OB198--1.qxp 24/6/97 5:56 AM Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS No. OB198 SERVICE MANUAL Wireless type Models MSH09NW MSH12NN MSH15NN MSH17NN (WH) (WH) (WH) (WH) · · · · MUH09NW MUH12NN MUH15NN MUH17NN CONTENTS MSH12NN MSH15NN MSH17NN INDOOR UNIT Remote controller 1. FEATURES ·························································3 2. TECHNICAL CHANGE·······································4 3. PART NAMES AND FUNCTIONS······················4 4.
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OB198--1.qxp 24/6/97 5:56 AM 1 Page 3 FEATURES MSH12NN, MSH15NN Models LCD wireless remote controller MUH12NN, MUH15NN Cooling capacity Heating Capacity SEER HSPF MSH09NW 8,800Btu/h 10,500Btu/h 10.0 6.8 MSH12NN 12,900Btu/h 13,500Btu/h 10.2 6.8 MSH15NN 14,600Btu/h 14,800Btu/h 10.7 6.8 MSH17NN 16,200tu/h 17,200tu/h 10.3 6.
OB198--1.qxp 2 24/6/97 5:56 AM Page 4 TECHNICAL CHANGES MSH09EW ➔ MSH09NW 1. Indoor unit has changed. (Outline dimension changes. 31-1/8”o5-3/8”o14-3/16”(WoDoH)➔32-1/16”o7-3/16”o10-13/16”(WoDoH)) 2. Outdoor unit has changed. (Capillary tube and refrigerant had changed.) 3. Remote controller has changed. (The timer function was changed to the clock timer function.) 4. Indoor auto vane has been adopted. MSH12EN, MSH15EN ➔ MSH12NN, MSH15NN 1. Indoor unit has changed. (Outline dimension changes.
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OB198--1.qxp 24/6/97 5:56 AM 4 Page 6 SPECIFICATIONS ITEM MODELS ❈1 Cooling Heating 47 Heating 17 Cooling ❈1 Heating 47 Heating 17 Capacity Power consumption ❈1 ❈2 ❈1 Btu/h Btu/h Btu/h W W ❈2 EER ❈1 [SEER] HSPF 47 ❈1 [17˚] ❈2 COP INDOOR UNIT MODEL External finish V, phase, Hz Power supply A Max. fuse size (time delay) A Min. ampacity F.L.A Fan motor A(kW) Auxiliary heater CFM Dry Airflow Lo—Me—Hi CFM Wet Pints/h Moisture removal dB(A) Sound level Lo-Me-Hi in. Cond. drain connection O.D. in.
OB198--1.qxp 24/6/97 5:56 AM Page 7 ITEM MODELS ❈1 Cooling Heating 47 Heating 17 Cooling ❈1 Heating 47 Heating 17 Capacity Power consumption ❈1 ❈2 ❈1 Btu/h Btu/h Btu/h W W ❈2 EER ❈1 [SEER] HSPF 47 ❈1 [17˚] ❈2 COP INDOOR UNIT MODEL External finish V, phase, Hz Power supply A Max. fuse size (time delay) A Min. ampacity F.L.A Fan motor A(kW) Auxiliary heater CFM Dry Airflow Lo—Me—Hi CFM Wet Pints/h Moisture removal dB(A) Sound level Lo-Me-Hi in. Cond. drain connection O.D. in. W in. D Dimensions in.
OB198--1.qxp 24/6/97 5:56 AM Page 8 ITEM MODELS ❈1 Cooling Heating 47 Heating 17 Cooling ❈1 Heating 47 Heating 17 Capacity Power consumption ❈1 ❈2 ❈1 Btu/h Btu/h Btu/h W W ❈2 EER ❈1 [SEER] HSPF 47 ❈1 [17˚] ❈2 COP INDOOR UNIT MODEL External finish V, phase, Hz Power supply A Max. fuse size (time delay) A Min. ampacity F.L.A Fan motor A(kW) Auxiliary heater CFM Dry Airflow Lo—Me—Hi CFM Wet Pints/h Moisture removal dB(A) Sound level Lo-Me-Hi in. Cond. drain connection O.D. in. W in. D Dimensions in.
OB198--1.qxp 24/6/97 5:56 AM Page 9 MAX. REFRIGERANT PIPING LENGTH Model Additional piping Max. length : ft A Gas Length of connecting pipe : in. Liquid Indoor unit Outdoor unit [ 1/4 16-15/16 0 [ 3/8 MSH09NW MSH12NN MSH15NN MSH17NN Piping size O.D. : in. 49 [ 5/8 MAX.
OB198--1.qxp 24/6/97 5:56 AM Page 10 DATA 5 MSH09NW, MSH12NN, MSH15NN, MSH17NN 1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Models MSH09NW MSH12NN MSH15NN MSH17NN Outdoor intake air DB temperature(˚F) 75 85 95 105 115 IWB (˚F) TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC 71 10.8 6.1 0.79 10.1 5.7 0.87 9.5 5.4 0.94 8.8 5.0 0.98 8.1 4.6 1.02 67 10.2 7.1 0.75 9.5 6.7 0.82 8.8 6.2 0.89 8.2 5.7 0.94 7.5 5.3 0.99 63 9.6 8.0 0.71 8.
OB198--1.qxp 24/6/97 5:56 AM Page 11 2. PERFORMANCE CURVE NOTE : A point on the curve shows the reference point. MSH09NW MUH09NW Total power consumption (kW) Total capacity ( ✕10 Btu/h) Cooling capacity SHF at rating condition = 0.7 Airflow = 279CFM Bypass Factor = 0.23 12 Indo or in take air W B te 10 mpe ratu re (¡ F) 8 71 67 63 6 1.2 erature B temp air W r intake 0.8 (¡F) Indoo 71 67 63 0.
OB198--1.qxp 24/6/97 5:56 AM Page 12 NOTE : A point on the curve shows the reference point. MSH12NN MUH12NN Total power consumption (kW) Total capacity ( ✕10 Btu/h) Cooling capacity SHF at rating condition = 0.71 Airflow = 388CFM Bypass Factor = 0.
OB198--1.qxp 24/6/97 5:56 AM Page 13 NOTE : A point on the curve shows the reference point. MSH15NN MUH15NN Cooling capacity SHF at rating condition = 0.65 Airflow = 367CFM Bypass Factor = 0.
OB198--1.qxp 24/6/97 5:56 AM Page 14 NOTE : A point on the curve shows the reference point. MSH17NN MUH17NN Cooling capacity SHF at rating condition = 0.64 Airflow = 413CFM Bypass Factor = 0.
OB198--1.qxp 24/6/97 5:56 AM Page 15 3. Condensing presure MSH09NW(Cooling) Data is bassed on the condition of indoor humidity 50%. Air flow should be set at Hi. A point on the curve shows the reference point. (Psi.G) 300 280 86 F 80 75 70 240 (psi.
OB198--1.qxp 24/6/97 5:57 AM Page 16 MSH12NN(Cooling) Data is bassed on the condition of indoor humidity 50%. Air flow should be set at Hi. A point on the curve shows the reference point. (Psi.G) 320 300 86 F 80 75 70 280 (psi.
OB198--1.qxp 24/6/97 5:57 AM Page 17 MSH15NN(Cooling) Data is bassed on the condition of indoor humidity 50%. Air flow should be set at Hi. A point on the curve shows the reference point. (Psi.G) 320 300 86 F 80 75 70 280 (psi.
OB198--1.qxp 24/6/97 5:57 AM Page 18 MSH17NN(Cooling) Data is bassed on the condition of indoor humidity 50%. Air flow should be set at Hi. A point on the curve shows the reference point. (Psi.G) 320 300 86 F 80 75 70 280 (psi.
OB198--1.qxp 24/6/97 5:57 AM Page 19 4. STANDARD OPERATION Model MSH09NW Unit Cooling Heating Btu / h 8,800 10,500 SHF — 0.70 – Input kW Item Capacity Total 0.89 MSH09NW Indoor unit 115,1,60 Power supply (V, phase, Hz) kW 0.035 Fan current A 0.34 Aux. heater current A – Input Electrical circuit MUH09NW Outdoor unit 115, 1, 60 Power supply (V, phase, Hz) kW 0.855 Comp. current A 6.8 Fan current A 0.7 Input Condensing pressure psi.G 237 233 Suction pressure psi.
OB198--1.qxp 24/6/97 5:57 AM Page 20 MSH12NN Model Item Unit Cooling Heating Cooling Heating Btu / h 12,600/12,900 13,000/13,500 14,300/14,600 14,500/14,800 SHF — 0.71 – 0.65 – Input kW 1.28/1.31 1.18/1.25 1.35/1.38 1.25/1.30 Capacity Total Indoor unit MSH12NN MSH15NN Power supply (V, phase, Hz) 115, 1, 60 115, 1, 60 kW 0.047 0.047 Fan current A 0.41 0.41 Aux.
OB198--1.qxp 24/6/97 5:57 AM Page 21 Model MSH17NN Unit Cooling Heating Btu / h 16,000/16,200 16,800/17,200 SHF — 0.64 – Input kW 1.56/1.58 1.50/1.57 Item Capacity Total MSH17NN Indoor unit 115,1,60 Power supply (V, phase, Hz) kW 0.054 Fan current A 0.47 Aux. heater current A – Input Electrical circuit MUH17NN Outdoor unit 208/230, 1, 60 Power supply (V, phase, Hz) Input kW 1,506/1,526 1,446/1,516 A 6.69/6.19 6.39/6.09 Comp. current Fan current 0.
OB198--1.qxp 24/6/97 5:57 AM Page 22 5. OPERATING RANGE (1) POWER SUPPLY Indoor unit Outdoor unit Models Rating Guaranteed Voltage MSH09NW MSH12NN MSH15NN MSH17NN MUH09NW 115V 60Hz 1[ Min. 103V — Max. 127V MUH12NN MUH15NN MUH17NN 208/230V 60Hz 1[ Min. 198V — Max.
OB198--1.qxp 24/6/97 5:57 AM 6 Page 23 OUTLINES AND DIMENSIONS MSH09NW 8-7/8 Unit: inch 8-7/8 5-1/4 3-5/16 3/8 INDOOR UNIT 12-11/16 3-5/16 10-3/8 8-11/16 2-9/16 7-3/16 3/16 5-1/8 24-5/8 1/4-19-11/16 3/8-16-15/16 1-3/8 O.D. 3/4 I.D 1/4 3-15/16 10-13/16 32-1/16 2-3/8 3-11/16 12-3/8 1/8 1-13/16 1-5/8 7-3/8 7-3/16 30-13/16 2-13/16 5/8 1-1/8 3-9/16 11/16 6-5/16 2-3/16 OUTDOOR UNIT 4 in. MUH09NW 4 in . 4 in.
OB198--1.qxp 24/6/97 5:57 AM Page 24 MSH12NN, MSH15NN, MSH17NN INDOOR UNIT Unit: inch 7/16 ✕ 13/16 5-15/16 8-9/16 11-11/16 1/8 17-11/16 17-11/16 10-13/16 11-3/16 2-3/8 1-9/16 13/16 25-1/2 installation plate 13-7/8 17-1/4 2-15/16 39-15/16 7-1/2 3/16 12-5/8 5/16-19-11/16 1/2-16-15/16 1-15/16 O.D. 1-1/8 O.D. 1-15/16 7-1/2 30-1/2 5/8 11/16 1-1/8 6-5/16 2-3/16 13/16 13-9/16 11-7/16 12-3/16 4 in. 1-3/8 9-3/4 13-12/16 4 in. MUH12NN, MUH15NN OUTDOOR UNIT 20 14 i n. in.
5-7/16 Handle for moving 3-3/4 4 For 10 units or less Rear piping hole 1/2 Rear fresh air intake Side air intake 8 40 11-5/8 1 Air intake Outlet guide installation hole 20-5/18 1-9/16 Drain hole Handle for moving 1 2 34-1/4 Drain hole 1/2x7/8 Oval hoies (standard bolt W3/8(M10) 20-5/8 11-7/8 Air outlet 1/2 1/2 36 Service panel Ground terminal Handie for moving 2-3/8 1/2 R 4 1/ Bottom piping hole 2-9/16 4-3/4 2-3/8 (for N.E.
OB198--1.qxp 24/6/97 5:57 AM 7 Page 26 WIRING DIAGRAM MSH09NW INDOOR UNIT MODEL WIRING DIAGRAM TO OUTDOOR 3 TB ❈ ORN UNIT CONNECTING ❈ VLT WIRES 1 DC12V POWER SUPPLY 115V 1 phase 60Hz SR11 CN201 1 2 3 4 ❈ BLK N L1 RED NR11 CN 112 RT12 CN 111 RT11 3 2 1 C11 F11 CN 104 5 GROUND RECEIVER P.C.BOARD 1 2 3 4 MF 5 6 CN211 CN 151 5 BLK GRY YLW BRN WHT RED 3 CN 121 TRANS TAB12 LD101 ELECTRONIC CONTROL P.
24/6/97 5:57 AM Page 27 MSH12NN, MSH15NN, MSH17NN INDOOR UNIT MODEL WIRING DIAGRAM TB TO OUTDOOR 3 UNIT CONNECTING 1 WIRES DC12V N POWER SUPPLY 115V 1 phase 60Hz ❈ ORN CN201 ❈ BLK L1 CN 112 1 2 3 4 ❈ VLT HIC1 F11 TAB12 RED SR142 LDFM SR143 LDFVL DSAR SR141 CN 101 CN 104 CN 102 GRN/YLW GROUND 3 3 RECEIVER P.C.BOARD REMOTE CONTROLLER SYMBOL RT11 WHT ORN RED BLK YLW BLU BRN LDCOM LDC11 C11 LDC12 LDFH SR144 LDFL TRANS BRN RT12 CN 111 NR11 OB198--1.
OB198--1.qxp 8 24/6/97 5:57 AM Page 28 REFRIGERNT SYSTEM DIAGRAM Unit:inch MUH09NW MSH09NW INDOOR UNIT Indoor heat exchanger OUTDOOR UNIT Stop valve Refrigerant pipe [3/8 (with service (Option) port) (with heat insulator) Indoor coil thermistor RT12 Flared connection Muffler Strainer Reversing valve Service port Service port Outdoor heat exchanger Fusible plug Defrost thermisor RT61 Accumulator Room temperature thermistor RT11 Muffler Compressor Capillary tube O.D. 0.12✕I.D. 0.
OB198--1.qxp 24/6/97 5:57 AM Page 29 Unit:inch MSH17NN MUH17NN INDOOR UNIT OUTDOOR UNIT Refrigerant pipe [5/8 (Option) (with heat insulator) Indoor heat exchanger Indoor coil thermistor RT12 Distributor Flared connection Reversing valve Strainer Muffler Ball valve Service port Outdoor heat exchanger Service port Fusible plug Room temperature thermistor RT11 Strainer Defrost thermisor (RT61) Accumulator Muffler Compressor Distributor Flared connection Capillary tube O.D. 0.12✕I.D. 0.
OB198--1.qxp 9 24/6/97 5:57 AM Page 30 MICROPROCESSOR CONTROL Wireless remote controller MSH09NW, MSH12NN MSH15NN, MSH17NN Once the controls are set, the same operation mode can be repeated by simply turning the OPERATE/STOP button ON. Indoor unit receives the signal with a beep tone. When the system turned off, 3-minute time delay will operate to protect system from overload and compressor will not restart for 3 minutes. 9-1.
OB198--1.qxp 24/6/97 5:57 AM Page 31 (4) The initial set temperature is decided by the initial room temperature.
OB198--1.qxp 24/6/97 5:57 AM Page 32 — COOL mode of “I FEEL CONTROL” — ON ON Compressor and outdoor fan motor OFF Indoor fan motor ON OFF Run continuously in cooling mode NOTE : Coil frost prevention during COOL mode of “I FEEL CONTROL” There are two types of controls in coil frost prevention. ① Temperature control When the indoor coil thermistor RT12 reads 39˚F or below for 5 minutes, the coil frost prevention mode starts.
OB198--2.qxp 24/6/97 6:01 AM Page 33 Operation time chart Example ON 1st ON OFF Thermostat Indoor fan OFF ON Outdoor fan compressor ON ON ON OFF ON OFF ON OFF 1 min. 3 min. 8 min. 4 min. NOTE ● Coil frost prevention during DRY mode of “I FEEL CONTROL” The operation is as same as that of coil frost prevention during COOL mode of “I FEEL CONTROL”. However the indoor fan speed becomes the set speed or Lo. — HEAT mode of “I FEEL CONTROL” — 1.
OB198--2.qxp 24/6/97 6:01 AM Page 34 2. High pressure protection During heating operation, the outdoor fan motor is controlled by the indoor coil thermistor RT12 temperature for excess rise protection of compressor discharge pressure. Outdoor fan OFF : 126˚F (MSH09), 122˚F (MSH12/15/17) Outdoor fan ON : 118.
OB198--2.qxp 24/6/97 6:01 AM Page 35 (3) Defrost time chart Defrost thermistor 38˚F or more RT61 27˚F or less Outdoor 52C relay(Compressor) ON OFF X62 ON (Solenoid coil) OFF SR61 Outdoor fan 15 sec. 30 sec. 30 sec. 15 sec. ON OFF Defrost counter Indoor fan ON OFF ON Max 10 min. ❈ VLo OFF Indoor vane Horizontal set position NOTE ● When the indoor coil thermistor reads above 64˚F, indoor fan operates at VLo for 30 seconds.
OB198--2.qxp 24/6/97 6:01 AM Page 36 4. Reversing valve control Heating · · · · · ON Cooling · · · · · OFF Dry · · · · · · · · OFF NOTE: The Reversing valve reverses for 5 seconds right before start-up of the compressor. (HEAT) (COOL / DRY) 5 sec. 5 sec. Compressor Reversing valve Outdoor fan ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF 9-2. COOL OPERATION (1) Press OPERATE/STOP button. OPERATION INDICATOR of the indoor unit turns on with a beep tone. (2) Select COOL mode.
OB198--2.qxp 24/6/97 6:01 AM Page 37 9-5. FAN MOTOR CONTROL (MSH09 only) (1) Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feedback the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (Hi,Me,Lo) the microprocessor controls SR11 and adjusts fan motor electric current to make the current rotational frequency close to the target rotational frequency.
OB198--2.qxp 24/6/97 6:01 AM Page 38 (3) Positioning The vane is once pressed to the vane stopper below to confirm the standard position and then set to the desired angle. The positioning is decided as follows. (a) When the OPERATE/STOP button is pressed. (POWER ON/OFF) (b) When the vane control change AUTO to MANUAL. (c) When the SWING is finished. (d) When the test run starts. (e) When the power supply turns ON.
OB198--2.qxp 24/6/97 6:01 AM Page 39 9-7. TIMER OPERATION 1. How to set the timer. (1) Press OPERATE/STOP button to start the air conditioner. (2) Check that the current time is set correctly. NOTE : Timer operation will not work without setting the current time. Initially “AM0:00” blinks at the current time display of TIMER MONITOR so set the current time, correctly with CLOCK SET button. (3) Press TIMER CONTROL button to select the operation. “ START” button...
OB198--2.qxp 24/6/97 6:01 AM Page 40 9-8. EMERGENCY-TEST OPERATION When the remote controller is missing, has failed or the batteries run down, press the EMERGENCY OPERATION switch on the front of the indoor unit. The unit will start and the POWER MONITOR lamp will light. The first 30 minutes of operation will be the test run operation. This operation is for servicing. The indoor fan runs at high speed and the system is in continuous operation. The thermostat is ON and the timer is reset to normal.
OB198--2.qxp 24/6/97 6:01 AM 10 Page 41 SERVICE FUNCTIONS MSH09NW, MSH12NN, MSH15NN, MSH17NN 1. COMPULSORY DEFROSTING MODE FOR SERVICE By short circuit of the connector JP607 and R853 on the outdoor deicer P.C. board, defrosting mode can be accomplished regardless of the defrost interval restriction. See Page 53. Defrost thermistor RT61 must read below 27°F 2. DEFROST TERMINATION CHANGE when the JPC wire of the deicer P.C. board is cut, the defrost interval time will be changed.
OB198--2.qxp 24/6/97 6:01 AM Page 42 5. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION A maximum of 4 indoor units with wireless remote controllers can be used in a room. In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be modified according to the indoor unit number. How to modify the remote controller P.C. board Remove batteries before modification.
OB198--2.qxp 24/6/97 6:01 AM 11 Page 43 TROUBLESHOOTING MSH09NW, MSH12NN, MSH15NN, MSH17NN 11-1 Cautions on troubleshooting 11-1-1 Before troubleshooting, check the followings: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for mis-wiring. 11-1-2 Take care the followings during servicing. 1) Be sure to unplug the power cord before removing the front panel, the cabinet, the top panel, and the P.C. boards. 2) When removing the P.C.
OB198--2.qxp 24/6/97 6:02 AM Page 44 11-2 Instruction of troubleshooting Start Indoor unit operates. Outdoor unit doesn’t operate. Indoor unit dosen’t receive the signal from remote controller. Indoor unit operation monitor lamp is flashing. 2-time flash Outdoor unit operates in only Test Run operation. Outdoor unit doesn’t operate even in Test Run operation. Refer to B ”Check of receiver P.C. board” on page 48. Indoor unit doesn’t receive the signal from remote controller.
OB198--2.qxp 24/6/97 6:02 AM Page 45 11-2-1 troubleshooting check table Look at the left lamp flash for the self check table. ❈ Before taking measures, make sure that the symptom reappears, for accurate troubleshooting. Self check table NO. Abnormal point Indication Symptom Detect method Check point 1-second ON Mis-wiring 1-second OFF Outdoor unit does not run. 1 1-second ON Serial signal When serial signal stops for 4 to 5 seconds after 1st on of 52C relay by POWER turning on.
OB198--2.qxp 24/6/97 6:02 AM Page 46 MSH09NW, MSH12NN, MSH15NN, MSH17NN 11-2-2 Trouble criterion of main parts Figure Check method and criterion Part name Room temperature thermistor Measure the resistance with a tester. (Part temperature 50°F ~ 86°F) Normal Indoor coil thermistor Abnormal Opened or short-circuited 8kΩ ~ 20kΩ Measure the resistance with a tester.
OB198--2.qxp 24/6/97 6:02 AM Page 47 A Check of indoor fan motor Inodoor fan does not operate. Turn OFF power supply. Check connector (Fan motor) visually. No No Are lead wires connected? Is soldered point normal? Yes Yes Reconnect the lead wires. Resolder it. Disconnect lead wires from connector (Fan motor) on indoor electronic control P.C. board. Measure resistance between lead wires No.1 and No.3 and then No.2 and No.3 (09NW). No.1 and No.4 and then No.3 and No.4 (12/15/17NN).
OB198--2.qxp 24/6/97 6:02 AM Page 48 B Check of receiver P.C. board Indoor unit operates by pressing the emergency ON/OFF switch, but does not operate with the remote controller. Check the model name of remote controller. Is LCD display on remote controller visible? No Replace batteries.(see page 43.) (not clear) Yes Remove batteries and then set them back. Check if the unit operates with remote controller.
OB198--2.qxp 24/6/97 6:02 AM Page 49 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. Replace the fuse. Trouble of indoor electronic control P.C. board. Yes Yes No Is fuse(F11)blown? Check both “parts side”and “pattern side of indoor electronic control P.C. board visually. 1.Pull out power supply cord. 2.
OB198--2.qxp 24/6/97 6:02 AM Page 50 E How to check mis-wiring and serial signal error (when outdoor unit does not work) Start Turn off power supply. (indoor/outdoor units) Turn on power supply. (indoor/outdoor units) Rectify voltage. When 230V is available for MSH09NW outdoor unit,replace the outdoor P.C. board. No Power voltage of terminal blocks of indoor/outdoor units is normal. Yes Turn on Emergency operation switch. Normal operation starts 3 minutes after power supply is turned on.
OB198--2.qxp 24/6/97 6:02 AM Page 51 TEST POINT DIAGRAM AND VOLTAGE MSH09NW Indoor electronic control P.C. board CN201 No.1 } CN201 No.1 Power supply input AC115V Varistor(NR11) Fuse AC250V 3.
OB198--2.qxp 24/6/97 6:03 AM Page 52 TEST POINT DIAGRAM AND VOLTAGE MSH12NN, MSH15NN, MSH17NN Indoor electronic control P.C. board Fan motor power supply VLo Me Lo Hi 8 7 5 6 4 3 2 1 Varistor(NR11) Fuse AC250V 3.
OB198--2.qxp 24/6/97 6:03 AM Page 53 MUH09NW MUH12NN MUH15NN MUH17NN -4 14 32 50 68 86 104 ˚F Outdoor fan motor Solenoid coil -- INPUT AC115V(MUH09) AC208/230V(MUH12/15/17) } + } } AC115V(MUH09) AC115V(MUH09) AC208/230V(MUH12/15/17) AC208/230V(MUH12/15/17) Defrost thermistor(RT61) } } R601 DC5~10V DEICER P.C. BOARD Fuse 2A/250V Defrost interval time short pin + } -- -- + + -- } } DC12V 52C DC12V J8 J7 DC5V Defrost termination temperature change. Jumper wire JPC and JPE.
OB198--2.qxp 24/6/97 6:03 AM Page 54 RELAY OPERATION MSH09NW MSH12NN MSH15NN MSH17NN MODE COOL & COOL mode of I FEEL CONTROL DRY & DRY mode of I FEEL CONTROL HEAT & HEAT mode of I FEEL CONTROL THERMOSTAT 52C CONTACTOR ON ON OFF OFF INDOOR FAN RELAY AUTO or set speed OFF for 2 min.after system ON Repeats 8 min. ON/3min. OFF operation or 2 min. ON/3 min. OFF operation AUTO or set AUTO or set speed links with 52C contactor. OFF Repeates 4 min. OFF/1 min.
OB198--2.qxp 24/6/97 6:03 AM 12 Page 55 DISASSEMBLY INSTRUCTIONS NOTE: ❈ On the wiring diagram shows the terminals with a lock mechanism, so it cannot be removed when you pull the lead wire. Be sure to pull the wire by pushing the locking lever (projected part) of the terminal with a finger. ① Slide the sleeve. ➁ Pull the wire while pushing the locking lever. 12-1 MSH09NW INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the front panel (1) Remove the screws caps of the front panel.
OB198--2.qxp 24/6/97 6:04 AM Page 56 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box (1) Remove the front panel. (Refer to 1) (2) Remove the electrical cover. (3) Remove the electronic control P.C. board and the display P.C. board.(Refer to 2) (4) Remove the ground wire of the indoor heat exchanger. (5) Unhook the catches (both upper and lower), remove the electrical box. 4. Removing the vane motor (1) Remove the front panel. (2) Remove the screw of the vane motor, disconnect the connector.
OB198--2.qxp 24/6/97 6:04 AM Page 57 12-2 MSH12NN , MSH15NN, MSH17NN 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 (1) Remove the front panel. (Refer to 1) (2) Remove the screw of the electrical cover. Remove the electrical cover. (3) Remove the terminal cover.
OB198--2.qxp 24/6/97 6:04 AM Page 58 OPERATING PROCEDURE PHOTOS 3. Removing the indoor fan motor and the line flow fan (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 con trol P.C. board. Remove the ground wire of the indoor heat exchanger.
OB198--2.qxp 24/6/97 6:05 AM Page 59 12-3 MUH09NW OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet (1) (2) (3) (4) Remove Remove Remove Remove insides. (5) Remove (6) Remove screws securing the top panel. the screw securing the service panel. screws securing the cabinet. the service panel,and remove the screw from the the top panel. the cabinet. Photo 1 Screw for service panel Service panel Screw for top plate Screws for cabinet Photo 2 Screw for top plate Screw for cabinet 2.
OB198--2.qxp 24/6/97 6:05 AM Page 60 OPERATING PROCEDURE 3. Removing the compressor (1) (2) (3) (4) (5) (6) (7) (8) Remove the lead clamps. Remove the screws securing the relay panel. Remove the screw securing the service port. Remove the terminal cover. Pull out the lead from the compressor terminal. Remove the overcurrent relay. Remove the compressor nuts. Detach the suction pipe welded section and discharge pipe welded section with a burner.
OB198--2.qxp 24/6/97 6:05 AM Page 61 12-4 MUH12NN , MUH15NN OUTDOOR UNIT OPERATING PROCEDURE 1. Removing the cabinet PHOTOS 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 Screw Screws Screw 2. Removing the electrical parts (1) Remove the service panel and the cabinet. (2) Remove the following parts.
OB198--2.qxp 24/6/97 6:06 AM Page 62 OPERATING PROCEDURE 3. Removing the outdoor fan motor (1) Remove the cabinet. (Refer to 1) (2) Disconnect the connector and remove the clamp of fan motor lead wire. (3) Remove the propeller fan nut and remove the propeller fan. (4) Remove screws securing the fan motor. PHOTOS Photo 4 Clamp Propeller fan 4. Removing the compressor (1) Remove the cabinet.
OB198--2.qxp 24/6/97 6:06 AM Page 63 12-5 MUH17NN OUTDOOR UNIT OPERATING PROCEDURE 1. Removing the cabinet and electrical parts (1) Remove the top panel (3 screws in front, 2 screws in rear) (2) Remove the cover panel (1 screw). The panel is anchored by clicks to the side panel. Remove by pulling towards you. (3) Remove the cover panel (1 screw). The panel is anchored by clicks on the right and left sides. After removing the screw, pull the panel down and remove it by pulling towards you.
OB198--2.qxp 24/6/97 6:06 AM Page 64 OPERATING PROCEDURE 3. Removing the heat exchanger and compressor (1) Remove the rear panel (2 screws in front, 1 screw on the side, 3 screws in the rear). Remove the valve bed, and open the rear panel to the rear to remove. NOTE : All panels are clasped, and must be removed by shifting up and down. (2) (3) (4) (5) (6) Remove the right side panel (4 screws). Remove the rear guard (3 screws). Remove the separator support plate (4 screws).
OB198--3.qxp 24/6/97 6:25 AM 13 Page 65 PARTS LIST INDOOR UNIT STRUCTURAL PARTS MSH09NW (WH) 5 1 4 6 Optional parts (See page 74.) 2 3 NO. Part No. Part Name Symbol Q'ty/unit in Wiring MSH09NW (WH) Diagram 1 E02 289 000 FRONT PANEL(WH) 1 2 E02 151 010 GRILL(WH) 1 3 E02 164 100 AIR FILTER 2 4 E02 166 234 BOX(WH) 1 5 E02 151 970 INSTALLATION PLATE 1 6 E02 166 067 SCREW CAP(WH) 2 3 Part No. 1PC/SET 2PCS/SET 1 INDOOR UNIT HEAT EXCHANGER MSH09NW (WH) NO.
OB198--3.qxp 24/6/97 6:26 AM Page 66 INDOOR UNIT ELECTRICAL PARTS MSH09NW(WH) 7 8 9 15 3 10 6 5 1 4 2 12 Part number that are circled is not shown in the illustration. NO. Part No.
OB198--3.qxp 24/6/97 6:27 AM Page 67 OUTDOOR UNIT STRUCTURAL PARTS MUH09NW 5 11 2 14 1 9 10 7 8 4 6 3 Part number that are circled is not shown in the illustration. Symbol NO. Part No.
OB198--3.qxp 24/6/97 6:27 AM Page 68 OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS MUH09NW 1 5 6 4 2 3 Part number that are circled is not shown in the illustration. Symbol NO. Part No. Part Name in Wiring Diagram 1 2 3 4 5 MUH09NW E02 085 501 PROPELLER FAN E02 289 301 OUTDOOR FAN MOTOR MF 1 E02 289 353 COMPRESSOR CAPACITOR E02 289 374 TERMINAL BLOCK C1 1 TB 1 1 Remarks 1 E02 289 310 DEFROST THERMISTOR E02 289 451 DEICER P.C.
OB198--3.qxp 24/6/97 6:28 AM Page 69 INDOOR UNIT STRUCTURAL PARTS MSH12NN (WH) 1 MSH15NN (WH) MSH17NN (WH) 5 3 2 Optional parts (See page 74.) 6 4 Part number that are circled is not shown in the illustration. Symbol NO. Part No.
OB198--3.qxp 24/6/97 6:28 AM Page 70 INDOOR UNIT ELECTRICAL PARTS MSH12NN (WH) MSH15NN (WH) MSH17NN (WH) 12 11 15 9 7 5 4 5 3 16 13 17 2 1 10 14 Part number that are circled is not shown in the illustration. Symbol NO. Part No.
OB198--3.qxp 24/6/97 6:29 AM Page 71 OUTDOOR UNIT STRUCTURAL PARTS MUH12NN MUH15NN 17 18 19 12 1 8 10 4 21 15 9 16 5 2 14 6 3 7 Part number that are circled is 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 Part No.
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OB198--3.qxp 24/6/97 6:30 AM Page 73 OUTDOOR UNIT STRUCTURAL PARTS MUH17NN NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Part No.
OB198--3.qxp 24/6/97 6:30 AM 14 Page 74 OPTIONAL PARTS 1. REFRIGERANT PIPES The air conditioner has flared connections its on indoor and outdoor sides. Please use the optional extension pipe as follows. Applicable Model MSH09NW MSH12NN Part No. Pipe length MAC - 440PI 10ft , Cross-section MAC - 441PI 16ft MAC - 442PI 23ft MAC - 443PI 33ft MAC - 670PI 10ft MAC - 671PI 16ft MSH15NN MAC - 672PI 23ft MSH17NN MAC - 673PI 33ft MAC - 674PI 49ft Pipe size O.D A-Gas(in.
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OB198--3.qxp 24/6/97 6:30 AM Page 76 C Copyright 1997 MITSUBISHI ELECTRIC ENGINIEERING CO.,LTD Issued in Jul. 1997. No.OB198 5042 New publication, effective Jul. 1997 Specifications subject to change without notice.
3400 Lawrenceville Suwanee Road ● Suwanee, Georgia 30024 Toll Free: 800-433-4822 ● Toll Free Fax: 800-889-9904 www.mrslim.com Specifications are subject to change without notice.
