Mitsubishi Electric MUCFH-A18WV-E1 Service Manual
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Mitsubishi Electric MUCFH-A18WV-E1 Service Manual

Mitsubishi Electric MUCFH-A18WV-E1 Service Manual

Wireless type models, hfc utilized r410a
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FLOOR AND CEILING TYPE AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Models
MUCFH-A18WV -
MUCFH-A24WV -
NOTE:
•This service manual describes technical data of outdoor units.
As for indoor units MCFH-A18WV-
service manual OB336.
Indication of model name
MUCFH-A18WV -
E1
and MCFH-A24WV-
E1
Revision B:
Part number of 4-WAY VALVE has been
corrected.
Please void OB337 REVISED EDITION-A.
HFC
utilized
R410A
E1
E1
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················5
3. SPECIFICATION·················································5
4. NOISE CRITERIA CURVES ·······························6
5. OUTLINES AND DIMENSIONS ·························7
6. WIRING DIAGRAM ············································8
7. REFRIGERANT SYSTEM DIAGRAM ················9
8. PERFORMANCE CURVES ······························10
9. ACTUATOR CONTROL····································18
10. SERVICE FUNCTIONS·····································18
11. TROUBLESHOOTING ······································19
12. DISASSEMBLY INSTRUCTIONS·····················29
13. PARTS LIST······················································33
, refer to the
E1
No. OB337
REVISED EDITION-B

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  • Page 1: Table Of Contents

    Revision B: Part number of 4-WAY VALVE has been corrected. FLOOR AND CEILING TYPE AIR CONDITIONERS Please void OB337 REVISED EDITION-A. No. OB337 REVISED EDITION-B utilized R410A SERVICE MANUAL Wireless type Models MUCFH-A18WV - MUCFH-A24WV - CONTENTS 1. TECHNICAL CHANGES ····································2 2.

  • Page 2: Technical Changes

    Revision A: •Power input of SPECIFICATION has been modified. Revision B: •Part number of 4-WAY VALVE has been corrected. Part Number Part Name Model Revise point Incorrect Correct MUCFH-A18WV - 13-1. No.13 4-WAY VALVE E02 679 961 E02 891 961 MUCFH-A24WV - 13-3.
  • Page 3 New Specification Current Specification The incompatible refrigerating oil easily separates from Since refrigerant and refrigerating oil are compatible each, refrigerant and is in the upper layer inside the suction muffler. refrigerating oil backs to the compressor through the lower Raising position of the oil back hole enables to back the position oil back hole.
  • Page 4 2.Refrigerant piping 1 Specifications Use the refrigerant pipes that meet the following specifications. Outside diameter Wall Pipe Insulation material thickness 0.8 mm 6.35 For liquid Heat resisting foam plastic 9.52 0.8 mm Specific gravity 0.045 Thickness 8 mm 12.7 0.8 mm For gas 15.88 1.0 mm...

  • Page 5: Part Names And Functions

    PART NAMES AND FUNCTIONS OUTDOOR UNIT MUCFH-A18WV - MUCFH-A24WV - Air inlet Air inlet (back and side) Piping Drain hose Air outlet Air outlet Drain outlet ACCESSORIES Q'ty Item MUCFH-A18WV- MUCFH-A24WV- Drain socket Drain cap [33 Drain cap [16 – SPECIFICATION Outdoor model MUCFH-A18WV -...

  • Page 6: Noise Criteria Curves

    NOISE CRITERIA CURVES MUCFH-A18WV - MUCFH-A24WV - FAN SPEED SPL(dB LINE FAN SPEED SPL(dB LINE High High Test conditions, Test conditions, Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:) Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:) Heating : Dry-bulb temperature 7: Wet-bulb temperature Heating : Dry-bulb temperature 7: Wet-bulb temperature NC-70 NC-70...

  • Page 7: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: mm OUTDOOR UNIT MUCFH-A18WV - REQUIRED SPACE Drainage hole [16.2 Air in Air in Drainage Air out 3holes [33 Service panel Liquid refrigerant pipe joint Refregerant pipe (flared) [6.35 Gas refregerant pipe joint Refregerant pipe (flared) [12.7 Open as a rule 500mm or more if MUCFH-A24WV -...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM MUCFH-A18WV - MODEL WIRING DIAGRAM OUTDOOR UNIT 21S4 RT61 CN721 CN661 2 3 4 INDOOR UNIT CN711 CONNECTING CIRCUIT BREAKER SR61 POWER SUPPLY ~ /N TAB20 230V 50Hz DEICER P.C.BOARD SYMBOL NAME SYMBOL NAME SYMBOL NAME COMPRESSOR CAPACITOR OUTDOOR FAN MOTOR (INNER PROTECTOR) TERMINAL BLOCK TB1,TB2...

  • Page 9: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MUCFH-A18WV - Unit:mm OUTDOOR UNIT Refrigerant pipe [12.7 4- way valve (with heat insulator) Oil separator Stop valve #100 (with service port) Outdoor heat Defrost Flared connection exchanger thermistor RT61 Capillary tube [2.5o[0.6o1,000 Compressor Capillary tube [3.0o[1.6o750 Flared connection (2 pcs) Capillary tube...

  • Page 10: Performance Curves

    MAX. REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE Refrigerant piping Piping size O.D. : mm Model MAX. length :mm Liquid {12.7 MUCFH-A18WV - {6.35 {15.88 MUCFH-A24WV - wIt does not matter which unit is higher. A: Refrigerant piping Max.length 25m ADDITIONAL REFRIGERANT CHARGE (R410A : g) If pipe length exceeds 7m, additional refrigerant (R410A) charge is required.
  • Page 11 How to measure the indoor air wet-bulb/dry-bulb temperature difference 1. Attach at least 2 sets of wet and dry-bulb thermometers to the indoor air inlet as shown in the figure, and at least 2 sets of wet and dry bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed is high.
  • Page 12 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). The conversion factor is : 1(MPa [Gauge]) =10.2(kgf/f f [Gauge]) MUCFH-A18WV- (kgf/F [Gauge]) (MPa [Gauge]) 230V 230V 18 20...
  • Page 13 PERFORMANCE DATA COOL operation(230V) MCFH-A18WV - : MUCFH-A18WV - CAPACITY :4.8(KW) SHF :0.65 INPUT :1810(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 5.64 2.65 0.47 1448 5.40 2.54 0.47 1520 5.18 2.44 0.47 1593...
  • Page 14 PERFORMANCE DATA COOL operation(230V) MCFH-A18WV - : MUCFH-A18WV - CAPACITY :4.8(KW) SHF :0.65 INPUT :1810(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.70 2.21 0.47 1774 4.32 2.03 0.47 1882 4.15 1.95 0.47 1919 4.94 1.73 0.35 1846...
  • Page 15 PERFORMANCE DATA COOL operation(230V) MCFH-A24WV - : MUCFH-A24WV - CAPACITY :6.0(KW) SHF :0.64 INPUT :2450(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 7.05 3.24 0.46 1960 6.75 3.11 0.46 2058 6.48 2.98 0.46 2156...
  • Page 16 PERFORMANCE DATA COOL operation(230V) MCFH-A24WV - : MUCFH-A24WV - CAPACITY :6.0(KW) SHF :0.64 INPUT :2450(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 5.88 2.70 0.46 2401 5.40 2.48 0.46 2548 5.19 2.39 0.46 2597 6.18 2.10 0.34 2499...
  • Page 17 PERFORMANCE DATA HEAT operation(230V) MCFH-A18WV - : MUCFH-A18WV - CAPACITY :5.0(KW) INPUT :1890(W) OUTDOOR WB(:) INDOOR DB(:) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 3.15 1229 3.80 1474 4.45 1663 5.10 1796 5.75 1909 6.35 1966 7.00 2003 3.00 1323 3.60 1569 4.25...

  • Page 18: Actuator Control

    ACTUATOR CONTROL MUCFH-A18WV - MUCFH-A24WV - R.V. coil control Heating · · · · · ON Cooling · · · · · OFF Dry · · · · · · · · OFF NOTE. : The 4-way valve reverses for 5 seconds right before start-up of the compressor. (HEAT) (COOL / DRY) Example.

  • Page 19: Troubleshooting

    TROUBLESHOOTING MUCFH-A18WV - MUCFH-A24WV - 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 service. (1) Before servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, and then after confirming the horizontal vane has completely closed, turn off the breaker.
  • Page 20 11-2. Instruction of troubleshooting Start Indoor unit Indoor unit Indoor unit operates. operates. OPERATION INDICATOR doesn't receive Outdoor unit Outdoor unit lamp on the indoor unit is the signal from doesn't doesn't operate flashing on and off. remote controller. operate. normally.
  • Page 21 11-3. Trouble criterion of main parts MUCFH-A18WV - MUCFH-A24WV - Figure Part name Check method and criterion Defrost Measure the resistance with a tester. thermistor (RT61) (Part temperature -10°C ~ 40°C) Ambient temper- Normal Abnormal ature thermistor 5kΩ ~ 60kΩ Open or short-circuit (RT63) MUCFH-A24WV...
  • Page 22 Compressor and/or outdoor fan motor doesn’t operate. Check of outdoor unit MUCFH-A18WV - Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch. 3-minute time delay works. Test run operation operates for 30 minutes. Compressor Rectify the indoor and doesn't operate.
  • Page 23 Compressor and/or outdoor fan motor doesn’t operate. Check of outdoor unit MUCFH-A24WV - Start Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch. 3-minute time delay works. Test run operation operates for 30 minutes. Compressor doesn't operate.
  • Page 24 When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit does not operate. How to check mis-wiring and serial signal error (when outdoor unit does not work) w 1 Short circuit of JPG and JPS on the electronic control P.C. board enables self-check to be displayed in 3 seconds.
  • Page 25 Compressor and/or outdoor fan motor doesn’t stop. Check of outdoor unit 1 Turn OFF the power supply. 2 After 30 seconds, turn ON the power supply again. 3 Operate the unit in COOL or HEAT 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.
  • Page 26 When OPERATION INDICATOR lamp flashes 6-time. Thermistors in the outdoor unit are abnormal. Check of outdoor thermistor w Disconnect the connectors CN661 from the deicer P.C. board. (Check the characteristics of each thermistor.) Replace the deicer P.C. board. Defrost thermistor(RT61) Reconnect CN661.
  • Page 27 MUCFH-A18WV - Outdoor deicer P.C. board CN711 CN721 Power supply input Outdoor fan motor R.V. coil 230V AC 230V AC 230V AC NR61 Varistor Fuse 2A/250V R601 5~10V DC Defrost interval time short pin (JPDS, JPSG) (Refer to page 18.) Jumper wire for change in defrost setting...
  • Page 28 MUCFH-A24WV - Outdoor deicer P.C. board Defrost thermistor (RT61) -20 -10 10 20 30 40 Temperature(:) CN661 1-2 Defrost thermistor (RT61) Fan motor (Refer to page 26.) Varistor (CN711) (NR62) 230V R.V. coil (CN721) 230V Defrost interval time short 12V DC pin(JPG1, R871) Fuse (F61)

  • Page 29: Disassembly Instructions

    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.
  • Page 30 OPERATING PROCEDURE PHOTOS 3. Removing the propeller and the outdoor fan motor (1) Remove the cabinet. (Refer to 1.) Photo 4 Set screws of the (2) Remove the propeller nut and the propeller. outdoor fan motor Propeller NOTE : Loose the propeller in the rotating direction for Lead clamps removal.
  • Page 31 12-2. MUCFH-A24WV - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1.Removing the cabinet Photo 1 Screw of the top panel (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover. (4) Remove the service panel.
  • Page 32 OPERATING PROCEDURE PHOTOS 3. Removing the propeller and the outdoor fan motor Photo 5 (1) Remove the cabinet. (Refer to 1.) (2) Remove the propeller nut and the propeller. NOTE : Loose the propeller in the rotating direction for Set screws of the removal.

  • Page 33: Parts List

    PARTS LIST MUCFH-A18WV - 13-1. OUTDOOR UNIT STRUCTURAL PARTS, 13-2. ACCESSORY ELECTRICAL PARTS AND FUNCTIONAL PARTS DEFROST THERMISTOR 13-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Part No.
  • Page 34 MUCFH-A24WV - 13-3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 13-4. ACCESSORY...
  • Page 35 MUCFH-A24WV - 13-3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Remarks Part No. Part Name MUCFH-A24WV - Diagram E02 819 297 TOP PANEL E02 821 630 OUTDOOR HEAT EXCHANGER E02 821 301...
  • Page 36 HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jul. 2005. No.OB337 REVISED EDITION-B 6 Distributed in Apr. 2004. No.OB337 REVISED EDITION-A 6 Distributed in Feb. 2004. No.OB337 6 New publication, effective Jul. 2005 Made in Japan Specifications subject to change without notice.

This manual is also suitable for:

Mucfh-a24wv-e1

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