ComfortStar Split Inverter Air Conditioners

Part 1: General Information

• 1 Product lineup
• 2 Specifications
• 3 Dimensional drawings
• 4 Layout Functional Components

1 Product lineup

2 Specifications

3 Dimensional drawings

4 Layout Functional Components

Part 2: Wiring Diagram

• 1 Electric wiring diagram
• 2 PCB
• 3 Low voltage wiring diagram
• 4 Electrical parameters

1 Electric wiring diagram

SW1 DIP switch selection (Indoor FAN speed)

SW2 DIP switch selection

Wire Color Code

2 PCB

3 Low voltage wiring diagram

The following wiring diagrams are suitable for the Indoor Unit and Outdoor Unit with 24V thermostat.

Wiring for 1H and 1C thermostat (no heat pump system model)

Wiring for 1H and 1C thermostat (no heat pump system model)

Wiring for 2H and 1C thermostat (no heat pump system model)

Wiring for 2H and 2C thermostat (no heat pump system model)

Wiring for 3H and 1C thermostat (no heat pump system model)

Wiring for 3H and 2C thermostat (no heat pump system model)

Wiring for 4H and 2C thermostat (no heat pump system model)

Control Logic:

Indoor unit connector

Notes:

1. DH wiring is optional and requires a thermostat with a humidistat. DH functions as Passive Dehumidification and will downstage the indoor fan to first stage. System will operate according to normal sequence of operations if DH wiring is absent.
2. Dashed lines in the above thermostat wiring diagrams refer to optional wiring (wiring for Passive Dehumidification Function and/OR Electric Heat). For thermostat wiring please refer to the Owner's Manual of the thermostat.
3. B wire must be used with heat pump system only, the reversing valve energizes in heating.

4 Electrical parameters

Part 3: Diagnosis and Troubleshooting

• 1 Error code table
• 2 Troubleshooting
  • 2.1 Safety Precautions
  • 2.2 T1/T2 temperature sensor fault troubleshooting
  • 2.3 Refrigerant concentration sensor fault troubleshooting
  • 2.4 Refrigerant leakage protection troubleshooting
  • 2.5 Anti-freeze protection troubleshooting
  • 2.6 Indoor unit EEPROM fault troubleshooting
  • 2.7 Indoor fan motor fault troubleshooting
  • 2.8 Communication error between outdoor and indoor unit troubleshooting
  • 2.9 Wired controller communication error troubleshooting
• 3. Temperature Sensor Resistance Characteristics

1 Error code table

[Image of PCB with LED indicators labeled LED1 - power indicator and LED2 - system status indicator]

Note: In normal operation, LED1 and LED2 are steady on; when the system is standby, LED1 will be steady on, LED2 will flash slowly.

2 Troubleshooting

2.1 Safety Precautions

The following precautions here are quite important, so be sure to follow them carefully. Read these instructions carefully before installation. Keep this manual in a handy for future reference.

Failure to adhere to all precautionary measures listed in this section may result in personal injury, damage to the unit or to property, or in extreme cases, death.

WARNING ⚠️ Indicates a potentially hazardous situation which if not avoided, could result in death or serious injury.

CAUTION ⚠️ Indicates a potentially hazardous situation which if not avoided, may result in minor or moderate injury. It is also used to alert against unsafe practices.

2.1.1 In case of Accidents or Emergency

WARNING ⚠️

• If a gas leak is suspected, immediately turn off the gas and ventilate the area if a gas leak is suspected before turning the unit on.
• If strange sounds or smoke is detected from the unit, turn the breaker off and disconnect the power supply cable.
• If the unit comes into contact with liquid, contact an authorized service center.
• If liquid from the batteries makes contact with skin or clothing, immediately rinse or wash the area well with clean water.
• Do not insert hands or other objects into the air inlet or outlet while the unit is plugged in.
• Do not operate the unit with wet hands.

CAUTION ⚠️

• Clean and ventilate the unit at regular intervals when operating it near a stove or near similar devices.
• Do not use the unit during severe weather conditions. If possible, remove the product from the window before such occurrences.

2.1.2 Information servicing (For flammable materials)

WARNING ⚠️

• Use this unit only on a dedicated circuit.
• Damage to the installation area could cause the unit to fall, potentially resulting in personal injury, property damage, or product failure.
• Only qualified personnel should disassemble, install, remove, or repair the unit.
• Only a qualified electrician should perform electrical work. For more information, contact your dealer, seller, or an authorized service center.

CAUTION ⚠️

• While unpacking be careful of sharp edges around the unit as well as the edges of the fins on the condenser and evaporator.

2.1.3 Operation and Maintenance

WARNING ⚠️

• Do not use defective or under-rated circuit breakers.
• Ensure the unit is properly grounded and that a dedicated circuit and breaker are installed.
• Do not modify or extend the power cable. Ensure the power cable is secure and not damaged during operation.
• Do not unplug the power supply plug during operation.
• Do not store or use flammable materials near the unit.
• Do not open the inlet grill of the unit during operation.
• Do not touch the electrostatic filter if the unit is equipped with one.
• Do not block the inlet or outlet of air flow to the unit.
• Do not use harsh detergents, solvents, or similar items to clean the unit. Use a soft cloth for cleaning.
• Do not touch the metal parts of the unit when removing the air filter as they are very sharp.
• Do not step on or place anything on the unit or outdoor units.
• Do not drink water drained from the unit.
• Avoid direct skin contact with water drained from the unit.

Use a firm stool or step ladder according to manufacturer procedures when cleaning or maintaining the unit.

CAUTION ⚠️

• Do not install or operate the unit for an extended period of time in areas of high humidity or in an environment directly exposing it to sea wind or salt spray.
• Do not install the unit on a defective or damaged installation stand, or in an unsecured location.
• Ensure the unit is installed at a level position.
• Do not install the unit where noise or air discharge created by the outdoor unit will negatively impact the environment or nearby residences.
• Do not expose skin directly to the air discharged by the unit for prolonged periods of time.
• Ensure the unit operates in areas water or other liquids.
• Ensure the drain hose is installed correctly to ensure proper water drainage.
• When lifting or transporting the unit, it is recommended that two or more people are used for this task.
• When the unit is not to be used for an extended time, disconnect the power supply or turn off the breaker.

2.2 T1/T2 temperature sensor fault troubleshooting

LED2 flashes for 2 times every 8 seconds indicates indoor unit T1 temperature sensor fault.

LED2 flashes for 3 times every 8 seconds indicates indoor unit T2 temperature sensor fault.

The unit stops running and LED2 flashes 2 or 3 times in each round.

Troubleshooting Flowchart:

• T1/T2 temperature sensor fault
  • No -> Temperature sensor is not installed -> Yes -> Installed the temperature sensor
  • No -> Temperature sensor connection on PCB is loose -> Yes -> Ensure the sensor is connected properly
  • No -> Temperature sensor is affected by moisture or water -> Yes -> Dry the sensor
  • No -> Temperature sensor has short circuit or is failed -> Yes -> Replace the sensor
  • No -> Replace the control PCB

Note: Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor's resistance characteristics table, the sensor has failed.

2.3 Refrigerant concentration sensor fault troubleshooting

LED2 flash for 4 times every 8 seconds indicates refrigerant concentration sensor fault (Only valid when connected to a refrigerant concentration sensor).

The unit stops running and LED2 flashes 4 times in each round.

Troubleshooting Flowchart:

• Refrigerant concentration sensor fault
  • No -> Refrigerant concentration sensor is affected by moisture or water -> Yes -> Dry the sensor
  • No -> Refrigerant concentration sensor has short circuit or is failed -> Yes -> Replace the sensor
  • No -> Replace the control PCB

2.4 Refrigerant leakage protection troubleshooting

LED2 flashes for 5 times every 8 seconds indicates refrigerant leakage protection (Only valid when connected to a refrigerant concentration sensor).

The unit stops running and error code is displayed on LED2 flashes 5 times in each round.

Troubleshooting Flowchart:

• E6
  • Piping connection between outdoor and indoor unit is not secure -> Yes -> Immediately open the door and windows for ventilation and check whether the copper pipe thread connections are tight. After ensuring that the copper pipe connections are normal, turn on the air conditioner and add refrigerant by referring to the refrigerant temperature and operating current.
  • No -> Refrigerant concentration sensor has short circuit or is failed -> Yes -> Replace the sensor
  • No -> Replace the control PCB

Note:

1. Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor's resistance characteristics table, the sensor has failed.
2. E2/E3 is applicable only when communication is established between the ComfortStar outdoor unit and the ComfortStar indoor unit via RS-485.

2.5 Anti-freeze protection troubleshooting

LED2 flashes 6 times every 8 seconds indicates anti-freeze protection.

The unit stops running and LED2 flashes 6 times in each round.

Troubleshooting Flowchart:

• Anti-freeze protection
  • Poor heat exchange caused by poor ventilation of the indoor unit or blockage of evaporator or air filter -> Yes -> Ensure that the indoor unit has good ventilation and remove dust and other debris from the evaporator and air filter.
  • No -> Indoor unit fan failure -> Yes -> Check if the indoor unit fan is jammed and ensure that the fan is operating normally.
  • No -> Replace the indoor control PCB

2.6 Indoor unit EEPROM fault troubleshooting

LED2 flashes for 7 times every 8 seconds indicates Indoor unit EEPROM fault.

The unit stops running and LED2 flashes 7 times in each round.

Troubleshooting Flowchart:

• Indoor unit EEPROM fault
  • Indoor PCB DIP switch setting is wrong -> Yes -> Adjust the DIP switch
  • No -> EEPROM is not properly connected to the indoor PCB -> Yes -> Ensure the EEPROM is connected properly
  • No -> Replace the control PCB

2.7 Indoor fan motor fault troubleshooting

LED2 flashes 8 times every 8 seconds indicates indoor fan motor fault.

The unit stops running and LED2 flashes 8 times in each round.

Troubleshooting Flowchart:

• Indoor fan motor fault
  • Wires of fan are not connected properly -> Yes -> Ensure wires are connected properly
  • No -> The fan motor is blocked or failed -> Yes -> Remove obstruction or replace the fan motor
  • No -> The power supply is abnormal -> Yes -> Check the power supply equipment
  • No -> Replace the indoor control PCB

2.8 Communication error between outdoor and indoor unit troubleshooting

LED2 flashes 9 times every 8 seconds indicates communication error between outdoor and indoor unit.

The unit stops running and LED2 flashes 9 times in each round.

Troubleshooting Flowchart:

• Communication error between outdoor and indoor unit
  • Communication terminals on outdoor or indoor unit have short circuit or are disconnected or misconnected -> Yes -> Reconnect the communication terminals and ensure the connection is properly.
  • No -> Interference from high voltage (220V or higher) wires -> Yes -> Ensure the communication wires and high voltage wires are separated.
  • No -> Communication wires are close to a source of electromagnetic radiation such as transformer or strong fluorescent lamp -> Yes -> Remove the source of interference, or add additional shielding to the communication wires.
  • No -> The communication board is damaged -> Yes -> Replace the communication board (in outdoor unit electrical control box)
  • No -> Replace the indoor control PCB

2.9 Wired controller communication error troubleshooting

LED2 flashes 10 times every 8 seconds indicates wired controller communication error.

The unit stops running and LED2 flashes 10 times in each round.

Troubleshooting Flowchart:

• Wired controller communication error
  • Communication terminals on wired controller or indoor unit have short circuit or are disconnected or -> Yes -> Reconnect the communication terminals and ensure the connection is properly.
  • No -> Interference from high voltage (220V or higher) wires -> Yes -> Ensure the communication wires and high voltage wires are separated.
  • No -> Communication wires are close to a source of electromagnetic radiation such as transformer or strong fluorescent lamp -> Yes -> Remove the source of interference, or add additional shielding to the communication wires.
  • No -> Replace the indoor control PCB

3. Temperature Sensor Resistance Characteristics

Room temperature sensor(T1) and condenser coil temperature sensor(T2) resistance characteristics.