ComfortStar Air Conditioner Owner's Manual
Brand: ComfortStar
Models: AHU-SG2 Series Indoor Units, CPR Series Outdoor Units
Document Type: Owner's Manual
Important Note
Read this manual carefully before installing or operating your new air conditioning unit. Save this manual for future reference. Please check the applicable models, technical data, F-GAS (if any), and manufacturer information from the "Owner's Manual - Product Fiche" in the packaging of the outdoor unit.
WARNING: This appliance can be used by children aged 8 years and above and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved. Children shall not play with the appliance. Cleaning and user maintenance shall not be made by children without supervision. This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety. Children should be supervised to ensure that they do not play with the appliance.
Safety Precautions
To prevent injury to the user or other people and property damage, follow the instructions provided. Incorrect operation due to ignoring instructions may cause harm or damage.
Risk Indicators:
- ! WARNING: Indicates the possibility of personnel injury or loss of life.
- ! CAUTION: Indicates the possibility of property damage or serious consequences.
- NOTICE: Addresses practices not related to physical injury.
Warnings for Product Use
- If an abnormal situation arises (e.g., burning smell), immediately turn off the unit and disconnect the power. Call your dealer for instructions to avoid electric shock, fire, or injury.
- Do not insert fingers, rods, or other objects into the air inlet or outlet, as the fan may be rotating at high speeds, causing injury.
- Do not use flammable sprays (e.g., hair spray, lacquer, paint) near the unit, as this may cause fire or combustion.
- Do not operate the air conditioner in places near or around combustible gases, as emitted gas may collect and cause an explosion.
- Do not operate in wet rooms (e.g., bathroom, laundry room), as excessive water can cause electrical components to short circuit.
- Do not expose your body directly to cool air for prolonged periods.
- Do not allow children to play with the air conditioner; they must be supervised around the unit at all times.
- If the air conditioner is used with burners or other heating devices, thoroughly ventilate the room to avoid oxygen deficiency and carbon monoxide buildup.
- For certain environments like kitchens or server rooms, specially designed air-conditioning units are recommended.
- Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury, or loss of life. Installation and service must be performed by a licensed professional HVAC installer or equivalent service agency.
Warnings for Cleaning and Maintenance
- Turn off the device and disconnect the power before cleaning. Failure to do so can cause electrical shock.
- Do not clean the air conditioner with excessive amounts of water.
- Do not clean the air conditioner with combustible cleaning agents, as they can cause fire or deformation.
Cautions
- Turn off the air conditioner and disconnect the power if you will not use it for a long time.
- Turn off and unplug the unit during storms.
- Make sure that water condensation can drain unhindered from the unit.
- Do not operate the air conditioner with wet hands; this may cause electric shock.
- Do not use the device for any purpose other than its intended use.
- Do not climb onto or place objects on top of the outdoor unit.
- Do not allow the air conditioner to operate for long periods with doors or windows open, or if humidity is very high.
- Be aware of sharp sheet metal edges, which can cause personal injury. Wear gloves and protective clothing when handling.
Electrical Warnings
- Only use the specified power cord. If damaged, it must be replaced by the manufacturer, service agent, or qualified persons to avoid hazards.
- Keep the power plug clean. Remove dust or grime to prevent fire or electric shock.
- Do not pull the power cord to unplug the unit; hold the plug firmly. Pulling the cord can damage it, leading to fire or electric shock.
- Do not modify the power supply cord length or use an extension cord.
- Do not share the electrical outlet with other appliances; insufficient power supply can cause fire or electric shock.
- The product must be properly grounded during installation to prevent electrical shock.
- For all electrical work, follow local and national wiring standards, regulations, and the Installation Manual. Connect cables tightly and clamp securely. Improper connections can overheat, cause fire, or shock. All connections must follow the Electrical Connection Diagram on unit panels.
- Arrange wiring properly to ensure the control board cover closes securely. An improperly closed cover can lead to corrosion, terminal heating, fire, or electric shock.
- If connecting power to fixed wiring, an all-pole disconnection device with at least 3mm clearances, a residual current device (RCD) with a rated residual operating current not exceeding 30mA, and disconnection must be incorporated according to wiring rules.
Fuse Specifications
The air conditioner's circuit board (PCB) has a fuse for overcurrent protection. This fuse MUST be replaced with an identical component. Specifications are printed on the circuit board (e.g., T5A/250VAC, T10A/250VAC).
Warnings for Product Installation
- Installation must be performed by an authorized dealer or specialist. Defective installation can cause water leakage, electrical shock, or fire.
- Installation must be performed according to the installation instructions. Improper installation can cause water leakage, electrical shock, or fire. (In North America, installation must be performed in accordance with NEC and CEC by authorized personnel only.)
- Contact an authorized service technician for repair or maintenance. This appliance shall be installed in accordance with national wiring regulations.
- Only use included accessories, parts, and specified parts for installation. Non-standard parts can cause water leakage, electrical shock, fire, and unit failure.
- Install the unit in a location that can support its weight. If the location cannot support the weight or installation is improper, the unit may drop, causing serious injury and damage.
- Install drainage piping according to manual instructions. Improper drainage may cause water damage.
- For units with an auxiliary electric heater, do not install within 1 meter (3 feet) of any combustible materials.
- Do not install in a location exposed to combustible gas leaks, as accumulated gas may cause fire.
- Do not turn on the power until all work is completed.
- When moving or relocating, consult experienced service technicians for disconnection and reinstallation.
- Refer to "indoor unit installation" and "outdoor unit installation" sections for details on appliance support.
- Excessive Weight Hazard: Use two or more people when moving and installing the unit. Failure to do so can result in back or other type of injury.
Note About Fluorinated Gases
This air-conditioning unit contains fluorinated greenhouse gases. For specific information on the type and amount of gas, refer to the label on the unit or the "Owner's Manual - Product Fiche" (for European Union products). Installation, service, maintenance, and repair must be performed by a certified technician. Product uninstallation and recycling must also be performed by a certified technician. Equipment containing fluorinated greenhouse gases (5 to 50 tonnes CO2 equivalent) with a leak-detection system requires checks every 24 months. Proper record-keeping of all checks is recommended.
NOTICE: The allowed static pressure range of the air conditioner on site is 0-0.80 in-H2O (0-200 Pa).
| MODEL | PRESSURE |
|---|---|
| 18-24K | 0.10 in-H2O (25Pa) |
| 30-36K | 0.15 in-H2O (37Pa) |
| 48-60K | 0.20 in-H2O (50Pa) |
Indoor Unit Parts and Major Functions
Unit Parts
The indoor unit features an air outlet at the top and an air inlet at the bottom. It also has a FILTER COVER.
[Illustration of the indoor unit showing air outlet, filter cover, and air inlet.]
Operating Conditions
Use the system under the following temperatures for safe and effective operation. Using the air conditioner under different conditions may cause malfunction or reduced efficiency.
Inverter Split Type
| Mode | |||
|---|---|---|---|
| COOL mode | HEAT mode | DRY mode | |
| Room Temperature | 16°C - 32°C (60°F - 90°F) | 0°C - 30°C (32°F - 86°F) | 10°C - 32°C (50°F - 90°F) |
| Outdoor Temperature | 0°C - 50°C (32°F - 122°F) | -15°C - 50°C (5°F - 122°F) | 0°C - 50°C (32°F - 122°F) |
| (For models with low temp. cooling systems.) | -15°C - 24°C (5°F - 75°F) | 0°C - 52°C (32°F - 126°F) (For special tropical models) | |
| 0°C - 52°C (32°F - 126°F) (For special tropical models) | |||
For Outdoor Units with Auxiliary Electric Heater
When the outside temperature is below 0°C (32°F), it is strongly recommended to keep the outdoor unit powered at all times to prevent damage.
Fixed-speed Type
| Mode | |||
|---|---|---|---|
| COOL mode | HEAT mode | DRY mode | |
| Room Temperature | 16°C-32°C (60°F-90°F) | 0°C-30°C (32°F-86°F) | 10°C-32°C (50°F-90°F) |
| Outdoor Temperature | 18°C-43°C (64°F-109°F) | -7°C-43°C (19°F-109°F) | 18°C-43°C (64°F-109°F) |
| (For models with low-temp cooling systems) | 18°C-52°C (64°F-126°F) (For special tropical models) | -7°C-24°C (19°F-75°F) | 18°C-52°C (64°F-126°F) (For special tropical models) |
NOTICE: Room relative humidity less than 80%. If the air conditioner operates in excess of this figure, condensation may form on the surface.
Features
Refrigerant Leak Detection System (some models)
In the event of a refrigerant leak, the LCD screen will display "ELOC" and the LED indicator light will flash. The default temperature on first power-on is 16°C for refrigeration and 30°C for heating. When the temperature stabilizes, it is set to the room temperature at that time.
NOTICE:
- Under normal working conditions, the switch, wind speed, and temperature cannot be adjusted by remote control.
- Wire controller requirements: Control AXU function for live heating.
Energy Saving Tips
- DO NOT set the unit to excessive temperature levels.
- While cooling, close the curtains to avoid direct sunlight.
- Doors and windows should be kept closed to retain cool or warm air in the room.
- DO NOT place objects near the air inlet and outlet of the unit.
- Replace the air filter every 30 to 90 days, depending on thickness and MERV rating.
[Illustration: Curtains drawn across a window, with text "Closing curtains during heating also helps keep the heat in".]
[Illustration: A closed door and a closed window, with text "Doors and windows should be kept closed".]
Care and Maintenance
Cleaning Your Indoor Unit
Before Cleaning or Maintenance
- Always turn off your air conditioner system and disconnect its power supply before cleaning or maintenance.
- Contact an authorized service technician for repair or maintenance. Improper repair and maintenance may cause water leakage, electrical shock, or fire, and may void your warranty.
- DO NOT substitute a blown fuse with a higher or lower amperage rating fuse, as this may cause circuit damage or an electrical fire. Replacement fuse must be identical to the one removed.
- Make sure the drain hose is set up according to the instructions. Failure to do so could cause leakage and result in personal property damage, fire, and electric shock.
- Make sure that all wires are connected properly. Failure to connect wires according to instructions can result in electrical shock or fire.
Cleaning Cautions
- Only use a soft, dry cloth to wipe the unit clean. If the unit is especially dirty, use a cloth soaked in warm water to wipe it clean.
- Do not use chemicals or chemically treated cloths to clean the unit.
- Do not use benzene, paint thinner, polishing powder, or other solvents to clean the unit, as they can cause the plastic surface to crack or deform. Use of volatile cleaners may cause fire, resulting in injury or death.
- Do not use water hotter than 40°C (104°F) to clean the front panel, as this can cause the panel to deform or become discolored.
- DO NOT wash the unit under running water, as doing so creates an electrical hazard.
- Clean the unit using a damp, lint-free cloth and neutral detergent. Dry the unit with a dry, lint-free cloth.
NOTICE: Replace the air filter every 30 to 90 days depending on MERV rating.
[Illustration: An air filter and its cover plate.]
Cautions for Filter Handling
- Before changing the filter or cleaning, turn off the unit and disconnect its power supply.
- When removing the filter, do not touch metal parts in the unit; sharp metal edges can cause cuts.
- Do not use water to clean the inside of the indoor unit, as this can destroy insulation and cause electrical shock.
- Do not expose the filter to direct sunlight when drying, as this can shrink the filter.
- Any maintenance and cleaning of the outdoor unit should be performed by an authorized dealer or a licensed service provider.
- Any unit repairs should be performed by an authorized dealer or a licensed service provider.
Maintenance – Long Periods of Non-Use
If you plan not to use your air conditioner for an extended period, do the following:
- Clean all filters. [Illustration: A filter with cleaning lines.]
- Turn on the FAN function until the unit dries out completely. [Illustration: A fan symbol.]
Maintenance – Pre-Season Inspection
After long periods of non-use, or before periods of frequent use, perform the following:
- Check for damaged wires. [Illustration: A wire with a damage indicator.]
- Clean all filters. [Illustration: A filter with cleaning lines.]
- Check for leaks. [Illustration: A magnifying glass over a pipe connection.]
- Make sure nothing is blocking all air inlets and outlets. [Illustration: An arrow showing clear airflow.]
Troubleshooting
Safety Precautions
If any of the following conditions occur, turn off your unit immediately!
- You smell a burning odor.
- The unit emits loud or abnormal sounds.
- A power fuse blows or the circuit breaker frequently trips.
- Water or other objects fall into or out of the unit.
DO NOT ATTEMPT TO FIX THESE YOURSELF! CONTACT AN AUTHORIZED SERVICE PROVIDER IMMEDIATELY!
Common Issues
| Issue | Possible Causes | Solutions |
|---|---|---|
| Unit does not turn on when pressing ON/OFF button | The unit has a 3-minute protection feature to prevent overloading. The unit cannot be restarted within three minutes of being turned off. | Wait three minutes after restarting the unit. |
| The unit changes from COOL/HEAT mode to FAN mode | In Cooling and Heating Models: Operation and PRE-DEF (Pre-heating/Defrost) indicators are lit, meaning the outdoor temperature is too cold and the unit's anti-cold wind is activated for defrosting. In Cooling-only Models: "Fan Only" indicator is lit, meaning the outdoor temperature is too cold and the unit's anti-freeze protection is activated for defrosting. | The unit may change its setting to prevent frost formation. Once the temperature increases, the unit will resume the previously selected mode. |
| The indoor unit emits white mist | The set temperature has been reached, causing the compressor to turn off. The unit will continue operating when the temperature fluctuates. | The set temperature has been reached, at which point the unit turns off the compressor. The unit will continue operating when the temperature fluctuates again. |
| Both the indoor and outdoor units emit white mist | In humid regions, a large temperature difference between room air and conditioned air can cause white mist. When the unit restarts in HEAT mode after defrosting, white mist may be emitted due to moisture generated from the defrosting process. | In humid regions, a large temperature difference between the room's air and the conditioned air can cause white mist. When the unit restarts in HEAT mode after defrosting, white mist may be emitted due to moisture generated from the defrosting process. |
| The indoor unit makes noises | A squeaking sound is heard when the system is OFF or in COOL mode. The noise is also heard when the drain pump (optional) is in operation. A squeaking sound may occur after running the unit in HEAT mode due to expansion and contraction of the unit's plastic parts. | A squeaking sound is heard when the system is OFF or in COOL mode. The noise is also heard when the drain pump (optional) is in operation. A squeaking sound may occur after running the unit in HEAT mode due to expansion and contraction of the unit's plastic parts. |
| Both the indoor unit and outdoor unit make noises | Low hissing sound during operation: This is normal and is caused by refrigerant gas flowing through both indoor and outdoor units. Low hissing sound when the system starts, has just stopped running, or is defrosting: This noise is normal and is caused by the refrigerant gas stopping or changing direction. Squeaking sound: Normal expansion and contraction of plastic and metal parts caused by temperature changes during operation can cause squeaking noises. | Low hissing sound during operation: This is normal and is caused by refrigerant gas flowing through both indoor and outdoor units. Low hissing sound when the system starts, has just stopped running, or is defrosting: This noise is normal and is caused by the refrigerant gas stopping or changing direction. Squeaking sound: Normal expansion and contraction of plastic and metal parts caused by temperature changes during operation can cause squeaking noises. |
| The outdoor unit makes noises | The unit will make different sounds based on its current operating mode. | The unit will make different sounds based on its current operating mode. |
| Dust is emitted from either the indoor or outdoor unit | The unit may accumulate dust during extended periods of non-use, which will be emitted when the unit is turned on. This can be mitigated by covering the unit during long periods of inactivity. | The unit may accumulate dust during extended periods of non-use, which will be emitted when the unit is turned on. This can be mitigated by covering the unit during long periods of inactivity. |
| The unit emits a bad odor | The unit may absorb odors from the environment (such as furniture, cooking, cigarettes, etc.) which will be emitted during operations. The unit's filters have become moldy and should be cleaned. | The unit may absorb odors from the environment (such as furniture, cooking, cigarettes, etc.) which will be emitted during operations. The unit's filters have become moldy and should be cleaned. |
| The fan of the outdoor unit does not operate | During operation, the fan speed is controlled to optimize product operation. | During operation, the fan speed is controlled to optimize product operation. |
Troubleshooting Poor Cooling Performance
| Problem | Possible Causes | Solution |
|---|---|---|
| Poor Cooling Performance | Temperature setting may be higher than ambient room temperature | Lower the temperature setting |
| The heat exchanger on the indoor or outdoor unit is dirty | Clean the affected heat exchanger | |
| The air filter is dirty | Remove the filter and clean it according to instructions | |
| The air inlet or outlet of either unit is blocked | Turn the unit off, remove the obstruction and turn it back on | |
| Doors and windows are open | Make sure that all doors and windows are closed while operating the unit | |
| Excessive heat is generated by sunlight | Close windows and curtains during periods of high heat or bright sunshine | |
| Too many sources of heat in the room (people, computers, electronics, etc.) | Reduce amount of heat sources | |
| Low refrigerant due to leak or long-term use | Check for leaks, re-seal if necessary and top off refrigerant |
Troubleshooting Unit Not Working / Frequent Start/Stop / Poor Heating
| Problem | Possible Causes | Solution |
|---|---|---|
| The unit is not working | Power failure | Wait for the power to be restored |
| The power is turned off | Turn on the power | |
| The fuse is burned out | Replace the fuse | |
| The Unit's 3-minute protection has been activated | Wait three minutes after restarting the unit | |
| Timer is activated | Turn timer off | |
| The unit starts and stops frequently | There's too much or too little refrigerant in the system | Check for leaks and recharge the system with refrigerant |
| Incompressible gas or moisture has entered the system. | Evacuate and recharge the system with refrigerant | |
| System circuit is blocked | Determine which circuit is blocked and replace the malfunctioning piece of equipment | |
| The compressor is broken | Replace the compressor | |
| Poor heating performance | The voltage is too high or too low | Install a thermostat to regulate the voltage |
| The outdoor temperature is extremely low | Use auxiliary heating device | |
| Cold air is entering through doors and windows | Make sure that all doors and windows are closed during use | |
| Low refrigerant due to leak or long-term use | Check for leaks, re-seal if necessary and top off refrigerant |
