OB271--1.qxp 2/7/01 9:00 AM Page 1 SPLIT-TYPE AIR CONDITIONERS No. OB271 SERVICE MANUAL Wireless type Models MS-18RV MS-24RV MS-30RV - E1 (WH) E1 (WH) E1 (WH) · MU-18RV · MU-24RV · MU-30RV - E1 E1 E1 CONTENTS MS-18RV MS-24RV - E1 E1 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················3 3. SPECIFICATION·················································6 4. NOISE CRITERIA CURVES ·······························8 5.
OB271--1.qxp 1 2/7/01 9:00 AM Page 2 TECHNICAL CHANGES MS-18NV - E4 ➔MS-18RV - E1 MS-24NV - E2 ➔MS-24RV - E1 1. Remote controller has been changed. • SLEEP MODE function has removed. • ECONO COOL operation has added. • SWING button is removed, but SWING MODE function is available by VANE CONTROL button. MS-30RV - E1 New model MU-18NV - E4 ➔MU-18RV - E1 MU-24NV - E2 ➔MU-24RV - E1 1. Outdoor model name has changed.
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OB271--1.qxp 2/7/01 9:00 AM Page 4 ACCESSORIES Indoor unit MS-18RVMS-24RV1 2 3 4 5 6 7 1 6 1 2 2 1 1 Installation plate Installation plate fixing screw 4 o 25 mm Remote controller mouting hardware Fixing screw for 3 o 3.5 o 1.
OB271--1.qxp 2/7/01 9:00 AM Page 5 REMOTE CONTROLLER MS-30RV - E1 Signal transmitting section Operation display section PM OPERATE/ STOP (ON/ OFF)button AM TOO ON/OFF WARM TOO COOL TEMPERATURE buttons Open the front lid. CLOCK PM AM TOO ON/OFF WARM VANE button (Horizontal vane button) TOO COOL FAN STOP VANE START I FEEL COOL FAN FAN SPEED CONTROL button OFF-TIMER button DRY ON-TIMER button MODE WIDE VANE HR. OPERATION SELECT button ECONO COOL LONG ECONO COOL button MIN. HR.
OB271--1.qxp 3 2/7/01 9:00 AM Page 6 SPECIFICATION Indoor model Function Capacity Power supply Special remarks Fan motor Compressor Electrical data Special remarks Fan motor Electrical data Capacity kW Dehumidification R/h Air flow(High) K /h Power outlet A Running current A Power input W Auxiliary heater A(kW) Power factor % Starting current A Fan motor current A Coefficient of performance(C.O.
OB271--1.qxp 2/7/01 9:00 AM Page 7 Indoor model Function MS-30RV - E1 Cooling Single phase 220-240V, 50Hz 8.4 4.5 960 25 15.7-15.8 3,380-3,520 — 98-93 82-84 0.33-0.35 2.49-2.39 RC4V40-AA WHT-BLK 138.2 BLK-RED 159.0 1,100O325O227 16 5 47 1,280 3 10 10 10 MU-30RV - E1 2,880-3,000 14.81-14.87 0.56-0.58 NH-56VNHT 2,700 C-R 0.66 C-S 1.58 RA6V75-AA WHT-BLK 62.8 BLK-YLW 55.9 YLW-RED 26.
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OB271--1.qxp 2/7/01 9:00 AM Page 9 MS-30RV - E1 NOTCH SPL(dB(A)) High 47 LINE OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR Test conditions, Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: 90 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 10 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 63 125 NC-20 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz MU-30RV - E1 NOTCH SPL(dB(A)) High 55 LINE OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.
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Page 11 MS-30RV - E1 INDOOR UNIT Unit: mm Installation plate Indoor unit 173 7.5 98 98 414.5 414.5 173 2.5 47 255.5 1068 Wall hole [ 75 225 1100 325 Installation plate { Air in 791 56 253 Air out 19 162 58 5 Wireless remote controller 11 Liquid line [ 9.52- 0.5m Gas line [ 19-0.43m Insulation [ 50 O.D [ 32 I.D Drain hose [ 16 (Connected part O.D) Insulation [ 28 315 2/7/01 9:00 AM 47 OB271--1.
OB271--1.qxp 2/7/01 9:00 AM Page 12 MU-30RV - E1 Unit: mm OUTDOOR UNIT Outdoor Unit-Necessary surrounding clearance 200 39.5 27.
OB271--1.qxp 2/7/01 9:00 AM 6 Page 13 WIRING DIAGRAM MS-18RV - E1 MODEL WIRING DIAGRAM INDOOR UNIT TB BRN HIC1 BRN 4 CN201 3 1 1 BLU BLU 3 52C TRANS BRN BLU DSAR POWER SUPPLY CORD ~/N 220-240V 50Hz PE CN 121 C11 N 220-240V~ BLU 2 BLU WHT CN 112 IC141 NR11 F12 2 GRN/YLW L TO OUTDOOR UNIT CONNECTING CN 102 CN 151 CN 101 3 CN211 4 2 1 F11 LD1 RT12 BRN YLW GRY WHT MF RED BLK CN RT11 ELECTRONIC CONTROL P.C. BOARD 111 5 3 CIRCUIT BREAKER 3 MV DISPLAY RECEIVER P.C.
OB271--1.qxp 2/7/01 9:01 AM Page 14 MS-24RV - E1 MODEL WIRING DIAGRAM INDOOR UNIT TO OUTDOOR UNIT CONNECTING 3 TB HIC1 RED IC141 N F12 BLU 2 BLU 1 BLU 2 L WHT CN 151 DSAR GRN/YLW CN 111 RT11 3 BRN YLW GRY WHT RED BLK CN211 4 2 1 MF CN 101 ELECTRONIC CONTROL P.C. BOARD 5 3 3 MV DISPLAY P.C.
OB271--1.qxp 2/7/01 9:01 AM MS-30RV - E1 Page 15 MODEL WIRING DIAGRAM INDOOR UNIT TO OUTDOOR UNIT CONNECTING 12V 4 3 2 1 HIC1 3 TB N BLU 220-240V ~ L BRN GRN/YLW NR11 3 2 1 TRANS TAB12 F11 15 MV2 MV2 MV1 CN 121 C11 SR141 1 3 4 3 BLK GRY YLW BRN WHT RED MF CN211 CN 102 CN 151 RT12 CN112 CN201 RED RT13 CN 101 ELECTRONIC CONTROL P.C. BOARD CN 111 3 RT11 3 DISPLAY P.C.BOARD RECEIVER P.C.
OB271--1.qxp 2/7/01 9:01 AM MU-30RV - Page 16 MODEL WIRING DIAGRAM E1 OUTDOOR UNIT MF RT62 RT63 6 5 4 3 2 1 RED ORN C2 1 2 3 CN711 CN724 SR62 SR61 X52 N COM NO F61 BRN 1 3 5 DEICER P.C.
OB271--1.qxp 2/7/01 9:01 AM 7 Page 17 REFRIGERANT SYSTEM DIAGRAM Unit:mm MS-18RV - E1 INDOOR UNIT MU-18RV - E1 OUTDOOR UNIT Refrigerant pipe [15.88 (with heat insulator) Accumulator Indoor coil thermistor RT12 Indoor heat exchanger Stop valve (with service port) Strainer Outdoor heat exchanger Distributor Flared connection Room temperature thermistor RT11 Compressor Capillary tube [3.0X[2.0X700 Stop valve Refrigerant pipe [6.
OB271--1.qxp 2/7/01 9:01 AM Page 18 Unit:mm MS-30RV - E1 INDOOR UNIT MU-30RV - E1 OUTDOOR UNIT Refrigerant pipe [15.88 (with heat insulator) Strainer Indoor heat exchanger Indoor coil thermistor RT12(main) Stop valve (with service port) Indoor coil thermistor RT13(sub) Room temperature thermistor RT11 Outdoor heat exchanger Discharge temperature thermistor RT62 Flared connection Accumulator Compressor Capillary tube [4.0✕[2.
OB271--1.qxp 2/7/01 9:01 AM Page 19 MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Piping size O.D : mm Max. length : m Model Gas A MS-18RV MU-18RV - E1 MS-24RV MU-24RV - E1 MS-30RV MU-30RV - E1 Length of connecting pipe : m Liquid Indoor unit Outdoor unit Gas 0.43 Liquid 0.5 Gas 0 Liquid 0 6.35 E1 15 15.88 E1 9.52 30 E1 MAX. HEIGHT DIFFERENCE Indoor unit w Max. Height difference 5m (MS-18/24RV) /15m(MS-30RV) Refrigerant Piping Max.
OB271--1.qxp 8 2/7/01 9:01 AM Page 20 PERFORMANCE CURVES MS-18RV - E1 MS-24RV - E1 MS-30RV - E1 MU-18RV - E1 MU-24RV - E1 MU-30RV - E1 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.
OB271--1.qxp 2/7/01 9:01 AM Page 21 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation 1 Both indoor and outdoor unit are under the same temperature/humidity condition. Dry-bulb temperature Relative humidity(%) 20 50 25 60 30 70 2 Air flow should be set at MAX. 3 The unit of pressure has been changed to MPa on the international system of units(SI unit system). f[Gauge]) The conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f MU-18RV - E1 7 0.7 6 0.6 5 0.
OB271--1.qxp 2/7/01 9:01 AM Page 22 PERFORMANCE DATA COOL operation MS-18RV - E1 : MU-18RV - E1 (220V) CAPACITY: 5.1(kW) SHF : 0.66 INPUT: 1910(W) 21 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT 21 18 5.99 2.88 0.48 1528 21 20 6.25 2.25 0.36 1604 22 18 5.99 3.12 0.52 1528 22 20 6.25 2.50 0.40 1604 22 22 6.50 1.82 0.28 1662 23 18 5.99 3.36 0.56 1528 23 20 6.25 2.75 0.44 1604 23 22 6.50 2.08 0.32 1662 24 18 5.99 3.60 0.60 1528 24 20 6.25 3.00 0.48 1604 24 22 6.50 2.34 0.36 1662 24 24 6.83 1.64 0.
OB271--1.qxp 2/7/01 9:01 AM Page 23 PERFORMANCE DATA COOL operation MS-18RV - E1 : MU-18RV - E1 (220V) CAPACITY: 5.1(kW) SHF : 0.66 INPUT: 1910(W) OUTDOOR DB(:) 35 40 43 46 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 5.00 2.40 0.48 1872 4.59 2.20 0.48 1986 4.41 2.12 0.48 2025 4.23 2.03 0.48 2063 18 21 5.25 1.89 0.36 1948 4.90 1.76 0.36 2044 4.72 1.70 0.36 2101 4.54 1.63 0.36 2158 20 21 5.00 2.60 0.52 1872 4.59 2.39 0.52 1986 4.41 2.29 0.52 2025 4.23 2.20 0.
OB271--1.qxp 2/7/01 9:01 AM Page 24 PERFORMANCE DATA COOL operation MS-18RV - E1 : MU-18RV - E1 (240V) CAPACITY: 5.1(kW) SHF : 0.66 INPUT: 2010(W) 21 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT 21 18 5.99 2.88 0.48 1608 21 20 6.25 2.25 0.36 1688 22 18 5.99 3.12 0.52 1608 22 20 6.25 2.50 0.40 1688 22 22 6.50 1.82 0.28 1749 23 18 5.99 3.36 0.56 1608 23 20 6.25 2.75 0.44 1688 23 22 6.50 2.08 0.32 1749 24 18 5.99 3.60 0.60 1608 24 20 6.25 3.00 0.48 1688 24 22 6.50 2.34 0.36 1749 24 24 6.83 1.64 0.
OB271--1.qxp 2/7/01 9:01 AM Page 25 PERFORMANCE DATA COOL operation MS-18RV - E1 : MU-18RV - E1 (240V) CAPACITY: 5.1(kW) ISHF : 0.66 NPUT: 2010(W) OUTDOOR DB(:) 35 40 43 46 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 5.00 2.40 0.48 1970 4.59 2.20 0.48 2090 4.41 2.12 0.48 2131 4.23 2.03 0.48 2171 18 21 5.25 1.89 0.36 2050 4.90 1.76 0.36 2151 4.72 1.70 0.36 2211 4.54 1.63 0.36 2271 20 21 5.00 2.60 0.52 1970 4.59 2.39 0.52 2090 4.41 2.29 0.52 2131 4.23 2.20 0.
OB271--1.qxp 2/7/01 9:01 AM Page 26 PERFORMANCE DATA COOL operation MS-24RV - E1 : MU-24RV - E1 (220V) CAPACITY: 6.4(kW) SHF : 0.64 INPUT: 2780(W) 21 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT 21 18 7.52 3.46 0.46 2224 21 20 7.84 2.67 0.34 2335 22 18 7.52 3.76 0.50 2224 22 20 7.84 2.98 0.38 2335 22 22 8.16 2.12 0.26 2419 23 18 7.52 4.06 0.54 2224 23 20 7.84 3.29 0.42 2335 23 22 8.16 2.45 0.30 2419 24 18 7.52 4.36 0.58 2224 24 20 7.84 3.61 0.46 2335 24 22 8.16 2.77 0.34 2419 24 24 8.58 1.89 0.
OB271--1.qxp 2/7/01 9:01 AM Page 27 PERFORMANCE DATA COOL operation MS-24RV - E1 : MU-24RV - E1 (220V) CAPACITY: 6.4(kW) SHF : 0.64 INPUT: 2780(W) OUTDOOR DB(:) 35 40 43 46 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 6.27 2.89 0.46 2724 5.76 2.65 0.46 2891 5.54 2.55 0.46 2947 5.31 2.44 0.46 3002 18 21 6.59 2.24 0.34 2836 6.14 2.09 0.34 2975 5.92 2.01 0.34 3058 5.70 1.94 0.34 3141 20 21 6.27 3.14 0.50 2724 5.76 2.88 0.50 2891 5.54 2.77 0.50 2947 5.31 2.66 0.
OB271--1.qxp 2/7/01 9:01 AM Page 28 PERFORMANCE DATA COOL operation MS-24RV - E1 : MU-24RV - E1 (240V) CAPACITY: 6.4(kW) SHF : 0.64 INPUT: 2900(W) 21 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT 21 18 7.52 3.46 0.46 2320 21 20 7.84 2.67 0.34 2436 22 18 7.52 3.76 0.50 2320 22 20 7.84 2.98 0.38 2436 22 22 8.16 2.12 0.26 2523 23 18 7.52 4.06 0.54 2320 23 20 7.84 3.29 0.42 2436 23 22 8.16 2.45 0.30 2523 24 18 7.52 4.36 0.58 2320 24 20 7.84 3.61 0.46 2436 24 22 8.16 2.77 0.34 2523 24 24 8.58 1.89 0.
OB271--1.qxp 2/7/01 9:01 AM Page 29 PERFORMANCE DATA COOL operation MS-24RV - E1 : MU-24RV - E1 (240V) CAPACITY: 6.4(kW) SHF : 0.64 INPUT: 2900(W) OUTDOOR DB(:) 35 40 43 46 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 6.27 2.89 0.46 2842 5.76 2.65 0.46 3016 5.54 2.55 0.46 3074 5.31 2.44 0.46 3132 18 21 6.59 2.24 0.34 2958 6.14 2.09 0.34 3103 5.92 2.01 0.34 3190 5.70 1.94 0.34 3277 20 21 6.27 3.14 0.50 2842 5.76 2.88 0.50 3016 5.54 2.77 0.50 3074 5.31 2.66 0.
OB271--1.qxp 2/7/01 9:01 AM Page 30 PERFORMANCE DATA COOL operation MS-30RV - E1 : MU-30RV - E1 (220V) CAPACITY: 8.4(kW) SHF : 0.62 INPUT: 3380(W) 21 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT 21 18 9.87 4.34 0.44 2704 21 20 10.29 3.29 0.32 2839 22 18 9.87 4.74 0.48 2704 22 20 10.29 3.70 0.36 2839 22 22 10.71 2.57 0.24 2941 23 18 9.87 5.13 0.52 2704 23 20 10.29 4.12 0.40 2839 23 22 10.71 3.00 0.28 2941 24 18 9.87 5.53 0.56 2704 24 20 10.29 4.53 0.44 2839 24 22 10.71 3.43 0.32 2941 24 24 11.26 2.25 0.
OB271--2.qxp 2/7/01 9:03 AM Page 31 PERFORMANCE DATA COOL operation MS-30RV - E1 : MU-30RV - E1 (220V) CAPACITY: 8.4(kW) SHF : 0.62 INPUT: 3380(W) OUTDOOR DB(:) 35 40 43 46 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 8.23 3.62 0.44 3312 7.56 3.33 0.44 3515 7.27 3.20 0.44 3583 6.97 3.07 0.44 3650 18 21 8.65 2.77 0.32 3448 8.06 2.58 0.32 3617 7.77 2.49 0.32 3718 7.48 2.39 0.32 3819 20 21 8.23 3.95 0.48 3312 7.56 3.63 0.48 3515 7.27 3.49 0.48 3583 6.97 3.35 0.
OB271--2.qxp 2/7/01 9:03 AM Page 32 PERFORMANCE DATA COOL operation MS-30RV - E1 : MU-30RV - E1 (240V) CAPACITY: 8.4(kW) SHF : 0.62 INPUT: 3520(W) 21 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT 21 18 9.87 4.34 0.44 2816 21 20 10.29 3.29 0.32 2957 22 18 9.87 4.74 0.48 2816 22 20 10.29 3.70 0.36 2957 22 22 10.71 2.57 0.24 3062 23 18 9.87 5.13 0.52 2816 23 20 10.29 4.12 0.40 2957 23 22 10.71 3.00 0.28 3062 24 18 9.87 5.53 0.56 2816 24 20 10.29 4.53 0.44 2957 24 22 10.71 3.43 0.32 3062 24 24 11.26 2.25 0.
OB271--2.qxp 2/7/01 9:03 AM Page 33 PERFORMANCE DATA COOL operation MS-30RV - E1 : MU-30RV - E1 (240V) CAPACITY: 8.4(kW) SHF : 0.62 INPUT: 3520(W) OUTDOOR DB(:) 35 40 43 46 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 8.23 3.62 0.44 3450 7.56 3.33 0.44 3661 7.27 3.20 0.44 3731 6.97 3.07 0.44 3802 18 21 8.65 2.77 0.32 3590 8.06 2.58 0.32 3766 7.77 2.49 0.32 3872 7.48 2.39 0.32 3978 20 21 8.23 3.95 0.48 3450 7.56 3.63 0.48 3661 7.27 3.49 0.48 3731 6.97 3.35 0.
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OB271--2.qxp 2/7/01 9:03 AM Page 35 ● Once the mode is fixed, the mode does not change by room temperature afterwards. ● Under the ON-TIMER ( ) operation, the mode is determined according to the room temperature at the set time the operation starts. ● When the system is stopped on the remote controller, and restarted within 2 hours in “I FEEL CONTROL” ( ) mode, the system operates in previous mode automatically regardless of the room temperature.
OB271--2.qxp 2/7/01 9:03 AM Page 36 9-1-1. COOL mode of “I FEEL CONTROL” 1. Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button. Difference between room In AUTO the fan speed is as follows. Fan speed temperature and set temInitial temperature difference perature during operation Room temperature minus set temperature : 3 degrees or more········································High Room temperature minus set temperature : Between 1 and 1.
OB271--2.qxp 2/7/01 9:03 AM Page 37 9-1-2. 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. 1. Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button. However, in AUTO fan operation, fan speed becomes Low. 2.
OB271--2.qxp 2/7/01 9:03 AM 9-2. COOL ( Page 38 ) 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 TEMPERATURE buttons. (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 16 ~ 31°C. w Indoor fan continues to operate regardless of thermostat’s OFF-ON at set speed. w Coil frost prevention is as same as COOL mode of “I FEEL CONTROL”.
OB271--2.qxp 2/7/01 9:03 AM Page 39 9-6. 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 (approx. 12V) transmitted from microprocessor. (2) The horizontal vane angle and mode change as follows by pressing the VANE CONTROL button(MS-18/24RV)/ VANE button(MS-30RV).
OB271--2.qxp 2/7/01 9:03 AM Page 40 (8) ECONO COOL ( ) operation (ECONOmical operation) When the ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher than that in COOL mode. Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger(Tp(w 1)). SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher than that in COOL mode, the air conditioner can keep comfort.
OB271--2.qxp 2/7/01 9:03 AM Page 41 2. Vertical vane (1) Vane motor drive This model is equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approx. 12V) transmitted from indoor microprocessor. (2) The vertical vane angle and mode changes as follows by pressing the WIDE VANE button.
OB271--2.qxp 2/7/01 9:04 AM Page 42 PROGRAM TIMER ● The OFF timer and ON timer can be used in combination. ●“ ”and “ ” display shows the order of the OFF timer and ON timer operation. (Example 2) The current time is 11:00 AM. (Example 1) The current time is 8:00 PM. The unit turns on at 5:00 PM, and off at 9:00 PM. The unit turns off at 11:00 PM, and on at 6:00 AM. PM PM AM PM NOTE : TIMER setting will be cancelled by power failure or breaker functioning. 9-8.
OB271--2.qxp 2/7/01 9:04 AM Page 43 9-9. LEV control General operation Basic specification LEV (Expansion valve) is controlled by “Thermostat ON” commands given from the unit. Controlled range Minimum : 54 pulse, Maximum : 500 pulse Drive speed 30 ~ 90 pulse / second Opening set The setting is always in opening direction. (When closing LEV, open the LEV to adjust to set opening after closing the LEV at once.
OB271--2.qxp 2/7/01 9:04 AM Page 44 2 When the temperature difference RT between indoor coil thermistor (main) RT12 and indoor coil thermistor (sub) RT13 in the indoor unit is 2: or more for a fixed time at cool or dry operation, the target discharge temperature is changed. After the temperature is changed, when temperature difference RT is 3: or more, the target temperature is changed again.
OB271--2.qxp 2/7/01 9:04 AM 10 Page 45 SERVICE FUNCTIONS MS-18RV - E1 MS-24RV - E1 MS-30RV - E1 10-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board. The time will be shortened as follows. (Refer to page 58 or 59.) Set time : 1 minute ➔ 1-second Set time : 3 minute ➔ 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by short circuit of JPG and JPS.) 10-2. P.C.
OB271--2.qxp 2/7/01 9:04 AM Page 46 10-3. 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. However if the unit is operated in “I FEEL CONTROL.” mode before power failure, the operation is not memorized. In “I FEEL CONTROL.
OB271--2.qxp 2/7/01 9:04 AM 11 Page 47 TROUBLESHOOTING MS-18RV - E1 MS-24RV - E1 MS-30RV - E1 MU-18RV - E1 MU-24RV - E1 MU-30RV - E1 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 mis-wiring. 2. Take care the following during servicing.
OB271--2.qxp 2/7/01 9:04 AM Page 48 11-2. Instruction of troubleshooting Start Indoor unit operates. Outdoor unit doesn't operate. Outdoor unit operates in only Test Run operation. Check room temperature thermistor. Refer to "Test point diagram and voltage" on page 34. w1. Flash on and off at 0.5second intervals Cause: Indoor/ Outdoor unit • Mis-wiring Outdoor unit doesn't operate even in Test Run operation. Refer to D "Check of outdoor unit" on page 53 or 54.
OB271--2.qxp 2/7/01 9:04 AM Page 49 1. Troubleshooting check table • The following indication does not depend on the shape of lamp. flashing Operation Indicator · Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible abnormalities. · The OPERATION INDICATOR lamp (on the left-hand side) is lighted during normal operation. Before taking measures, make sure that the symptom reappears for accurate troubleshooting. Self check table No.
OB271--2.qxp 2/7/01 9:04 AM MS-18RV - E1 MS-24RV - E1 MS-30RV - E1 Page 50 MU-18RV - E1 MU-24RV - E1 MU-30RV - E1 2. Trouble criterion of main parts Part name Room temperature thermistor(RT11) Check method and criterion Measure the resistance with a tester. (Part temperature 10˚C ~ 30˚C) Normal Abnormal Indoor coil thermistor Open or short-circuit 8 k" ~ 20 k" (RT12(main), RT13(sub)) Normal 120 k" ~ 800 k" Abnormal Open or short-circuit Measure the resistance with a tester.
OB271--2.qxp 2/7/01 9:04 AM Page 51 Part name Check method and criterion Figure Measure the resistance between the terminals with a tester. (Part temperature –10˚C ~ 40˚C) MS-18RV MAIN AUX. Color of lead wire WHT – BLK BLK – YLW YLW – RED Abnormal MS-24RV MAIN1 AUX. MAIN2 P Normal MS-30RV 55.4 ~ 67.7 " 49.3 ~ 60.3 " 22.9 ~ 28.0 " Abnormal YLW BLK RED ORN WHT MS-30RV MAIN Open or short circuit AUX.1 AUX.
OB271--2.qxp 2/7/01 9:04 AM Page 52 A Check of indoor fan motor Indoor fan doesn’t operate. No Turn OFF the power supply. Check connector CN211 visually. Are lead wires connected? Yes Is soldering point of the connector correctly soldered? No Re-solder it. Yes Re-connect 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(MS-18/24RV) : No.1 and No.4 and then No.
OB271--2.qxp 2/7/01 9:04 AM Page 53 C 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. MS-18/24RV Check the both “parts side”and “pattern side” of indoor electronic control P.C. board visually. 1 Turn OFF the power supply. Remove indoor fan motor connector CN211 and vane motor connector CN151 from the indoor electronic control P.C.
OB271--2.qxp 2/7/01 9:04 AM Page 54 MS-30RV Turn ON the power supply. Is there 220-240V AC between L-N on the outdoor terminal block? No Check the outdoor power supply and connection of wiring. Yes Compressor does not operate. Is there 5V DC between No J101 + - J401 on the deicer P.C. board? w1 Yes Operate the unit in COOL mode by pressing the EMERGENCY OPERATION switch.
OB271--2.qxp 2/7/01 9:04 AM Page 55 E Check of outdoor unit Compressor and / or outdoor fan motor doesn’t stop. 1 Turn OFF the power supply. 2 After 30 seconds, turn ON the power supply again. 3 Operate the unit in COOL mode by pressing the EMERGENCY OPERATION switch. 4 Operate the unit for 1 minute or more and stop it by pressing the EMERGENCY OPERATION switch again.
OB271--2.qxp 2/7/01 9:04 AM Page 56 F How to check mis-wiring Outdoor unit doesn’t operate. w Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self -check to be displayed in 3 seconds. Start • Turn ON the power supply. • Press once EMERGENCY OPERATION switch. After 3 minutes, mis-wiring is indicated (0.5-second ON, 0.5-second OFF) on OPERATION INDICATOR lamp on indoor unit.w Yes Make them sure.
OB271--2.qxp 2/7/01 9:04 AM Page 57 G Check of LEV (Expansion valve) Cooling does not operate. 1 During pressing OPERATION SELECT button on remote controller, press RESET button. 2 First, release RESET button. 1 During pressing OPERATION SELECT (Confirm all displays of remote controller.) button on remote controller, press 3 Then release OPERATION SELECT button. RESET button. 2 First, release RESET button.
OB271--2.qxp 2/7/01 9:04 AM Page 58 TEST POINT DIAGRAM AND VOLTAGE MS-18RV - E1 MS-24RV - E1 Indoor electronic control P.C. board } Fan motor power supply Fuse(F11) 250V AC 3.15A } Power supply input 220-240V AC + C144 -- C144 } 5V DC Room temperature thermistor(RT11) Indoor coil thermistor(RT12) Timer short mode point (JPS, JPG) (Refer to page 45.
OB271--2.qxp 2/7/01 9:04 AM Page 59 TEST POINT DIAGRAM AND VOLTAGE MS-30RV - E1 Indoor electronic control P.C. board } Fan motor power supply } Power supply input 220-240V AC + Fuse (F11) 250V AC 3.15A } 5V DC Room temperature thermistor(RT11) Indoor coil thermistor(RT12(main)) Indoor coil thermistor(RT13(sub)) PS132 Emergency operation switch Timer short mode point (JPS, JPG) (Refer to page 45.
OB271--2.qxp 2/7/01 9:04 AM Page 60 MU-30RV - E1 Outdoor deicer P.C. board Ambient temperature thermistor (RT63) 100 Discharge temperature thermistor(RT62) 900 Resistance(k") 800 700 600 Resistance(k") 90 80 70 60 50 40 500 400 30 300 20 200 10 100 0 0 10 20 30 40 50 60 70 80 90 100 110 120 Temperature(:) CN662 1-2 Discharge temperature thermistor (RT62) (Refer to page 57.) 0 -20 -10 0 10 20 30 40 Temperature(:) CN662 3-4 Ambient temperature thermistor (RT63) (Refer to page 57.
OB271--3.qxp 2/7/01 9:07 AM 12 Page 61 DISASSEMBLY INSTRUCTIONS <"Terminal with lock mechanism" Detaching points> In case of terminal with lock mechanism, detach the terminal as shown below. There are two types ( Refer to (1) and (2)) of the terminal with lock mechanism. The terminal with no lock mechanism can be removed by pulling it out. Check the shape of the terminal and work. (1) Slide the sleeve and check if there is a locking lever or not.
OB271--3.qxp 2/7/01 9:07 AM Page 62 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box Photo 3 Screw of the ground wire (1) (2) (3) (4) Remove the front panel. (Refer to 1) Remove the electrical cover. Disconnect the connector of the indoor coil thermistor. Disconnect the motor connector (CN211 and CN121) and the vane motor connector (CN151) on the electronic control P.C. board. (5) Remove the screw of the electrical box, remove the electrical box. Screws of the vane motor 4.
OB271--3.qxp 2/7/01 9:07 AM Page 63 12-2. MS-30RV - E1 INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the front panel (1) Remove the screws caps of the front panel. Remove the screws. (2) Pull the panel down to your side slightly and unhook the catches at the top. Photo 1 Front panel Screws 2. Removing the electronic control P.C. board, the receiver P.C. board and the display P.C. board (1) Remove the front panel. (Refer to 1) (2) Remove the screw of the electrical cover.
OB271--3.qxp 2/7/01 10:14 AM Page 64 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box (1) Remove the front panel. (Refer to 1) (2) Remove the electrical cover. (Refer to 2) (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. board. (5) Remove the screw of ground wire. (6) Remove the fan motor lead wire and indoor coil thermistor from the electrical box.
OB271--3.qxp 2/7/01 9:08 AM Page 65 12-3. MU-18RV - E1 MU-24RV - E1 OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet (1) Remove the screws of the cabinet. (2) Hold the bottom of the cabinet on the both side to remove the cabinet. Photo 1 Screws of the cabinet Service panel Photo 2 Screws of the cabinet 2. Removing the electrical parts Photo 3 (1) Remove the service panel and the cabinet. (2) Remove the following parts.
OB271--3.qxp 2/7/01 9:08 AM Page 66 OPERATING PROCEDURE PHOTOS 3. Removing the outdoor fan motor (1) Remove the cabinet. (Refer to 1) (2) Disconnect the connector remove the hooked lead wire from the fan motor. (3) Remove the propeller fan nut and remove the propeller fan. (4) Remove screws fixing the fan motor. Hook Photo 4 Connector Soundproof felt Propeller fan 4. Removing the compressor (1) (2) (3) (4) (5) (6) (7) (8) (9) Remove the cabinet. (Refer to 1) Remove the soundproof felt.
OB271--3.qxp 2/7/01 9:08 AM Page 67 12-4. MU-30RV - E1 OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet (1) Remove the screws of the top panel and the top panel. (2) Remove the screw of the service panel. To remove the service panel, pull it down toward you and unhook the catches on the both sides. (3) Remove the screw of the cover panel. To remove the cover panel. (4) Remove the screws of the cabinet. Open the cabinet to a 45-degree angle. Then lift it and unhook the catches to remove.
OB271--3.qxp 2/7/01 9:08 AM Page 68 OPERATING PROCEDURE PHOTOS 4. Removing the heat exchanger and compressor (1) Remove the screws of the rear panel. Remove the screws of the valve bed and the valve bed. (The valve bed is fixed by the catches on the right and left sides. Lift it to remove.) Open the rear panel to the rear to remove. NOTE : All panels are fixed by catches, and must be removed by up and down. (2) Remove the screws of the side panel and the side panel.
OB271--3.qxp 2/7/01 9:08 AM 13 Page 69 PARTS LIST MS-18RV - E1 (WH) MS-24RV - E1 (WH) 13-1. INDOOR UNIT STRUCTURAL PARTS 13-2. INDOOR UNIT HEAT EXCHANGER 1 2 8 3 4 Optional parts (See back cover.) 5 SCREW CAP 9 10 6 13-1. INDOOR UNIT STRUCTURAL PARTS Part numbers that is circled is not shown in the illustration. Symbol NO. Part No.
OB271--3.qxp 2/7/01 9:08 AM Page 70 MS-18RV - E1 (WH) MS-24RV - E1 (WH) 13-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS 13-4. ACCESSORY AND REMOTE CONTROLLER PART 21 13 16 1 2 22 SLEEVE BEARING 15 3 4 14 5 7 12 6 INDOOR COIL THERMISTOR 8 9 10 11 ROOM TEMPERATURE THERMISTOR 13-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Symbol NO. Part No.
OB271--3.qxp 2/7/01 9:08 AM Page 71 MU-18RV - E1 MU-24RV - E1 13-5. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 17 16 1 15 14 13 2 12 11 3 10 9 4 Part numbers that are circled are not shown in the illustration. Symbol NO. Part No.
OB271--3.qxp 2/7/01 9:08 AM Page 72 MS-30RV - E1 (WH) 13-6. INDOOR UNIT STRUCTURAL PARTS 13-7. INDOOR UNIT HEAT EXCHANGER 1 2 10 3 8 4 Optional parts (See back cover.) CATCH 5 SCREW CAP 11 12 6 7 13-6. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. NO. 1 2 3 4 5 6 7 8 9 Part No.
OB271--3.qxp 2/7/01 9:08 AM Page 73 MS-30RV - E1 (WH) 13-9. ACCESSORY AND REMOTE CONTROLLER PART 13-8. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS 1 20 19 23 24 2 3 SLEEVE BEARING 4 12 18 11 ROOM TEMPERATURE THERMISTOR 5 6 13 14 10 7 FUSE 8 9 VARISTOR 15 16 17 13-8. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Part No.
OB271--3.qxp 2/7/01 9:08 AM Page 74 MU-30RV - E1 13-10.
OB271--3.qxp 2/7/01 9:08 AM Page 75 MU-30RV - E1 13-10. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Part No.
OB271--3.qxp 14 2/7/01 9:08 AM Page 76 OPTIONAL PARTS 14-1. AIR CLEANING FILTER ● AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity. ● Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible. ● Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. ● DO NOT reuse AIR CLEANING FILTER even if it is washed.
