Toshiba Concealed Duct Air Conditioner Installation Manual

1 Accessory Parts

This section details the accessory parts included with the installation manual.

Accessory Parts List

Filter Fixing Rails

2 Selection of installation place

WARNING:

• Install the air conditioner at a strong enough place to withstand the unit's weight. Failure may result in injury.
• Install the air conditioner at a height of 2.5 m or more from the floor. Avoid inserting hands or objects into the unit during operation to prevent contact with the fan or electrical components.

CAUTION:

• Do not install in locations where flammable gas may leak. Gas accumulation could lead to ignition.
• When combining with an outdoor unit using R32 refrigerant, ensure the room's floor area meets the minimum requirement specified in the outdoor unit's installation manual.

Avoid installing in the following places

Select a location where air circulates evenly. Avoid:

• Saline areas (coastal areas).
• Locations with acidic or alkaline atmospheres (e.g., near hot springs, chemical/pharmaceutical factories, or where combustion appliance exhaust is drawn in). This can corrode heat exchangers and other parts.
• Locations with mist of cutting oil or machine oil. This can cause corrosion, blockages, damage to plastic parts, and peeling of insulators.
• Places with iron or metal dust, which can spontaneously combust.
• Locations with food oil vapors (e.g., kitchens). Blocked filters can reduce performance and cause condensation.
• Locations near obstructions that disrupt airflow (e.g., ventilation openings, lighting fixtures). This can reduce performance or cause shutdowns.
• Locations using an in-house power generator, as power fluctuations may affect operation.
• Truck cranes, ships, or other moving conveyances.
• Special applications (e.g., storing food, plants, precision instruments, artworks), as item quality may degrade.
• Locations with high-frequency generation (e.g., inverter equipment, medical equipment). This can cause malfunctions or control issues.
• Locations where anything under the unit could be compromised by wetness (e.g., from drain blockage or high humidity causing condensation drips).
• Rooms with inverter-type fluorescent lighting or direct sunlight for wireless systems, as these can interfere with remote controller signals.
• Locations where organic solvents are used, or in chemical plants.
• Locations near doors or windows exposed to high-temperature, high-humidity outdoor air, which may cause condensation.
• Locations where special sprays are used frequently.

Installation under high-humidity atmosphere

In environments with high humidity (dew-point temperature 23°C or higher), such as during the rainy season or in ceilings with tiles/slated roofs, or near fresh air intakes:

• Attach additional heat insulator to all exposed parts of the air conditioner.
• Ensure the side plate (check port) is easily removable.
• Apply sufficient heat insulation to the duct and its connecting parts.

[Reference] Condensation test conditions: Indoor side: 27°C dry bulb, 24°C wet bulb; Air volume: Low; Operation time: 4 hours.

Installation space

Reserve adequate space for installation and service. Diagrams illustrate required clearances for air discharge, inspection openings, and service access (for filter maintenance). Specific dimensions (A, B) are provided for different model series:

• UP005~UP018: A=750mm, B=700mm
• UP024~UP030: A=1050mm, B=500mm
• UP036~UP056: A=1450mm, B=700mm

Filter cleaning sign term setting

The filter cleaning notification term can be adjusted via the remote controller. Refer to the "Filter sign setting" in the Applicable Controls section for setup methods.

3 Installation

CAUTION: Strictly follow these guidelines to prevent unit damage and injury:

• Do not place heavy objects on or allow people to stand on the unit.
• Carry the unit packaged if possible. If carrying unpacked, use protective material.
• When moving the unit, only use the designated hooking brackets (4 positions). Do not apply force to refrigerant pipes, drain pans, foam, or resin parts.
• Carry the unit with two or more people. Do not use plastic bands on unspecified locations.
• Ensure vibration isolation material on hanging bolts does not increase unit vibration.

External dimensions

Diagrams show external dimensions and hanging bolt pitch:

• Main unit dimension (A)
• Hanging bolt pitch (B)
• External dimensions of flange (C, D)

A table provides specific dimensions for models:

• UP005~UP018: A=700mm, B=765mm, C=640mm, D=750mm
• UP024~UP030: A=1000mm, B=1065mm, C=940mm, D=1050mm
• UP036~UP056: A=1400mm, B=1465mm, C=1340mm, D=1450mm

Installation of hanging bolt

Consider piping and wiring when determining unit location and orientation. Install hanging bolts after location is set, referring to external views for pitch dimensions. For existing ceilings, lay drain pipes, refrigerant pipes, and control wires before hanging the unit.

Procure hanging bolts, washers, and nuts separately. Recommended specifications: M10 or W3/8 hanging bolts (4 pcs), M10 or W3/8 nuts (12 pcs), M10 washers (8 pcs).

Installation of indoor unit

Treatment of ceiling: Consult your constructor or interior finish contractor for ceiling structure details. Reinforce ceiling foundation and ensure the installed ceiling is level to prevent vibration.

• Attach nuts and M10 flat washers to hanging bolts.
• Use washers above and below the unit's hanging bracket.
• Check unit is horizontal using a level gauge (within 5 mm tolerance).

REQUIREMENT: Hang the unit horizontally to prevent drain overflow. Install within specified dimensions. Use a level gauge.

Diagrams show front and side views for setting the unit horizontally, ensuring the drain pipe connecting port is lower than the opposite side by up to 5 mm, and air intake/discharge sides are within 5 mm of each other.

Mounting filter rails and filters

1. Mount filter rails, ensuring hooks fit corresponding holes (upper and lower rails are not identical).
2. Mount the filter stopper.
3. Slide and push filters until they stop, inserting them in the direction indicated by arrows.

CAUTION: Push rails until latches click.

Changing from back air intake to under air intake

1. Remove filters from the back of the unit.
2. Remove the suction board cover from the bottom and attach it to the back of the unit.
3. Mount the supplied rail to the bottom and set the filter.

Diagrams illustrate the process, noting that covers for UP0241-UP0301 units are not identical and may need to be reversed.

4 Drain piping

CAUTION: Ensure proper drainage and apply heat insulation to prevent condensation. Improper piping can cause water leakage.

• Provide indoor drain piping and the connection area with proper heat insulation.
• Ensure the drain pipe slopes downward (1/100 or more). Avoid upward runs or traps, which can cause abnormal sounds.
• Limit the traversing drain pipe length to 20 meters. Use support brackets every 1.5 to 2 meters for longer pipes.
• Install collective piping as shown in figures.
• Do not include air vents in the drain pipe.
• Do not apply force to the drain pipe connection area.

Diagrams show correct piping with downward slope and support brackets, and incorrect piping with arched shape or traps.

Pipe material, size and insulator

Locally procured materials are required:

• Pipe material: Hard vinyl chloride pipe VP25 (Nominal outer diameter 32 mm)
• Insulator: Foamed polyethylene foam, thickness: 10 mm or more

Connecting drain pipe

Insert the flexible drain hose into the upper drain pipe of the main unit as far as it will go and secure it with a hose band. Do not use adhesive.

Diagrams show the connection and required dimensions.

Gravitational drainage

1. Reattach the drain cap. For gravitational drainage, remove the white connector (CN504) from the circuit board in the electrical control box.
2. Insert the flexible drain hose into the lower drain pipe and secure it with a hose band.
3. Remove the drain pump connector CN504.

Diagrams illustrate moving the drain cap and the setup.

Drain up

For situations where a down-gradient cannot be secured, drain-up piping is possible:

• The drain pipe height must not exceed 850 mm from the underside of the indoor unit.
• Extend the drain pipe from the indoor unit joint up to 300 mm, then bend it vertically.
• Immediately after the vertical bend, lay the pipe with a down-gradient.

Diagrams show drain up setup dimensions.

Check the draining

During test run, verify proper water drainage and check for leaks at pipe connections. Also, listen for abnormal sounds from the drain pump motor. Check drainage during heating operation as well.

When the electrical and wiring work has been completed

Pour water following the diagram. During cooling operation, check for drainage from the connecting port and for leaks.

When the electrical and wiring work has not been completed

• Disconnect the float switch connector (CN34) before turning off power.
• Connect a 208V-240V supply to (L) and (N) on the power supply terminal block. Do not connect to (Uv (U1)), (Uv (U2)), (A), (B).
• Pour 1500-2000 cc of water.
• The drain pump will start automatically. Check for drainage and leaks.
• After confirming, turn off power, reconnect the float switch connector, and return the electrical control box.

Diagrams show the electrical connections for testing.

5 Duct design

Arrangement

Manufacture ducts locally according to the dimensions provided for different model series (UP005-UP018, UP024-UP030, UP036-UP056) and air intake configurations (Under air intake, Back air intake). Dimensions are given in millimeters.

6 Refrigerant piping

CAUTION: Use only the provided flare nuts to prevent refrigerant gas leakage.

Refrigerant piping

Use seamless phosphorous de-oxidized copper pipe. Wall thickness requirements: 0.8 mm or more for 6.35, 9.52, 12.7 mm; 1.0 mm or more for 15.88 mm.

REQUIREMENT: For long refrigerant pipes, install support brackets every 2.5-3 m to prevent abnormal sounds.

CAUTION: IMPORTANT 4 POINTS FOR PIPING WORK:

1. Mechanical connectors and flared joints are not allowed indoors. Renew sealing parts if reusing mechanical connectors indoors. Re-fabricate flare parts if reusing flared joints indoors.
2. Ensure tight connections between pipes and the unit.
3. Evacuate air from connecting pipes using a vacuum pump.
4. Check for gas leakage at connected points.

Permissible piping length and height difference

These vary depending on the outdoor unit. Refer to the outdoor unit's Installation Manual for details.

Pipe size

A table lists pipe sizes (gas and liquid sides) for different model series:

• UP005 to UP012: Gas 9.5 mm, Liquid 6.4 mm
• UP015 to UP018: Gas 12.7 mm, Liquid 6.4 mm
• UP024 to UP056: Gas 15.9 mm, Liquid 9.5 mm

Connecting refrigerant piping

Flaring

1. Cut pipe with a pipe cutter and remove burrs completely.
2. Insert flare nut and flare the pipe. Use provided flare nuts or those for R32/R410A. Flaring dimensions differ from R22. A new flare tool for R32/R410A is recommended. If using a conventional tool, adjust projection margin as per the table.

Projection margin in flaring (B): 0-0.5 mm for 6.4, 9.5 mm pipes (conventional tool); 1.0-1.5 mm for 12.7, 15.9 mm pipes (conventional tool).

Flaring diameter size (A):

• 6.4 mm pipe: A=9.1 mm (+0/-0.4 mm)
• 9.5 mm pipe: A=13.2 mm (+0/-0.4 mm)
• 12.7 mm pipe: A=16.6 mm (+0/-0.4 mm)
• 15.9 mm pipe: A=19.7 mm (+0/-0.4 mm)

CAUTION: Do not scratch the flared part's inner surface. Check for scratches, deformation, chips, etc. Do not apply refrigerating machine oil to the flare surface.

For R32/R410A with conventional tools, pull out approx. 0.5 mm more than for R22. The sealed gas is at atmospheric pressure; a "whooshing" sound upon flare nut removal is normal.

Work using double spanner

Use specified tightening torques:

• 6.4 mm pipe: 14-18 N·m
• 9.5 mm pipe: 34-42 N·m
• 12.7 mm pipe: 49-61 N·m
• 15.9 mm pipe: 63-77 N·m

R32/R410A pressure is higher. Use a torque wrench. Incorrect connections can cause gas leaks and refrigeration cycle trouble.

CAUTION: Overtightening may crack the nut.

Evacuation

Perform vacuuming from the outdoor unit's charge port using a vacuum pump. Refer to the outdoor unit manual. Do not use the sealed refrigerant for evacuation.

REQUIREMENT: Use tools exclusively for R32 or R410A.

Refrigerant amount to be added

Add R32 or R410A refrigerant as specified in the outdoor unit manual. Use a scale for accurate charging.

REQUIREMENT: Incorrect refrigerant amounts can damage the compressor. Record pipe length and added refrigerant on the F-GAS label.

Airtight test / Air purge, etc.

Refer to the outdoor unit manual for airtight testing, vacuum drying, and refrigerant addition.

CAUTION: Do not supply power to the indoor unit until airtight test and vacuuming are complete.

Open the valve fully

Open the outdoor unit valve fully using a 4 mm hexagonal wrench.

Gas leak check

Check for gas leaks using a leak detector or soap water at pipe connections and valve caps.

REQUIREMENT: Use a leak detector specifically for HFC refrigerants (R32, R134a, R410A, etc.).

7 Electrical connection

WARNING:

• Use specified wires and secure terminals to prevent external forces from causing issues. Incorrect connections can lead to fire or other problems.
• Connect the earth wire properly to prevent electric shock. Do not connect to gas pipes, water pipes, lightning conductors, or telephone earth wires.
• Installation must comply with national wiring regulations. Insufficient capacity or improper installation can cause electric shock or fire.

CAUTION:

• Use wires of the same type and size for communication lines to prevent communication trouble.
• Incorrect wiring can cause electrical fires or smoke.
• Install an earth leakage breaker that is not sensitive to shock waves.
• Use provided cord clamps.
• Do not damage or scratch conductive cores or inner insulation of wires.
• Use power supply and control wires of specified thickness, type, and protective devices.
• Do not connect 208V-240V power to control wiring terminals (Uv (U1)), (Uv (U2)), (A), (B), as this can cause system failure.
• Ensure electrical wiring does not contact high-temperature pipes to prevent coating melt and accidents.

REQUIREMENT:

• Strictly follow local regulations for power supply wiring.
• Follow the outdoor unit manual for outdoor unit power supply wiring.
• Ensure wiring does not contact high-temperature pipes.
• Provide a trap and fix wires with cord clamps after connecting to terminal blocks.
• Run refrigerant piping and control wiring in the same line.
• Do not turn on indoor unit power until refrigerant pipes are vacuumed.

Power supply wire and communication wires specifications

Power supply wire and communication wires are procured locally. Follow the table for power supply specifications. Insufficient capacity can lead to overheating or burnout. Refer to the outdoor unit manual for power capacity and wire specifications.

Indoor unit power supply

• Prepare a separate power supply for the indoor unit, distinct from the outdoor unit.
• Commonly use the power supply, circuit breaker, and main switch for indoor units connected to the same outdoor unit.
• Power supply wire specification: 3-core 2.5 mm² cable, conforming to Design 60245 IEC 57.

8 Applicable controls

REQUIREMENT: Upon first use, allow time for the remote controller to become available after power-on. Automatic address setup may take up to 10 minutes. Outdoor unit operation may take up to 10 minutes after power-on. All units are factory-set to [STANDARD]. Settings may need adjustment using a wired remote controller.

Applicable controls setup (settings at the site)

Remote controller model name: RBC-ASCU11-E

Basic procedure: Stop the air conditioner before making settings.

CAUTION: Only set the Code No. shown in the table. Setting incorrect Code Nos. may result in operational issues or product trouble.

1. Press and hold the Menu and [ ] buttons simultaneously for 10 seconds. The display will show "TEST" for test run permission.
2. Press the [ ] or [ ] buttons to cycle through indoor unit numbers for group control. The fan of the selected unit will run.
3. Press the OFF timer button to confirm the selected indoor unit.
4. Press the Menu button to flash the Code No. [ ], then change it using the [ ] or [ ] buttons.
5. Press the Menu button to flash the Set data [ ], then change it using the [ ] or [ ] buttons.
6. Press the OFF timer button to complete the setup. Repeat from step 4 to change other settings for the selected unit.
7. Press the ON/OFF button to finalize all settings. "SETTING" will flash, then the display will clear, and the unit will enter normal stop mode.

External static pressure settings

Refer to "Fan characteristics" for external static pressure settings. Set tap changes based on duct requirements. Follow the basic operation procedure (1-6). Specify Code No. [5d]. Select SET DATA for external static pressure from the table:

• UP005 to 018: Standard SET DATA values range from 0000 (30 Pa) to 0006 (150 Pa).
• UP024 to 030: Standard SET DATA values range from 0000 (40 Pa) to 0006 (150 Pa).
• UP036 to 056: Standard SET DATA values range from 0000 (50 Pa) to 0006 (150 Pa).

Note: Settings are based on SW501-1 and SW501-2 being OFF. Incorrect settings may cause a "P12" fan motor error.

Setting up on the circuit board of the indoor unit

External static pressure can also be set using DIP switches on the wireless reception part's circuit board or the indoor microcomputer circuit board. Refer to the wireless remote controller kit manual for details.

Filter sign setting

The filter sign notification term can be adjusted based on installation conditions. Follow the basic operation procedure (1-7). Specify Code No. [01]. Select SET DATA for the filter sign term from the table:

• SET DATA: 0000 (None), 0001 (150 H), 0002 (2500 H - Factory default), 0003 (5000 H), 0004 (10000 H).

The filter sign may not be available with all remote controllers.

To secure better effect of heating

To improve heating performance in challenging installations, raise the heating detection temperature. Use circulators or other devices to circulate warm air. Follow the basic operation procedure (1-6). Specify Code No. [06]. Select SET DATA for detection temperature shift from the table:

• SET DATA: 0000 (No shift - Factory default), 0001 (+1°C), 0002 (+2°C), 0003 (+3°C), 0004 (+4°C), 0005 (+5°C), 0006 (+6°C).

Remote controller sensor

To have the remote controller sense room temperature instead of the indoor unit's sensor, follow the basic operation procedure (1-6). Specify Code No. [32]. Select SET DATA from the table:

• SET DATA: 0000 (Not used - Factory default), 0001 (Used).

If the display flashes, the remote controller sensor may be defective. Select [0000] or replace the controller.

Group control

A single remote controller can manage up to 8 or 16 units (depending on the outdoor unit). Only wired remote controllers support group control; wireless controllers do not.

• Refer to "Electrical Connection" for wiring details.
• Connect indoor units' remote controller terminals (A, B) to each other for group wiring.
• Refer to the outdoor unit manual for address setup.

9 Test run

Before test run

• Before power-on, check insulation resistance (1MΩ or more) between terminal block L-N and earth using a 500V insulation tester. Do not run if resistance is below 1MΩ.
• Ensure outdoor unit valves are fully open.
• Leave power on for at least 12 hours before operation to protect the compressor.
• Set addresses according to the outdoor unit's Installation Manual before starting the test run.

Requirements for turning thermostat OFF

• Cooling operation: When outdoor/suction air temperature is ≤ 19°C, or ≤ 3°C above the set temperature.
• Heating operation: When outdoor/suction air temperature is ≤ -10°C, or ≥ 15°C, or ≥ 3°C above the set temperature.

Execute a test run

For fan operation on an individual unit, turn off power, short circuit CN72 on the circuit board, then turn power back on. Set operation mode to "fan". Release CN72 short circuit after the test run.

Operate the unit as usual via the remote controller. Refer to the Owner's Manual for details. A forced test run can be executed even if the unit stops due to thermostat-OFF. The forced test run releases after 60 minutes.

CAUTION: Do not use forced test run for purposes other than testing, as it places excessive load on devices.

Wired remote controller

Stop the air conditioner before making settings.

1. Press and hold OFF timer and [ ] buttons for 10 seconds. "TEST" will appear, permitting test run.
2. Press ON/OFF button.
3. Use the Menu button to select operation mode (Cool or Heat) using [ ] / [ ] buttons, then press Menu three times to confirm. Do not use modes other than Cool or Heat. Temperature setting is disabled during test run. Check codes display normally.
4. After test run, press OFF timer to stop. "TEST" disappears, and the unit returns to normal stop mode.

Wireless remote controller

1. Press and hold the TEMPORARY button for 10 seconds. A "Pi!" sound indicates test run mode. Cooling starts after approx. 3 minutes. Check for cool air. If not starting, check wiring.
2. To stop, press TEMPORARY button once (approx. 1 second). Check wiring/piping.

When a test run is not performed properly

• Refer to "Troubleshooting" for error codes and checks.
• If the external duct is not installed, a protection control (e.g., P12 error) may activate. Select "Low" fan speed or cover the air discharge.
• Stop operation before replacing filters or opening the service panel. Reset the indoor unit circuit breaker after the test run.

10 Maintenance

Periodic Maintenance

Regular cleaning and maintenance of indoor and outdoor units are recommended for efficient operation and extended product life. Annual maintenance is advised for units operated long hours. Check outdoor units for rust/scratches and treat them. For units operating 8+ hours daily, clean every 3 months. Professional cleaning is recommended. Failure to maintain units can lead to poor performance, freezing, water leakage, and compressor failure.

Inspection before maintenance (Once a year)

This inspection should be performed by a qualified installer or service person.

Maintenance List

A table details parts, inspection methods, and maintenance actions:

• Heat exchanger: Check for clogging/damage. Wash if clogged.
• Fan motor: Check for abnormal noise. Take measures if noise occurs.
• Fan: Check for wobbling, damage, or dust. Wash if contaminated, replace if balance is poor.
• Filter: Check for stains or breaks. Wash if contaminated, replace if damaged.
• Drain pan: Check for clogging or polluted drain water. Clean the drain pan and ensure proper slope for drainage.
• Air intake/discharge grilles: Check for dust/dirt.
• Ornamental panel, louvers: Check for dust/dirt, appearance. Wash if contaminated.
• Exterior: Check for dust/dirt, scratches, rust, or peeling insulator. Apply repair coating if needed.

11 Troubleshooting

Confirmation and check

If a problem occurs, the OFF timer indicator will alternately show the check code and the indoor unit number where the problem occurred.

Troubleshooting history and confirmation

You can check the troubleshooting history (up to 4 incidents) during operation or when stopped. Checking history during OFF timer operation cancels the timer.

1. Press and hold the OFF timer button for over 10 seconds to enter troubleshooting history mode. "Service check" will display.
2. The temperature indicator will show "[01: Order of troubleshooting history]". The OFF timer indicator will show the check code and indoor unit number.
3. Press the setting button to cycle through history (newest [01] to oldest [04]).

CAUTION: Do not press the Menu button for over 10 seconds in history mode, as this deletes the entire history.

Press ON/OFF to return to regular mode. If the unit is operating, it will continue until ON/OFF is pressed again.

Check method

Operation status can be monitored via the wired remote controller's LCD, the outdoor unit's 7-segment display, or the wireless remote controller's sensor block display. This self-diagnosis function helps identify errors.

Check code list

A comprehensive list of check codes, their display methods (wired remote, outdoor unit, wireless remote), auxiliary codes, operation status indicators (Operation, Timer, Ready, Flash), check code names, and judging devices (Remote controller, Indoor unit, Inverter, I/F) is provided. This list covers various communication, sensor, motor, compressor, and system faults.

12 Specifications

A table lists specifications for different models:

• Models: MMD-UP0051BHP-E through MMD-UP0561BHP-E
• Sound power level (dBA): Cooling and Heating values marked with '*' (Under 70 dBA).
• Weight (kg) Main unit: Ranges from 23 kg for smaller models to 40 kg for larger models.

13 Notice code

Notice codes are used in TC2U-Link communication to alert users to conditions requiring caution or maintenance. The notice code mark (spanner symbol) will appear on the remote controller or central controller display. The air conditioner can operate normally even when a notice code is displayed. Up to 5 notice codes can be displayed simultaneously.

How to check Notice code No.

1. Stop the air conditioner. Press Menu and OFF timer buttons simultaneously for 10 seconds.
2. The indoor unit number is displayed. Use [ ] / [ ] buttons to change it and press OFF timer to confirm.
3. The history number and Notice code No. are displayed. Use setting buttons to switch history (up to 5 codes).
4. Press ON/OFF to return to the operation stop screen.

Notice code list

• Notice code No. 203: Flow Selector unit battery dead.
• Notice code No. 204: Leak detector life advance display.

Declaration of Conformity

This section includes declarations from CARRIER AIR CONDITIONING (THAILAND) CO., LTD. and Carrier Solutions UK Ltd. regarding the compliance of the Super Modular Multi System Air Conditioner series (including Mini-Super Modular Multi System) with relevant directives and regulations. It lists manufacturer details, TCF holder information, generic denomination, model/type, and commercial names. The declaration is dated May 2, 2024, and states it becomes invalid if unauthorized modifications are made.

14 Appendix

Work instructions

Existing R22 and R410A piping can be reused for inverter R32 product installations, provided certain conditions are met.

WARNING: Confirm pipe strength and condition locally.

Basic conditions needed to reuse existing pipes

Pipes must be:

1. Dry (no moisture inside).
2. Clean (no dust inside).
3. Tight (no refrigerant leaks).

Restrictions for use of existing pipes

Existing pipes should not be reused if:

• There are heavy scratches or dents.
• Pipe thickness is less than specified for R32/R410A.
• The outdoor unit was left disconnected, gas leaked, or pipes were not repaired/refilled, potentially allowing moisture or air ingress.
• Refrigerant cannot be recovered, indicating potential for large amounts of dirty oil or moisture.
• A commercially available dryer is attached, potentially causing copper green rust.
• The existing air conditioner had a history of compressor failure, or oil shows discoloration, residue, metal dust, or bad smell.
• The compressor winding insulation may deteriorate due to incompatible oil types.

Pipe diameter and thickness table: Specifies minimum thickness for R32/R410A pipes based on outer diameter.

Curing of pipes

When opening pipes for extended periods, cure them to prevent rust formation from condensation. Pinching or taping is recommended.

Warnings on Refrigerant Leakage

Check of concentration limit

Rooms must be designed so that refrigerant gas concentration does not exceed set limits in case of leaks. Specific limits apply for R32 and R410A refrigerants, with calculation methods provided.

NOTE 1: For multi-system devices, consider amounts per independent device.

NOTE 2: Standards for minimum room volume are provided, considering partitions and ventilation openings.

NOTE 3: System compliance with IEC60335-2-40 Ed6 is confirmed.

Confirmation of indoor unit setup

Before delivery, check and record the address and setup of each installed indoor unit on a check sheet. This sheet is crucial for post-installation maintenance.

Indoor unit setup check sheet

The check sheet includes fields for Room name, Model, Indoor unit address (Line, Indoor, Group, Central control), and Various setup options (External static pressure, Filter sign lighting time, Detected temp. shift value). It also has sections for checking if specific settings have been changed from default and if optional parts have been incorporated.