Table of Contents
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SPLIT-TYPE AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Models
MS-18NV -
MS-18NV -
E4
· MU-18NV -
( WH )
E4
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. SPECIFICATION·················································4
4. OUTLINES AND DIMENSIONS ·························5
5. WIRING DIAGRAM ············································6
6. REFRIGERANT SYSTEM DIAGRAM ················7
7. PERFORMANCE CURVES ································8
8. MICROPROCESSOR CONTROL ····················10
9. SERVICE FUNCTIONS ····································16
10. TROUBLESHOOTING······································18
11. DISASSEMBLY INSTRUCTIONS·····················24
12. PARTS LIST······················································28
13. OPTIONAL PARTS···········································31
No. OB228
E4
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Related Manuals for Mitsubishi Electric MS-18NV
Summary of Contents for Mitsubishi Electric MS-18NV
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Page 1: Table Of Contents
SPLIT-TYPE AIR CONDITIONERS No. OB228 SERVICE MANUAL Wireless type Models MS-18NV - · MU-18NV - ( WH ) CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················2 3. SPECIFICATION·················································4 4. OUTLINES AND DIMENSIONS ·························5 5. WIRING DIAGRAM ············································6 6. REFRIGERANT SYSTEM DIAGRAM ················7 MS-18NV - 7. -
Page 2: Technical Changes
TECHNICAL CHANGES MS-18NV - MS-18NV - 1. Indoor electronic control P.C. board has changed. MU-18NV - MU-18NV - 1. Compressor has changed.(NH-33VMDT PH-33VPET) 2. Outdoor heat exchanger has changed. 3. Refrigerant filling capacity(R-22) has changed.(1.65kg 1.05kg) PART NAMES AND FUNCTIONS... -
Page 3: Outdoor Unit
OUTDOOR UNIT MU-18NV - REMOTE CONTROLLER MS-18NV - Signal transmitting section Operation display section OPERATE /STOP (ON /OFF)button OPERATION SELECT button TEMPERATURE buttons FAN SPEED CONTROL button VANE CONTROL button SLEEP button SWING buttons ON-TIMER button OFF-TIMER button RESET button CLOCK SET button HR. -
Page 4: Specification
SPECIFICATION Model MS-18NV - Function Cooling Power supply Single phase, 220-240V, 50Hz Capacity Capacity Dehumidification K /h INDOOR 756 / OUTDOOR 2340-2400 Air flow(Hi) Power outlet Running current Power input 1,910-2,010 A(kW) Auxiliary heater — Electrical data Power factor 95-92... -
Page 5: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit : mm MS-18NV - Indoor unit 4holes 11o20 INDOOR UNIT Wall hole [75 Installation plate 1015 Installation plate Liquid line [8-0.5m Gas line [12-0.43m Air in Insulation [50 O.D [28 I.D Drain hose [16 Air out... -
Page 6: Wiring Diagram
WIRING DIAGRAM MS-18NV - MODEL WIRING DIAGRAM INDOOR UNIT RT12 T O OUTDOOR HIC1 IC141 UNIT CONNECTING 220-240V~ CN201 CN211 TRANS POWER SUPPLY RT11 CORD ELECTRONIC CONTROL P.C BOARD ~/N 220-240V 50Hz RECEIVER DISPLAY CIRCUITBREAKER P.C.BOARD P.C.BOARD GRN/YLW REMOTE CONTROLLER... -
Page 7: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit:mm MS-18NV - MU-18NV - OUTDOOR UNIT INDOOR UNIT Refrigerant pipe [15.88 (Option) (with heat insulator) Accumulator Indoor coil Stop valve Indoor Outdoor thermistor (with service port) heat heat RT12 exchanger exchanger Strainer Distributor Flared connection Compressor... -
Page 8: Performance Curves
PERFORMANCE CURVES MS-18NV - The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions. Since operating conditions vary according to the areas where these units are installed. The following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve. - Page 9 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation 1 1 Both indoor and outdoor unit are under the same temperature/humidity condition. Dry-bulb temperature Relative humidity(%) 2 2 Air flow should be set at MAX. 3 3 The unit of pressure has been changed to MPa on the international system of units(SI unit system). The conversion factor is : 1(MPa •...
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Page 10: Microprocessor Control
MICROPROCESSOR CONTROL MS-18NV - WIRELESS REMOTE CONTROLLER Once the operation mode are set, the same operation mode can be repeated by simply turning the OPERATE/STOP(ON/OFF) button ON. Indoor unit receives the signal with a beep tone. Signal transmitting section When the system turns off, 3-minute time delay will operate to protect system from overload and compressor will not restart for 3 minutes. - Page 11 (4) The initial set temperature is decided by the initial room temperature. Mode Initial room temperature Initial set temperature 26: or more COOL mode of "I FEEL CONTROL" Initial room temperature 25: to 26: minus 2: Initial room temperature DRY mode of more than13:, less than 25: "I FEEL CONTROL"...
- Page 12 Operation chart Example Compressor Outdoor fan (continuously at set speed) Indoor fan —DRY mode of “I FEEL CONTROL”— The system for dry operation uses the same refrigerant circuit as the cooling circuit. The compressor and the indoor fan are controlled by the room temperature. By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease.
- Page 13 8-2. COOL ( ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. Operation Indicator lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with the OPERATION SELECT button. (3) Press the TEMPERATURES button. (TOO WARM or TOO COOL button) to select the desired temperature.
- Page 14 (3) Positioning The vane is once pressed to the vane stopper below to confirm the standard position and then set to the desired angle. Confirming of standard position is performed in case of follows. (a) When the OPERATE/STOP(ON/OFF) button is pressed. (b) When the vane control is changed from AUTO to MANUAL.
- Page 15 2. Cancel Timer setting can be cancelled with the TIMER CONTROL buttons. (“ ” or “ ”) To cancel the ON timer, press the “ ” button. To cancel the OFF timer, press the “ ” button. Timer is cancelled and the display of set time disappears. PROGRAM TIMER The OFF timer and ON timer can be used in combination.
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Page 16: Service Functions
SERVICE FUNCTIONS MS-18NV - 9-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS on the electronics control P.C. board. The time will be shortened as follows. 3-minutes delay : 3-minutes 3-seconds. - Page 17 9-3. AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are memorized by the indoor electronic control P.C.board. The “AUTO RESTART FUNCTION” sets to work the moment power has restored after power failure.Then, the unit will restart automatically.
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Page 18: Troubleshooting
TROUBLESHOOTING MS-18NV - 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 mis-wiring. 2. Take care the following during servicing. 1) Before servicing the air conditioner, be sure to first turn off the remote controller to stop the unit, and then after confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug. - Page 19 10-2. Instruction of troubleshooting Start Indoor unit doesn’t Operation Indicator lamp Indoor unit Indoor unit doesn’t receive the signal from on the indoor unit is operates. Outdoor receive the signal remote controller. flashing on and off. unit doesn’t from remote Also, Operation Indicator controller.
- Page 20 MS-18NV - 2. Trouble criterion of main parts Part name Check method and criterion Figure Room Measure the resistance with a tester. temperature (Part temperature 10°C ~ 30°C) thermistor Normal Abnormal Indoor coil 8k½ ~ 20k½ Opened or short-circuited thermistor Measure the resistance between the terminals with a tester.
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Page 21: Check Of Indoor Fan Motor
Check of indoor fan motor Indoor fan does not operate. Turn OFF the power supply. Check connector CN211 visually. Are lead wires connected? Is soldered point normal? Resolder it. Reconnect the lead wires. Disconnect lead wires from connector CN211 on the indoor electronic control P.C. board. Measure resistance between lead wires No.1 and No.4 and then No.1 and No.2. -
Page 22: Check Of Indoor Electronic Control P.c. Board
Check of indoor electronic control P.C. board The unit doesn’t operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch. Check the both “parts side”and “pattern side” of indoor electronic control P.C. board visually. Turn OFF the power supply. - Page 23 TEST POINT DIAGRAM AND VOLTAGE MS-18NV - Indoor electronic control P.C. board Fan motor power supply Fuse 250V AC 3.15A Power supply input 220-240V AC C144 5V DC C144 Room temperature thermistor(RT11) Indoor coil thermistor(RT12) Timer short mode point Emergency...
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Page 24: Disassembly Instructions
1Hold the sleeve, and 2Pull the terminal while pull out the terminal pushing the locking slowly. lever. 11-1. MS-18NV - INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the front panel Photo 1 (1) Remove the screws caps at the down of the front panel. - Page 25 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box screw Photo 3 (1) Remove the front panel. (Refer to 1) (2) Remove the electrical cover. (3) Disconnect the connector of the indoor coil thermistor. (4) Disconnect the motor connector (CN211 and CN121) and the vane motor connector (CN151) on the electronic control P.C.
- Page 26 11-2. MU-18NV - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the cabinet. (2) Hold the bottom of the cabinet on the both side to remove the cabinet. Screws Service panel Photo 2 Screws 2.
- Page 27 OPERATING PROCEDURE PHOTOS Hook 3. Removing the outdoor fan motor Photo 4 Connector (1) Remove the cabinet. (Refer to 1) (2) Disconnect the connector remove the hooked lead wire from the fan motor. (3) Remove the propeller nut and remove the propeller fan. (4) Remove screws securing the fan motor.
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Page 28: Parts List
PARTS LIST MS-18NV - (WH) 12-2. INDOOR UNIT 12-1. INDOOR UNIT HEAT EXCHANGER STRUCTURAL PARTS Optional parts (See page 31.) SCREW CAP 12-1. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. Symbol Q'ty/unit in Wiring Part No. - Page 29 MS-18NV - (WH) 12-4. ACCESSORY PARTS 12-3. INDOOR UNIT AND REMOTE CONTROLLER FUNCTIONAL PARTS AND ELECTRICAL PARTS SLEEVE BEARING INDOOR COIL ROOM TEMPERATURE THERMISTOR THERMISTOR 12-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part number that are circled are not shown in the illustration.
- Page 30 MU-18NV - 12-5. OUTDOOR UNIT STRUCTURAL PARTS Part number that are circled are not shown in the illustration. Symbol Q'ty/unit in Wiring Part No. Part Name Remarks MU-18NV- Diagram E02 141 232 CABINET E02 141 521 GRILLE E02 141 245 SERVICE PANEL E02 217 630 OUTDOOR HEAT EXCHANGER...
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Page 31: Optional Parts
DO NOT reuse AIR CLEANING FILTER even if it is washed. DO NOT remove or attach AIR CLEANING FILTER during unit operation. Part No. Model MS-18NV - MAC-1100FT Air cleaning filter (White bellows type) 13-2. DEODORIZING FILTER DEODORIZING FILTER removes ammonia and hydrogen sulphide emitted from tobacco, and odor of pets. - Page 32 HEAD OFFICE MITSUBISHI DENKI BLDG.MARUNOUCHI TOKYO100-8310 TELEX J24532 CABLE MELCO TOKYO C C Copyright 1999 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD New publication, effective Jan. 1999 Issued in Jan. 1999. No.OB228 305 Specifications subject to change without notice. Printed in Japan...