Toshiba Air Conditioner Installation Manual

Model Information

Indoor Unit Models: RAS-B18, 22, 24G3KVSG-E, RAS-B18, 22, 24G3KVSGB-E

Outdoor Unit Models: RAS-18J2AVSG-E1, RAS-22J2AVSG-E1, RAS-24J2AVSG-E1

Refrigerant Type: R32 or R410A

Document Reference Number: 1144350101

Precautions for Safety

Read all precautions carefully before operating the unit.

Warning Indications:

• CAUTION: Indicates potential for personal injury or property damage.
• DANGER: Indicates severe injury or death if precautions are not followed.
• WARNING: Indicates potential for severe injury or death.

General Safety Notes:

• This appliance is filled with R32 refrigerant.
• Follow all safety precautions to avoid risks.
• Use only qualified persons for installation and electrical work.
• Ensure the main power supply is OFF before any electrical work.
• Verify correct connection of the connecting cable and the earth wire.
• Do not install near combustible gas or gas vapors to prevent fire or explosion.
• Keep the indoor unit away from heat sources (radiators, heaters, etc.) to prevent overheating and fire hazards.
• When moving the unit, be careful not to introduce other gases into the refrigerant cycle, as this can cause high pressure and pipe bursts.
• In case of refrigerant gas leak, ensure adequate ventilation.
• Never modify the unit by bypassing safety guards or interlock switches.
• Ensure the installation location can bear the unit's weight to prevent falls.
• Use an approved plug and ensure the equipment is properly earthed.
• Install in accordance with national wiring regulations.
• Do not use refrigerants other than the specified type to avoid abnormal pressure generation, failure, or explosion.
• Do not use means to accelerate defrosting or cleaning other than those recommended.
• Store the appliance in a room without continuously operating ignition sources.
• Be aware that refrigerants may be odorless.
• Do not pierce or burn the pressurized appliance; avoid exposure to heat, flame, sparks, or ignition sources.
• A special tool is required for R32 or R410A refrigerant installation.
• Copper pipes for R32 must be thicker than 0.8 mm.
• After installation, confirm there is no refrigerant leakage.
• Comply with national gas regulations.
• After installation work, ensure pipes are connected properly and valves are fully open. Running the compressor without open valves can cause high pressure and parts failure.
• During pump down work, do not mix air into the refrigerant cycle. Stop the compressor before removing piping after packed valves are fully closed.

CAUTION:

• Exposure to water or moisture before installation can result in electric shock. Do not store in wet areas or expose to rain.
• Examine the unit for damage after unpacking.
• Do not install where flammable gas may leak, as it can cause fire.
• Avoid locations that increase vibration or amplify noise levels.
• Handle parts with sharp edges carefully to avoid personal injury.
• Read the entire manual for proper installation instructions.
• The manufacturer is not liable for damage caused by not observing the manual.

Requirement of Report to the Local Power Supplier:

Report installation to the local power supplier before installation. Contact the service agency if there are problems or the installation is not accepted.

Important Information Regarding Refrigerant:

This product contains fluorinated greenhouse gases (R32). Do not vent gases into the atmosphere. GWP value: 675 (based on F gas regulation 517/2014).

Accessory Parts

Indoor Unit Accessories:

Outdoor Unit Accessories:

Air Filters:

Clean every 2 weeks. Open air inlet grille, remove filters, vacuum or wash and dry, then reinstall.

Filter Maintenance & Shelf-life:

Clean every 3-6 months. Use vacuum or blower for cleaning. Washing with water is possible but may reduce performance. Replace every 2 years or sooner. Filter life depends on environmental impurities.

Installation Diagram of Indoor and Outdoor Units

This section details the physical placement and connections between the indoor and outdoor units. Key aspects include:

• Indoor Unit Placement: Requires specific clearances around air inlet/outlet, space for front panel opening, and a minimum height of 2.5m. Avoid direct sunlight on the wireless receiver and proximity to RF noise sources.
• Remote Control Placement: Should not be obstructed by curtains and should be kept at least 1m away from TVs or stereo equipment.
• Cutting Holes: Instructions for creating pipe holes in the wall, ensuring a slight downward slant towards the outdoor side. A pipe hole brim ring may be needed for metal lath walls.
• Mounting Installation Plate: Secure the plate horizontally to the wall using screws or anchor bolts. Ensure firm installation to prevent unit falls.
• Piping and Drain Hose Installation: Pipes must be insulated. Drain hoses should slope downwards without kinks or sags. Ensure proper drainage to prevent dew-dropping.
• Indoor Unit Fixing: Hook the unit onto the installation plate, first at the upper hook, then secure the lower part.
• Outdoor Unit Fixing: Secure the outdoor unit with anchor bolts (Ø8 mm or Ø10 mm) if exposed to strong winds. Attach drain nipple and cap water proof if defrost water drainage is required.
• Optional Installation Parts: Refrigerant piping (Liquid side: Ø6.35 mm, Gas side: Ø12.70 mm), pipe insulating material (8 mm thick polyethylene foam), and putty/PVC tapes are listed.
• Fixing Bolt Arrangement: Diagrams show typical bolt placements for outdoor units.
• Allowable Pipe Lengths: Specifications for maximum pipe length and additional refrigerant charging based on model and length.
• Allowable Height: Maximum installation height for outdoor units based on model.
• Precautions for Windy Areas: Use windshields or ducts for normal fan operation in windy locations. Avoid direct wind admission.
• Locations to Avoid: Do not install in places with machine oil, saline environments, sulfide gas, or high-frequency waves (audio equipment, welders, medical equipment).
• Precautions for Snowfall and Cold Temperatures: Use drain holes directly, install holding frames, and snow protection hoods/plates.

Outdoor Unit Installation Details

Installation Place:

Choose a location with adequate space, capable of supporting the unit's weight, minimizing noise and air disturbance, protected from strong winds and combustible gases, and not blocking passages. Ensure feet are secured if installed in an elevated position.

Precautions for Adding Refrigerant:

Use a scale with at least 10g precision. Do not use bathroom scales.

Draining the Water:

Holes in the base plate allow defrost water drainage. For centralized drainage, install water-proof rubber caps in the elongated holes. Install a drain nipple and a commercially available drain hose (16 mm ID), ensuring a downward slope.

Refrigerant Piping Connection:

Flaring: Cut pipes with a pipe cutter. Flare the pipe using appropriate tools, ensuring correct projection margin (A). Use R32/R410A specific tools for flaring. Thickness of copper pipes must be 0.8 mm or more.

CAUTION: Do not scratch the inner surface of the flared part during burr removal, as this can cause refrigerant gas leaks.

Tightening Connection: Align pipe centers, tighten flare nuts by hand, then use a spanner and torque wrench. Do not apply excess torque.

Tightening Torque: Specific torque values are provided for different copper pipe diameters (Ø6.35 mm, Ø9.52 mm, Ø12.70 mm).

Note: Operating pressure for R32/R410A is higher than R22. Ensure firm tightening of flare pipe connections to the specified torque to prevent gas leakage and damage.

Evacuating:

After piping connection, perform air purge using a vacuum pump. Use a pump with counter-flow prevention. Connect charge hose to service port and vacuum pump. Open low pressure handle, operate pump until -101 kPa (-76 cmHg) is reached. Close low pressure valve, open packed valves, remove hose, and tighten caps.

Packed Valve Handling Precautions: Open valve stem fully but not beyond the stopper. Specific hexagon wrench sizes are required for different pipe sizes.

Pump Down Process: Turn off the system, connect manifold valve, run cooling operation for 10+ minutes, check pressure. Close liquid side valve, continue operation until gauge drops to 0.5-0 kgf/cm², then close gas side valve and turn off the system. Remove manifold and tighten caps.

CAUTION: Monitor compressor operation during pump down for abnormal sound or vibration. Tighten valve caps to specified torque.

Important Piping Work Points: Remove dust/moisture, tighten connections, evacuate air, check for gas leaks, open packed valves fully, avoid reusing mechanical connectors/fared joints indoors (renew sealing parts/refabricate fare parts), and do not operate without refrigerant.

Electrical Works

Power Supply: Choose connection to indoor or outdoor unit. Specifications for power source, running current, circuit breaker rating, and cable types (H07RN-F or 60245 IEC66, 2.5 mm² or more) are provided for different models.

Wiring Connection:

Indoor Unit: Remove air inlet grille, terminal cover, and cord clamp. Insert connecting cable into pipe hole, route it, connect to terminal block, and secure with screws (torque: 1.2 N·m). Secure cable with cord clamp. Reattach covers.

Outdoor Unit: Remove valve cover, electric parts cover, and cord clamp. Connect connecting cable to terminals matching indoor unit. Insert power cord and connecting cable into terminal block, secure with screws. Insulate unused cords. Secure cords with clamp. Reattach covers.

In Case of Indoor Unit Connect With 1:1 Outdoor Unit:

Details on power supply input at the outdoor unit terminal block (recommended) and indoor unit terminal block (optional). Includes diagrams showing cable connections and stripping lengths for connecting cable and power supply cable.

Power Supply Input Wiring Diagram for 1:1 Outdoor Unit:

Diagrams illustrate recommended power input at the outdoor terminal block and optional input at the indoor terminal block, showing connections to chassis and grounding.

CAUTION: Ensure power supply matches unit rating, use a dedicated circuit breaker, comply with wiring methods, connect wires firmly, and ensure proper wiring capacity. Incorrect wiring can cause burnout, ignition, or smoke. Fixed wiring requires a switch with at least 3 mm contact separation.

In Case of Indoor Unit Connect With Inverter Multi System (IMS):

Details on power supply input at the outdoor unit terminal block for IMS, including diagrams for connecting cable and wiring.

Power Supply Input Wiring Diagram for Inverter Multi System (IMS):

Diagram illustrates power input at the outdoor terminal block for IMS, showing connections.

CAUTION: Similar precautions as for 1:1 connection apply regarding power supply, circuit breakers, wiring, and safety.

Others

Gas Leak Test:

Check indoor and outdoor unit connection points for gas leaks using a gas leak detector or soap water.

Remote Control A-B Selection:

For rooms with multiple indoor units, set one remote control to 'B' to prevent simultaneous operation. Factory default is 'A'. Instructions are provided to set Remote Control to 'B' (press RESET, point remote, hold U, press MODE) or reset to 'A'. Adhere the 'B' label when setting to 'B'.

Test Operation:

To switch to TEST RUN (COOL) mode, press the [RESET] button for 10 seconds. A short beep will sound.

Auto Restart Function Setting:

The product restarts automatically after a power failure in the same operating mode. The function is shipped ON. To turn OFF, press and hold [OPERATION] for 3 seconds (3 beeps, no blink). To turn ON, press and hold [OPERATION] for 3 seconds (3 beeps, OPERATION lamp blinks). AUTO RESTART does not activate if ON/OFF timers are set.

Appendix

Work Instructions:

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

WARNING:

Confirm existing pipes for scratches, dents, and strength reliability. If conditions are met, existing pipes can be updated for R32 models.

Basic Conditions for Reusing Existing Pipes:

Pipes must be dry (no moisture), clean (no dust), and tight (no refrigerant leaks).

Restrictions for Use of Existing Pipes:

• Do not reuse if scratches or dents are heavy.
• Do not reuse if pipe thickness is less than specified. (R32/R410A operating pressure is higher than R22.)
• Do not reuse if outdoor unit was left with disconnected pipes, gas leaked, and not repaired/refilled, as moisture/air may enter.
• Do not reuse if refrigerant cannot be recovered, indicating potential for dirty oil or moisture.
• Do not reuse if a commercially available dryer is attached, as copper green rust may form.
• Check oil condition after removing existing AC. If oil is discolored (green, black), has residue, bad smell, or metal dust, it indicates potential issues.
• Do not reuse if the compressor has a history of failure and replacement.
• Do not reuse if the unit has been temporarily installed/removed repeatedly.
• Do not reuse if the refrigerator oil type is different from specified oils (Mineral oil, Suniso, Freol-S, MS, alkyl benzene, ester series, PVE).

NOTE: These descriptions are based on Toshiba's findings and do not guarantee reuse of pipes from other manufacturers' R32/R410A units.

Curing of Pipes:

To prevent rust from condensation, cure pipes when units are removed for extended periods. Pinching or taping is recommended for less than 1 month, pinching for 1 month or more. Outdoor units require curing.

Pipe Reuse Flowchart:

A decision tree guides whether existing pipes can be reused based on scratches/dents, operability of the existing AC, and oil condition after refrigerant recovery and flushing.

Piping Flare Nut/Machining Size:

Tables provide specifications for flare nut width (H) and flare machining size (A) for R32/R410A and R22, noting that R32/R410A sizes may be slightly larger. Do not apply refrigerator oil to the flare surface.