Service manual

ManualsBrandsMitsubishi ManualsAir ConditionerMCFZ-A18WV

SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ····································2

2. PART NAMES AND FUNCTIONS······················5

3. SPECIFICATION·················································5

4. NOISE CRITERIA CURVES·······························8

5. OUTLINES AND DIMENSIONS ·························9

6. WIRING DIAGRAM ··········································10

7. REFRIGERANT SYSTEM DIAGRAM··············12

8. PERFORMANCE CURVES······························14

9. ACTUATOR CONTROL····································29

10. TROUBLESHOOTING······································30

11. DISASSEMBLY INSTRUCTIONS·····················44

12. PARTS LIST······················································48

Wireless type

Models

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

MUZ-A18YV -

MUZ-A24YV -

MUZ-A26YV -

MUZ-A18YV -

MUZ-A24YV -

MUZ-A26YV -

Indication of

model name

HFC

utilized

R410A

Revision A:

● MUZ-A18YV - can be connected to

MCFZ-A18WV - .

● MUZ-A24YV - can be connected to

MCFZ-A24WV - .

No. OB346

REVISED EDITION-A

Please void OB346.

NOTE:

This service manual describes technical data of the outdoor units.

•As for indoor units MSZ-A18YV - , MSZ-A24YV - and MSZ-A26YV - , refer to the

service manual OB345.

•As for indoor units MCFZ-A18WV - and MCFZ-A24WV - , refer to the service manual

OB344 REVISED EDITION-A.

E1E1

E1E1E1

OB346A --1qxp 04.6.14 1:20 PM Page 1

Summary of content (52 pages)

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OB346A --1qxp 04.6.14 1:20 PM Page 1 Revision A: SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS ● MUZ-A18YV - E1 can be connected to MCFZ-A18WV - E1 . ● MUZ-A24YV - E1 can be connected to MCFZ-A24WV - E1 . Please void OB346. HFC utilized SERVICE MANUAL R410A No. OB346 Wireless type Models REVISED EDITION-A MUZ-A18YV MUZ-A24YV MUZ-A26YV - E1 E1 E1 CONTENTS Indication of model name MUZ-A18YV MUZ-A24YV MUZ-A26YV - E1 E1 E1 1. TECHNICAL CHANGES ····································2 2.
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OB346A --1qxp 1 04.6.14 1:20 PM Page 2 TECHNICAL CHANGES INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT • This room air conditioner adopts an HFC refrigerant (R410A) which never destroys the ozone layer. • Pay particular attention to the following points, though the basic installation procedure is same as that for R22 air conditioners. 1 As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/ materials are required.
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OB346A --1qxp 04.6.14 1:20 PM Page 3 Conversion chart of refrigerant temperature and pressure (MPa [Gauge]) 4.0 Saturated liquid pressure 3.5 R410A 3.0 R22 2.5 2.0 NOTE : The unit of pressure has been changed to MPa on the international system of units(SI unit system). 1.5 1.0 f [Gauge]) The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/f 0.5 0.0 -0.5 -30 -20 -10 0 10 20 30 40 50 60 (:) 1.
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OB346A --1qxp 04.6.14 1:20 PM Page 4 2 Flaring work and flare nut Flaring work for R410A pipe differs from that for R22 pipe. For details of flaring work, refer to Installation manual “FLARING WORK”. Dimension of flare nut Pipe diameter mm R410A R22 6.35 17 17 9.52 22 22 12.7 26 24 15.88 29 27 3.Refrigerant oil Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces. 4.
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OB346A --1qxp 04.6.14 1:20 PM 2 Page 5 PART NAMES AND FUNCTIONS MUZ-A18YV - E1 MUZ-A24YV - E1 MUZ-A26YV - E1 OUTDOOR UNIT ACCESSORIES Air inlet (back and side) MUZ-A18YV MUZ-A24YV MUZ-A26YV - Piping Drain hose 1 Drain socket 1 2 Drain cap [33 2 E1 E1 E1 Air outlet Drain outlet 3 SPECIFICATION Outdoor model Function Capacity Power supply Cooling Heating Single phase 230V,50Hz 5.0(0.9~5.9) 5.9(0.9~7.8) 2.5 — 2,940/1,650W 2,940/2,210W 20 6.62 1,500 98.5 7.38 1,670 98.4 7.38 6.32 7.
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OB346A --1qxp 04.6.14 1:20 PM Outdoor model Page 6 MUZ-A24YV - E1 Indoor model MSZ-A24YV - E1 MUZ-A24YV - E1 Indoor model MCFZ-A24WV - E1 MUZ-A26YV - E1 Indoor model MSZ-A26YV - E1 Cooling Cooling Heating Heating Cooling Heating Single phase Single phase Single phase Power supply 230V,50Hz 230V,50Hz 230V,50Hz Capacity Rated frequency(Min.~Max.) kW 6.0(0.9~6.7) 6.8(0.9~8.1) 5.5(0.9~6.1) 6.4(0.9~7.9) 7.1(0.9~8.3) 8.1(0.9~9.6) 3.1 3.8 — — Dehumidification 3.
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OB346A --1qxp 04.6.
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OB346A --1qxp 04.6.14 1:20 PM 4 Page 8 NOISE CRITERIA CURVES MUZ-A18YV - E1 MUZ-A24YV - E1 MUZ-A26YV - E1 SPEED FUNCTION SPL(dB(A)) COOLING 53 HEATING 55 LINE High OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.
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OB346A --1qxp 04.6.
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TAB2 BLU CT61 CN912 1 3 21S4 SYMBOL MC MF NF NR63 PFC R64 R934A, B RS1~4 RT61 RT62 NR63 TAB4 CN901 1 2 3 5 RT68 RT62 RT61 RED BLK 4 YLW BLK BLK 1 LEV 6 CN795 5 6 7 CN702 S R CN4 1 2 T801 1 2 CN701 RS2 RS1 SYMBOL NAME RT65 FIN TEMPERATURE THERMISTOR RT68 OUTDOOR HEAT EXCHANGER TEMPERATURE THERMISTOR SSR61 SOLENOID COIL RELAY T801 TRANSFORMER TB1 TERMINAL BLOCK TB2 TERMINAL BLOCK X64 RELAY 21S4 R.V.
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PE BLU CT61 CN912 1 3 21S4 SYMBOL MC MF NF NR63 PFC R64 R934A, B RS1~4 RT61 RT62 RT65 NR63 TAB4 CN901 1 2 3 5 RT62 RT61 CN661 1 2 3 4 1 2 3 5 CN781 YLW RED L RED BLK 4 YLW BLK BLK 1 S R CN4 1 2 T801 1 2 CN701 RS2 RS1 NAME OUTDOOR HEAT EXCHANGER RT68 TEMPERATURE THERMISTOR SSR61 SOLENOID COIL RELAY T801 TRANSFORMER TB1 TERMINAL BLOCK TB2 TERMINAL BLOCK X64 RELAY 21S4 R.V.
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OB346A --1qxp 7 04.6.14 1:20 PM Page 12 REFRIGERANT SYSTEM DIAGRAM MUZ-A18YV - E1 MUZ-A24YV - E1 OUTDOOR UNIT Unit:mm Refrigerant pipe [12.7 (MUZ-A18YV) Muffler (with heat insulator) [15.
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OB346A --1qxp 04.6.14 1:20 PM Page 13 MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Model Piping size O.D : mm Max. length : m Gas A MUZ-A18YV - E1 MUZ-A26YV - E1 Liquid Indoor unit 6.35 Gas 0.43 Gas 0 Liquid 0.5 Liquid 0 Outdoor unit 12.7 E1 MUZ-A24YV - Length of connecting pipe : m 30 15.88 9.52 MAX. HEIGHT DIFFERENCE Indoor unit w Max. Height difference 15m Refrigerant Piping Max.
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OB346A --1qxp 8 04.6.14 1:20 PM Page 14 PERFORMANCE CURVES MUZ-A18YV - E1 MUZ-A24YV - E1 MUZ-A26YV - 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. The following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
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Page 15 26.2 29.9 31.2 25.9 24.1 27.6 28.8 ure 23.7 22.1 25.3 26.4 19.8 21.6 20.1 23.0 24.0 17.8 19.4 18.1 20.7 21.6 15.8 17.2 16.1 18.4 19.2 13.8 15.1 14.1 16.1 16.8 11.9 12.9 12.1 13.8 14.4 ea tak In ) Outdoor intake air Wet-bulb temperature (:) MUZ-A18YV Indoor unit : MSZ-A18YV - E1 E1 ) ( Correction of Cooling total input 0 50 100 150 (Hz) E1 E1 ) ( 1.0 0.5 0 50 100 0.5 0 50 100 ) ( Correction of Cooling capacity 0 0.
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( 04.6.14 1:20 PM MUZ-A24YV - E1 Indoor unit : MCFZ-A24WV - E1 Page 16 ) ( Correction of Cooling capacity ) ( Correction of Cooling total input 0.5 0 50 100 1.0 0.5 150 (Hz) ) ( 0 50 100 0.5 0 50 100 MUZ-A26YV - E1 1.0 0.5 0 50 100 150 (Hz) 1.0 0.5 0 50 100 0.5 0 100 MUZ-A26YV - E1 150 (Hz) E1 Correction of Heating total input 1.5 1.0 0.5 0 150 (Hz) 50 The operational frequency of compressor Correction of Heating capacity 1.
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( Page 17 MUZ-A24YV Indoor unit : MSZ-A24YV - E1 E1 ) ( 14 1.4 25Hz 12 1.2 10 1.0 8 0.8 6 E1 E1 ) 0.6 ( MUZ-A24YV - E1 Indoor unit : MCFZ-A24YV - E1 ) ( (kgf/F [Gauge]) (MPa [Gauge]) 16 1.6 5 Outdoor unit current(A) Outdoor low pressure (kgf/F [Gauge]) (MPa [Gauge]) 16 1.6 MUZ-A24YV Indoor unit : MSZ-A24YV - 4 25Hz 3 2 14 1.4 12 1.2 10 1.0 8 0.8 6 0.6 MUZ-A24YV - E1 Indoor unit : MCFZ-A24YV - E1 ) 5 25Hz Outdoor unit current(A) 04.6.
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OB346A --1qxp 04.6.14 1:20 PM Page 18 PERFORMANCE DATA COOL operation Rated frequency 73Hz MSZ-A18YV - E1 : MUZ-A18YV - E1 CAPACITY:5.0(kW) SHF:0.65 INPUT:1560(W) 21 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT 21 18 5.88 2.76 0.47 1248 21 20 6.13 2.14 0.35 1310 22 18 5.88 3.00 0.51 1248 22 20 6.13 2.39 0.39 1310 22 22 6.38 1.72 0.27 1357 23 18 5.88 3.23 0.55 1248 23 20 6.13 2.63 0.43 1310 23 22 6.38 1.98 0.31 1357 24 18 5.88 3.47 0.59 1248 24 20 6.13 2.88 0.47 1310 24 22 6.38 2.23 0.35 1357 24 24 6.
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OB346A --1qxp 04.6.14 1:20 PM Page 19 PERFORMANCE DATA COOL operation Rated frequency 73Hz MSZ-A18YV - E1 : MUZ-A18YV - E1 CAPACITY : 5.0(kW) SHF : 0.65 INDOOR INDOOR DB(:) WB(:) 21 21 22 22 22 23 23 23 24 24 24 24 25 25 25 25 26 26 26 26 26 27 27 27 27 27 28 28 28 28 28 29 29 29 29 29 30 30 30 30 30 31 31 31 31 31 32 32 32 32 32 NOTE 18 20 18 20 22 18 20 22 18 20 22 24 18 20 22 24 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 Q 4.90 5.15 4.
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OB346A --1qxp 04.6.14 1:20 PM Page 20 PERFORMANCE DATA COOL operation Rated frequency 84Hz MCFZ-A18WV - E1 : MUZ-A18YV - E1 CAPACITY:4.8(kW) SHF:0.
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OB346A --1qxp 04.6.14 1:20 PM Page 21 PERFORMANCE DATA COOL operation Rated frequency 84Hz MCFZ-A18WV - E1 : MUZ-A18YV - E1 CAPACITY : 4.8(kW) SHF : 0.65 INPUT : 1830(W) OUTDOOR DB(:) INDOOR INDOOR 35 40 DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q 21 18 4.70 2.21 0.47 1793 4.32 2.03 0.47 1903 4.15 21 20 4.94 1.73 0.35 1867 4.61 1.61 0.35 1958 4.44 22 18 4.70 2.40 0.51 1793 4.32 2.20 0.51 1903 4.15 22 20 4.94 1.93 0.39 1867 4.61 1.80 0.39 1958 4.44 22 22 5.23 1.41 0.27 1940 4.90 1.32 0.27 2050 4.
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OB346A --1qxp 04.6.14 1:20 PM Page 22 PERFORMANCE DATA COOL operation Rated frequency 88Hz MSZ-A24YV - E1 : MUZ-A24YV - E1 CAPACITY:6.0(kW) SHF:0.64 INPUT:1990(W) OUTDOOR DB(:) 21 25 27 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF 21 18 7.05 3.24 0.46 1592 6.75 3.11 0.46 1672 6.48 2.98 0.46 21 20 7.35 2.50 0.34 1672 7.05 2.40 0.34 1771 6.84 2.33 0.34 22 18 7.05 3.53 0.50 1592 6.75 3.38 0.50 1672 6.48 3.24 0.50 22 20 7.35 2.79 0.38 1672 7.05 2.68 0.38 1771 6.84 2.60 0.
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OB346A --1qxp 04.6.14 1:20 PM Page 23 PERFORMANCE DATA COOL operation Rated frequency 88Hz MSZ-A24YV - E1 : MUZ-A24YV - E1 CAPACITY : 6.0(kW) SHF : 0.64 INDOOR INDOOR DB(:) WB(:) 21 21 22 22 22 23 23 23 24 24 24 24 25 25 25 25 26 26 26 26 26 27 27 27 27 27 28 28 28 28 28 29 29 29 29 29 30 30 30 30 30 31 31 31 31 31 32 32 32 32 32 NOTE 18 20 18 20 22 18 20 22 18 20 22 24 18 20 22 24 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 Q 5.88 6.18 5.
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OB346A --1qxp 04.6.14 1:20 PM Page 24 PERFORMANCE DATA COOL operation Rated frequency 102Hz MCFZ-A24WV - E1 : MUZ-A24YV - E1 CAPACITY:5.5(kW) SHF:0.65 INPUT:2420(W) OUTDOOR DB(:) 21 25 27 30 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 21 18 6.46 3.04 0.47 1936 6.19 2.91 0.47 2033 5.94 2.79 0.47 2130 5.72 2.69 0.47 2226 21 20 6.74 2.36 0.35 2033 6.46 2.26 0.35 2154 6.27 2.19 0.35 2202 6.05 2.12 0.35 2299 22 18 6.46 3.30 0.51 1936 6.19 3.16 0.51 2033 5.
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OB346A --1qxp 04.6.14 1:20 PM Page 25 PERFORMANCE DATA COOL operation Rated frequency 102Hz MCFZ-A24WV - E1 : MUZ-A24YV - E1 CAPACITY : 5.5(kW) SHF : 0.65 INDOOR INDOOR DB(:) WB(:) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 NOTE Q 5.39 5.67 5.
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OB346A --1qxp 04.6.14 1:20 PM Page 26 PERFORMANCE DATA COOL operation Rated frequency 63Hz MSZ-A26YV - E1 : MUZ-A26YV - E1 CAPACITY:7.1(kW) INPUT:2500(W) 21 Q SHC SHF INPUT 18 8.34 3.75 0.45 2000 20 8.70 2.87 0.33 2100 18 8.34 4.09 0.49 2000 20 8.70 3.22 0.37 2100 22 9.05 2.26 0.25 2175 18 8.34 4.42 0.53 2000 20 8.70 3.57 0.41 2100 22 9.05 2.63 0.29 2175 18 8.34 4.76 0.57 2000 20 8.70 3.91 0.45 2100 22 9.05 2.99 0.33 2175 24 9.51 2.00 0.21 2275 18 8.34 5.09 0.61 2000 20 8.70 4.26 0.49 2100 22 9.05 3.
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OB346A --1qxp 04.6.14 1:20 PM Page 27 PERFORMANCE DATA COOL operation Rated frequency 63Hz MSZ-A26YV - E1 : MUZ-A26YV - E1 CAPACITY : 7.1(kW) SHF : 0.63 INPUT : 2500(W) OUTDOOR DB(:) INDOOR INDOOR 35 40 DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q 21 18 6.96 3.13 0.45 2450 6.39 2.88 0.45 2600 6.14 21 20 7.31 2.41 0.33 2550 6.82 2.25 0.33 2675 6.57 22 18 6.96 3.41 0.49 2450 6.39 3.13 0.49 2600 6.14 22 20 7.31 2.71 0.37 2550 6.82 2.52 0.37 2675 6.57 22 22 7.74 1.93 0.25 2650 7.24 1.81 0.25 2800 6.
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OB346A --1qxp 04.6.14 1:20 PM Page 28 PERFORMANCE DATA HEAT operation MSZ-A18YV - E1 : MUZ-A18YV - E1 CAPACITY:5.9(kW) Rated frequency 82Hz INPUT:1730(W) OUTDOOR WB(:) INDOOR -10 -5 0 5 10 15 20 DB(:) Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT 15 3.72 1125 4.48 1349 5.25 1522 6.02 1644 6.79 1747 7.49 1799 8.26 1834 21 3.54 1211 4.25 1436 5.02 1592 5.72 1713 6.49 1799 7.20 1851 7.94 1920 26 3.19 1298 3.95 1522 4.66 1678 5.43 1799 6.20 1886 6.90 1938 7.
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OB346A --1qxp 04.6.14 1:20 PM 9 Page 29 ACTUATOR CONTROL MUZ-A18YV - E1 MUZ-A24YV - E1 MUZ-A26YV - E1 9-1. Outdoor fan motor control The fan motor turns ON/OFF, interlocking with the compressor. [ON] The fan motor turns ON 5 seconds before the compressor starts up. [OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running. 5 seconds 15 seconds ON Compressor OFF ON Outdoor fan OFF 9-2. R.V. coil control Heating . . . . . Cooling. . . . . . Dry . . . . . . . . .
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OB346A --1qxp 10 04.6.14 1:20 PM Page 30 TROUBLESHOOTING MUZ-A18YV - E1 MUZ-A24YV - E1 MUZ-A26YV - E1 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.
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OB346A --2qxp 04.6.14 1:20 PM Page 31 10-2. 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". Outdoor unit doesn't operate even in Test Run operation. Refer to E "Check of inverter/ compressor" on page 38. Indoor unit doesn't receive the signal from remote controller. Indoor unit operates. Outdoor unit doesn't operate normally.
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OB346A --2qxp 04.6.14 1:20 PM Page 32 1. Troubleshooting check table LED 1 (Red) Lighting LED 2 (Yellow) Lighting Error mode Normal Refer to page 35. Symptom: Outdoor unit does not operate.
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OB346A --2qxp 04.6.14 1:20 PM Page 33 Symptom: Outdoor unit operates (The compressor operates at reduced frequency) Indication LED 2 LED 1 (Red) (Yellow) Abnormal point Detecting method When the outdoor unit input current exceeds 14.5A. Once Lighting Current protection Twice Lighting High-pressure protection When the indoor gas pipe temperature exceeds 55˚C during heating.
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OB346A --2qxp 04.6.14 1:20 PM Page 34 2. Trouble criterion of main parts MUZ-A18YV - E1 MUZ-A24YV - E1 MUZ-A26YV - E1 Part name Check method and criterion Defrost thermistor/ Outdoor heat exchanger temperature thermistor Discharge temperature thermistor Measure the resistance using a tester. (Part temperature : -10°C ~ 40°C) Normal 5kΩ ~ 55kΩ abnormal Open or short-circuit Measure the resistance using a tester, after warming up the thermistor by holding by hand.
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OB346A --2qxp 04.6.14 1:20 PM Page 35 Outdoor unit does not operate. (LED display: display OFF) A Check of power supply Start Check the connecting of parts of main power supply circuit. Turn on power supply. Is there voltage of 230V AC in the power supply terminal block? No Check the power supply cable. Yes Is the output voltage from the noise filter P.C. board 230V AC? No Is fuse (F912) blown? No Yes Yes Is the input voltage to the power board 230V AC? Replace the fuse.
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OB346A --2qxp 04.6.14 1:20 PM Page 36 When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit does’t operate. (LED display: Both LED1 and LED2 lighting) B How to check mis-wiring and serial signal error (when outdoor unit does not work) Start • Turn ON the power supply (Indoor/ outdoor unit). • 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 the indoor unit.w Yes Make them sure.
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OB346A --2qxp 04.6.14 1:20 PM Page 37 The cooling operation or heating operation does not operate. (LED display: Both LED1 and LED2 lighting) C Check of R.V. coil • When heating operation does not work. Start 1. Disconnect the lead wire leading to the compressor. 2. 3 minutes after turning on the power supply, start EMERGENCY OPERATION in HEAT mode. Is there voltage of 230V AC between pin1 and pin 2 at connector CN912? No Yes Turn off power supply of indoor and outdoor unit.
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OB346A --2qxp 04.6.14 1:20 PM Page 38 • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit get warm. D Check of LEV LED display: LED1 Lighting 6 time Start LED2 Lighting Goes out Turn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely. Yes Is "click - click" sound heard? Or, do you feel vibration of the LEV coil with a hand? Normal No Yes Disconnect the connector CN795.
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OB346A --2qxp 04.6.14 1:20 PM Page 39 • When OPERATION INDICATOR lamp flashes 6-time. • When thermistor is abnormal. (When the LED display is a table below.) F Check of outdoor thermistors Start Disconnect the connector in the electronic control P.C. board (see below table), and measure the resistance of thermistor. Is the thermistor normal? Yes Replace the thermistor. No Reconnect the connector CN661 on the outdoor electronic control P.C.
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OB346A --2qxp 04.6.14 1:20 PM Page 40 • When the operation frequency does not go up from lowest frequency. H Check of HPS MUZ-A26YV Start 1. Disconnect the connector CN681 in the electronic control P.C. board. 2. Check the resistance of HPS after 1 minutes have passed since the outdoor unit power supply was turned off. Infinity Check the resistance between each terminal. Replace HPS. 0" Reconnect CN681. Turn on power supply to the indoor and outdoor unit.
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OB346A --2qxp 04.6.14 1:20 PM Page 41 MUZ-A18YV - E1 MUZ-A24YV - E1 MUZ-A26YV - E1 Defrost temperature thermistor (RT62) Fin temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) Outdoor electronic control P.C.
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OB346A --2qxp 04.6.14 1:20 PM Page 42 MUZ-A18YV - E1 MUZ-A24YV - E1 MUZ-A26YV - E1 Noise filter P.C. board CN901 Electronic control CN902 CN903 board Power board { { { CN912 R.V. coil 230V AC 230V AC 50Hz Input { 230V AC 50Hz Output F911 FUSE 1A/250V F912 FUSE 3.
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OB346A --2qxp 04.6.14 1:20 PM Page 43 MUZ-A18YV - E1 MUZ-A24YV - E1 MUZ-A26YV - E1 Power board Connect to the compressor Voltage among phases: 5V to 180V 325-370V DC Output (Red) (+) 1 (–) 3 (White) Connect to the earth ) Signal reception (From electronic control P.C. board) 5V DC pulse wave CN3 CN5 Fin temperature thermistor RT65 Primary current detection (Connect to the noise filter) CN2 Connect to the controller board (+)1-5(–): Signal transmission (To electronic control P.C.
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OB346A --2qxp 11 04.6.14 1:20 PM Page 44 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.
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OB346A --2qxp 04.6.14 1:20 PM Page 45 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board and power board (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel.(Refer to 1.) (3) Disconnect the following connectors; CN931 and CN932 (Fan motor) CN975 (LEV) CN661 (Discharge temperature thermistor, defrost thermistor and outdoor heat exchanger temperature thermistor)
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OB346A --2qxp 04.6.14 1:20 PM Page 46 OPERATING PROCEDURE PHOTOS 4. Removing the defrost thermistor, discharge temperature thermistor and outdoor heat exchanger tem perature thermistor Photo 5 Discharge temperature thermistor (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel. (Refer to 1.) (3) Remove the inverter assembly. (Refer to 2.) (4) Pull out the defrost thermistor from its holder.
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OB346A --2qxp 04.6.14 1:20 PM Page 47 OPERATING PROCEDURE PHOTOS 6. Removing the compressor and 4-way valve Photo 8 (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel. (Refer to 1.) (3) Remove the inverter assembly. (Refer to 2.) (4) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 kg/cm2 (0 MPa). (5) Detach the welded part of the suction and the discharge pipe connected with compressor.
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OB346A --2qxp 12 04.6.14 1:20 PM Page 48 PARTS LIST MUZ-A18YV - E1 MUZ-A24YV - E1 MUZ-A26YV - E1 12-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 26 30 29 28 27 25 24 1 23 2 22 3 21 4 5 6 20 7 18 17 16 8 14 15 19 10 11 9 12 13 These figures show about MUZ-A26YV.
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OB346A --2qxp 04.6.14 1:20 PM Page 49 MUZ-A18YV - E1 MUZ-A24YV - E1 MUZ-A26YV - E1 12-1. 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 33 34 Part No.
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OB346A --2qxp 04.6.14 1:20 PM Page 50 MUZ-A18YV - E1 MUZ-A24YV - E1 MUZ-A26YV - E1 12-2. ACCESSORY No. 1 2 Part No.
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OB346A --2qxp 04.6.
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OB346A --2qxp 04.6.14 1:20 PM Page 52 HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jun. 2004. No. OB346 REVISED EDITION - A 6 Distributed in Apr. 2004. No. OB346 6 Made in Japan New publication, effective Jun. 2004 Specifications subject to change without notice.