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SPLIT-TYPE AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
Models
MSZ-SF15VA -
MSZ-SF20VA -
MSZ-SF20VA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Revision A:
• MSZ-SF15VA-
been added.
Please void OBH555.
E1
,
E2
,
E1
E2
Outdoor unit service manual
MXZ-B·VA Series (OBH554)
MXZ-C·VA Series (OBH584)
MXZ-D·VA Series (OBH626)
MXZ-8A·VA (OC316)
MXZ-8B·VA (OCH480)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 5
5. OUTLINES AND DIMENSIONS ························ 6
6. WIRING DIAGRAM ············································ 7
7. REFRIGERANT SYSTEM DIAGRAM ··············· 8
8. SERVICE FUNCTIONS ····································· 9
9. MICROPROCESSOR CONTROL ····················11
10. TROUBLESHOOTING ····································· 17
11. DISASSEMBLY INSTRUCTIONS ···················· 29
PARTS CATALOG (OBB555)
and MSZ-SF20VA-
have
E2
E2
No. OBH555
REVISED EDITION-A
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MXZ-B VA Series
Summary of Contents for Mitsubishi Electric MXZ-B VA Series
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Page 1: Table Of Contents
Revision A: • MSZ-SF15VA- and MSZ-SF20VA- have been added. SPLIT-TYPE AIR CONDITIONERS Please void OBH555. INDOOR UNIT No. OBH555 SERVICE MANUAL REVISED EDITION-A Models MSZ-SF15VA - MSZ-SF20VA - Outdoor unit service manual MXZ-B·VA Series (OBH554) MXZ-C·VA Series (OBH584) MXZ-D·VA Series (OBH626) MXZ-8A·VA (OC316) MXZ-8B·VA (OCH480) CONTENTS... -
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 MSZ-SF15VA MSZ-SF20VA Front panel Air fi lter Air inlet Remote controller Horizontal vane Air outlet Emergency operation switch (E.O. SW) Heat exchanger Operation Remote control indicator lamp receiving section ACCESSORIES Installation plate Installation plate fi xing screw 4 × 25 mm Remote controller holder Fixing screw for 3.5 ×... -
Page 4: Specification
SPECIFICATION MSZ-SF15VA MSZ-SF20VA Indoor model Power supply Single phase 230 V, 50 Hz Cooling Power input Heating Cooling 0.17 0.19 Running current Heating 0.17 0.19 Model RC0J40-FM Cooling 0.17 0.19 Current Heating 0.17 0.19 Dimensions W × H × D 760 ×... -
Page 5: Noise Criteria Curves
NOISE CRITERIA CURVES MSZ-SF15VA MSZ-SF20VA FUNCTION SPL(dB(A)) FUNCTION SPL(dB(A)) FAN SPEED LINE FAN SPEED LINE COOLING COOLING Super High Super High HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 NC-10 NC-10 1000 2000 4000 8000 1000 2000... -
Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSZ-SF15VA MSZ-SF20VA Unit: mm 11 20 Oblong hole 11 20 Oblong hole Installation plate Indoor unit Wall hole Ø Installation plate Piping Drain hose Air out Insulation 35 O.D Ø Liquid line 6.35-0.39m (Flared connection 6.35) Ø Ø... -
Page 7: Wiring Diagram
WIRING DIAGRAM MSZ-SF15VA MSZ-SF20VA OBH555A... -
Page 8: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MSZ-SF15VA MSZ-SF20VA Unit: mm Refrigerant pipe ø9.52 (with heat insulator) Indoor coil Indoor thermistor heat RT12 (main) exchanger Flared connection Indoor coil thermistor RT13 (sub) Room temperature thermistor RT11 Flared connection Refrigerant pipe ø6.35 (with heat insulator) Refrigerant flow in cooling Refrigerant flow in heating OBH555A... -
Page 9: Msz-Sf15Va
SERVICE FUNCTIONS MSZ-SF15VA MSZ-SF20VA 8-1. TIMER SHORT MODE For service, the following set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. (Refer to 10-7.) Set time: 3 minutes → 3 seconds (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by short circuit-of JPG and JPS.) 8-2. -
Page 10: Auto Restart Function
8-3. 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: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-SF15VA MSZ-SF20VA WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OPERATION SELECT button FAN SPEED CONTROL button ECONO COOL button VANE CONTROL button TIME, TIMER set buttons FORWARD button BACKWARD button i save button Temperature buttons WEEKLY TIMER OPERATE/STOP set button (ON/OFF) button... - Page 12 9-2. DRY ( ) OPERATION (1) Press OPERATE/STOP (ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with OPERATION SELECT button. (3) The set temperature is determined from the initial room temperature. 1.
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Page 13: Auto Vane Operation
9-5. AUTO VANE OPERATION 1. Horizontal vane (1) Vane motor drive These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approximately 12 V) transmitted from indoor microprocessor. (2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button. -
Page 14: Timer Operation
9-6. 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 15: Weekly Timer Operation
9-7. 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 weekly timer;... -
Page 16: I-Save Operation
(5) Press button to turn the weekly timer ON. ( lights.) •When the weekly timer is ON, the day of the week whose timer setting is complete, will light. Press button again to turn the weekly timer OFF. ( goes out.) NOTE: The saved settings will not be cleared when the weekly timer is turned OFF. -
Page 17: Troubleshooting
TROUBLESHOOTING MSZ-SF15VA MSZ-SF20VA 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, and then after confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug. - Page 18 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 (10-4.) disappears, the memorized failure details can be recalled. 1.
- Page 19 2. Indoor unit failure mode table Left lamp of OP- Abnormal point ERATION INDICA- Condition Remedy (Failure mode) TOR lamp Not lighted Normal — — The room temperature thermistor short or 1-time fl ash every Room temperature Refer to the characteristics of the room temperature open circuit is detected every 8 seconds dur- 0.5-second thermistor...
- Page 20 10-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates. Indoor unit oper- Indoor unit does OPERATION INDICATOR Outdoor unit does not receive the ates. lamp on the indoor unit is not operate normally. signal from re- Outdoor unit fl ashing ON and OFF. does not operate.
- Page 21 10-4. TROUBLESHOOTING CHECK TABLE Before taking measures, make sure that the symptom reappears for accurate troubleshooting. When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp flashes. OPERATION INDICATOR Lighted Blinking...
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Page 22: Trouble Criterion Of Main Parts
OPERATION INDICATOR Abnormal Operation indicator lamp Symptom Condition Remedy point Left lamp lights and lower lamp fl ashes. The operation mode of the each indoor unit MXZ type Outdoor unit is differently set to COOL (includes DRY) and • Unify the operation mode. Operation operates but HEAT at the same time, the operation mode... -
Page 23: Troubleshooting Flow
10-6. TROUBLESHOOTING FLOW A Check of indoor fan motor The indoor fan motor error has occurred, and the indoor fan does not operate. Turn OFF the power supply. Pay enough attention to the high voltage on the fan motor connector. Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch. - Page 24 B Check of remote controller and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner. Press OPERATE/STOP (ON/OFF) button on the remote controller. Look at the image of the signal transmitting section of the remote controller through the monitor of a digital camera.
- Page 25 C Check of indoor P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 Measure the resistance of indoor fan and vane motor connector CN151 from the Short circuit: motor. indoor electronic control P.C. board and turn Replace the indoor fan motor.
- Page 26 D How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in Check the power the power supply? supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and Check the wiring.
- Page 27 E 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 28 10-7. Test point diagram and voltage MSZ-SF15VA MSZ-SF20VA Indoor electronic control P.C. board Fuse (F11) Varistor (NR11) Power supply/ T3.15AL250V serial cord (CN201) Resistor (R111) AC230V Indoor fan motor (CN211) (+) DC0V or DC15V (+) 2-6V 15VDC Indoor coil thermis- (–) Fiducial tor RT12, RT13 terminal of...
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Page 29: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types (refer to (1) and (2)) 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 30: Operating Procedure
OPERATING PROCEDURE PHOTOS 2. Removing the indoor electronic control P.C. Photo 2 board, receiver P.C. board, display P.C. board, Screw of the and SW P.C. board V.A. clamp (1) Remove the panel (refer to 1.) and the corner box. (2) Remove the screw of the V.A. clamp. Remove the V.A. clamp and the indoor/outdoor connecting wire. - Page 31 OPERATING PROCEDURE PHOTOS Photo 5 3. Removing the electrical box (1) Remove the panel (refer to 1.) and the corner box. Front cover of the display holder (2) Remove the indoor/outdoor connecting wire, the SW holder, the display holder, the electrical cover and the earth wire connected to the indoor electronic control Release the P.C.
- Page 32 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2009 MITSUBISHI ELECTRIC CORPORATION Distributed in Aug. 2012. No. OBH555 REVISED EDITION-A New publication, effective Aug. 2012 Distributed in Oct. 2009. No. OBH555 7 Specifications are subject to change without notice.
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