Mitsubishi Electric Remote Sensor Installation Manual

1 Safety Precautions

The following symbols denote dangers from incorrect use:

• WARNING: Denotes potential for serious injury or death.
• CAUTION: Denotes potential for personal injury or property damage.

Keep this manual accessible for the final user. Ensure it is forwarded to any subsequent users.

WARNING Precautions:

• Always have your dealer or a technical representative install the unit. Improper installation may lead to electric shock or fire.
• Install in a location strong enough to support the sensor's weight to prevent falls and injury.
• Connect wiring firmly using specified cables. Ensure cables do not exert force on terminals to prevent heat buildup and fire.
• Never modify or repair the sensor yourself. Unauthorized modifications can cause electric shock or fire. Consult your dealer for repairs.
• Ensure installation follows this manual precisely to prevent electric shock or fire.
• All electrical work must be performed by a licensed technician according to local regulations and manual instructions. Incorrect electrical work can cause electric shock or fire.
• Do not move or re-install the sensor yourself. Consult your distributor or a specialized vendor for such services.
• Do not turn on the main power until installation is complete to avoid electric shock or fire.

CAUTION Precautions:

• Do not install in areas with flammable gas leakage, as accumulated gases could cause an explosion.
• Avoid special environments: exposure to oil, steam, or sulfuric gas can significantly degrade performance or damage components.
• Wire the sensor so there is no tension on the cables to prevent breakage, heating, or fire.
• Completely seal the wire lead-in port with putty or similar material to prevent dew, moisture, or insects from entering, which could cause electric shock or malfunction.
• Do not wash the unit with water, as this can cause electric shock or malfunction.
• Do not install where acidic or alkaline solutions or special sprays are frequently used, as this may cause electric shock or malfunction.
• Use standard wires compliant with current capacity. Failure to do so may result in leakage, heating, or fire.
• Do not install in steamy areas like bathrooms or kitchens, or places where moisture condenses into dew, as this may cause electric shock or malfunction.
• Avoid touching the Printed Circuit Board (PCB) with hands or tools. Do not allow dust to accumulate on the PCB, as this could cause fire or electric shock.
• Do not install in locations with temperatures above 40°C or below 0°C, or exposed to direct sunlight.

Additional Precautions:

• If the supply cord is damaged, it must be replaced by the manufacturer, its service agent, or similarly qualified persons to avoid hazards.
• This appliance is not intended for use by persons with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless supervised or instructed by a person responsible for their safety.
• Children should be supervised to ensure they do not play with the appliance.
• This appliance is intended for use by expert or trained users in commercial settings or light industry.

2 Confirming the Supplied Parts

Verify that the following parts are included with this Installation Manual:

• (1) Remote sensor unit: 1
• (2) 2-core cable (12 m): 1
• (3) Wood screw 4.1X16: 2
• (4) Post for connection: 1
• (5) Convert cable: 2

3 How to Install

1. Determine the installation location of the remote sensor (switch box).

   Observe the following:

   • Select a place that detects the average room temperature and is not subject to direct sunlight, heat sources, or airflow from the air conditioner.
   • Install the sensor within the provided cable length (12m). The cable cannot be extended, as this may cause misoperation due to noise.
   • The following parts must be procured at the installation site:
     • Cross-recessed pan head screw (M4)
     • Tow screws
     • Single switch box
     • Thin steel conduit
     • Lock nut, bushing

2. Connect the wires.

   Connect the 2-core cable to the terminal block in the lower case. Peel the sheath of the 2-core cable as shown in Figure 1, and wire it correctly as shown in Figure 2.

   • Figure 1 Description: Illustrates a 2-core cable with its outer sheath, conductor insulation, and conductor. It shows the process of peeling back the outer sheath to expose the insulated conductors.
   • Figure 2 Description: Depicts a terminal block with terminals labeled ELV, ELV. It shows the stripped conductors of the 2-core cable being correctly inserted into these terminals.

   The wiring connection between the indoor unit's electrical box and the remote sensor is shown in Figure 3. There are three connection methods:

   • Method 1: Exchange 2-core cable (connector 20) - Use the connector attached to the end of the 2-core cable as is.
   • Method 2: Connect to terminal block - Cut the connector from the 2-core cable and connect the cable to the terminal block on the I.B. (Indoor Board).
   • Method 3: Use post and convert cable - Utilize the enclosed post for connection and a convert cable.

   These methods vary depending on the indoor unit. If the 2-core cable is to be embedded in the wall, follow Figure 4.

   • Figure 3 Description: Shows wiring connections from the remote sensor to the indoor unit's electrical box. It details three methods: using the existing connector, connecting to the indoor board terminal block, or using a post and convert cable. It also includes a diagram showing cable routing from the rear of the remote sensor to the indoor unit, potentially via thin steel conduit.
   • Figure 4 Description: Illustrates how to embed the 2-core cable in a wall, showing the cable routed from the rear of the remote sensor to the indoor unit.

3. Install the lower case on the wall or switch box.

   Note: The recommended tightening torque for installing the 2-core cable to the terminal block is 1.17 N·m.

   Wiring hole: Refer to step (5) for routing the 2-core cable.

   Installation on wall:

   • Mount the lower case to a flat wall using wood screws.
   • CAUTION: Overtightening screws may break or deform the case. Installing on a bumpy wall may also cause breakage or trouble.
   • Securely seal the wiring lead-in hole with putty or silicone as described in step (6).

   Installation on switch box:

   • Mount the lower case to a single switch box using cross-recessed pan head screws.
   • Ensure the switch box and conduit are properly connected and sealed with putty or silicone as described in step (6).
   • CAUTION: Overtightening screws may break or deform the case.

4. Fit the upper case.

   Catch the two upper claws first and fit the case. Ensure it clicks securely.

   • CAUTION: Securely fit the case until a catching sound is heard. It may drop off if not fitted securely.

   To remove the case, insert a flat-flap screwdriver into the claw section and move it in the direction of the arrow.

   • CAUTION: Do not turn the screwdriver when it is engaged in the claw section, as the claws may break.

5. Wiring hole for direction installation on wall, etc.

   Cut the thin, shaded section of the lower case using a knife or nippers. The 2-core cable connected to the terminal block is led out through this opening.

   • To lead wiring from top of remote sensor: Cut the designated section on the top.
   • To lead wiring from rear of remote sensor: Cut the designated section on the rear.

6. Securely seal the wiring lead hole with putty or silicon.

   This prevents dew, water drops, cockroaches, and other insects from entering.

   • When installing directly on the wall, seal the cut section on the lower case.
   • If wiring passes through a hole in the wall (from the rear), seal that hole.
   • When installing on a switch box, seal the connection between the switch box and conduit.

   Diagram Description for Sealing:

   • Shows sealing the wiring lead-in hole with putty or silicone for both wall and switch box installations. For wall mounting, it shows sealing the cut section of the lower case. For switch box mounting, it shows sealing the connection of the switch box and conduit.

4 Setting of the indoor unit

When the remote sensor is connected and the room temperature detection position is changed, reset the setting of "Set temp. 4-deg. up" in heating mode as follows:

• K control models: Adjust DIP switch Nos. 1-6 on the control PCB of the indoor unit.
• M-NET control models: Adjust DIP switch Nos. 3-8 on the control PCB of the indoor unit.
• A control models: Refer to the A-control air-conditioners SERVICE TECHNICAL GUIDE.

Manufacturer Information

MITSUBISHI ELECTRIC CORPORATION

HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

MANUFACTURER: MITSUBISHI ELECTRIC CORPORATION Air-conditioning & Refrigeration Systems Works

5-66, Tebira 6 Chome, Wakayama-city, 640-8686, Japan