TOSOT SU-COSMO36D/I Ducted Type Indoor Unit User Manual

General Information

Explanation of Symbols

Exception Clauses

TOSOT will bear no responsibilities when personal injury or property loss is caused by the following reasons:

• Damage to the product due to improper use or misuse.
• Alteration, change, maintenance, or use of the product with other equipment without abiding by the manufacturer's instruction manual.
• Defects directly caused by corrosive gas.
• Defects due to improper operation during transportation.
• Operation, repair, and maintenance without abiding by the instruction manual or related regulations.
• Problems or disputes caused by the quality specification or performance of parts and components produced by other manufacturers.
• Damage caused by natural calamities, bad using environment, or force majeure.

Conformity and Range

[Notice Symbol] Please read this user manual carefully before operating the unit and keep it carefully for consultation.

The Refrigerant

This appliance is filled with flammable R-32 gas.

[Notice Symbol] Before using the appliance, read this manual first.

[Notice Symbol] Before installing the appliance, read this manual first.

[Notice Symbol] Before repairing the appliance, read this manual first.

• The air conditioner unit uses R32 refrigerant, which is flammable and odorless. Under certain conditions, it can lead to explosions but has very low flammability, ignitable only by fire.
• R-32 is an environmentally friendly refrigerant that does not harm the ozone layer and has a lower greenhouse effect, contributing to high energy efficiency and reduced maintenance.

[Warning Symbol] The appliance is filled with flammable gas R32.

[Warning Symbol] Installation, operation, and storage must be in a room with a floor area not less than 7.1m² (76.5ft²).

[Warning Symbol] Storage must be in a room without continuously operating ignition sources (e.g., open flames, operating gas or electric heaters).

[Warning Symbol] Storage must be in a well-ventilated area where the room size corresponds to the specified area.

[Warning Symbol] Store to prevent mechanical damage.

[Warning Symbol] Ducts connected to the appliance must not contain an ignition source.

[Warning Symbol] Keep required ventilation openings clear of obstruction.

[Warning Symbol] Do not pierce or burn.

[Warning Symbol] Be aware that refrigerants may not contain an odor.

[Notice Symbol] Do not use means to accelerate defrosting or cleaning other than those recommended by the manufacturer.

[Notice Symbol] Servicing shall be performed only as recommended by the manufacturer.

[Notice Symbol] Repairs by unqualified personnel may be dangerous.

[Notice Symbol] Compliance with national gas regulations shall be observed.

Safety Operation of Flammable Refrigerants

Qualification of Workers

Personnel for maintenance, service, and repair operations should be qualified according to UL 60335-2-40, CAN/CSA-C22.2 No. 60335-2-40: 22 Annex HH. All safety-affecting procedures must be carried out by competent persons according to Annex HH. Special training is required for equipment with FLAMMABLE REFRIGERANTS.

Installation Notes

• The air conditioner must be installed in a room larger than the minimum room area specified on the nameplate or in Table A.
• Drilling holes or burning the connection pipe is not allowed.
• Leak test is mandatory after installation.

Table A - Minimum Room Area (ft²)

Based on UL 60335-2-40 requirements. The following installation height and area are for customer reference.

Maintenance Notes

• Check if the maintenance area or room area meets the nameplate requirements. Operation is only allowed in rooms meeting these requirements.
• Check if the maintenance area is well-ventilated. Continuous ventilation is required during operation.
• Check for fire sources or potential fire sources in the maintenance area. Naked flames are prohibited, and a "no smoking" warning board should be displayed.
• Check if the appliance mark is in good condition. Replace vague or damaged warning marks.

Welding

If cutting or welding refrigerant system pipes during maintenance:

1. Shut down the unit and cut the power supply.
2. Eliminate the refrigerant.
3. Vacuuming.
4. Clean with N₂ gas.
5. Cutting or welding.
6. Carry back to the service spot for welding.

• Refrigerant should be recycled into a specialized storage tank.
• Ensure no naked flame is near the vacuum pump outlet and the area is well-ventilated.

Filling the Refrigerant

• Use specialized filling appliances for R32. Ensure different refrigerants do not contaminate each other.
• Keep the refrigerant tank upright during filling.
• Stick the label on the system after filling.
• Do not overfill.
• After filling, perform leakage detection before test runs. Another leak detection should be done when the system is removed.

Safety Instructions for Transportation and Storage

• Use a flammable gas detector to check before uploading and opening the container.
• No fire source and smoking.
• Comply with local rules and laws.

Safety of Construction

For appliances using FLAMMABLE REFRIGERANTS, all joints in the installation between parts of the REFRIGERATING SYSTEM, with at least one part charged, shall be made in accordance with the following:

• A brazed, welded, or mechanical connection shall be made before opening valves to permit refrigerant flow. A vacuum valve shall be provided to evacuate interconnecting pipes or uncharged REFRIGERATING SYSTEM parts.
• Mechanical connectors used indoors shall comply with ISO 14903. When reused, sealing parts shall be renewed.
• When flared joints are reused indoors, the flare part shall be refabricated.
• Refrigerant tubing shall be protected or enclosed to avoid damage.
• Flexible refrigerant connectors (e.g., connecting lines between indoor and outdoor units) shall be protected against mechanical damage during NORMAL OPERATION.

Pressure Test and Leak Detect

• After field piping for split systems, pressure test with inert gas and then vacuum test prior to refrigerant charging.
• The minimum test pressure for the low side shall be the low side design pressure, and for the high side, the high side design pressure. If the high side cannot be isolated, the entire system shall be pressure tested to the low side design pressure.
• Field-made refrigerant joints indoors shall be tightness tested with a sensitivity of 5 grams per year of refrigerant or better, under a pressure of at least 0.25 times the maximum allowable pressure. No leak shall be detected.

Notices for using refrigerant sensor

• The refrigerant sensor monitors R32 refrigerant leaks in real time. Upon detection, it triggers an alarm, emits a buzzer, displays "EA" on the indoor unit, and stops the outdoor unit.
• In case of refrigerant leakage, open windows immediately for ventilation, check for fire sources, leave the room to a safe place, and contact the after-sales service team for maintenance.
• If the sensor reaches its service life or is damaged, the indoor unit displays "FE". Contact the after-sales service team for replacement.
• Avoid oil and water splashing into the sensor, as it may cause damage.
• Avoid using the sensor in environments with electromagnetic interference, chemical substances, flammable/combustible/explosive gases, or smog.
• Avoid using items containing ethanol (e.g., perfume) and smog-producing items (e.g., cigarettes) near the sensor, as this can cause false alarms. Contact the after-sales service team if this occurs.
• This notice is only applicable to refrigerant sensor models.

Operation and Maintenance

• This appliance is not intended for use or maintenance by persons with reduced physical, sensory, or mental capabilities, or lack of experience/knowledge, unless supervised or instructed by a responsible person.
• Children shall not play with the appliance.
• Cleaning and user maintenance shall not be done by children without supervision.
• Do not connect the air conditioner to a multi-purpose socket, as it may cause a fire hazard.
• Disconnect the power supply before cleaning to avoid electric shock.
• If the supply cord is damaged, it must be replaced by the manufacturer or qualified personnel to avoid hazards.
• Do not wash the air conditioner with water to avoid electric shock.
• Do not spray water on the indoor unit; it may cause electric shock or malfunction. After removing the filter, do not touch the fins to avoid injury.
• Do not use a fire or hair dryer to dry the filter to avoid deformation or fire hazards.
• Maintenance must be performed by qualified professionals; otherwise, it may cause personal injury or damage.
• Do not repair the air conditioner yourself; it may cause electric shock or damage. Contact the dealer for repairs.
• Do not insert fingers or objects into the air inlet or air outlet; it may cause personal injury or damage.
• Do not block the air outlet or air inlet; it may cause malfunction.
• Do not spill water on the remote controller, as it may be broken.
• If any of the following phenomena occur, turn off the air conditioner, disconnect power immediately, and contact qualified professionals:
  • The power cord is overheating or damaged.
  • Abnormal sound during operation, or frequent circuit breaker tripping.
  • The air conditioner gives off a burning smell.
  • The indoor unit is leaking.
• If the air conditioner operates under abnormal conditions, it may cause malfunction, electric shock, or fire hazard.
• When turning the unit on or off using the emergency operation switch, use an insulating object other than metal.
• Do not step on the top panel of the outdoor unit or place heavy objects on it, as it may cause damage or personal injury.
• For appliances made of multiple factory-made assemblies used together, instructions for assembly must be provided by the manufacturer to ensure compliance.

Attachment

• Installation must be performed by qualified professionals.
• Follow electric safety regulations during installation.
• Use a qualified power supply circuit and circuit breaker according to local safety regulations.
• Install a circuit breaker to prevent potential malfunctions.
• A disconnection means must be included in the fixed wiring, following applicable wiring regulations.
• A circuit break with suitable capacity is required. The air switch should include magnet buckle and heating buckle functions for protection against short circuits and overloads.
• The air conditioner must be properly grounded; incorrect grounding may cause electric shock.
• Do not use an unqualified power cord.
• Ensure the power supply matches the air conditioner's requirements. Unstable power supply or incorrect wiring may result in electric shock, fire hazard, or malfunction. Install proper power supply cables before use.
• Connect the live, neutral, and grounding wires of the power socket correctly. Cut off the power supply before any electrical work.
• Do not put through power before installation is finished.
• The refrigerant circuit temperature will be high; keep the interconnection cable away from the copper tube.
• The appliance shall be installed following national wiring regulations, performed by authorized personnel only.
• The air conditioner is a first-class electric appliance and must be properly grounded with a specialized device by a professional. Ensure effective grounding to prevent electric shock. The yellow-green wire is for grounding.
• Grounding resistance must comply with national electric safety regulations.
• The appliance must be positioned so the plug is accessible.
• All wires of the indoor and outdoor units should be connected by a professional. If the power connection wire is insufficient, contact the supplier; do not extend the wire yourself.
• For units with a plug, the plug must be reachable after installation.
• For units without a plug, a circuit breaker must be installed in the line.
• Relocating the air conditioner requires a qualified person to avoid personal injury or damage.
• Select a location out of reach for children and away from animals or plants. Add fencing if unavoidable.
• The indoor unit should be installed close to the wall.
• Before operation, confirm the power specification matches the nameplate.
• Before cleaning or maintenance, turn off the air conditioner and pull out the power plug.
• Ensure the power cord is not pressed by hard objects.
• Do not pull or drag the power cord to remove the plug or move the unit.
• Do not insert or pull out the power plug with wet hands; use grounded power and ensure grounding is reliable.
• When the unit is unattended, turn it off and remove the power plug or disconnect power.
• Do not splash or pour water on the air conditioner; it may cause short circuits or damage.
• Prohibit operating heating equipment around the air conditioner.
• Do not operate the unit in the bathroom or laundry room.
• Keep away from fire sources, flammable, and explosive objects.
• Keep children from playing or climbing on the air conditioner.
• Do not put or hang dripping objects above the air conditioner.
• Do not repair or disassemble the air conditioner yourself.
• Do not block air outlet or air inlet.
• Do not insert any objects into the air conditioner.
• Do not put sundries into the air duct. If sundries enter the duct, contact professionals.
• Do not use an extension cord.
• A fuse or circuit breaker should be added to the product circuit; refer to the MOP value on the nameplate for specifications.
• The appliance shall be installed according to national wiring regulations.
• If a STATIONARY APPLIANCE is not fitted with a SUPPLY CORD and plug, an all-pole disconnection switch with at least 3mm contact separation in all poles should be connected in fixed wiring.
• There should be no ignition source in the air duct.
• Electric heating cannot be added by yourself.

Product Introduction

Names of Key Components

Diagram Fig 2.1.1 shows the indoor unit components. The numbered parts are:

• 1: Drain Pipe
• 2: Control box
• 3: Pothook
• 4: Gas Pipe
• 5: Liquid Pipe
• 6: Air-Return Opening
• 7: Air Outlet
• 8: Filter

Rated Working Condition

The following table details the rated working conditions for cooling and heating:

Preparations for Installation

[Notice Symbol] Product graphics are for reference only. Refer to actual products. Unspecified measure units are mm(in.).

Location for Installation

Diagram Fig 3.2.1 illustrates recommended installation clearances. Key considerations include:

• The appliance shall not be installed in the laundry.
• The top holder must be strong enough to support the unit's weight.
• A drain pipe must allow water to drain out easily.
• Ensure no obstacles at the inlet or outlet for good air circulation.
• Install the indoor unit according to specified dimensions for maintenance space.
• Keep the unit away from heating sources, flammable gas, or smoke.
• This is a concealed ceiling-type unit.
• The indoor unit, outdoor unit, power cord, and electric wire should be at least 1m (39-3/8 in.) from TV sets and radios to avoid image interference and noise. Even at 1m, strong electric waves may cause noise.

Diagram Fig 3.2.1 shows side and top views of the unit installation, indicating clearances such as >300mm (11-13/16 in.) from the wall, >150mm (5-7/8 in.) clearance, and >1000mm (39-3/8 in.) for Air Return.

Wiring Requirements

[Notice Symbol] Installation must be in accordance with National Electric Codes and local regulations.

[Notice Symbol] Improper installation affects performance; use professional technicians.

[Notice Symbol] Do not connect power until all installation work is finished.

1. Power Cord Size and Fuse Capacity

[Notice Symbol] Use copper wire only for the power cord. Operating temperature should be within its value.

[Notice Symbol] If the power cord exceeds 15m (49-1/4 ft.), increase the sectional area to avoid overload.

[Notice Symbol] Power cord size is based on BV single-core wire (2~4pc) at 40°C (104°F) ambient temperature. The air switch is Type D for 40°C (104°F). Adjust capacity based on actual conditions.

[Notice Symbol] Install a cut-off device near the unit. Minimum distance between stages of the cut-off device should be 3mm (1/8 in.).

Installation Instructions

[Notice Symbol] These duct-type indoor units are limited to installation for one room.

Installation of Indoor Unit

Outline Dimension and Installation Spots

Equip with an inspection hatch after lifting the unit. The service port should be on one side of the electric box and below the unit's lower level for maintenance convenience.

Diagrams show the unit's outline dimensions (A, B, C, D, E, F) for different models. For the 36K model:

Diagrams also show the location of the Electric Box (1), Gas Pipe (2), and Liquid Pipe (3).

Suspend the Indoor Unit

1. Drill bolt holes and install bolts:
   • Stick reference cardboard at the installation position. Drill 4 holes according to the cardboard size. Hole diameter depends on the expansion bolt. Depth should be 60-70mm (2-3/8~2-3/4 in.), as shown in Fig 4.1.4.
   • Insert M10 expansion bolt into the hole and knock the nail into the bolt, then remove the paper pattern (Fig 4.1.5).

   [Notice Symbol] Bolt length depends on installation height; bolts are field-supplied.

2. Install the indoor unit temporarily:

   Assemble the suspension bolt onto the expansion bolt. Attach the hanger bracket to the suspension bolt, securing it with a nut and washer from the upper and lower sides. A washer fixing plate prevents the washer from falling (Fig 4.1.6).

   [Notice Symbol] Before operation, prepare all pipelines (connection pipe, drainage hose) and wires (wired controller, indoor unit connection wire).

   [Notice Symbol] When drilling holes in the ceiling, reinforce it if necessary to prevent vibration. Consult the user or builder for details.

   [Notice Symbol] If ceiling strength is poor, install a beam bracket and place the unit on it.

3. Adjust the unit to the right position.
4. Check the level of the unit:

   After installation, check the horizontal status. The unit should be horizontal from front to back and slant 1% from left to right, following the drainage direction (Fig 4.1.8).

5. Remove the washer locating plate and tighten the nut.

Refrigerant Pipe Connection

1. Aim the flaring port of the copper pipe at the center of the screwed joint and tighten the flaring nut by hand (Fig 4.2.1).
2. Tighten the flaring nut with a torque wrench. The torque values are provided in the table based on pipe diameter:

   Pipe Diameter mm(in.)	Torque(N·m)
   Φ6.35(1/4)	15-30
   Φ9-9.52(3/8)	35-40
   Φ12.7(1/2)	45-50
   Φ15.9(5/8)	60-65
   Φ19.05(3/4)	70-75

3. Use pipe bends when bending the pipe; the bending angle should not be too small.
4. Wrap the connection pipe and joint with a sponge and tie them firmly with tape.

Drainage Pipe Installation and Drainage System Testing

Notice for Installation of Drain Pipe

• The drainage pipe should be short and have a downward gradient of at least 1%-2% for smooth condensation water drainage.
• The diameter of the drainage hose should be equal to or larger than the diameter of the drainage pipe joint.
• Install the drainage pipe as shown in Fig 4.3.1, arranging insulation. Improper installation can lead to water leakage and dampness.
• Use normal hard PVC pipe for drainage. During connection, insert the PVC pipe end into the drainage hole and tighten with a wire binder. Do not use glue to connect the drainage hole and pipe.
• When drainage pipelines are used for multiple units, the pipeline position should be about 100mm (4in.) lower than the drainage port of each unit. Thicker pipes may be needed.

Diagram Fig 4.3.1 shows an additional drainage pipe with insulating tape.

Drainage Pipe Installation

1. Insert the drain hose into the drain hole and tighten with tapes (Fig 4.3.2).
2. Tighten the pipe clamp with the screw nut and hose, ensuring the distance between them is less than 4mm (1/8 in.) (Fig 4.3.3).
3. Use a sealing plate to insulate the pipe clamp and hose (Fig 4.3.3).
4. When connecting multiple drain pipes, follow Fig 4.3.4. Choose a drain collecting pipe that matches the unit capacity.

Diagram Fig 4.3.2 shows a metal clamp (1) and drain hose (2). Diagram Fig 4.3.3 shows a metal clamp (1) and thermal sponge (2) with a size constraint ≤ 4(1/8).

Diagram Fig 4.3.4 shows a T Joint of Collecting Pipe with a minimum height requirement of ≥100(3-15/16).

5. Install the trap as shown in Fig 4.3.5.
6. Install one trap for each unit.
7. Consider convenience for cleaning traps when installing them.

Diagram Fig 4.3.5 illustrates trap installation for IDU units.

8. The horizontal pipe can be connected to a vertical pipe on the same level. Connection methods include:
   • a. Drainage pipe joint connection (Fig 4.3.6)
   • b. Downspout elbow connection (Fig 4.3.7)
   • c. Pipe insertion connection (Fig 4.3.8)
9. During installation, ensure the height of the elevated drainage pipe remains within the specified range B. The elevated drain pipe should have a downward slope of at least 1%-2% toward the drainage outlet. If the raising pipe is vertical, the raising height should be less than C.

Diagram Fig 4.3.9 shows an elevated drainage pipe installation with a hanger bracket, indicating height ranges A, B, and C, and a note that the provided drainage pipe is not allowed to bend.

Diagram Fig 4.3.10 shows drain pipes should have a downward slope of at least 1%-2%, with hanger brackets installed at intervals of 1000~1500mm (39-3/8~59 in.) to prevent sagging.

Test of Drainage System

Models with Water Pump

1. Test the drainage system after electrical work is finished. Inject approximately 1L of purified water into the drain pan from the air vent, avoiding electrical components.
• a. Spray 1L water on the evaporator with a sprayer.
• b. After commissioning, energize IDUs and switch to cooling or dry mode. Check draining through the transparent part of the drain socket.
• c. If the communication wire is not connected, communication malfunction "E6" may occur after 3 minutes of energizing. The water pump operates automatically. Check if it drains normally through the drainage port. The pump stops automatically after 1 minute.
2. During the test, carefully check the drainage joint for leakage.
3. It is strongly recommended to perform the drain test before ceiling decoration.

Models without Water Pump

1. Inject water into the water tray of the indoor unit:
   • a. Connect the drain hose to the water tray's drain connection pipe and inject approximately 1L water. Remove the drain hose after testing and replace the water tray plug.
   • b. Spray 1L water on the evaporator with a sprayer.
2. Check if water drains smoothly from the drain pipe and for any leakage on the connection pipe.
3. Arrange insulation for the drain hose and pipe clamp after checking the drain system.

Installation of Air Duct

[Notice Symbol]

• There should be an insulating layer on the air-out duct, air-return duct, and fresh air duct to avoid heat loss and moisture. Adhere a nail on the air duct, add a thermal sponge with a layer of tin, fasten with a nail cover, and seal the junction with tin tape. Other materials with good insulation quality can also be used.
• Each air-out duct and air-return duct should be fixed on a pre-made board with an iron frame. The junction of the air duct should be well-sealed to prevent air leakage.
• The design and construction of air ducts must comply with national requirements.
• The edge of the air-return duct should be at least 150mm (5-7/8 in.) away from the wall. Add a filter to the air-return opening.
• Consider noise-damping and vibration-damping for air duct design and construction. The noise source must be away from people (e.g., do not install air-return openings above user areas like offices or rest areas).

Shape and Size of Air Outlet and Air-return Opening

Diagrams show the Supply Air Outlet and Return Air Inlet dimensions in inches for the 36K model:

Installation of Air-out Duct

Diagram shows the air duct installation with numbered components:

• 1: Hanger Rod
• 2: Return Air Duct
• 3: Canvas Duct
• 4: Return Air Inlet
• 5: Static Pressure Box
• 6: Filter
• 7: Main Supply Air Duct
• 8: Supply Air Outlet

The diagram illustrates return air flow and supply air flow.

Installation of the Return Air Duct

1. The default installation location for the rectangular flange is at the back, and the return air cover plate is at the bottom (Fig 4.4.6).
2. For bottom return air, change the place of the rectangular flange and the return air cover plate.
3. Connect one end of the return air duct to the unit's return air outlet using rivets, and the other end to the return air louver. A cutting of canvas duct can be helpful for adjusting height, reinforced and folded by 8# iron wire.
4. Bottom return air mode may produce more noise than rear return air mode. Installing a silencer and a static pressure box is suggested to minimize noise.
5. Installation methods can be chosen based on building conditions and maintenance needs (Fig 4.4.7).

Diagram Fig 4.4.6 shows the default installation. Diagram Fig 4.4.7 shows different return air duct configurations with numbered components:

• 1: Return Air Inlet (with filter)
• 2: Canvas Duct
• 3: Return Air Duct
• 4: Indoor unit
• 5: Supply Air Duct
• 6: Grille

Installation of the Fresh Air Pipe

1. When connecting the fresh air pipe, cut the fresh air baffle as shown in Fig 4.4.8. Plug any gap in the fresh air baffle with a sponge if the fresh air duct is not used.
2. Install the round flange so the fresh air duct can be connected (Fig 4.4.9).
3. Sealing and heat preservation should be done for both the air pipe and round flange pipe.
4. Fresh air should be treated via the air filter.

Diagram Fig 4.4.8 shows cutting the Fresh Air Baffle. Diagram Fig 4.4.9 shows connecting a Round Air Duct.

Installation of Wired Controller

Refer to the User Manual of the Wired Controller for installation details.

[Notice Symbol] When installation is finished, the unit must be tested and debugged before operation. Refer to the Instruction Manual of ODU for auto-addressing and debugging details.

Wiring Work

[Warning Symbol] Before accessing terminals, all supply circuits must be disconnected.

[Notice Symbol]

• Units must be earthed securely to prevent electric shock.
• Carefully read the wiring diagram before wiring. Incorrect wiring can cause malfunction or damage the unit.
• The unit should be powered by an independent circuit and specific socket.
• Wiring must comply with related regulations for reliable operation.
• Install a circuit breaker for branch circuits according to regulations and electrical standards.
• Keep cables away from refrigerant pipings, compressor, and fan motor.
• Communication wires should be separated from the power cord and connection wire between indoor units.
• Adjust static pressure via the wired controller according to site circumstances.

Connection of Wire and Patch Board Terminal

1. Connection of wire (Fig 5.1.1):
   • a. Strip about 25mm (1 in.) insulation from the wire end using a stripping tool.
   • b. Remove wiring screws on the terminal board.
   • c. Shape the wire tail into a ring using needle nose pliers, matching the screw gauge.
   • d. Tighten the terminal with a screwdriver.
2. Connection of stranded wire (Fig 5.1.2):
   • a. Strip about 10mm (3/8 in.) insulation from the stranded wire end.
   • b. Loosen wiring screws on the terminal board.
   • c. Insert the wire into the ring tongue terminal and tighten with a crimping tool.
   • d. Tighten the terminal with a screwdriver.

Diagram Fig 5.1.1 shows Single Branch Wire preparation. Diagram Fig 5.1.2 shows Multiple Twisted Wire preparation for wiring terminals.

Power Cord Connection

[Notice Symbol]

• Every unit should have a circuit breaker for short-circuit and overload protection.
• During operation, all indoor units connected to the same outdoor unit system must remain energized; otherwise, the unit cannot operate normally.

Diagram Fig 5.2.1 shows the Outdoor Unit Connection wiring, indicating terminals N(1), 2, 3 and wire colors: white (blue), black, red, green (yellow-green).

[Notice Symbol] Indoor unit quantity 'n' is according to the outdoor unit capacity.

For units with single-phase power supply:

1. Detach the electric box lid.
2. Pass the power cord through the wiring holes.
3. Fix the power cord with the wiring clamp.
4. The wire diameter of the power cord must be at least 18AWG.

Wiring of the Signal Line of the Wired Controller

1. Open the cover of the indoor unit's electric box.
2. Let the signal line go through the rubber ring.
3. Insert the signal line into the four-pin socket on the indoor unit's printed circuit board.
4. Fix the signal line with the binding wire.

Setting of External Static Pressure

The working range for external static pressure of this series of duct-type units is 0 Pa~275 Pa. External static pressure settings for indoor fans can be done via a wired controller or debugging software. Refer to the Wired Controller Instruction Manual for specific methods.

The table below shows settings applicable to the 36K model:

Routine Maintenance

Maintenance Before the Seasonal Use

1. Check if the air inlet and air outlet of the indoor and outdoor units are blocked.
2. Check if securely grounded.
3. Check if all power cords and communication cables are securely connected.
4. Check if any error code is displayed after energizing.

Maintenance After the Seasonal Use

1. Set the unit in fan mode for half a day on a sunny day to dry the inner part of the unit.
2. When the unit will not be used for a long time, disconnect the power supply for energy saving. The characters on the wired controller screen will disappear after cutting off the power supply.

Table of Error Codes for Indoor Unit

[Notice Symbol] If there are other error codes, please contact qualified professionals for service.

Troubleshooting

The air conditioner is not expected to be serviced by users. Incorrect repair may cause electric shock or fire. Please contact an authorized service center for professional service. The following checks prior to contact may save your time and money.

[Notice Symbol] If the air conditioner still fails to work normally after checking and handling as described above, stop using it immediately and contact TOSOT for assistance.

Customer Support

Questions? TOSOT is here to help.

Email: support@tosotdirect.com

Website: www.tosotdirect.com

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