...
  • Page 4 External finish White Control voltage (by built-in transformer) 12 - 24 V DC NOTE: Test conditions are based on ARI 210/240. Specifications and rated conditions of main electric parts Model MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA Item Fuse (F11) T3.15AL250V Horizontal vane motor (MV1)
  • Page 5 (CFM) (ft./s.) when air is blown out horizontally from HEAT 13.0 20.7 the unit properly at the High speed posi- 13.6 MLZ-KP09NA 21.7 tion. COOL — — — The coverage should be used only as a general guideline since it varies accord- HEAT 13.9...
  • Page 6 OUTLINES AND DIMENSIONS MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA Unit: inch INDOOR UNIT OBH802A sandium.com...
  • Page 7 WIRING DIAGRAM INDOOR UNIT MLZ-KP09NA- MLZ-KP12NA- CN302 CN301 DISP P.C.BOARD P.C.BOARD NOTES : NAME NAME SYMBOL SYMBOL 1.About the outdoor side electric wiring ROOM TEMP. refer to the outdoor unit electric wiring FAN MOTOR RT11 THERMISTOR diagram for servicing. COIL TEMP.
  • Page 8 REFRIGERANT SYSTEM DIAGRAM INDOOR UNIT MLZ-KP09NA MLZ-KP18NA Unit: inch(mm) MLZ-KP12NA Refrigerant pipe Ø3/8(Ø9.52) Refrigerant pipe Ø1/2(Ø12.7) (with heat insulator) (with heat insulator) Indoor coil Indoor coil thermistor thermistor Indoor Indoor RT12,RT14, heat heat RT12 (main) RT15 (main) exchanger Flared connection...
  • Page 9 SERVICE FUNCTIONS MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA 7-1. TIMER SHORT MODE • For service, the following set time can be shortened by bridging the timer short mode point on the electronic control P.C. board. (Refer to 9-7.) • The set time for the ON/OFF timer can be reduced to 1 second for each minute.
  • Page 10 7-3. AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed are memorized by the indoor electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation in the same mode just before the shutoff of the main power. Operation If the main power has been cut, the operation settings remain.
  • Page 11 7-4. P.C. BOARD MODIFICATION FOR CHANGING AIRFLOW VOLUME Change Slide switch SW3 setting according to the height of ceiling. Slide switch SW3 Normal Increase airflow volume Ceiling height 8.0 ft. (2.4 m) or below above 8.0 ft. (2.4 m) and 9.0 ft. (2.7 m) or below NOTE: When the ceiling is above 9.0 ft.
  • Page 12 MICROPROCESSOR CONTROL MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA WIRELESS REMOTE CONTROLLER Signal transmitting section Operate the remote control- Distance of signal: About 20 ft. (6 m) ler in the area where signal is Beep(s) is (are) heard from received, and beep is heard.
  • Page 13 8-1. COOL ( ) OPERATION (1) Press STOP/OPERATE(OFF/ON) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. button to select the desired temperature. The setting range is 61 - 88°F (16 (3) Press TEMPERATURE buttons TEMP - 31°C).
  • Page 14 NOTE 2 FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT: MXZ series Multi system air conditioner can connect 2 or more indoor units with one outdoor unit. • When you try to operate 2 or more indoor units with one outdoor unit simultaneously, one for the cooling and the others for heating, the operation mode of the indoor unit that operates first is selected.
  • Page 15 (6) SWING ( ) mode By selecting SWING mode with VANE CONTROL button, the horizontal vanes swing vertically. When COOL, DRY or FAN mode is selected, only the upper vane swings. (7) Cold air prevention in HEAT operation The horizontal vane position is set to Upward. (8) ECONO COOL ( ) operation (ECONOmical operation) When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 4°F(2°C) higher by microprocessor.
  • Page 16 8-8. TIMER OPERATION 1. How to set the time (1) Check that the current time is set correctly. NOTE: Timer operation will not work without setting the current time. Initially “0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK SET button. How to set the current time (a) Press the CLOCK set button.
  • Page 17 8-9. WEEKLY TIMER OPERATION • A maximum of 4 ON or OFF timers can be set for individual days of the week. • A maximum of 28 ON or OFF timers can be set for a week. E.g. : Runs at 75°F (24°C) from waking up to leaving home, and runs at 81°F (27°C) from getting home to going to bed on weekdays.
  • Page 18 (4) Press button to complete and transmit the weekly timer setting. which was blink- ing goes out, and the current time will be displayed. NOTE: • Press button to transmit the setting information of weekly timer to the indoor unit. Point the remote controller toward the indoor unit for 3 seconds.
  • Page 19 8-11. SLEEP ( ) OPERATION 1. How to set SLEEP operation (1) Press STOP/OPERATE (OFF/ON) button. (2) Select COOL, DRY, HEAT or FAN mode. (3) Press SLEEP ( ) button. (4) PRESS TEMPERATURE buttons [ (Increase) and (Decrease) ] to set the temperature of SLEEP operation.
  • Page 20 8-12. EMERGENCY/TEST OPERATION In the case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the right side of the indoor unit. Emergency operation is available when the remote controller is missing or has failed, or the batteries in the remote controller are running down.
  • Page 21 TROUBLESHOOTING MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA 9-1. 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 unit first with the remote controller, and then after confirming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
  • Page 22 9-2. 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 (9-4.) disappears, the memorized failure details can be recalled. 1.
  • Page 23 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.
  • Page 24 3. Indoor unit failure mode table NOTE: Blinking patterns of this mode differs from the ones of Troubleshooting check table (9-4.). Left lamp of Right lamp of Abnormal point OPERATION OPERATION Condition Remedy (Failure mode) INDICATOR lamp INDICATOR lamp Not lit Not lit Normal —...
  • Page 25 9-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit Indoor unit Indoor unit operates. OPERATION INDICATOR operates. does not receive Outdoor unit does not lamp on the indoor unit is Outdoor unit the signal from operate normally. blinking on and off. does not remote controller.
  • Page 26 9-4. TROUBLESHOOTING CHECK TABLE OPERATION INDICATOR · Blinking of OPERATION INDICATOR lamp (left-hand side lamp) indicates abnormalities. Blinking Not lit NOTE: Before taking measures, make sure that the symptom reappears for accurate troubleshooting. Self check table Abnormal Operation indicator lamp Symptom Condition Remedy...
  • Page 27 NOTE: When the indoor unit has started operation and the above failures are detected (the first detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR lamp blinking. 9-5. TROUBLE JUDGEMENT CRITERIA OF MAIN PARTS MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA Part name Check method and criteria...
  • Page 28 9-6. TROUBLESHOOTING FLOW When the left lamp of OPERATION INDICATOR lamp blinks 3 times and the right lamp of OPERATION INDICATOR lamp is not lighted. Indoor fan does not operate. Check of indoor fan motor The indoor fan motor error has occurred, and the indoor fan does not operate. Turn OFF the power supply.
  • Page 29 Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller. Check of remote controller,receiver P.C. board and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner. Press STOP/OPERATE (OFF/ON) button on the remote controller.
  • Page 30 The unit cannot be operated with the remote controller. Also, OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch. Check of indoor electronic control P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 and vane Turn OFF the power supply.
  • Page 31 When the left lamp of OPERATION INDICATOR lamp blinks ON and OFF in every 0.5-second. Outdoor unit does not operate. How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage of Check the power 208/230 V AC in the power supply.
  • Page 32 When the left lamp of OPERATION INDICATOR lamp blinks 9-time. Indoor unit and outdoor unit do not operate. Check of float sensor Turn OFF the power supply and check connectors CN145 and CN1N1 visually. Are there abnormality in Are the lead wires Replace the indoor Connect the lead wire.
  • Page 33 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 34 9-7. TEST POINT DIAGRAM AND VOLTAGE Factory setting MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA (Do not change the setting.) NR11 SW101 Indoor electronic control P.C. board Varistor CN1N1 CN145 CN202 Drain pump Float sensor Serial signal R111 F11 FUSE T3.15AL250V CN201 Power supply...
  • Page 35 Locking lever lever. Connector MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA : Indicates the visible parts in the photos/figures. NOTE: Turn OFF the power supply before disassembly. : Indicates the invisible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES Photo 1 1.
  • Page 36 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the grille Figure 5 (1) Remove the intake grille. (2) Remove the fixing screws for side panels (2 screws) on Attach to the the left and right sides (Figure 5). hook of grille. (3) Open the side panels on the left and right sides. Screw cap Remove the safety strings from the grille and remove the side panels (Figure 5).
  • Page 37 OPERATING PROCEDURE PHOTOS/FIGURES Figure 9 (7) Install the screw cap. (8) After attaching the safety strings for the left and right side panels to the grille, install the side panels (Figure NOTE: Make sure that the tabs of the side panels securely fit into place (Figure 9).
  • Page 38 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the indoor electric control P.C. board, Photo 2 the receiver P.C. board and the display P.C. Drain pan Fixing screw of the electrical box board (1) Remove the intake grille. (2) Remove the side panel (L). (3) Remove the electrical cover (4 fixing screws) (Photo 2).
  • Page 39 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the drain pump and float sensor Photo 5 Connector of Connector of the Fixing screw of the (1) Remove the grille. the drain pump float sensor drain pump cover (2) Remove the drain pan. (3) Disconnect the connector of the drain pump (Photo 5). (4) Disconnect the connector of the float sensor (Photo 5).
  • Page 40 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Issued: Mar. 2019. No. OBH802 REVISED EDITION-A Published: Mar. 2018. No. OBH802 Made in Japan Specifications are subject to change without notice. sandium.com...

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