Download
Share
Print this page
Mitsubishi Electric MLZ-KP25VF-E1 Service Manual
  1. Manuals
  2. Brands
  3. Mitsubishi Electric Manuals
  4. Air Conditioner
  5. MLZ-KP25VF-E1
  6. Service manual

Mitsubishi Electric MLZ-KP25VF-E1 Service Manual

Indoor unit
Hide thumbs Also See for MLZ-KP25VF-E1:

Advertisement

Quick Links

Download this manual
INDOOR UNIT
SERVICE MANUAL
Models
MLZ-KP25VF
MLZ-KP35VF
MLZ-KP50VF
MLZ-KP25VG
MLZ-KP35VG
MLZ-KP50VG
-
E1
ER1
,
-
E1
ER1
,
-
E1
ER1
,
-
E1
ET1
,
-
E1
ET1
,
-
E1
ET1
,
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. SAFETY PRECAUTION ···································· 3
3. PART NAMES AND FUNCTIONS ···················· 7
4. SPECIFICATION ··············································· 8
5. NOISE CRITERIA CURVES ···························· 10
6. OUTLINES AND DIMENSIONS ·······················11
7. WIRING DIAGRAM ·········································· 13
8. REFRIGERANT SYSTEM DIAGRAM ············· 16
9. SERVICE FUNCTIONS ··································· 17
10. MICROPROCESSOR CONTROL ···················· 20
MLZ-KP25VF
11. TROUBLESHOOTING ····································· 29
MLZ-KP35VF
12. DISASSEMBLY INSTRUCTIONS ··················· 44
MLZ-KP50VF
MLZ-KP25VG
PARTS CATALOG (OBB801)
MLZ-KP35VG
MLZ-KP50VG
Revision A:
• MLZ-KP25/35/50VG-
been added.
OBH801 is void.
No. OBH801
REVISED EDITION-A
Outdoor unit service manual
MXZ-D VA Series (OBH626)
MXZ-E VA Series (OBH723)
MXZ-F VF Series (OBH790)
,
have
E1
ET1

Advertisement

loading
Need help?

Need help?

Do you have a question about the MLZ-KP25VF-E1 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Mitsubishi Electric MLZ-KP25VF-E1

Summary of Contents for Mitsubishi Electric MLZ-KP25VF-E1

  • Page 1 Revision A: • MLZ-KP25/35/50VG- have been added. OBH801 is void. INDOOR UNIT No. OBH801 SERVICE MANUAL REVISED EDITION-A Models MLZ-KP25VF MLZ-KP35VF MLZ-KP50VF MLZ-KP25VG MLZ-KP35VG MLZ-KP50VG Outdoor unit service manual MXZ-D VA Series (OBH626) MXZ-E VA Series (OBH723) MXZ-F VF Series (OBH790) CONTENTS 1.
  • Page 2 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 SAFETY PRECAUTION 2-1. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R32/R410A WARNING 1. Warning for service (1) In case of reconnecting the refrigerant pipes after detaching, make the flared part of pipe re-fabricated. (2) This unit should be installed in rooms which exceed the floor space specified in outdoor unit installation manual. Refer to outdoor unit installation manual.
  • Page 4 (1-8) Checks on the Refrigeration Equipment Where electrical components are being changed, they shall be fit for the purpose and to the correct specification. At all times the manufacturer’s maintenance and service guidelines shall be followed. If in doubt, consult the manufacturer’s technical department for assistance.
  • Page 5 (7) Removal and Evacuation When breaking into the refrigerant circuit to make repairs – or for any other purpose conventional procedures shall be used. However, for flammable refrigerants it is important that best practice is followed since flammability is a considera- tion.
  • Page 6 (10) Labelling Equipment shall be labelled stating that it has been de-commissioned and emptied of refrigerant. The label shall be dated and signed. For appliances containing flammable refrigerants, ensure that there are labels on the equipment stat- ing the equipment contains flammable refrigerant. (11) Recovery When removing refrigerant from a system, either for servicing or decommissioning, it is recommended good practice that all refrigerants are removed safely.
  • Page 7 PART NAMES AND FUNCTIONS INDOOR UNIT MLZ-KP25VF MLZ-KP35VF MLZ-KP50VF MLZ-KP25VG MLZ-KP35VG MLZ-KP50VG Horizontal vane Vertical vane Air inlet Intake grille Air outlet Air filter (Air purifying filter) Air cleaning filter (Silver-ionized air purifier filter, option) [MLZ-KP**VF] (V Blocking filter, option) [MLZ-KP**VG] Display section Spec name plate Safety strings...
  • Page 8 SPECIFICATION Indoor model MLZ-KP25VF MLZ-KP35VF Function Cooling Heating Cooling Heating Single phase Single phase Power supply 230V, 50Hz 230V, 50Hz Capacity Air flow (High/Med./Low/SLow) m 528/480/432/360 552/492/420/360 564/504/438/360 594/528/462/360 Running current Power input Auxiliary heater A(kW) Power factor Fan motor current Model RC0J30-CZ RC0J30-CZ...
  • Page 9 Indoor model Indoor model MLZ-KP25VG MLZ-KP25VG MLZ-KP35VG MLZ-KP35VG Function Function Cooling Cooling Heating Heating Cooling Cooling Heating Heating Single phase Single phase Single phase Single phase Power supply Power supply 230V, 50Hz 230V, 50Hz 230V, 50Hz 230V, 50Hz Capacity Air flow (High/Med./Low/SLow) m Capacity Air flow (High/Med./Low/SLow) m 528/480/432/360 528/480/432/360...
  • Page 10 NOISE CRITERIA CURVES MLZ-KP25VF MLZ-KP35VF MLZ-KP25VG MLZ-KP35VG FAN SPEED FUNCTION SPL(dB(A)) LINE FAN SPEED FUNCTION SPL(dB(A)) LINE COOLING COOLING High High HEATING HEATING Test conditions, Test conditions, Cooling: Dry-bulb temperature 27ºC Wet-bulb temperature 19ºC Cooling: Dry-bulb temperature 27ºC Wet-bulb temperature 19ºC Heating: Dry-bulb temperature 20ºC Heating: Dry-bulb temperature 20ºC NC-70...
  • Page 11 OUTLINES AND DIMENSIONS Unit: mm INDOOR UNIT MLZ-KP25VF MLZ-KP35VF MLZ-KP50VF OBH801A...
  • Page 12 MLZ-KP25VG MLZ-KP35VG MLZ-KP50VG OBH801A...
  • Page 13 WIRING DIAGRAM INDOOR UNIT MLZ-KP25VF- MLZ-KP35VF- MLZ-KP50VF- OBH801A...
  • Page 14 MLZ-KP25VG- MLZ-KP35VG- CN302 CN301 DISP P.C.BOARD P.C.BOARD NOTES : SYMBOL NAME SYMBOL NAME About the outdoor side TERMINAL electric wiring refer to the FAN MOTOR BLOCK CN106 outdoor unit electric wiring diagram for servicing. HORIZONTAL ROOM TEMP. RT11 VANE MOTOR THERMISTOR Use copper conductors CN125...
  • Page 15 MLZ-KP25VG- MLZ-KP35VG- MLZ-KP50VG- OBH801A...
  • Page 16 REFRIGERANT SYSTEM DIAGRAM INDOOR UNIT MLZ-KP25VF MLZ-KP50VF Unit: mm MLZ-KP35VF MLZ-KP50VG MLZ-KP25VG Refrigerant pipe Ø9.52 Refrigerant pipe Ø12.7 MLZ-KP35VG (with heat insulator) (with heat insulator) Indoor coil Indoor coil thermistor Indoor thermistor Indoor RT12,RT14, heat heat RT12 (main) RT15 (main) exchanger Flared connection exchanger...
  • Page 17 SERVICE FUNCTIONS MLZ-KP25VF MLZ-KP35VF MLZ-KP50VF MLZ-KP25VG MLZ-KP35VG MLZ-KP50VG 9-1. 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 11-7.) • The set time for the ON/OFF timer can be reduced to 1 second for each minute. •...
  • Page 18 9-3. 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 19 9-4. P.C. BOARD MODIFICATION FOR CHANGING AIRFLOW VOLUME Change DIP switch SW3 setting according to the height of ceiling. DIP switch SW3 Normal Increase airflow volume Ceiling height 2.4 m or below above 2.4 m and 2.7 m or below NOTE: When the ceiling is above 2.7 m, airflow volume may be insufficient even with the DIP switch (SW3) set to "increase airflow".
  • Page 20 MICROPROCESSOR CONTROL MLZ-KP25VF MLZ-KP35VF MLZ-KP50VF WIRELESS REMOTE CONTROLLER Signal transmitting section Operate the remote control- ler in the area where signal is Distance of signal: About 6 m received, and beep is heard. Beep(s) is (are) heard from the indoor unit when the signal is received.
  • Page 21 MLZ-KP25VG MLZ-KP35VG MLZ-KP50VG WIRELESS REMOTE CONTROLLER Signal transmitting section Operate the remote control- ler in the area where signal is Distance of signal: About 6 m received, and beep is heard. Beep(s) is (are) heard from the indoor unit when the signal is received.
  • Page 22 10-1. 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. (3) Press TEMPERATURE buttons TEMP button to select the desired temperature. The setting range is 16 - 31°C. 1.
  • Page 23 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 24 (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 2°C higher by micro- processor.
  • Page 25 10-8. 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 26 10-9. 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. NOTE: The simple ON/OFF timer setting is available while the weekly timer is on. In this case, the ON/OFF timer has priority over the •...
  • Page 27 (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 28 10-11. 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 29 TROUBLESHOOTING MLZ-KP25VF MLZ-KP35VF MLZ-KP50VF MLZ-KP25VG MLZ-KP35VG MLZ-KP50VG 11-1. 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 30 11-2. 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 (11-4.) disappears, the memorized failure details can be recalled. 1.
  • Page 31 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 32 3. Indoor unit failure mode table NOTE: Blinking patterns of this mode differs from the ones of Troubleshooting check table (11-4.). Left lamp of Right lamp of Abnormal point OPERATION OPERATION Condition Remedy (Failure mode) INDICATOR lamp INDICATOR lamp Not lit Not lit Normal —...
  • Page 33 11-3. 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 34 11-4. 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 35 OPERATION INDICATOR · Blinking of OPERATION INDICATOR lamp (right-hand side lamp) indicates abnormality. Blinking · OPERATION INDICATOR lamp (left-hand side lamp) is lit. Not lit Abnormal Operation indicator lamp Symptom Condition Remedy point Right lamp blinks When the operation mode of the each indoor Outdoor unit MXZ type •...
  • Page 36 11-6. TROUBLESHOOTING FLOW When the left lamp of OPERATION INDICATOR lamp blinks 3 times and the right lamp of OPERATION INDICATOR lamp is not lit. 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 37 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 38 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 39 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 230 V AC in the power supply.
  • Page 40 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 41 Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 3 m, or is the the indoor unit, and/or the antennas and the distance between the antennas and the outdoor unit.
  • Page 42 11-7. TEST POINT DIAGRAM AND VOLTAGE Factory setting MLZ-KP25VF MLZ-KP35VF MLZ-KP50VF (Do not change the setting.) SW101 Indoor electronic control P.C. board NR11 CN1N1 CN145 CN202 Varistor Drain pump Float sensor Serial signal R111 F11 FUSE T3.15AL250V CN201 Power supply input 230 V AC CN1M1 Display P.C.
  • Page 43 MLZ-KP25VG MLZ-KP35VG MLZ-KP50VG Factory setting Indoor electronic control P.C. board (Do not change the setting.) SW101 NR11 CN1N1 CN145 CN202 Varistor Drain pump Float sensor Serial signal R111 F11 FUSE T3.15AL250V CN201 Power supply input 230 V AC CN1M1 Display P.C. board connector CN111 Room temperature...
  • Page 44 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 45 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 the left and right sides (Figure 5). Attach to the 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 46 OPERATING PROCEDURE PHOTOS/FIGURES (7) Install the screw cap. Figure 9 (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 47 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. Fixing screw of Drain pan board the electrical box (1) Remove the intake grille. (2) Remove the side panel (L). (3) Remove the electrical covers (4 fixing screws) (Photo 2).
  • Page 48 Safety string Fan motor HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Issued: Dec. 2023. No. OBH801 REVISED EDITION-A Published in Feb. 2018 No. OBH801 Specifications are subject to change without notice.

This manual is also suitable for:

Mlz-kp25vf-er1Mlz-kp35vf-e1Mlz-kp35vf-er1Mlz-kp50vf-e1Mlz-kp50vf-er1Mlz-kp25vg-e1 ... Show all