What is Daikin Heat Mode / Reverse Cycle Mode

Daikin Heat Mode, also known as Reverse Cycle Mode, is a feature in Daikin air conditioners that allows the unit to switch between cooling and heating modes. This mode uses a reversing valve to reverse the flow of refrigerant, enabling the system to absorb heat from the outside air and release it inside during cold weather.

Understanding the Daikin Heat Mode Operation

In Heat Mode, the air conditioner operates by drawing in cold air from the room, passing it over an evaporator coil where the refrigerant absorbs the heat, and then compressing the refrigerant to increase its temperature. The heated refrigerant is then passed over a condenser coil, releasing the heat into the room. This process continues until the desired temperature is reached.

The key components involved in the Daikin Heat Mode operation are:

  1. Compressor: The compressor is the heart of the air conditioning system, responsible for circulating the refrigerant and increasing its pressure and temperature.
  2. Reversing Valve: The reversing valve is a critical component that allows the system to switch between cooling and heating modes. It controls the direction of the refrigerant flow, enabling the system to absorb heat from the outside air and release it inside.
  3. Evaporator Coil: The evaporator coil is where the refrigerant absorbs heat from the indoor air, causing the air to cool down.
  4. Condenser Coil: The condenser coil is where the heated refrigerant releases its heat to the outdoor air, causing the refrigerant to condense back into a liquid.
  5. Expansion Valve: The expansion valve is responsible for reducing the pressure and temperature of the refrigerant as it enters the evaporator coil.

The Daikin Heat Mode operation can be summarized as follows:

  1. The compressor compresses the refrigerant, increasing its temperature and pressure.
  2. The reversing valve directs the hot, high-pressure refrigerant to the indoor coil (condenser coil), where it releases its heat to the indoor air.
  3. The refrigerant then passes through the expansion valve, reducing its pressure and temperature.
  4. The low-pressure, low-temperature refrigerant enters the outdoor coil (evaporator coil), where it absorbs heat from the outdoor air, causing the air to cool down.
  5. The refrigerant then returns to the compressor, and the cycle repeats.

Benefits of Daikin Heat Mode

What is Daikin Heat Mode / Reverse Cycle ModeImage source: Daikin Air Conditioner Outdoor by Dinkun Chen

One of the primary benefits of using Daikin Heat Mode is its energy efficiency. According to Canstar, a reverse cycle air conditioner can be cheaper to run than a microwave, with an average cost of $0.13 to $0.36 per hour, making it a more cost-effective option than gas or electric heaters.

Additionally, Daikin Heat Mode offers the following advantages:

  1. Versatility: The ability to switch between cooling and heating modes allows the air conditioner to provide year-round comfort, adapting to the changing weather conditions.
  2. Consistent Heating: Daikin Heat Mode can maintain a consistent indoor temperature, even in extreme cold weather conditions, by continuously absorbing heat from the outdoor air and releasing it indoors.
  3. Improved Air Quality: Daikin Heat Mode can help improve indoor air quality by circulating and filtering the air, removing dust, pollen, and other airborne contaminants.
  4. Quiet Operation: Daikin air conditioners are known for their quiet operation, which can be particularly beneficial during the heating season when the system is running more frequently.

Activating and Setting Daikin Heat Mode

To activate Heat Mode, users can press the sun icon button or the “HEAT” button on their remote or wall controller. The AC system will likely stop for a few minutes to reverse the refrigeration cycle before starting to produce heat.

It is recommended to set the temperature for Heat Mode between 17°C to 21°C, depending on the state and climate. For example, in North QLD, North WA, NT, and central Australia, the optimal temperature is 17°C, while in TAS, the recommended temperature is 21°C.

When setting the temperature, it’s important to consider the following factors:

  1. Outdoor Temperature: The outdoor temperature will affect the efficiency and performance of the Daikin Heat Mode. In colder climates, a higher temperature setting may be required to maintain the desired indoor comfort level.
  2. Insulation and Airflow: The quality of insulation and the airflow within the home can also impact the optimal temperature setting. Well-insulated homes with good airflow may require a lower temperature setting compared to poorly insulated homes with restricted airflow.
  3. Personal Preference: Individual comfort preferences can also play a role in the optimal temperature setting. Some people may prefer a slightly warmer or cooler indoor environment, and the temperature setting should be adjusted accordingly.

It’s important to note that the Daikin Heat Mode may not be able to maintain the desired temperature in extremely cold weather conditions, as the system’s ability to absorb heat from the outdoor air may be limited. In such cases, supplementary heating sources may be required to maintain the desired indoor comfort level.

Maintenance and Troubleshooting

To ensure the optimal performance and longevity of the Daikin Heat Mode, regular maintenance is essential. This includes:

  1. Cleaning the Air Filters: Regularly cleaning or replacing the air filters can improve airflow and efficiency, ensuring the system operates at its best.
  2. Checking the Refrigerant Levels: Proper refrigerant levels are crucial for the system’s efficiency and performance. If the levels are low, a professional technician should be consulted to recharge the system.
  3. Inspecting the Coils: The evaporator and condenser coils should be inspected periodically for any signs of dirt, debris, or damage, and cleaned as necessary.
  4. Scheduling Routine Maintenance: It’s recommended to have a professional HVAC technician perform a comprehensive inspection and maintenance of the system at least once a year, preferably before the start of the heating season.

If you encounter any issues with the Daikin Heat Mode, such as the system not producing heat, inconsistent heating, or unusual noises, it’s important to troubleshoot the problem promptly. Some common troubleshooting steps include:

  1. Checking the Thermostat Settings: Ensure the thermostat is set to the correct mode (Heat) and the desired temperature is set appropriately.
  2. Inspecting the Circuit Breakers: Check the circuit breakers or fuses to ensure the system is receiving power.
  3. Clearing Any Obstructions: Ensure there are no obstructions around the indoor and outdoor units that could be impeding airflow.
  4. Contacting a Professional: If the issue persists or you’re unsure of the cause, it’s best to contact a qualified HVAC technician who can diagnose and repair the problem.

By understanding the Daikin Heat Mode operation, its benefits, and proper maintenance and troubleshooting techniques, you can ensure your Daikin air conditioning system provides reliable and energy-efficient heating throughout the colder months.