Daikin launches next-generation IV heat pump system


Energy-saving unit includes variable refrigerant temperature, continuous heating during defrost, and simplified servicing

Daikin is preparing to launch the latest generation IV heat pumps, which will help to set a new becnmark for efficiency.

Due to be launched in January, the new VRV IV Heat Pump units feature major enhancements including variable refrigerant temperature, continuous heating during defrost, and an VRV configurator for simplified commissioning and servicing. Variable refrigerant temperature technology allows installers to customise the system using a choice of presets.

The new VRV IV heat pump system from Daikin

The new VRV IV heat pump system from Daikin

In automatic mode, the system is configured for high efficiency levels throughout the year, while allowing rapid response on the hottest days. This technology is capable of delivering a 28% increase in seasonal efficiency because the system continually adjusts the refrigerant temperature according to the total required capacity and weather conditions.

For example, in mid season when little cooling is needed, the room temperature will already be close to the setpoint, so a small difference between room and refrigerant temperature is sufficient for the system to operate effectively. In automatic mode, the system will change the refrigerant temperature from 6°C - the current operating standard - to a higher temperature, resulting in reduced energy consumption and significantly improving the seasonal efficiency.

The other available mode is the ‘high sensible’ mode, where energy efficiency is maximised with guaranteed high outblow temperatures and no cold drafts, but in this case the setpoint may not be maintained so accurately.

Continuous heating during defrost makes it the best heat pump alternative to traditional heating and cooling systems and finally overcomes any perceived disadvantages of specifying a heat pump because it continues to provide continuous comfort, even when in defrost mode. This is important because all heat pumps accumulate ice during heating operation, which must be melted periodically.This defrost operation reverses the refrigeration cycle, causing a temporary temperature drop within the room. VRV IV features a unique heat-accumulating element that provides dedicated energy for the defrost function, while indoor units continue to provide heating and maintain a comfortable indoor climate.

To complement the VRV IV heat pump system, Daikin’s new intelligent Touch Manager (iTM) offers an intuitive user interface with a visible floorplan, which can manage up to 2,560 indoor units and provides energy management tools to maximise efficiency.

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In addition, the VRV IV heat pump can be used together with a wide range of ventilation units, hot water hydroboxes, Biddle air curtains and Daikin’s wide range of fan coil units, including the latest round flow cassettes, which feature a daily auto cleaning filter option that could reduce energy consumption over the year by up to 50%. The Roundflow cassette is also available with a presence sensor that adjusts the setpoint or switches off the unit when nobody is in the room. This produces potential further savings in energy consumption of up 27% over a typical three-hour working period.