45MBAAQ Split-Type Air Handler Indoor Unit Ductless System Owner's Manual

Note to Equipment Owner

Please read this Owner's Information Manual carefully before installing and using this appliance and keep this manual for future reference.

For your convenience, please record the model and serial numbers of your new equipment in the spaces provided. This information, along with the installation data and dealer contact information, will be helpful should your system require maintenance or service.

Unit Information

• Model #: ____________________
• Serial #: ____________________

Installation Information

• Date Installed: ____________________

Dealership Contact Information

• Company Name: ____________________
• Address: ____________________
• Phone Number: ____________________
• Technician Name: ____________________

Specifications subject to change without notice.

A Note About Safety

This is the safety-alert symbol: ⚠ (Unicode for Warning Sign). Anytime you see this symbol in manuals, instructions, and on the unit, be aware of the potential for personal injury. There are three levels of precaution:

1. DANGER identifies the most serious hazards which will result in severe personal injury or death.
2. WARNING signifies hazards which could result in personal injury or death.
3. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage.

NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.

General Operation

The indoor unit provides quiet, maximum comfort. In addition to cooling and/or heating, it filters and dehumidifies the air. The indoor unit should be installed by authorized personnel only. It can be set up and operated from the remote control. If the remote is misplaced, the system can be operated from the "Auto" setting on the unit.

Operating Modes:

• FAN Only: Filters and circulates room air without changing temperature.
• AUTO: Automatically cools or heats according to the user-selected set point. Recommended for single zone applications.
• HEATING: Heats and filters room air (heat pumps only). System's priority mode; simultaneous heating and cooling is not allowed.
• COOLING: Cools, dries, and filters room air.
• DEHUMIDIFICATION (DRY): Dries, filters, and slightly cools room air. Prioritizes air dehumidification but does not replace a dedicated dehumidifier.

FCC Compliance

This device complies with part 15 of the FCC Rules. Operation is subject to two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation.

For Class B Digital Device

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. If this equipment does cause harmful interference to radio or television reception, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the distance between the equipment and the receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for assistance.

MODIFICATION: Any changes or modifications not expressly approved by the grantee of this device could void the user's authority to operate this device.

Refrigerant Charge Amount vs. Minimum Room Area (Table 1 Summary)

This table provides guidelines for the minimum room area required based on the refrigerant charge amount (in pounds and kilograms) to ensure safety with flammable refrigerants. For example, a charge of 3.91 lbs (1.776 kg) requires a minimum room area of 12 ft² (1.10 m²), while a charge of 19.8 lbs (9.0 kg) requires 298 ft² (27.64 m²).

Compatibility and Airflow Information

Compatibility Table (Table 2 Summary)

This table outlines the compatibility of various 45MBAAQ indoor unit models (18K, 24K, 30K, 36K) with different multi-zone and single-zone heat pump outdoor units (e.g., 37MGRAQ, 37MGHAQ, 37MAHAQ, 37MARAQ, 37MBHAQ, 37MBRAQ series). A dot (•) indicates compatibility between specific indoor and outdoor unit models.

Airflow Information (Table 3 Summary)

When the unit detects a refrigerant leak, the minimum airflow of the unit is adjusted. The table provides nominal air volume (CFM and m³/h) for different models:

• 18K, 24K: 400CFM (680m³/h)
• 30K: 447CFM (760m³/h)
• 36K: 541CFM (920m³/h)
• 48K: 706CFM (1200m³/h)
• 60K: 795CFM (1350m³/h)

Room Size Restrictions

Appliances are connected via an air duct system to one or more rooms. The air outlet of the air duct in the room should be at a height of ≥7.3ft/2.2m from the floor. The R454B refrigerant is mildly flammable, limiting the room area for system service. The total refrigerant amount must be less than or equal to the maximum allowable refrigerant charge, which depends on the room area serviced.

Installation and Servicing Guidelines

1. Installation (where refrigerant pipes are allowed)

• Personnel involved with refrigerant circuits must hold a current, valid industry-accredited certificate.
• Maintenance and repair with other skilled personnel must be supervised by someone competent in flammable refrigerants.
• Pipe-work must be kept to a minimum and protected from physical damage, complying with national gas regulations.
• Mechanical connections must be accessible for maintenance.
• Prevent foreign matter (oil, water) from entering piping; seal openings securely during storage.
• Appliance must be stored in a well-ventilated area corresponding to the room size specified for operation.
• Joints must be tested with detection equipment (sensitivity of 5 g/year or better) in standstill and operation conditions after installation. Detachable joints are NOT to be used on the indoor side of the unit (brazed, welded joints are permissible).
• Mechanical ventilation openings must remain clear of obstruction.

2. When a Flammable Refrigerant is Used

Installation space and ventilation requirements are determined by mass charge amount, installation location, and appliance type.

• Piping material, routing, and installation must protect against physical damage, comply with national and local codes (e.g., ASHRAE 15, IAPMO Uniform Mechanical Code, ICC International Mechanical Code, CSA B52). Field joints must be accessible for inspection.
• Protection devices, piping, and fittings must be protected against adverse environmental effects (e.g., water collection, freezing in relief pipes, dirt accumulation).
• Refrigeration system piping must minimize hydraulic shock damage.
• Steel pipes and components must be rustproof coated before insulation.
• Precautions must be taken to avoid excessive vibration or pulsation.
• Minimum floor area of the room must be specified (table or single figure).
• After field piping for split systems, pressure test with inert gas, then vacuum test prior to refrigerant charging:
  1. Minimum test pressure for low side must be low side design pressure; for high side, high side design pressure. If high side cannot be isolated, test entire system to low side design pressure.
  2. Test pressure after removal of pressure source must be maintained for at least 1 hour with no decrease indicated by gauge (resolution not exceeding 5%).
  3. During evacuation test, after achieving specified vacuum level, isolate system from vacuum pump; pressure must not rise above 1500 microns within 10 minutes. Vacuum pressure level must be specified in the manual, lesser of 500 microns or national/local code requirements.
  4. Field-made refrigerant joints indoors must be tightness tested with sensitivity of 5 grams per year or better under pressure of at least 0.25 times maximum allowable pressure. No leak detected.
• Servicing must only be performed as recommended by the manufacturer.

3. Qualification of Workers

All maintenance, service, and repair operations must be performed by qualified personnel. Working procedures affecting safety must be carried out by competent persons with documented training and competence. Training should follow ANNEX HH requirements of UL 60335-2-40 4th Edition. Examples include breaking into refrigerating circuit, opening sealed components, or opening ventilated enclosures.

Information Servicing

1. Checks to the Area

Prior to work on systems with flammable refrigerants, safety checks are necessary to minimize ignition risk. Precautions must be complied with before conducting work.

2. Work Procedure

Works must be undertaken under a controlled procedure to minimize flammable gas or vapor presence.

3. General Work Area

All maintenance staff and others in the local area must be instructed on the nature of work. Confined spaces must be avoided.

4. Checking for Presence of Refrigerant

The area must be checked with an appropriate refrigerant detector prior to and during work to ensure awareness of potentially flammable atmospheres. Leak detection equipment must be suitable for flammable refrigerants (no sparking, adequately sealed, intrinsically safe).

5. Presence of Fire Extinguisher

If hot work is conducted on refrigeration equipment, appropriate fire extinguishing equipment (dry power or CO2) must be available adjacent to the charging area.

6. No Ignition Sources

No person working on a refrigerating system involving exposed pipe work shall use ignition sources that could lead to fire or explosion. All possible ignition sources, including cigarette smoking, must be kept far from the site. The area must be surveyed for flammable hazards or ignition risks before work. "No Smoking" signs must be displayed.

7. Ventilated Area

Ensure the area is open or adequately ventilated before breaking into the system or conducting hot work. Ventilation should continue during work to safely disperse released refrigerant externally.

8. Checks to the Refrigeration Equipment

Electrical components must be fit for purpose and correct specification. Manufacturer's guidelines must be followed. Checks for flammable refrigerant installations include:

• Actual refrigerant charge is in accordance with room size.
• Ventilation machinery and outlets are operating adequately and unobstructed.
• Secondary circuits checked for refrigerant presence if an indirect circuit is used.
• Equipment marking is visible and legible.
• Refrigeration pipe or components are installed to avoid corrosion from substances, or are constructed of resistant materials.

9. Checks to Electrical Devices

Repair and maintenance of electrical components include initial safety checks and component inspection. If a fault compromises safety, no electrical supply until dealt with. If temporary solution is used, report to equipment owner. Initial safety checks include:

• Capacitors are discharged safely to avoid sparking.
• No live electrical components/wiring exposed during charging, recovering, or purging.
• Continuity of earth bonding.

10. Sealed Electrical Components

Must be replaced.

11. Intrinsically Safe Components

Must be replaced.

12. Cabling

Check cabling for wear, corrosion, excessive pressure, vibration, sharp edges, or other adverse environmental effects. Consider aging and continuous vibration from compressors/fans.

13. Detection of Flammable Refrigerants

No potential ignition sources (e.g., halide torch, naked flame) for leak detection. Acceptable methods include electronic leak detectors (calibrated in refrigerant-free area, suitable for refrigerant used, set at 25% LFL maximum) and leak detection fluids (avoid chlorine-containing detergents). If leak suspected, remove/extinguish all naked flames. If brazing is required, recover or isolate all refrigerant. See removal instructions.

14. Removal and Evacuation

Conventional procedures apply, but for flammable refrigerants, best practice is crucial. Adhere to:

• Safely remove refrigerant per local/national regulations.
• Evacuate.
• Purge circuit with inert gas (optional for A2L).
• Evacuate (optional for A2L).
• Continuously flush/purge with inert gas when using flame to open circuit; then open circuit.

Recover refrigerant into correct recovery cylinders if venting is not allowed. For flammable refrigerants, purge system with oxygen-free nitrogen (repeat if needed). Do not use compressed air or oxygen for purging. Purging is achieved by breaking vacuum with oxygen-free nitrogen, filling to working pressure, venting to atmosphere, and pulling down to vacuum (repeat until no refrigerant remains). Final oxygen-free nitrogen charge is vented to atmospheric pressure for work. Vacuum pump outlet must not be near ignition sources; ventilation must be available.

15. Charging Procedures

In addition to conventional procedures:

• Use appropriate tools for flammable refrigerants.
• Prevent contamination of different refrigerants; use shortest possible hoses.
• Cylinders must be kept upright.
• Refrigeration system must be earthed before charging.
• Label system when charging is complete.
• Do not overfill cylinders.
• Pressure test with oxygen-free nitrogen (OFN) before recharging; leak test after charging and before commissioning; follow-up leak test before leaving site.

16. Decommissioning

Technician must be familiar with equipment. Recover refrigerants safely. Take oil/refrigerant sample if analysis needed. Electrical power must be available. Before procedure:

• Ensure mechanical handling equipment, PPE, and competent supervision are available.
• Recovery equipment and cylinders conform to standards.

Pump down refrigerant system if possible. If not, make a manifold to remove refrigerant from various parts. Cylinder on scales before recovery. Start recovery machine per instructions. Do not overfill cylinders (max 80% liquid charge). Do not exceed max working pressure of cylinder. When cylinders filled, remove promptly; close isolation valves. Recovered refrigerant must be cleaned and checked before charging into another system.

17. Labeling

Equipment must be labeled stating it has been decommissioned and emptied of refrigerant, dated and signed. For flammable refrigerants, labels must state "FLAMMABLE REFRIGERANT".

18. Recovery

When removing refrigerant, all refrigerants should be removed safely. When transferring to cylinders, use appropriate recovery cylinders, correct number for total charge, designated for refrigerant, with pressure-relief valve and shut-off valves. Empty cylinders are evacuated and cooled. Recovery equipment must be in good working order, suitable for flammable refrigerant, with calibrated weighing scales. Hoses must be leak-free. Recovered refrigerant processed per local legislation. Do not mix refrigerants. If compressors/oils removed, ensure evacuated to acceptable level to remove flammable refrigerant. Do not heat compressor body. Drain oil safely.

19. Transportation, Marking and Storage for Units

1. Transport of equipment containing flammable refrigerants: Compliance with transport regulations.
2. Marking of equipment using signs: Compliance with local regulations.
3. Disposal of equipment using flammable refrigerants: Compliance with national regulations.
4. Storage of equipment/appliances: Per manufacturer's instructions.
5. Storage of packed (unsold) equipment: Package protection must prevent mechanical damage causing refrigerant leaks. Max number of pieces stored together determined by local regulations.

Explanation of Symbols on Indoor/Outdoor Unit (Table 4 Summary)

The manual explains symbols found on the unit:

• ⚠ WARNING (A2L): Indicates flammable refrigerant; risk of fire if leaks and exposed to ignition source.
• 📚 CAUTION: Read operation manual carefully.
• 🛠 CAUTION: Service personnel should handle equipment with reference to installation manual.
• ℹ️ CAUTION: Information available in operating or installation manual.

Accessories

The system is shipped with various accessories. Keep the owner's manual in a safe place and do not discard any accessories until installation is complete.

Accessories Included (Table 5 Summary)

Key accessories include:

• Owner's and Installation Manual (2)
• Remote Controller (1)
• Batteries (2)
• Liquid Line Flare to Weld Adapter (3/8" All Sizes) (1)
• Fastening Belt (2)
• Sponge (4)
• Flare Nut (18K-60K) (2)

Accessories included with the outdoor unit:

• Drain Joint (1)
• Seal (1)
• Suction Line Flare to Weld Adapter (3/4" 18K-48K; 7/8" 60K) (1)
• Liquid Line Flare to Weld Adapter (3/8" All Sizes) (1)
• Suction Line Reducer (1)

Indoor Unit Parts and Major Functions

The indoor unit features an air outlet at the top and an air inlet at the bottom, with a filter cover. Internally, it includes a blower, coil, filter, refrigerant connecting pipe, and drain hose. The coil compartment and upflow drain pan are also part of the unit.

Operating Conditions

Use the system within specified temperatures for safe and effective operation. Operating outside these conditions may lead to malfunction or reduced efficiency.

Inverter Split Type Temperature Ranges (Table 6 Summary)

This table details the recommended temperature ranges for different operating modes:

• Room Temperature:
  • COOL MODE: 60°F - 90°F (16°C - 32°C)
  • HEAT MODE: 32°F - 86°F (0°C - 30°C)
  • DRY MODE: 50°F - 90°F (10°C - 32°C)
• Outdoor Temperature:
  • With High-Tier Outdoors: -22°F - 122°F (-30°C - 50°C) for COOL, -22°F - 75°F (-30°C - 24°C) for HEAT.
  • With Mid-Tier Outdoors: -13°F - 122°F (-25°C - 50°C) for COOL, -13°F - 75°F (-25°C - 24°C) for HEAT.
  • DRY MODE: 32°F - 122°F (0°C - 50°C)

For Outdoor Units with Crankcase Heater

If outside temperature is below 32°F (0°C), keep the outdoor unit powered to prevent damage.

NOTE: Room relative humidity less than 80%. If the air conditioner operates above this, condensation may occur.

To Further Optimize Unit Performance:

• Keep doors and windows closed.
• Limit energy usage by using TIMER ON and TIMER OFF functions.
• Do not block air inlets or outlets.
• Regularly inspect and clean air filters.

Controls Options

Supplier's Declaration of Conformity (Per FCC Part 2 Section 2.1077)

This section provides a template for the unique identifier and responsible party contact information for FCC compliance. The FCC Compliance Statement reiterates that the device complies with Part 15 of the FCC Rules, subject to not causing harmful interference and accepting received interference.

The air handler fan coil unit can be controlled mainly through:

1. Wired Controller (KSACN1401AAA): A non-polarity controller for all functions, equipped with an infrared receiver for use with the wireless controller. The wired remote controller has buttons for Mode, Set, OK, Timer On, Timer Off, Turbo, LED, C/F, and temperature/fan speed adjustments.
2. Wireless Controller (Included): A hand-held wireless remote with the same functionality as the wired controller, usable independently or in conjunction with it.
3. Third Party Heat Pump Thermostat (Not Included): Allows control via the built-in 24V interface.

Wireless Remote Control

Familiarize yourself with the remote control before using the unit.

Remote Control Functions (RG10F8(2)/BGEFU1)

The remote control features buttons for ON/OFF, TEMP ▲ (increase temperature), SET, OK, Timer On, Timer Off, Turbo, LED, C/F, TEMP ▼ (decrease temperature), FAN SPEED, MODE, and LOCK.

• ON/OFF: Turns the unit on or off.
• TEMP ▲ / ▼: Increases/decreases temperature in 1°F (0.5°C) increments. Max. 86°F (30°C), Min. 60°F (16°C). Press TEMP ▼ & TEMP ▲ together for 3 seconds to alternate between °F and °C.
• SET: Scrolls through operation functions (Active clean ♻, Fresh ☘, Sleep ⏰, Follow Me ⬅, AP mode ⛶). Press OK to confirm selected symbol.
• FAN SPEED: Selects fan speeds (AU → 20% → 40% → 60% → 80% → 100%). Press TEMP ▲ or ▼ to increase/decrease fan speed in 1% increments.
• MODE: Scrolls through operation modes (AUTO → COOL → DRY → HEAT → FAN).
• OK: Confirms selected functions.
• TIMER: Sets timer to turn unit on or off.
• ECO/GEAR: Enters energy efficient mode.
• LOCK: Turns indoor unit's LED display and air conditioner buzzer on and off for a comfortable, quiet environment.
• TURBO: Enables unit to reach preset temperature in shortest possible time.

NOTE: Intelligence Sensor and Vertical Swing functions are not available on this unit. When matching with multi-zone condensers, Intelligence Sensor, Humidity Control, ECO, Active Clean, Gear, and Silent Mode will not be available. Hold Boost and Humidity button for five seconds to lock or unlock the wireless remote controller.

Wireless Remote Control LCD Screen Indicators (Fig. 6 Description)

The LCD screen displays various indicators when the remote controller is powered up:

• Transmission Indicator: Lights up when remote sends signal to indoor unit.
• ON/OFF: Indicates unit power status.
• TIMER ON/OFF: Displays timer settings.
• Silence feature: Indicates quiet operation.
• FAN SPEED: Displays selected fan speed (Silence → 1%, LOW → 2%-20%, MED → 21%-40%, HIGH → 41%-60%, AUTO → 61%-80%, 81%-100%). Fan speed cannot be adjusted in AUTO or DRY mode.
• MODE: Displays current mode (AUTO, COOL, DRY, HEAT, FAN).
• ECO: Displays when ECO feature is activated.
• GEAR: Displays when GEAR feature is activated.
• LOCK: Displays when LOCK feature is activated.
• Temperature/Timer/Fan speed: Displays set temperature by default, or fan speed/timer setting. Temperature range: 60-86°F/16-30°C (or 60-82°F/20-28°C model dependent). Timer setting range: 0-24 hours. Fan speed setting range: AU-100%. Blank in FAN mode.
• Horizontal louver swing: Indicates horizontal louver movement.
• Vertical louver auto swing: Indicates vertical louver auto swing.
• TURBO mode: Displays when TURBO mode is active.
• Other symbols: Active clean, Fresh, Sleep mode, Follow me, Wireless control, Low battery detection (flashing).

Remote Control Operation - Quick Start

Point the control toward the right side of the unit. The unit confirms receipt of a command by an audible beep.

1. Turn the unit on by pushing ON/OFF.
2. To switch between °C and °F (default is °F), press and hold the + and - temperature set point buttons together for approximately 3 seconds.
3. Select the desired mode by pushing MODE (AUTO → COOL → DRY → HEAT → FAN).
4. Select the temperature set point by pointing the control toward the unit and pressing the increase/decrease temperature set point buttons.
5. Press FAN to select the desired fan speed.

NOTE: If the unit is operating in DRY or AUTO mode, the fan speed will be automatically set and cannot be adjusted.

Battery Installation

Two AAA 1.5v alkaline batteries (included) are required. To install or replace:

1. Slide the back cover off.
2. Insert batteries, following polarity markings.
3. Replace the cover.

NOTES:

1. Do not mix old/new or different battery types.
2. Remove batteries if not used for several weeks to prevent leakage.
3. Average battery life is about 6 months.
4. Replace batteries if no audible beep from indoor unit or Transmission Indicator fails to light.
5. Removing batteries erases programmed settings; reprogram after new batteries inserted.

Basic Remote Control Operation

Ensure unit is plugged in and powered before operation.

COOL Mode

To select COOL mode:

1. Press MODE to select COOL.
2. Set desired temperature using TEMP ▲ or TEMP ▼.
3. Press FAN to select fan speed (AU-100%).
4. Press ON/OFF to start the unit.

Setting Temperature

Operating temperature range is 60-86°F (16-30°C) / 68-82°F (20-28°C) (model dependent). Adjust in 1°F (0.5°C) increments.

HEAT Mode

To select HEAT mode:

1. Press MODE to select HEAT.
2. Set desired temperature using TEMP ▲ or TEMP ▼.
3. Press FAN to select fan speed (AU-100%).

NOTE: Outdoor temperature drops may affect HEAT function. Use air conditioner with other heating appliances in such instances.

AUTO Mode

In AUTO mode, the unit automatically selects COOL, FAN, or HEAT based on set temperature.

To select AUTO mode:

1. Press MODE to select AUTO.
2. Set desired temperature using TEMP ▲ or TEMP ▼.
3. Press ON/OFF to start the unit.

NOTE: Fan speed cannot be set in AUTO mode.

DRY Mode

To select DRY mode:

1. Press MODE to select DRY.
2. Set desired temperature using TEMP ▲ or TEMP ▼.
3. Press ON/OFF to start the unit.

FAN Mode

To select FAN mode:

1. Press MODE to select FAN.
2. Press FAN to select fan speed (AU-0%).
3. Press ON/OFF to start the unit.

Setting the Room Temperature Set Point

Press TEMP ▲ or TEMP ▼ to raise or lower temperature. Unit confirms with beep; value appears on display. Temperature can be set between 62°F (17°C) and 86°F (30°C) in 1°F or 1°C increments.

NOTE: In COOLING mode, if selected temperature is higher than room temperature, unit will not start. Same for HEATING mode if selected temperature is lower than room temperature.

Selecting the Fan Speed

Press FAN to select fan speed (AUTO → LOW → MED → HIGH).

NOTE: When unit is on, fan runs continuously in COOLING or HEATING mode. In HEATING mode, fan may slow down or shut off to prevent cold blow.

Timer Function

TIMER ON (start unit) and TIMER OFF (stop unit) can be used separately or together.

Timer ON only

Allows unit to start automatically at set time. Can be set while unit is on or off.

• UNIT ON:
  1. Press TIMER ON to initiate auto-on sequence. Set time displayed. Each press increases time by 30 minutes (up to 10h), then 60 minutes (up to 24h).
  2. When TIMER ON is set, unit light illuminates. Unit runs at set time.
• UNIT OFF:
  1. Set timer as described in UNIT ON section. Unit starts at set time.
  2. Adjust TIMER ON settings to 0.0 to cancel.

Timer OFF only

Allows unit to stop automatically at set time. Can be set while unit is on or off.

• UNIT ON:
  1. Press TIMER OFF to initiate auto-off sequence. Set time appears on display. Each press increases time by 30 minutes (up to 10h), then 60 minutes (up to 24h).
  2. When TIMER OFF is set, timer light illuminates and unit turns off automatically.
• UNIT OFF:
  1. Set TIMER to off as described in UNIT ON section. Timer display illuminates and unit remains off.
  2. Adjust TIMER ON settings to 0.0 to cancel.

Timer ON and Timer OFF

Use both functions to program unit to turn on and shut off at specified times.

Other Features

Default Setting

When unit restarts after power failure, it defaults to factory settings (AUTO mode, AUTO fan, 76°F (24°C)). Use remote control to update status.

Auto-Restart

If power fails, system stops. When power returns, Operation light flashes. Press ON/OFF on remote to restart. If auto restart function is enabled, unit restarts using same settings.

Three-Minute Protection Feature

Prevents unit from activating for approximately 3 minutes when restarting immediately after operation.

Heat Exchanger Dust Removal Function

Helps keep outdoor coil cleaner, extending maintenance intervals. When unit turns off, a 10-second delay occurs, and outdoor fan runs in reverse for 70 seconds to blow off loose dust/debris.

Sleep Operation

Decreases energy use while sleeping. Only activated via remote control. Not available in FAN or DRY mode.

• COOL Mode: After 1 hour, set point raises by 2°F (1°C). After another hour, set point raises by another 2°F (1°C) and fan runs at low speed. Unit shuts off 5 hours after setting. Sleep mode cancels if MODE, TEMP, FAN, TIMER, or ON/OFF buttons are pressed.
• HEAT Mode: Same as COOLING mode, but set points are lowered by 2°F (1°C).

The sleep feature will stop after 8 hours and the system will keep running with final situation.

TURBO Mode

Use TURBO mode to cool or heat room rapidly. Press TURBO (audible "beep" if indoor unit supports). Fan runs at super high speed. TURBO mode terminates automatically 20 minutes after pressing TURBO, or immediately by pressing TURBO again. Unit reverts to original setting when terminated.

Built-in 24V Interface Standard

Allows control of air handler with a third-party thermostat.

Care and Maintenance

Cleaning the Indoor Unit

Cleaning Your Indoor Unit (Air Filter)

To clean the air filter:

1. Remove the filter cover.
2. Remove the air filter.
3. Clean the air filter by vacuuming the surface or washing in warm water with mild detergent.

When washing with water, the inlet side should face down and away from the water stream. When using a vacuum cleaner, the inlet side should face the vacuum.

Maintaining the Unit – Long Periods of Non-Use

If not using unit for extended period:

• Clean all filters.
• Turn on FAN function until unit dries out completely.
• Turn off the unit and disconnect the power.
• Remove batteries from remote control.

Maintenance – Pre-Season Inspection

After long periods of non-use, or before frequent use:

• Check for damaged wires.
• Clean all filters.
• Check for leaks.
• Make sure nothing is blocking all air inlets and outlets.
• Replace batteries.

Troubleshooting

Common Issues (Table 7 Summary)

This table provides a list of common issues and their possible causes:

• Unit does not turn on: Could be due to 3-minute protection feature, outdoor temperature too cold (anti-cold wind activated), or anti-freeze protection.
• Unit changes from COOL/HEAT to FAN mode: To prevent frost, or set temperature reached.
• Indoor/Outdoor unit emits white mist: Due to large temperature difference in humid regions, or moisture from defrosting.
• Unit makes noises: Rushing air (louver reset), squeaking (system OFF/COOL, drain pump), expansion/contraction of plastic parts in HEAT mode.
• Low hissing sound: Normal refrigerant gas flow or stopping/changing direction.
• Squeaking sound (outdoor unit): Normal expansion/contraction of plastic/metal parts due to temperature changes.
• Dust emitted: Accumulation during non-use.
• Bad odor: Unit absorbs odors from environment (furniture, cooking, cigarettes), or moldy filters.
• Outdoor fan not operating: Fan speed controlled to optimize product operation.
• Leak Detection: System detects refrigerant leakage, displays error code, emits buzzing sound, compressor stops, indoor fan runs. Refrigerant sensor has a 15-year service life. Sensor malfunction displays FHCC. Sensor cannot be repaired, only replaced by manufacturer-specified sensor.

NOTE: If problem persists, contact a local dealer or customer service center with a detailed description of the malfunction and model number.

Other Issues (Table 8 Summary)

This table lists other potential problems, their causes, and solutions:

• Poor Cooling Performance: High temperature setting, dirty heat exchanger/air filter, blocked air inlet/outlet, open doors/windows, excessive heat sources, low refrigerant. Solutions include lowering temperature, cleaning, removing obstructions, closing openings, reducing heat sources, checking for leaks, and topping off refrigerant.
• Unit is not working: Power failure, power off, blown fuse, dead remote batteries, 3-minute protection, timer activated. Solutions include restoring power, turning on, replacing fuse/batteries, waiting, or turning off timer.
• Unit starts and stops frequently: Too much/too little refrigerant, incompressible gas/moisture in system, blocked system circuit, broken compressor, voltage too high/low. Solutions include checking for leaks, recharging, evacuating/recharging, replacing malfunctioning equipment/compressor, installing manostat.
• Poor heating performance: Extremely low outdoor temperature, cold air entering through openings, low refrigerant. Solutions include using auxiliary heating, closing openings, checking for leaks, and topping off refrigerant.
• Indicator lamps flashing/Error code appears: Unit may stop or run safely. If flashing/codes persist after 10 minutes, disconnect power, reconnect, and turn on. If still persists, contact customer service.

NOTE: If the problem persists after performing checks and diagnostics above, turn off your unit immediately and contact an authorized service center.

The design and specifications are subject to change without prior notice for product improvement. Consult with the sales agency or manufacturer for details. Any updates to the manual will be uploaded to the service website, please check for the latest version.

Error Codes (Table 9 & 10 Summary)

The manual provides two tables detailing error codes:

• Table 9 - Error Codes: Lists various display codes (e.g., ECC1, ECO7, EH00, PC08, LC01) and their corresponding malfunction or protection indications. These cover issues like refrigerant leaks, fan motor speed control, EEPROM errors, sensor errors (temperature, humidity), communication errors, pressure issues, compressor problems, voltage protection, and more.
• Table 10 - Leak Detection Error Codes: Specifically lists EHC1 (Refrigerant Sensor detects a leak) and EHC2 (Working condition of the refrigerant sensor is out of range and a leak is detected). If these codes appear, a technician should be called immediately. The unit will enter turbo mode and emit a beeping noise until the error is cleared. For additional diagnostic information, refer to the Service Manual.