Mitsubishi Electric MXZ-4E72VA-E1

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HFC

utilized

R410A

SERVICE MANUAL

No. OBH723

REVISED EDITION-G

OUTDOOR UNIT

NOTE:

RoHS compliant products have <G> mark

on the spec name plate.

PARTS CATALOG (OBB723)

Models

MXZ-3E54VA

ET1

ET2

ER1

ER2

MXZ-3E68VA

ET1

ET2

ER1

ER2

MXZ-4E72VA

ET1

ET2

ER1

ER2

MXZ-4E83VA

ET1

ET2

ET3

ET4

ER1

ER2

ER3

MXZ-5E102VA

ET1

ET2

ET3

ET4

ER1

ER2

ER3

MXZ-2E53VAHZ

ER1

ER2

MXZ-4E83VAHZ

ER1

ER2

ER3

Indoor unit service manual

MSZ-EF•VE Series (OBH589)

MSZ-SF•VA Series (OBH555)

MSZ-SF•VE Series (OBH600)

MSZ-FD•VA Series (OBH488)

MSZ-FH•VE Series (OBH623)

MSZ-GA•VA Series (OB378)

MSZ-AP•VF Series (OBH799)

MSZ-AP•VG(K) Series (OBH589, OBH791)

MSZ-LN•VG Series (OBH766)

MSZ-GE•VA Series (OBH515)

MSZ-GF•VE Series (OBH634)

MFZ-KA•VA Series (OB409)

MFZ-KJ•VE Series (OBH666)

MLZ-KA•VA Series (OBH483)

SLZ-KA•VA Series (OC320)

SEZ-M•DA(L)Series (HWE17040)

SEZ-KD•VA Series (HWE07110)

PLA-RP•BA Series (OCH412)

PCA-RP•KA Series (OCH454)

PEAD-RP•JA Series (HWE08130)

CONTENTS

1. TECHNICAL CHANGES ··································· 3

2. PART NAMES AND FUNCTIONS ····················· 4

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

4. NOISE CRITERIA CURVES ···························· 12

5. OUTLINES AND DIMENSIONS ······················ 14

6. WIRING DIAGRAM ·········································· 20

7. REFRIGERANT SYSTEM DIAGRAM ············· 56

8. PERFORMANCE CURVES ····························· 64

9. ACTUATOR CONTROL ··································· 92

10. SERVICE FUNCTIONS ···································· 93

11. TROUBLESHOOTING ····································· 96

12. DISASSEMBLY INSTRUCTIONS ···················118

MXZ-4E83VA

MXZ-5E102VA

MXZ-2E53VAHZ

OBH723 REVISED EDITION-F is void.

Revision G:

• MXZ-3E54VA-

ER2

, MXZ-3E68VA-

ER2

, MXZ-

4E72VA-

ER2

, MXZ-4E83VA-

ER3

, MXZ-5E102VA-

ER3

, MXZ-2E53VAHZ-

ER2

and MXZ-4E83VAHZ-

ER3

have been added.

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This document is a service manual for Mitsubishi Electric outdoor unit air conditioners, specifically models MXZ-3E54VA, MXZ-3E68VA, MXZ-4E72VA, MXZ-4E83VA, MXZ-5E102VA, MXZ-2E53VAHZ, and MXZ-4E83VAHZ. It provides comprehensive information for servicing and maintaining these units.

Function Description

These outdoor units are part of a multi-split air conditioning system, designed to connect with multiple indoor units to provide cooling and heating. The manual details the refrigerant system, electrical wiring, and operational characteristics that govern their function. Key components include the compressor, fan motor, expansion valves, and various thermistors that monitor temperatures for control and protection. The units are designed to operate with R410A refrigerant.

Important Technical Specifications

The manual provides detailed specifications for each model, including:

Power Supply: Single phase, 220-230-240 V, 50 Hz / 220V, 60Hz (note that 220V and 240V are only applicable to specific model revisions like -E2, -ET2, -ER2, -E3, -ET3, -ER3, -E4, -ET4).
Indoor Units Number:
- MXZ-3E54VA, MXZ-3E68VA: 2 to 3 units
- MXZ-4E72VA, MXZ-4E83VA, MXZ-4E83VAHZ: 2 to 4 units
- MXZ-5E102VA: 2 to 5 units
- MXZ-2E53VAHZ: 2 units
Piping Length:
- Total piping length: Max. 50m (MXZ-3E54VA), Max. 60m (MXZ-3E68VA, MXZ-4E72VA), Max. 70m (MXZ-4E83VA, MXZ-4E83VAHZ), Max. 80m (MXZ-5E102VA), Max. 30m (MXZ-2E53VAHZ)
- Connecting pipe length: Max. 25m for all models.
- Height difference (Indoor ~ Outdoor / Indoor ~ Indoor): Refer to the refrigerant system diagram for specific limits.
Capacity (Rated frequency, Min.-Max.):
- MXZ-3E54VA: Cooling 5.4 kW (2.9-6.8), Heating 7.0 kW (2.6-9.0)
- MXZ-3E68VA: Cooling 6.8 kW (2.9-8.4), Heating 8.6 kW (2.6-10.6)
- MXZ-4E72VA: Cooling 7.2 kW (3.7-8.8), Heating 8.6 kW (3.4-10.7)
- MXZ-4E83VA: Cooling 8.3 kW (3.7-9.2), Heating 9.3 kW (3.4-11.6)
- MXZ-5E102VA: Cooling 10.2 kW (3.9-11.0), Heating 10.5 kW (4.1-14.0)
- MXZ-2E53VAHZ: Cooling 5.3 kW (1.1-6.0), Heating 6.4 kW (1.0-7.0)
- MXZ-4E83VAHZ: Cooling 8.3 kW (3.5-9.2), Heating 9.0 kW (3.5-11.6)
Power Input (Total): Varies by model and operation (Cooling/Heating). For example, MXZ-3E54VA is 1,350W (Cooling) and 1,590W (Heating).
Running Current (Total): Varies by model and operation. For example, MXZ-3E54VA is 6.2-5.9-5.7A (Cooling) and 7.3-7.0-6.7A (Heating).
Power Factor (Total): Typically 99%.
Starting Current (Total): Typically 7.0A to 13.8A depending on the model.
Coefficient of Performance (C.O.P): Varies by model and operation. For example, MXZ-3E54VA is 4.00 (Cooling) and 4.40 (Heating).
Compressor: Models use SNB130FGBH1T, SNB172FEGH1T, SNB220FAGMC, or MNB33FBTMC-L.
Fan Motor: Models use SIC-71FW-F764-2, SIC-82FX-F764-1, SIC-81FW-D888-9, SIC-88FWJ-D888-1, or SIC-88FWJ-D888-4.
Dimensions (W x H x D):
- MXZ-3E54VA, MXZ-3E68VA, MXZ-4E72VA: 840 x 710 x 330 mm
- MXZ-4E83VA, MXZ-5E102VA, MXZ-2E53VAHZ: 950 x 796 x 330 mm
- MXZ-4E83VAHZ: 950 x 1,048 x 330 mm
Weight: Varies from 58 kg to 87 kg.
Air Flow (Rated): Varies from 2,334 m³/h to 4,620 m³/h.
Sound Level (Rated): Varies from 45 dB(A) to 57 dB(A).
Fan Speed (Rated): Varies from 520 rpm to 770 rpm.
Refrigerant Filling Capacity (R410A): Varies from 2.0 kg to 3.9 kg.

Usage Features

The manual outlines several operational and maintenance features:

Pre-Heat Control: This function energizes the compressor even when not operating to generate heat, preventing moisture interference or refrigerant liquefaction during startup. It consumes about 50W and is ON by default. It can be deactivated by setting SW2's "4" switch to ON on the outdoor control P.C. board.
Operation Mode Locking (MXZ-4E83VAHZ only): This feature allows locking the outdoor unit's operation mode to either COOL/DRY or HEAT only. This is useful for specific applications and is OFF by default. It can be activated by setting SW1's "5" switch to ON on the outdoor control P.C. board.
Lowering Operating Noise (MXZ-4E83VAHZ only): This function reduces the outdoor unit's operating noise when the load is small (e.g., during nighttime cooling). However, it may also lower cooling and heating capacity. It is OFF by default and can be enabled by setting SW1's "5" switch to ON on the outdoor control P.C. board.
Auto Line Correcting: This function automatically detects and corrects improper wiring or piping. It can be activated by pressing the SW871 switch on the outdoor control P.C. board and takes 10-20 minutes to complete. The LED indicators provide feedback on the correction status (completed/failed).
Changing Ampere Limit (MXZ-2E53VAHZ, MXZ-4E83VAHZ only): This function allows changing the current flow limit in the outdoor unit, useful when the current exceeds the allowed value. Settings are made via SW2 on the outdoor control P.C. board, with options for factory settings (13.6A or 21A) or increased limits (18.4A or 25A).

Maintenance Features

The manual provides detailed instructions for troubleshooting and disassembly:

Troubleshooting: Includes a comprehensive troubleshooting check table with LED indications (LED1 Red, LED2 Yellow) for various abnormal conditions (e.g., outdoor power system, thermistor errors, overcurrent, high pressure, communication errors, LEV/drain pump abnormalities). It also describes a failure mode recall function to retrieve memorized abnormal conditions, even if the LED indication has disappeared.
Trouble Criterion of Main Parts: Provides resistance values and voltage checks for key components like the compressor, outdoor fan motor, R.V. coil, linear expansion valve, and high-pressure switch, along with thermistor resistance charts for different temperatures.
Troubleshooting Flow: A step-by-step guide for diagnosing issues, starting with power supply checks and progressing to component-specific tests.
Disassembly Instructions: Detailed procedures with photos for removing the cabinet, panels, outdoor control P.C. board, outdoor power P.C. board, reactor, fan motor, compressor, 4-way valve, expansion valves, and defrost heater. This section emphasizes safety precautions, such as turning off the power supply and discharging capacitors before working on electrical parts. It also highlights the proper handling of connectors and lead wires.

The manual is regularly revised, with "Revision G" being the latest, adding specific model revisions (e.g., MXZ-3E54VA-ER2, MXZ-4E83VA-ER3) to the list of covered units. It also notes that RoHS compliant products are marked with a "" on their spec name plate.