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SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-HJ25VA
MUZ-HJ35VA
MUZ-HJ25VA
MUZ-HJ35VA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
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E1
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E1
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 5
5. OUTLINES AND DIMENSIONS ························ 6
6. WIRING DIAGRAM ············································ 7
7. REFRIGERANT SYSTEM DIAGRAM ··············· 8
8. PERFORMANCE CURVES ······························· 9
9. ACTUATOR CONTROL ··································· 18
10. SERVICE FUNCTIONS ···································· 19
11. TROUBLESHOOTING ····································· 19
12. DISASSEMBLY INSTRUCTIONS ···················· 33
PARTS CATALOG (OBB648)
No. OBH648
HFC
utilized
R410A
Indoor unit service manual
MSZ-HJ•VA Series (OBH647)
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Related Manuals for Mitsubishi Electric MUZ-HJ25VA-E1
Summary of Contents for Mitsubishi Electric MUZ-HJ25VA-E1
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Page 1: Table Of Contents
SPLIT-TYPE AIR CONDITIONERS OUTDOOR UNIT No. OBH648 SERVICE MANUAL utilized R410A Models MUZ-HJ25VA MUZ-HJ35VA Indoor unit service manual MSZ-HJ•VA Series (OBH647) CONTENTS MUZ-HJ25VA MUZ-HJ35VA 1. TECHNICAL CHANGES ··································· 3 2. PART NAMES AND FUNCTIONS ····················· 3 3. SPECIFICATION ················································ 4 4. - Page 2 Use the specifi ed refrigerant only Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.
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Page 3: Technical Changes
TECHNICAL CHANGES MUZ-HJ25VA - MUZ-HJ35VA - 1. New model PART NAMES AND FUNCTIONS MUZ-HJ25VA MUZ-HJ35VA Air inlet (Back and side) Piping Drain hose Air outlet Drain outlet ACCESSORIES Drain socket OBH648... -
Page 4: Specification
SPECIFICATION Outdoor model MUZ-HJ25VA MUZ-HJ35VA Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (1.3 - 3.0) 3.15 (1.4 - 3.5) Capacity Rated frequency (Min.-Max.) Heating 3.15 (0.9 - 3.5) 3.6 (1.1 - 4.1) Breaker Capacity Cooling 1,040 Power input 1 (Total) Heating Cooling Running current 1... -
Page 5: Noise Criteria Curves
NOISE CRITERIA CURVES MUZ-HJ25VA MUZ-HJ35VA FUNCTION SPL(dB(A)) LINE FUNCTION SPL(dB(A)) LINE COOLING COOLING HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR HEARING FOR NC-20 NC-20 CONTINUOUS CONTINUOUS NOISE NOISE 1000 2000... -
Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-HJ25VA MUZ-HJ35VA Unit : mm REQUIRED SPACE Air in Drain hole ø33 Air in Air out 2 - 10.3 X 19.3 Oval hole 349.5 17.9 Liquid refrigerant pipe joint Refrigerant pipe (flared) ø6.35 Gas refrigerant pipe joint Refrigerant pipe (flared) ø9.52 121.4 55.7... -
Page 7: Wiring Diagram
WIRING DIAGRAM MUZ-HJ25VA MUZ-HJ35VA OBH648... -
Page 8: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-HJ25VA MUZ-HJ35VA Unit : mm 4-way valve Refrigerant pipe ø9.52 Muffler (with heat insulator) (HJ35 only) Stop valve (with service port) Outdoor Muffler Discharge heat Flared connection exchanger temperature thermistor RT62 Compressor Defrost thermistor RT61 Strainer #100 Flared connection Capillary tube ø... -
Page 9: Performance Curves
PERFORMANCE CURVES MUZ-HJ25VA MUZ-HJ35VA The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating condi- tions vary according to the areas where these units are installed, the following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve. - Page 10 8-1. CAPACITY AND INPUT CURVES Cooling capacity Outdoor intake air Dry-bulb temperature (°C) Total input (cooling) 18 20 Outdoor intake air Dry-bulb temperature (°C) 22.9 20.6 19.0 21.1 19.3 17.4 17.6 15.8 14.3 15.8 14.1 12.7 12.3 11.1 10.5 Outdoor intake air Wet-bulb temperature (°C) Outdoor intake air Wet-bulb temperature (°C) NOTE: The above broken lines are for the heating operation without any frost and defrost operation.
- Page 11 8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-HJ25VA Correction of Cooling capacity Correction of Cooling total input Correction of Heating total input Correction of Heating capacity (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ-HJ35VA...
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Page 12: Heat Operation
8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Dry-bulb temperature (°C) Relative humidity (%) Both indoor and outdoor unit are under the same tempera- ture/humidity condition. Operation: TEST RUN OPERATION (Refer to 8-3.) Outdoor low pressure MUZ-HJ25VA MUZ-HJ35VA (kgf/cm [Gauge])(MPa [Gauge]) (kgf/cm... - Page 13 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HJ25VA CAPACITY: 2.5 kW SHF: 0.89 INPUT: 730 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.94 2.09 0.71 2.81 2.00...
- Page 14 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HJ25VA CAPACITY: 2.5 kW SHF: 0.89 INPUT: 730 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.45 1.74 0.71 2.25 1.60 0.71 2.08 1.47...
- Page 15 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HJ35VA CAPACITY: 3.15 kW SHF: 0.87 INPUT: 1040 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.70 2.55 0.69 3.54 2.45...
- Page 16 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HJ35VA CAPACITY: 3.15 kW SHF: 0.87 INPUT: 1040 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.09 2.13 0.69 1019 2.84 1.96 0.69 1082...
- Page 17 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-HJ25VA CAPACITY: 3.15 kW INPUT: 870 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 1.98 2.39 2.80 3.21 3.62 4.00 4.41 1.89 2.27 2.68 3.06 3.47 3.84 4.24 1.70 2.11...
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Page 18: Actuator Control
ACTUATOR CONTROL MUZ-HJ25VA MUZ-HJ35VA 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 Compressor... -
Page 19: Service Functions
SERVICE FUNCTIONS MUZ-HJ25VA MUZ-HJ35VA 10-1. CHANGE IN DEFROST SETTING <JS> When the JS wire of the inverter P.C. board is cut/ soldered, the defrost finish temperature is changed. (Refer to 11-6-1.) Jumper wire Defrost fi nish temperature (°C) Soldered (Initial setting) None (Cut) 10-2. -
Page 20: Outdoor Unit
11-2. FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (11-3.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which does not recur. -
Page 21: Outdoor Unit
2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function. 1. -
Page 22: Outdoor Unit
3. Outdoor unit failure mode table The upper lamp of Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Remedy failure mode INDICATOR (Failure mode/protection) (Outdoor P.C. board) mode recall recall function lamp function (Indoor unit) None (Normal) —... -
Page 23: Outdoor Unit
11-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time fl ash every Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of compres- does not op- 2.5 seconds within 1 minute after the compressor gets started, or failure of sor. - Page 24 11-4. TROUBLE CRITERION OF MAIN PARTS MUZ-HJ25VA MUZ-HJ35VA Part name Check method and criterion Figure Measure the resistance with a tester. Defrost thermistor (RT61) Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, for the chart of thermistor. Measure the resistance with a tester.
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Page 25: A How To Check Inverter/Compressor
11-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector (CN61) between compressor and the power module (IC700). Check the voltage between terminals. See 11-5. “Check of open phase”. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor. See 11-5. - Page 26 C Check of compressor Refer to 11-5. “Check of compressor winding”. Replace the compressor. Is the compressor normal? Refer to 11-5. “Check of compressor operation time”. Refer to 11-5. “Check of compressor start failure”. Does the compressor operate continuously? D Check of compressor winding ●...
- Page 27 F Check of compressor start failure Make sure that is normal. •Electrical circuit check . Contact of the compressor connector (Including CN61) . Output voltage of inverter P.C. board and balance of them (See 11-5. ) . Direct current voltage between DB61(+) and (-) on the inverter P.C. board .
- Page 28 H Check of R.V. coil First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 11-4. In case CN721 is not connected or R.V. coil is open, voltage is generated between the terminal pins of the connector although any signal is not being transmitted to R.V.
- Page 29 250 - 370 VDC J Check of power supply Disconnect the connector (CN61) DB61 between compressor and power module. Turn ON power supply and press Rectify indoor/outdoor connecting wire. EMERGENCY OPERATION switch. Inverter P.C. board (Solder side) Is there voltage 230 VAC Replace the indoor Does the upper lamp of OPERATION between the indoor terminal...
- Page 30 L How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the Check the power supply. power supply? 1. Turn ON the power supply. 2. Press the emergency operation switch. Has the relay 52C been turned on 3 minuets later ? [The relay will be turned on in 3 to 7 seconds by short circuiting the timer short mode point (Refer to 10-7.).] Initializing the determination of the power...
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Page 31: Noise
M Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 3 m, or is the the indoor unit, and/or the antennas and the distance between the antennas and the outdoor unit. - Page 32 11-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-HJ25VA MUZ-HJ35VA Back side of unit Output to drive outdoor R.V. coil fan motor (CN771) (CN721) Smoothing Fuse (F801) DB61 230 VAC capacitor (C61) T3.15AL250V Fuse (F701) 250 V - 370 VDC T3.15AL250V Output to drive...
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Page 33: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types (refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. - Page 34 OPERATING PROCEDURE PHOTOS Photo 4 2. Removing the inverter assembly, inverter P.C. board Screw of the Screws of the terminal (1) Remove the cabinet and the panels. (Refer to 1.) heat sink and the block support and the (2) Disconnect the lead wire to the reactor and the follow- separator back panel ing connectors:...
- Page 35 OPERATING PROCEDURE PHOTOS Photo 6 4. Removing the discharge temperature thermistor Brazed part of the 4-way valve and the defrost thermistor (1) Remove the cabinet and the panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the follow- ing connectors: <Inverter P.C.
- Page 36 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Dec. 2012. No. OBH648 New publication, effective Dec. 2012 Made in Japan Specifications are subject to change without notice.
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