SERVICE MANUAL

When repairing or inspecting the circuit must be done without turning off the power, be very careful not to touch the live parts. Doing so may cause a burst, explosion or fire when the unit is used, serviced or disposed of.

OBH723D

NOISE CRITERIA CURVES

MXZ-4E83VA

MXZ-4E72VA

MXZ-5E102VA

MXZ-4E83VAHZ

MXZ-2E53VAHZ

OUTLINES AND DIMENSIONS

MXZ-3E54VA MXZ-3E68VA

WIRING DIAGRAM

MXZ-4E83VA - E1

MXZ-4E83VA - E2

MXZ-4E83VA - E3

MXZ-4E83VA - ET1

MXZ-4E83VA - ET2

MXZ-4E83VA - ET3

MXZ-4E83VA - ER1

MXZ-4E83VA - ER2

MXZ-5E102VA - E1

MXZ-5E102VA - E2

MXZ-5E102VA - E3

MXZ-5E102VA - ET1

MXZ-5E102VA - ET2

MXZ-5E102VA - ET3

MXZ-5E102VA - ER1

MXZ-5E102VA - ER2

MXZ-2E53VAHZ - E1

MXZ-2E53VAHZ - ER1

MXZ-4E83VAHZ - E1

MXZ-4E83VAHZ - E2

MXZ-4E83VAHZ - ER1

MXZ-4E83VAHZ - ER2

REFRIGERANT SYSTEM DIAGRAM

MXZ-3E54VA

MAX REFRIGERANT PIPING LENGTH

ADDITIONAL REFRIGERANT CHARGE

WHEN CONNECTING TO MFZ-KJ SERIES INDOOR UNIT MXZ-3E54VA

MXZ-3E68VA

WHEN CONNECTING TO MFZ-KJ SERIES INDOOR UNIT MXZ-3E68VA

WHEN CONNECTING TO MFZ-KJ SERIES INDOOR UNIT MXZ-4E72VA

If the diameter of the refrigerant piping is different from that of the outdoor unit connection, use the optional piping with a different diameter. When moving or disposing of the air conditioner, pump down the system according to the procedure below so that no refrigerant is released into the atmosphere. If too much refrigerant is added to the air conditioner system, the pressure may not drop to 0.05 to 0 MPa [meters] (about 0.5 to 0 kgf/cm²), or the protection function may work due to the pressure increase in the high pressure refrigerant circuit.

If this happens, use the refrigerant collection device to collect all the refrigerant in the system, and then refill the system with the correct amount of refrigerant after relocating the indoor and outdoor units. The compressor can burst and cause damage if a foreign substance, such as air, enters the pipe.

PUMPING DOWN

PERFORMANCE CURVES

2) AIR FLOW

3) MAIN READINGS

How to measure the indoor air wet and dry bulb temperature difference

MXZ-3E54VA MXZ-3E68VA MXZ-4E72VA

MXZ-4E83VA MXZ-5E102VA MXZ-2E53VAHZ MXZ-4E83VAHZ

8-1. CAPACITY AND THE INPUT CURVES

8-2. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY (single operation)

MXZ-3E54VA 15-class unit

22-class unit 18-class unit

20-class unit

25-class unit

35-class unit

42-class unit

50-class unit

22-class unit

60-class unit

15-class unit

50-class unit 35-class unit

Press the EMERGENCY switch to start COOL or HEAT mode (COOL: press once, HEAT: press twice). To cancel trial operation or EMERGENCY OPERATION, press the EMERGENCY OPERATION switch or any button on the remote control.

1) COOL operation

15-class unitMXZ-3E54VA

18-class unit

71-class unit

MXZ-2E53VAHZ 15-class unit

MXZ-4E83VAHZ 15-class unit

2) HEAT operation

25-class unit 35-class unitMXZ-3E54VA

25-class unit 35-class unitMXZ-3E68VA MXZ-4E72VA

ACTUATOR CONTROL

Relation between main sensor and actuator

SERVICE FUNCTIONS

LED SW1

The outdoor unit has an automatic line correction function that automatically detects and corrects incorrect wiring or piping. Incorrect wiring or piping can be automatically detected by pressing the piping/wiring correction switch (SW871). This function does not work if the outdoor temperature is not higher than 0˚C.) 2. Check that the stop valves of the liquid line and gas line are open.

When this function is activated during indoor unit operation, operation will be interrupted. Make sure the valves are open and the pipes are not collapsed or blocked. The LED will show the autocorrect record for about 30 seconds as shown in the table below:

Activate this function to confirm the correct wiring after replacing the outdoor control P.C. Previous registrations are deleted when the outdoor control P.C. the plate is replaced). The record cannot be displayed if the automatic line correction is not canceled (see "How to activate this function"). CHANGING THE Ampere Limit (MXZ-2E53VAHZ MXZ-4E83VAHZ) With this function, the amount of current flowing in the outdoor unit can be changed.

With this function, the amount of current flowing in the outdoor unit can be changed.

11 TROUBLESHOOTING

Troubleshooting procedure

Take care of the following during servicing

11-2. FAILURE MODE RECALL FUNCTION

Flow chart of the detailed outdoor unit failure mode recall function

2-times f ash Outdoor power system Illuminated Illuminated Overcurrent protection trip operates 3 consecutive times within 1 minute after the compressor starts, or converter protection trip or bus voltage protection trip operates 3 consecutive times within 3 minutes after startup. 6 times high pressure Light Light The outdoor heat exchanger temperature exceeds 70°C during cooling, or the indoor gas pipe temperature exceeds 70°C during heating. Current sensor Lights up 7 times A short or open circuit is detected in the current sensor during compressor operation.

15-times f ash LEV and drain pump Lit Lit The indoor unit detects an abnormality i.

11-3. INSTRUCTION OF TROUBLESHOOTING

Ω ~ 53.9 ΩNormal

11-6. TROUBLESHOOTING FLOW

Is there any miswiring, poor contact or wire disconnection of the indoor/outdoor connecting wire. 1 Wrong wiring can damage the electronic control P.C. damage indoors. Be sure to confirm that the wiring is correct before starting work. Is there an error in the indoor/outdoor connection wire, such as wire damage, intermediate connection, poor contact with the terminal block.

How to check miswiring and serial signal error (when outdoor unit does not work)

Turn ON the power supply to the outdoor unit after checking that LEV coil is securely mounted to the LEV body. Disconnect the terminal of the compressor or the connector (CNMC) between the compressor and the external power P.C. Turn OFF the power supply of indoor and outdoor unit, and measure the compressor winding resistance between the compressor terminals.

Reconnect the lead wire of the compressor and turn ON the power supply to indoor and outdoor unit. 1 • After the outdoor fan starts running, wait for 1 minute or more before measuring the voltage. 2 • The output varies depending on the capacity or the number of indoor units to be operated.

Reconnect the connector in the following table and disconnect the lead wire leading to the compressor. Switch on the power supply to start the operation and measure the voltage of connector CNF1. Turn ON the power supply and measure the voltage of connector CNF1 while turning the motor by hand.

Check of outdoor fan motor

Check of bus-bar voltage

Check of HPS

OPERATING PROCEDURE PHOTOS

Removing the cabinet and the panels

DISASSEMBLY INSTRUCTIONS

3 . Removing the fan motor

Removing the compressor and the 4-way valve (1) Remove the service panel (Photo 1)
Removing the expansion valve (1) Remove the service panel (Photo 1)
Removing the panels
Removing the fan motor
Removing the expansion valve
Removing the compressor and 4-way valve (1) Remove the service panel, the top panel, the handle (R
Removing the defrost heater
Removing the compressor and 4-way valve (1) Remove the service panel, the top panel, the handle (R
Removing the compressor and 4-way valve

Screws on the back panel. the plate, the reactor and the outdoor current P.C. board tor and the outdoor power P.C. 1) Remove the service panel and top panel (see 1). Compressor and 4-Way Valve Removal(1) Remove the service panel, top panel, handle (R (1) Remove the service panel, top panel, handle (R. Screws on the back panel Photo 2. Screws off the front panel, reactor and outdoor power P.C. board and the outdoor power P.C. 1) Remove the service panel, top panel and front panel (see 1).

OBH723D 123