INSTALLATION MANUAL FOR A-M CONVERTER

SAFETY PRECAUTIONS

Before starting installation, read the "Safety Precautions" described below.

The following precautions must be observed as it describes the serious matters for safety. The safety precautions are described with the degree of danger.

⚠️ WARNING: When you handle wrong, it can lead to death or serious injury.

❗ CAUTION: When you handle wrong, it can lead to injury or damage to building and furniture.

After installation, make test operation and confirm that it works properly, and explain the safety precautions, operation method, and maintenance to your customers. Tell your customers to keep this installation manual together with operation manual with them, and when they give or sell this machine to other person put this installation manual and operation manual with it.

Installation Requirements

⚠️ WARNING:

• The installation must be done by a dealer or qualified person. If customers install it themselves and it is not perfectly installed, it can cause water leak, electric shock, or fire.
• The installation must be done in accordance with this manual. If the installation is not perfectly done, it can cause water leak, electric shock, or fire.
• Never try any modification. For repair, ask your dealer. If the machine is not modified or repaired completely, it can cause water leak, electric shock, or fire.
• Never move or reinstall the machine by customers. If the installation is not perfectly done, it can cause water leak, electric shock, or fire. Ask your dealer or qualified person.

Wiring Precautions

• The wiring must be securely done by using proper cable. Wires should be connected to terminals without external force. Faulty connections can cause heat or fire.
• The terminal cover (panel) of the unit must be installed securely. Faulty installation can cause fire or electric shock by dust or water.
• Electric installation must be done by a qualified person in accordance with this manual. Use a separate circuit only for this machine and use rated voltage and circuit breaker. If the electric circuit power is not sufficient or the wiring is not properly done, it can cause electric shock or fire.

Before Electric Wiring

• Install a circuit breaker depending upon the location. Without a circuit breaker, it can cause electric shock.
• Use standard wires which meet current capacity. Otherwise, it can cause short-circuit, heat, or fire.
• Wires must not have tension. It can cause snipping, heat, or fire.

❗ CAUTION (Grounding & Fuses)

• Grounding: Put ground wire. Never ground to gas pipe, water pipe, lightning conductor, or telephone ground wire. Faulty ground can cause short-circuit.
• Fuses: Use proper fuses. If you use larger size fuses or needle wire, it can cause failure or fire.

Before Test Operation

❗ CAUTION:

• Turn the power on 12 hours or more before operation. If you start operation as soon as the power is on, it can cause failure.
• Never turn the power off during the season.
• Never operate the machine without panel or guard off. It can cause serious injury from rotating parts, burns, or electric shock from high voltage parts.
• Never operate the machine without the air filter off. It can cause failure due to dust.
• Never operate switches with wet hands. It can cause electric shock.
• Never touch refrigerant pipes while the machine is running. Refrigerant pipes become high and low temperature during operation. Touching them can cause chilblain or burns.
• Never turn the power off immediately after the machine stops. Wait for 5 minutes or more. This can cause water leak or failure.

Attention for M-NET Connection

Pay attention to the following points for wiring of shielded wires.

❗ CAUTION:

The shielded wires of M-NET transmission should be connected with the ground wire at only one place of the unit to be connected.

This can cause transmission errors due to noise. Centralized control remote controllers may read "0403" or "6607" errors.

Wiring Examples

Bad example (Multiple ground of shielded wire):

Diagram description: Shows a System controller, Power supply unit, and two Outdoor units (※1). The M-NET transmit wire is marked 'NO' for connection to each outdoor unit, indicating an incorrect multiple ground setup.

Good example (One spot ground of shielded wire):

Diagram description: Shows a System controller, Power supply unit, and two Outdoor units (※1). The M-NET transmit wire is marked 'OK' for connection, indicating a correct single ground setup.

Explanation of (※1): Refer to the appendix List of Models to check applicable models.

Explanation of (※2): In case the outdoor unit is grounded, connect the ground wire supplied as accessory to the 'S' terminal (secondary) of the M-NET terminal block and the M-NET Ground terminal inside the electric box using the supplied screws.

Diagram description: Shows a close-up of the M-NET terminal block with connections for Transmit wire and Shielded wire, and an accessory Ground wire.

Explanation of (※3): If the shield and earth are grounded in two or more locations, an electrical circuit is generated through them, creating a potential difference due to impedance differences. This may cause noise in the shield. Ground at only one point to prevent this.

1. Parts List

(※1) Refer to the appendix List of Models to check the applicable models.

2. Wiring Method for M-NET

Caution for wiring

• Never supply voltage 208V-230VAC to the terminals for M-NET transmission. If the voltage is supplied, it can break the electronic parts on the M-NET board.
• Use the shielded cable (CVVS, CPEVS, MVVS) of 1.25mm² (AWG 16) with 2 wires (polarity is not a concern) for the transmission cable. Never use transmit wires of different systems with a cable containing multi wires. The communication of transmit signals will not work properly and can cause wrong operation.
• The power consumption coefficient ※1 of the M-NET board is "1".

※1 "Power consumption coefficient" is a coefficient to calculate the relative power consumption of the devices that receive power through the M-NET transmission cable.

M-NET Wiring Diagram

Diagram description: Illustrates the M-NET connection for a system including a System controller, Power supply unit, and multiple Outdoor units. Each Outdoor unit contains an M-NET board connected to indoor units. Remote controllers (MA: MA remote controller, RC: Wireless remote controller) are shown connected to indoor units. The diagram shows two configurations, one for MXZ-5E102VA (up to 5 indoor units) and one for MXZ-4E83VA (up to 4 indoor units). The maximum transmission distance is 200m (656 ft).

3. Switch Setting

Before installation: Set M-NET address on M-NET board in advance before installing on the electrical box.

(1) M-NET Head Address Setting

The setting should be done by rotary switches SW11 and SW12 on the M-NET board. (Factory settings are all Zero). Make sure to set M-NET address within the range of 01 to 50. When installing two or more outdoor units, do not use the same number more than once for M-NET address.

Diagram description: Shows the M-NET board with rotary switches SW11 and SW12. A table indicates M-NET address numbers (1, 2, 50) and how SW11 (1 digit) and SW12 (10 digit) are used for setting.

(2) Indoor Unit Connection Switch Setting

Set each indoor unit to ON or OFF with SW1.

M-NET Address Setting Example

Starting with the M-NET head address set with SW11 and SW12 (e.g., 01), the M-NET addresses are automatically allocated in numerical order to each connected indoor unit (e.g., 02, 03, 04, 05, 06).

Ex1) Diagram description: Shows M-NET head address set to '01' using SW11/SW12. The indoor unit connection setting uses SW1. For 'Indoor connect', SW1 switches 1-6 are set to ON. This results in M-NET addresses 1, 2, 3, 4, 5, 6 for indoor units A, B, C, D, E, F respectively.

Ex2) Diagram description: Shows M-NET head address set to '07' using SW11/SW12. The indoor unit connection setting uses SW1. For 'Indoor connect', SW1 switches 2, 4, 5, 6 are set to ON. This results in M-NET addresses for indoor units B, D, E, F being Head address + 1, Head address + 3, Head address + 4, Head address + 5 (assuming A is not connected or handled differently). The diagram shows addresses 7, 8, 9, 10 for indoor units A, B, C, D, E, F, which seems to imply a different mapping or a simplified representation.

Example of M-NET Address Setting Diagram description: Shows a System controller connected to a Power supply unit, then to an Outdoor unit with an M-NET board. Indoor units A through E are connected. The M-NET board has SW11/SW12 set to '01' and SW1 switches 1-5 ON. This results in addresses: A=01, B=02, C=03, D=04, E=05. A second example shows an Outdoor unit with M-NET board set to '06' and SW1 switches 2, 4, 5 ON. This results in addresses: B=06, D=07, E=08. Indoor units A, C are shown as 'None' or 'No connection'.

Note: M-NET address should be set within the range of 01 to 50. For instance, if the head address is [47] and 5 indoor units (A, B, C, D, E) are connected, the addresses would be A[47], B[48], C[49], D[50]. Unit E would require address 51, which exceeds the limit and is not available.

3. Switch Setting (Continued)

(3) SW1-8 Setting

Selection: SW1-8

Function: Turn the switch ON when MA remote controller or wireless remote controller is connected to the indoor unit.

Function details:

• ON: MA remote controller or wireless remote controller is connected to the indoor unit. (Initial setting)
• OFF: MA remote controller or wireless remote controller is not connected to the indoor unit. (Not exist)

Initial timing: ON

Effective timing: Always

Diagram description: Shows the SW1-8 switch on the M-NET board. One diagram shows SW1-8 ON, with System controller connected to M-NET board, and Indoor/Outdoor units. It indicates MA/RC connection exists. Another diagram shows SW1-8 OFF, with System controller connected to M-NET board, and Indoor/Outdoor units, indicating MA/RC connection does not exist.

Note: In case of switch is ON, transmission errors between M-NET board and system controllers may not be detected, and the M-NET board operates continuously.

(4) Group Setting Prohibited

Group setting for more than one outdoor unit is not available. (Each outdoor unit is one group.)

[Good example]

Diagram description: Shows a System controller connected to a Power supply unit, then to an Outdoor unit. The Outdoor unit's M-NET board connects to indoor units A through E, each assigned to a group (Group A, Group B, Group C, Group D, Group E). This represents a valid setup where each outdoor unit forms its own group.

[Bad example]

Diagram description: Shows a System controller connected to a Power supply unit, then to an Outdoor unit. The M-NET board attempts to connect indoor units to multiple groups (Group A, Group B). This indicates an invalid configuration where an outdoor unit is incorrectly assigned to multiple groups or multiple outdoor units are attempting to form a single group.

4. Installation Procedure

Applicable model: Group A

[Front view] and [Side view] diagrams are provided.

1. Remove the three screws and remove the control P.C. board holder.
2. Attach ⑦ Lead wire-A to CN5 (Color: White) on the M-NET Board and ⑧ Lead wire-B to CN2M (Color: White) on the M-NET Board.
3. Install the ① M-NET Board (with wires attached) to the back of the control P.C. board holder using the ② Fixture and ③ Screw (M3 x 10).
   • Note: Set the addresses on the ① M-NET Board before installing into the electrical parts box.
   • Note: Be sure that the M-NET board is installed in the correct orientation (so that the CN2M is upwards and CN5 is downwards).
4. Use the three screws removed previously to install the control P.C. board holder in its previous position.
5. Use the ⑤ Terminal screw (M4 x 25) to fix the ④ Terminal block in the position shown in the figure.
   • Note: The Terminal block has a boss for positioning. Align the boss with the positioning hole on the metal plate.
6. Attach ⑥ Label to the position shown in the figure.
7. Refer to the wiring diagram, and connect the ⑦ Lead wire-A (previously connected to CN5) to CN741 (Color: Red) on the control P.C. board.
8. Refer to the wiring diagram, and connect the ⑧ Lead wire-B (previously connected to CN2M) to the M1 and M2 terminals on the ④ Terminal block. There is no polarity difference.
9. Bundle the front and back of the coil sections of ⑧ Lead wire-B using the ⑩ Fasteners as shown in the figure.

(Note 1) If required, connect the shield of the M-NET transmission wire to the main unit using the Ground wire and screw (M4 x8). (See the Caution on page 2)

(Note 2) Take great care that no lead wire is caught on anything when installing panels.

Diagram descriptions for steps: Visuals show the physical components and their placement during installation. Step 1 shows removing the holder. Step 2 shows wire connections to the M-NET board. Step 3 shows mounting the M-NET board. Step 4 shows reattaching the holder. Step 5 shows mounting the terminal block. Step 6 shows placing the label. Step 7 shows connecting Lead wire-A to the control PC board. Step 8 shows connecting Lead wire-B to the terminal block. Step 9 shows bundling wires with fasteners. Notes indicate specific routing ([※1], [※2]) for wires.

Applicable model: Group B

This section details installation steps similar to Group A, with minor differences noted in screw counts and wire routing clips.

1. Remove the two screws and remove the control P.C. board holder.
2. Attach ⑦ Lead wire-A to CN5 (Color: White) on the M-NET Board and ⑧ Lead wire-B to CN2M (Color: White) on the M-NET Board.
3. Install the ① M-NET Board (with wires attached) to the back of the control P.C. board holder.
   • Note: Set the addresses on the ① M-NET Board before installing into the electrical parts box.
   • Note: Be sure that the M-NET board is installed in the correct orientation (so that the CN2M is upwards and CN5 is downwards).
4. Use the two screws removed previously to install the control P.C. board holder in its previous position.
5. Use the ⑤ Terminal screw (M4 x 25) to fix the ④ Terminal block in the position shown in the figure.
   • Note: The Terminal block has a boss for positioning. Align the boss with the positioning hole on the metal plate.
6. Attach ⑥ Label to the position shown in the figure.
7. Refer to the wiring diagram, and connect the ⑦ Lead wire-A (previously connected to CN5) to CN741 (Color: Red) on the control P.C. board.
8. Refer to the wiring diagram, and connect the ⑧ Lead wire-B (previously connected to CN2M) to the M1 and M2 terminals on the ④ Terminal block. There is no polarity difference.
9. Bundle the front and back of the coil sections of ⑧ Lead wire-B using the ⑩ Fasteners as shown in the figure.

(Note 1) If required, connect the shield of the M-NET transmission wire to the main unit using the Ground wire and screw (M4 x8). (See the Caution on page 2)

(Note 2) Take great care that no lead wire is caught on anything when installing panels.

Diagram descriptions for steps: Visuals show the physical components and their placement during installation. Step 1 shows removing the holder. Step 2 shows wire connections to the M-NET board. Step 3 shows mounting the M-NET board. Step 4 shows reattaching the holder. Step 5 shows mounting the terminal block. Step 6 shows placing the label. Step 7 shows connecting Lead wire-A to the control PC board. Step 8 shows connecting Lead wire-B to the terminal block. Step 9 shows bundling wires with fasteners. Notes indicate specific routing ([※1], [※2]) for wires.