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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-SF15VA -
MSZ-SF20VA -
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Revision D:
• MSZ-SF15/20VA-
Please void OBH555 REVISED EDITION-C.
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E1
E2
E3
E4
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E1
E2
E3
E4
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)
MXZ-E∙VA Series (OBH723)
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 ······························· 18
11. DISASSEMBLY INSTRUCTIONS ················· 30
PARTS CATALOG (OBB555)
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have been added.
E4
ER4
No. OBH555
REVISED EDITION-D
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ER3
ER4
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ER4
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Table of Contents
Related Manuals for Mitsubishi Electric MSZ-SF15VA-E1
Summary of Contents for Mitsubishi Electric MSZ-SF15VA-E1
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Page 1: Table Of Contents
Revision D: • MSZ-SF15/20VA- have been added. Please void OBH555 REVISED EDITION-C. INDOOR UNIT No. OBH555 REVISED EDITION-D SERVICE MANUAL 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) MXZ-E∙VA Series (OBH723) 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 f 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 f xing screw 4 × 25 mm Remote controller holder Fixing screw for 3.5 ×... -
Page 4: Specification
SPECIFICATION Indoor model MSZ-SF15VA MSZ-SF20VA 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 FAN SPEED FUNCTION SPL(dB(A)) LINE FAN SPEED FUNCTION SPL(dB(A)) 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 35 O.D Insulation Ø 6.35-0.39m (Flared connection 6.35) Liquid line Ø Ø... -
Page 7: Wiring Diagram
WIRING DIAGRAM MSZ-SF15VA - MSZ-SF20VA - MSZ-SF15VA - MSZ-SF20VA - MSZ-SF15VA - MSZ-SF20VA - OBH555D... -
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 OBH555D... -
Page 9: Service Functions
SERVICE FUNCTIONS MSZ-SF15VA MSZ-SF20VA 8-1. TIMER SHORT MODE For service, the following set time can be shortened by bridging JPG and JPS on the electronic control P.C. board. (Refer to 10-7.) • The set time for the ON/OFF timer can be reduced to 1 second for each minute. •... - Page 10 8-3. HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT (MSZ-SF15/20VA- A maximum of 4 indoor units with wireless remote controllers can be used in a room. To operate the indoor units individually with each remote controller, assign a number to each remote controller according to the number of the indoor unit.
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Page 11: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-SF15VA MSZ-SF20VA WIRELESS REMOTE CONTROLLER MSZ-SF15VA- MSZ-SF20VA- 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... - Page 12 INDOOR UNIT DISPLAY SECTION Operation Indicator lamp The operation indicator at the right side of the indoor unit indicates the operation state. •The following indication applies regardless of shape of the indication. Indication Operation state Room temperature Lighted The unit is operating to About 2°C or more away Blinking reach the set temperature...
- Page 13 9-5. AUTO CHANGE OVER ∙∙∙ AUTO MODE OPERATION Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation. Mode selection (1) Initial mode When unit starts the operation with AUTO operation from OFF: • If the room temperature is higher than the set temperature, operation starts in COOL mode. •...
- Page 14 (5) STOP (operation OFF) and ON TIMER standby In the following cases, the horizontal vane returns to the closed position. (a) When STOP/OPERATE (MSZ-SF·VA- )/OPERATE/STOP (Other models) button is pressed (POWER OFF). (b) When the operation is stopped by the emergency operation. (c) When ON TIMER is ON standby.
- Page 15 PROGRAM TIMER • OFF timer and ON timer can be used in combination. The set time that is reached first will operate first. • “ ” and “ ” display shows the order of OFF timer and ON timer operation. (Example 1) The current time is 8:00 PM.
- Page 16 (3) Press , and buttons to set ON/OFF, time, and temperature. E.g. : [ON], [6:00] and [24°C] are selected. Pressing selects ON/OFF timer. Pressing Pressing adjusts the time. adjusts the tem- Pressing perature. deletes timer setting. * Hold down the button to change the time quickly. Press buttons to continue setting the timer for other days and/or numbers.
- Page 17 9-9. i-save ( ) OPERATION 1. How to set i-save operation )/OPERATE/STOP (Other models) button. (1) Press STOP/OPERATE (MSZ-SF·VA- (2) Select COOL, HEAT or ECONO COOL mode. (3) Press i-save button. (4) Set the temperature, fan speed, and airf ow direction for i-save operation. NOTE: •...
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Page 18: 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 19 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 20 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 f 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 21 10-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates. Indoor unit does Indoor unit oper- OPERATION INDICATOR Outdoor unit does ates. not receive the lamp on the indoor unit is not operate normally. signal from re- Outdoor unit f ashing ON and OFF. does not operate.
- Page 22 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...
- Page 23 OPERATION INDICATOR Abnormal Operation indicator lamp Symptom Condition Remedy point Left lamp lights and lower lamp f 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 24 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 25 B Check of remote controller and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner. Press STOP/OPERATE (MSZ-SF·VA- )/OPERATE/STOP (Other models) but- Look at the image of the signal transmitting section of the ton on the remote controller.
- Page 26 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 27 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 the outdoor terminal block S1 Check the wiring.
- Page 28 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 29 10-7. Test point diagram and voltage MSZ-SF15VA MSZ-SF20VA Indoor electronic control P.C. board Fuse (F11) Power supply/ T3.15AL250V Varistor (NR11) 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 30: 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 2 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 31 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 32 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 catches.
- Page 33 OPERATING PROCEDURE PHOTOS Photo 7 7. Removing the indoor fan motor and the line flow fan (1) Remove the panel (refer to 1.) and the corner box. Catches of the water cover (2) Remove the SW holder, the display P.C. board holder, the electrical box (refer to 3.) and the nozzle assem- Motor band bly (Refer to 4.).
- Page 34 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2009 MITSUBISHI ELECTRIC CORPORATION Distributed in Jan. 2016. No. OBH555 REVISED EDITION-D Distributed in Dec. 2013. No. OBH555 REVISED EDITION-C Distributed in Apr. 2013. No. OBH555 REVISED EDITION-B Distributed in Aug.