MITSUBISHI RC-EX3D Refrigerant Leak Detector Instruction Manual

MITSUBISHI RC-EX3D Refrigerant Leak Detector

Product Information

Specifications

• Model: PJZ012D148 A 202309
• Product Name: Refrigerant Leak Detector
• Compliance: CE, UKCA, EU Directives/Regulations
• Power Supply: 50Hz

Product Usage Instructions

Installation
This manual describes the installation process of the refrigerant leak detector, a safety equipment required for the MHI R32 VRF system. Follow these steps for proper installation:

1. Read the installation manual carefully.
2. Install the detector according to the provided instructions.
3. Use the installation manuals attached to the indoor unit, remote controller, outdoor unit, and shut-off valve in conjunction with this manual.

Safety Precautions
Before starting the installation work, it is crucial to understand and follow the safety precautions outlined below:

• Read the safety precautions carefully.
• Follow each precaution to ensure safety.
• Failure to adhere to safety measures can result in serious injury or death.

FAQ

• Q: What is the purpose of the refrigerant leak detector?
  A: The refrigerant leak detector is a safety measure equipment required for the MHI R32 VRF system to detect leaks and ensure safe operation of the system.

• Q: What should I do if I encounter difficulties during installation?
  A: If you face challenges during installation, refer to the provided manuals for guidance or seek assistance from a qualified technician.

REFRIGERANT LEAK DETECTOR
INSTALLATION MANUAL

This product complies with following directives/regulations

EU

• MD 2006 / 42 / EC
• LVD 2014 / 35 / EU
• EMC 2014 / 30 / EU
• RoHS 2011 / 65 / EU
• Ecodesign 2009 / 125 / EC

GB

• SMR S.I. 2008 / 1597
• EER S.I. 2016 / 1101
• EMC S.I. 2016 / 1091
• RoHS S.I. 2012 / 3032
• Ecodesign S.I. 2020 / 1528

CE and UKCA marking is applicable to the area of 50 Hz power supply

REFRIGERANT LEAK DETECTOR INSTALLATION MANUAL

• This manual describes the way of installing the refrigerant leak detector (hereinafter referred to as the detector). The leak detector is a safety measure equipment required to install on the MHI R32 VRF system.
• When the detector is necessary, install it according to this manual.
• Use it together with installation manuals attached to the indoor unit, remote controller, outdoor unit and shut-off valve.

Regarding safety measure equipment of air-conditioners (refrigerant leak detector) for MHI R32 VRF system

MHI R32 VRF system uses R32 refrigerant.

• R32 refrigerant is categorized as mildly flammable (A2L) by International Standard ISO817. Safety measures specified in safety standard IEC60335-2-40 Ed.6.0. must be observed when installing or using R32 refrigerant equipment. Always install it whenever it is judged necessary to install safety measure equipment.
• It is very dangerous if a refrigerant leak happens by accident when the air-conditioner is used without installation of safety measure equipment (including a detector). It can lead to an explosion if the leak is not detected in the place where an ignition source exists.
• The detector contains sensor to detect refrigerant in air.
• If refrigerant leaks, the detector will inform it to outdoor and indoor units, and other safety measure equipment. The alarm will then be turned on and the operation of each equipment will be controlled for keeping the concentration of refrigerant leaked in the room under the hazard level.

Safety precautions

Read this “Safety precautions” carefully before starting work to install the equipment correctly. Always observe each precaution because it describes important contents for safety.

• WARNING It is highly possible to lead to a significant result such as death or serious injury if it is handled incorrectly.
• CAUTION It is possible to get hurt or cause physical damage.

It could result in significant result depending on situation

“Pictograph” used in the text means as follows.

• User is required to keep it safety where it could be consulted any time.
• Give it to construction workers when equipment is relocated or repaired. When users are changed, give it to new user.

WARNING

•  Shut OFF the main power supply before starting electrical work.
  Otherwise, it could result in electric shocks, break-down or malfunction.

• Do not modify the unit.
  It could cause electric shocks, fire, or break-down.

• Be sure to turn OFF the power circuit breaker before repairing/inspecting the unit.
  Repairing/inspecting the unit with the power circuit breaker turned ON could cause electric shocks or injury.

• Do not install the unit in appropriate environment or where inflammable gas could generate, flow in, accumulate or leak.
  If the unit is used at places where air contains dense oil mist, steam, organic solvent vapor, corrosive gas (ammonium, sulfuric compound, acid, etc.) or where acidic or alkaline solution, special spray, etc. are used, it could cause electric shocks, break-down, smoke or fire as a result of significant deterioration of its performance or corrosion.

• Do not install the unit where water vapor is generated excessively or condensation occurs.
  It could cause electric shocks, fire, or break-down.

• Do not use the unit in a place where it gets wet, such as laundry room.
  It could cause electric shocks, fire, or break-down.

• Do not operate the unit with wet hands.
  It could cause electric shocks.

• Do not wash the unit with water.
  It could cause electric shocks, fire, or break-down.

• Use the specified cables for wiring, and connect them securely with care to protect electronic parts from external forces.
  Improper connections or fixing could cause heat generation, fire, etc.

• Seal the inlet hole for remote control cable with putty.
  If dew, water, insect, etc. enters through the hole, it could cause electric shocks, fire or break-down.
  If dew or water enters the unit, it may cause screen display anomalies.

• When installing the unit at a hospital, telecommunication facility, etc., take measures to suppress electric noises.
  It could cause malfunction or break-down due to hazardous effects on the inverter, private power generator, high frequency medical equipment, radio communication equipment, etc.
  The influences transmitted from the remote control to medical or communication equipment could disrupt medical activities, video broadcasting or cause noise interference.

• Do not leave the refrigerant leak detector with its upper case removed.
  If dew, water, insect, etc. enters through the hole, it could cause electric shocks, fire or break-down.

CAUTION

Do not install the detector at following places.

1. It could cause break-down or deformation of detector.
2. Where it is exposed to direct sunlight
3. Where the ambient temperature becomes 0 °C or below, or 40 °C or above
4. Where the surface is not flat
5. Where the strength of installation area is insufficient
6. Moisture may be attached to internal parts of the detector, resulting in a display failure.
7. Place with high humidity where condensation occurs on the detector
8. Where the detector gets wet
9. Accurate room temperature may not be detected using the temperature sensor of the detector.
10. Where the average room temperature cannot be detected
11. Place near the equipment to generate heat
12. Place affected by outside air in opening/closing the door
13. Place exposed to direct sunlight or wind from air conditioner
14. Where the difference between wall and room temperature is large

Accessories

Following parts are provided.

Following parts are arranged at site. Prepare them according to the respective installation procedures.

directly on a wall. If not embedding the box in a wall, it shall be insulating material of at least 1mm thick for supplementary insulation.
Lacing (JIS C8425 or equivalent)| As required| Necessary to run R/C cable on the wall. It shall be insulating material of at least 1mm thick for supplementary insulation.
Putty| Suitably| For sealing gaps
Molly anchor| As required|
R/C cable (0.3 mm2 x 2 pcs)| As required| See right table when longer than 100 m

When the cable length is longer than 100 m, the max size for wires used in the detector case is 0.5 mm2. Connect them to wires of larger size near the outside of detector. When wires are connected, take measures to prevent water, etc. from entering inside.

Place to install refrigerant leak detector

Install the detector following instructions here.

Place where refrigerant leak can happen
The following places are specified by IEC60335-2-40 Ed.6.0. as the spots with high risks of refrigerant leak.

• A refrigerant system in which a single rupture of the refrigerant circuit results in a refrigerant release to a space, irrespective of the location of the refrigerant circuit. (Direct system)
• Blow outlet, suction inlet of indoor unit.
• Piping joints other than site-made joints directly connecting the indoor unit to the refrigerant piping or factory made mechanical joints in compliance with ISO 14903.

Installation place

• Ensure to meet all the required conditions for setting detectors (shown below).
• The same conditions are required in the case of mechanical joints which are not meeting the standards of ISO14903 and exposed in the room. In this case, refer to ‘mechanical joint’ instead of ‘indoor unit’.
• The refrigerant detection part is within 300 mm above floor (make the height of top face of detector not higher than 420 mm from the floor surface).
• Horizontal distance from the center of the indoor unit is less than 10 m.
• If there is any obstacle such as partition between the indoor unit and the detector, the horizontal distance from the center of the indoor unit must be within 7 m.
• • Address setting of main IU is required when one detector is shared among multiple indoor units. Refer to the installation manual of the remote control (RC-EX3D or later) for detailed setting instructions.

[Ceiling mounted type 1] FDT,FDTC,FDTW,FDTS,FDTQ

[Ceiling mounted type 2/Wall mounted type] FDE,FDK

[With Floor standing type] Floor standing type : FDFW,FDFL,FDFU

• Floor standing type has refrigerant leak detector inside the unit.
• Where a floor standing indoor unit and an indoor unit other than that are installed in the same room, exclude the detector which is built in the floor standing indoor unit and install another detector.

[Duct connected type] FDU,FDUM,FDUT,FDUH,FDU-F

Installation of refrigerant leak detector

• Always fix the refrigerant leak detector on a flat surface of object. Secure the installation space shown in the figure.

• For the installation method, “Embedding wiring” or “exposing wiring” can be selected.

• For the wiring direction, “Backward”, “Upper” or “Lower” can be selected.

• Determine the installation place in consideration of the installation method and wiring direction.
  

• Secure minimum spaces for disassembling the case. Left/Right side…150mm or more

• If using L-shaped screwdriver, 50mm or more is available.

• Perform installation and wiring work for the refrigerant leak detector according to the following procedure.

• To disassemble the refrigerant leak detector case into the upper and lower pieces after assembling them once

  • Insert the tip of flat head screwdriver or the like in the recess (Both side) at the lower part of the refrigerant leak detector and twist it lightly to remove.
  • It is recommended that the tip of the screwdriver be wrapped with tape to avoid damaging the case.
  • Take care to protect the removed upper case from moisture or dust.

In case of Embedding wiring (When the wiring is retrieved “Backward”)

1. Refer to the diagram for wiring end treatment.
   Embed the switch box and the wiring beforehand.　Seal the inlet hole for the wiring with putty.

2. When the wiring are passed through the lower case, fix the lower case at 2 places on the switch box.

3. Connect the wiring from X and Y terminals of the refrigerant leak detector to X and Y terminals of indoor unit.
   The wiring (X, Y) have no polarity. Fix the wiring such that the wiring will run around the terminal screws on the upper case of the refrigerant leak detector.

4. Install the upper case with care not to pinch the wiring.

Cautions for wire connection

• Use wires of no larger than 0.5 mm2 for wiring running through the refrigerant leak detector case. Take care not to pinch the sheath.
• Tighten by hand (0.7 N·m or less) the wire connection.
• If the wire is connected using an electric driver, it may cause failure or deformation.

In case of Exposing wiring (When the wiring is taken out from “Upper” or “Lower”.)

1. Refer to the diagram for wiring end treatment.

2. Cut out the central thin wall sections on the upper case for the wiring.

3. Take care not to damage the PCB and not to leave any chips of cut thin wall inside.

4. It is better to cut off easily if 2 sides (A) in vertical direction are cut with a nipper and a line is dent with a cutter along one side (B) in horizontal direction and the thinner wall section is folded inwards of case.

5. Fix the lower case on a flat surface with two wood screws.

6. Connect the wiring from X and Y terminals of the refrigerant leak detector to X and Y terminals of indoor unit.
   The wiring (X, Y) have no polarity. Fix the wiring such that the wiring will run around the terminal screws on the upper case of the refrigerant leak detector.”

7. Route the wiring as shown in the diagram.

8. Install the upper case with care not to pinch the wiring.

9. Seal the area cut in ② with putty. Prevents foreign matter and moisture from entering.

10. Cover the wiring with the wiring cover. Prevents damage to the detector due to pulling on the wiring.

Wire connection to indoor unit

• The refrigerant leak detector uses the remote control signals.
• Connect the wiring to X and Y terminals of the indoor unit.
• The wiring (X, Y) have no polarity.
• Refer to the installation manual of the indoor unit for connections with other types of units.

Settings of refrigerant leak detector

How to set by detector

• The detector has two Dip SWs. Their functions are as follows. Set them as required.
• The function becomes valid when the power is turned from OFF to ON or CPU of detector is reset, after changing the Dip SW setting.

< Dip SW 1>

| Function| ON| OFF| The original factory state
---|---|---|---|---
SW1-1| Main-sub setting| Refer to the main-sub setting.| OFF
SW1-2| Main-sub setting| OFF
SW1-3| –| –| –| OFF
SW1-4| Inspection mode| Valid| Invalid| OFF

< Dip SW 2>

| Function| ON| OFF| The original factory state
---|---|---|---|---
SW2-1| Alarm sound stop function| Valid| Invalid| ON
SW2-2| Alarm function| Valid| Invalid| ON
SW2-3| Leak detect function| Valid| Invalid| ON
SW2-4| –| –| –| OFF

[Main-sub setting of detectors]

• Up to four detectors, along with the remote control, can be connected to one indoor unit.
• This setting is necessary for the following cases.
  • When the remote controller is not connected.
  • When two or more detectors are connected.
• This setting is not necessary when connecting 1 unit of remote controller and 1 unit of detector. Set the Dip SW 1 (SW1-1, SW1-2) as shown in the following table.

| SW1-1
---|---
ON| OFF
SW1-2| ON| Main| Sub-C
OFF| Sub-A| Sub-B

• Setting as Sub-B in the original factory state.

• When connecting two or more detectors, set them avoiding duplication.

• When the remote controller is not connected to the indoor unit on which the detector is connected, set it as the main (SW1-1: ON/SW1-2: ON). If more than two units are connected, make sure to specify one unit as the main.

• [Setting detector functions]
  When the detector detects refrigerant leak, it turns on the alarm and Error light (Red) to notify the leak. By operating the Dip SWs, the following functions below can be configured.

• < Function to stop the alarm (Dip SW2-1)>

  • This function stops the alarm sound emitted during refrigerant leakage using the switch on the detector. This function is turned on in the original factory state (Dip SW2-1: ON).
  • When this function is turned on (Dip SW2-1: ON), by pushing the switch once while the detector’s alarm is sounding, the alarm sound will stop. Note that this will not stop the flashing of the Error light (red).
  • To turned off the function to stop controlling the alarm sound by switch, Dip SW2-1 into OFF.

• < Alarm function (Dip SW2-2)>

  • This function triggers an alarm sound when refrigerant leakage occurs. The alarm sound level from the detector is approximately 65dB at a distance of 1 meter from the detector. This function is turned on in the original factory state (Dip SW2-2: ON).
  • When other alarms are used for refrigerant leakage alarms, you can turn off the function that sounds an alarm. To turned off this function, Dip SW2-2 to OFF. When the alarm of this detector is turned off, other device to alert the user for refrigerant leak must be installed.

• < Function to detect leak (Dip SW2-3)>

  • This function detects refrigerant leakage. This function is turned on in the original factory state (Dip SW2-3: ON). When using other detectors for refrigerant leakage detection and using this detector solely as an audible alarming device, you can turn off the function to detect refrigerant leakage.
  • To turned off this function, Dip SW2-3 to OFF. When the detection of this detector is turned off, other device to detect refrigerant leak must be installed.

How to set by remote controller

• Each setting of the detector can be made by remote controller (RC-EX3D or later). The administrator password must be entered during setting.
• Tap the Menu User setting ⇒ Administrator settings ⇒ Refrigerant leak detector setting
• The following screen displays of remote controller can change without any announcement. Please refer to the remote controller’s manual for the latest information.

< Controller sound>

• The level of alarm sound for refrigerant leak is adjustable.

• If you set it, the alarm will sound for 3 seconds in the selected sound.

  1. Setting 1: The biggest sound.
     The setting selected in the original factory state.

  2. Setting 2: The sound slightly smaller than

  3. Setting 1. Setting 3: The sound smaller than Setting 1.

< LED brightness>
The brightness of Operation light (Green) that turns on in the detector’s operation is adjustable.

Normal: 100% brightness.
The setting selected in the original factory state.

1. Low 1: 75% brightness.
2. Low 2: 50% brightness.

< Threshold for refrigerant density alarm>
After detecting refrigerant leak, the alarm sound and the flash of Error light (Red) change to notify a decrease in the concentration. The concentration level to turn on the notifications is adjustable.

The patterns of the alarm sound and Error light (Red) are as follows.

| Alarm sound| Error light (Red)| Operation light (Green)
---|---|---|---
When refrigerant leak is detected| Continuous| Continuous flash| OFF
When the concentration of refrigerant inside room decreases| Intermittent| 5 flashes| OFF

I ntermittent sound: Synchronized with flash of Error light (Red ).

• High: The same level as the concentration when refrigerant leak is detected.
  The setting selected in the original factory state.

• Normal: The level of concentration is between High and Low.

• Low: The level of concentration close to the lowest concentration that the detector can sense.

Check the connection of safety equipment

• After installing and connecting safety measure devices, including the detector, check if they are connected correctly. If it is incorrect, it cannot process safety measures correctly when a refrigerant leak is detected.
• After connecting safety measure equipment, make sure to check their connection.
• Unless connection is checked, we cannot take responsibility even if refrigerant leaks during operation without checking connection.
• After confirming that the outdoor units, indoor units, remote controllers, and safety devices (detectors, shut-off valves, ventilation systems, etc.) in the system are properly connected, proceed with the following steps.
• After doing, confirm that the indoor units and other safety devices are functioning properly. Refer to the respective instruction manuals for each device on how to confirm the device operation status.

_ * This is the normal status.
2| Set the outdoor unit to the safety equipment check mode. See the outdoor unit operation manual for setting details.

3

|

• Hold-down the detector’s switch twice. Take three seconds or longer for each time. (See the diagram below) See [Caution for switch operation (P. 16)] in (10) for details.
• • After the switch has been held-down twice, in about one second, the detector sends the connection test signal, an alarm sound goes off, the Operation (green) turns off, and the Error (red) starts to flash continuously.

|

• Statuses of detector’s alarm and light indicators
• If this status is not reached, it is possible that the detector is malfunctioning.
• This is different from the actual state when a refrigerant leak is detected. The operation light (green) turns off when an actual refrigerant leak is detected.
• Error code of the remote control connected to the indoor unit with the detector connected: “E23” is displayed.
• If “E23” is not displayed, there is a possibility of incorrect connection or settings. Check the connection and settings.

4| Push the detector’s switch once. The alarm sound will stop.| Statuses of detector’s alarm and light indicators

5

| Push the detector’s switch three times. The detector sends a signal to return to the original mode, while the Operation (green) lights up and the Error (red) turns off.| Statuses of detector’s alarm and light indicators

• This is the normal status.

6

| Cancel the safety equipment check mode for the outdoor unit.
See the outdoor unit operation manual for setting details.

Refrigerant sensor replacement

• Replace the refrigerant sensor for detection of detector refrigerant 15 years after the start of use. It may not detect properly as a result of aging.
• Even if the air conditioner is not used, the leakage is monitored and the life is counted always while the power is supplied to the air-conditioner.

Notice of refrigerant sensor replacement

• When it lapses 14 years and 6 months, it notifies it is near the replacement period. Then it notifies every month till it reaches 15 years. Report it to your dealer to prepare a new refrigerant sensor.
• If it reaches 15 years, the need of replacement is notified. This continues till it is replaced. Make sure to replace the refrigerant sensor.

| Pre-notice for replacement| Notice for replacement
---|---|---
Notification period| Every month between 14 years and 6 months and 14 years and 11 months| 15 years
Detector| Display| Operation light (green), Error light (red) flash 3 times alternately| Operation light (green), Error light (red) flash alternately continuously.
To stop display| Push detector switch once.| Replace refrigerant sensor
Remote controller (RC-EX3D

or later)

| Display| TOP screen| “Refrigerant sensor replace time is coming.”| “Refrigerant sensor replace time has passed.”
Error history display screen| “M52”| “M51”
Display stop| Refer to remote controller manual.| Refer to remote controller manual.

I/F PCB replacement (Save, transfer of accumulated refrigerant sensor

operation hours)

• When replacing I/F PCB for repair, it is necessary to transfer accumulated operation hours of refrigerant sensor. Accumulated operation hours is saved in I/F PCB. If I/F PCB is replaced, accumulated operation hours is turned to 0 so that replacement period of refrigerant sensor cannot be displayed correctly and specified replacement period could be exceeded.
• When replacing I/F PCB, make sure to transfer the accumulated operation hours of refrigerant sensor to new I/F PCB using the remote controller (RC-EX3D or later).

Save and transfer of accumulated refrigerant sensor operation hours

• Save the accumulated operation hours of refrigerant sensor in remote controller (RC-EX3D or later) and transfer it to new I/F PCB. The service password must be entered during setting.
• button on the TOP screen and select Tap the Menu Service setting ⇒ Service & Maintenance ⇒
• Safety system maintenance Refrigerant leak detector record setting
• Specifications of following remote controller screen are subject to change without notice. For latest information, refer to the manual of remote controller.

[When saving accumulated operation hours in remote controller]
Save it before replacing I/F PCB. [When transferring accumulated operation hours saved in remote controller to I/F PCB]
Transfer it after replacing I/F PCB.

I/F PCB replacement

When installing, removing or operating detector PCB, always turn off the power to the indoor unit. If it is turn on, it could cause electric shock, trouble or improper operation.

1. Save accumulated operation hours of refrigerant sensor in remote controller.

2. Remove the upper case.
   Take care to protect wire connection terminals from undue load. It could damage terminals or PCB.

3. Disconnect wire terminals (2 pcs.) and connector on the I/F PCB.

4. Remove I/F PCB fixing screws (3 pcs.) and take out I/F PCB from the upper case.

5. Install new I/F PCB on the upper case and fix it with screws (3 pcs.).
   Install also the protection sheet.

6. Connect wire terminals on I/F PCB and connector securely. Unless
   it is connected correctly, it cannot detect refrigerant leak.

7. Install the upper case on the lower case.

8. Transfer the accumulated operation hours saved in remote controller to new I/F PCB.

Other

Switch operation
[Kinds of switch operation]

• As the switch is operated, the detector operates accordingly.
• Switch operation and detector operation are as follows.

| Normal mode (Dip SW1-4: OFF)| Inspection mode (Dip SW1-4: ON)| Remark
---|---|---|---
1 push| Alarm stop| Alarm stop| At refrigerant leak detection
Operation (green), Error (red) flash stop| Operation (green), Error (red) flash stop| Near to refrigerant sensor replacement period
2 push| –| –|
3 push| Alarm stop + Error (red) OFF| Alarm stop + Error (red) OFF| At refrigerant leak detection
1 hold-down| –| Accumulated refrigerant sensor operation hours reset| At refrigerant sensor replacement
2 hold-down| Connection check signal ON/OFF| –| At connection check for installation, inspection
3 hold-down| Refrigerant leak detector CPU reset| Refrigerant leak detector CPU reset| –

[Caution for switch operation]

Unless the switch is operated as follows, it does neither recognize the switch operation nor operate as intended. Take care.

1. When it is pushed twice or three times, push interval less than 1 second.
   If it is longer than 1 second, it recognizes less than intended number of times.

2. When holding down, one hold-down needs to be 3 seconds or more.
   If one push of switch is less than 3 seconds, it is not recognized as a hold- down but as normal push.

3. After pushing the switch, the detector starts each operation when hand is released from the switch.
   If the switch is pushed continuously, the detector does not start each operation.
   Other devices than detector start operation 10 and few second after releasing hand from switch at the maximum. It depends on communication condition with each device.

Detector control list

No.| Control| *1

Remote controller display code

| Major start conditions| *2 Operation light (green)| 2 Error light (red)| 3 Alarm| *4 Switch 1 push
---|---|---|---|---|---|---|---
1| Normal| –| Power ON| ON| OFF| OFF| –
2| Refrigerant sensor replacement notice| M52| Every month after using the detector for 14 years and 6 months| 3 flash (alternate)| 3 flash (alternate)| OFF| Light OFF
3| Refrigerant sensor replacement guide| M51| When the detector has been used for 15 years| Continuous flash (alternate)| Continuous flash (alternate)| OFF| –
4| Leak detection| E23| When it exceeds the leak detect density.| OFF| Alarm flash| ON| Alarm OFF
5| Leak density increase| E23| When the density has become approx. 4 times of detection density.| OFF| Alarm flash| ON| –
6| Leak density decrease| E23| When it drops below the density as set with the remote controller.| OFF| 5 flash

(simultaneous)

| Error (red) simultaneous ON| Alarm OFF
7| Buzzer sound volume setting| –| When the buzzer sound volume is set with the remote controller.| Course of events| Course of events| 3 seconds ON| –
8| Safety measure equipment connection check| E23| When it is held down twice.| ON| Alarm flash| ON| Alarm OFF
9| Inspection mode| –| When SW1-4 is ON| Alarm flash| Course of events| Course of events| –
10| Accumulated operation time reset| –| When SW1-4 is ON and the switch is held down once.| Continuous flash| Course of events| Reset ON|

–

11| No registration of indoor unit at power ON| –| When signal is not received for 10 minutes from indoor unit.| 6 flash (simultaneous)| 6 flash (simultaneous)|

OFF

|

–

12| Excessive number of registered indoor units| E10| When more than 17 indoor units are connected.| 3 flash (simultaneous)| 3 flash (simultaneous)| OFF| –
13| Blown thermal sensor wire| E28| When the detection temperature drops below -50°C.| 4 flash (simultaneous)| 4 flash (simultaneous)| OFF| –
14| Defective refrigerant sensor| M11| When the output voltage of refrigerant sensor is 2.53V or more.| 1 flash (Alternate)| 1 flash (Alternate)| Error (red) simultaneous ON| Alarm OFF
15| Refrigerant sensor disconnection| M12| When the output voltage of refrigerant sensor is less than 0.05V.| 2 flash (Alternate)| 2 flash (Alternate)| Error (red) simultaneous ON| Alarm OFF
16| Communication error| M41| When it cannot communicate for 2 minutes with indoor unit.| 5 flash

(simultaneous)

| 5 flash

(simultaneous)

| OFF| –
17| Detector CPU reset| –| When it has been held down 3 times.| Reset flash (simultaneous)| Reset flash (simultaneous)| Reset ON| –
18| Alarm dedicated control|

–

| When SW2-2 is turned ON, SW2- 3 is turned OFF and inputs are received from other device.| OFF| Alarm flash| ON| Alarm OFF

1. Error code or maintenance code displayed on the remote controller
2. Light flashes are as follows.
3. Alarm flash: ON/OFF repeat 2 times per second. Reset flash: Short flash twice
4. Continuous flash: ON/OFF once per second continues. Simultaneous: Operation (green) and Error (red) flash simultaneously.
5. n flash: ON/OFF once per second repeats n times. Alternate: Operation (green) and Error (red) flash alternately.
6. Alarm operations are as follows.
7. OFF: Alarm stop Simultaneous ON: Alarm operates at light ON.
8. ON: Alarm operates continuously. 3 seconds ON: Alarm operates for 3 seconds.
9. Reset ON: Beep
10. The operation when the switch is pushed once during each trouble.

When the detector is not connected to indoor unit

• When using detector without connecting to indoor unit such as when the detector is used only as a alarm, the power is not supplied.
• In such occasion, connect DC18V to detector XY terminal.

About of temperature sensor

• You can change IU main unit return air temperature sensor to the refrigerant leak detector side.

• Regarding the setting method, refer to the Installation Manual of the remote controller (RC-EX3D or later).

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  • https://www.mhiaa.com.au

• MITSUBISHI HEAVY INDUSTRIES – MAHAJAK AIR CONDITIONERS CO., LTD.

  • 220 Lad Krabang Industrial Estate Free Zone 3, Soi Chalongkrung 31, Kwang Lamplatiew, Khet Lad Krabang, Bangkok 10520, Thailand
  • Tel : +66-2-326-0401
  • Fax : +66-2-326-0419
  • https://www.mhi.com/group/maco/

References

• 冷熱製品サイト｜三菱重工サーマルシステムズ株式会社
• MITSUBISHI HEAVY INDUSTRIES - MAHAJAK AIR CONDITIONERS CO.,LTD.
• Home - Mitsubishi Heavy Industries Air-Conditioners Australia

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