The FRENIC HVAC series is the dedicated inverter for HVAC that features functions and performances offer the optimal thermal environment for the people working in the building by keeping the energy consumption in various devices (compressor, condenser water pump, AHU and others) to the minimum.

Fuji Electric contributes largely to global environment by realizing carbon dioxide reduction with energy saving by the inverter.

Large Contribution to Reducing Global Warming (Environmental Protection) with Energy Saving

50% of energy consumption in office buildings is related to air conditioning. The FRENIC HVAC series is the dedicated inverter for HVAC that features functions and performances offer the optimal thermal environment for the people working in the building by keeping the energy consumption in various devices (compressor, condenser water pump, AHU and others) to the minimum.

Fuji Electric contributes largely to global environment by realizing carbon dioxide reduction with energy saving by the inverter.

Wide variation in model capacity

Model can be selected from two model types.

• Standard type (EMC filter built-in type)

0.75 to 710kW (Protective structure IP21 or IP55 can be selected with the model between 0.75 and 90kW.)

• DCR built-in + EMC filter built-in type

0.75 to 90kW (Protective structure IP21 or IP55 can be selected with the model between 0.75 and 90kW.)

Optimal control with energy-saving function

Linearization function

• Temperature difference constant control and pressure difference constant control
• Energy saving functions including wet-bulb temperature presumption control
• Automatic energy-saving operation

Slim body

The first slim body design among the Fuji Electric inverters.
The size is the same between IP21 and IP55 (the first in the industry).

Functions suitable for HVAC use

• 4PID control
• Fire mode (forced operation)
• Pick-up operation function
• Real time clock
• Torque vector control
• Filter clogging prevention function
• Customized logic
• User friendly, useful keypad
• Password function

Wet-bulb temperature presumption control

This function is optimal for controlling the fan of cooling tower. Since the wet-bulb temperature would become higher than the set temperature when the air temperature is particularly high, water temperature will not reach the set temperature.

Therefore, the fan keeps rotating at high speed, failing in energy-saving operation. FRENIC-HVAC automatically estimates the wet-bulb temperature and controls the fan so that the cooling water is interlocked with the air temperature in order not to use unnecessary electric power.

Filter clogging prevention function

This function detects clogging of the fan filter with dust or other materials using the output current and pressure sensor value. When clogging is detected, the fan is rotated in reverse to eject dust, and then resumes rotation in forward to blow air.

In addition, the function notifies you of maintenance necessity with the alarm signal.

Real time clock (RTC) is provided as standard.

• Alarm information with date and time

Alarm information for last ten times is stored and displayed with date and time.

• Timer function

Possible to set the maximum four timers for a week.

Possible to set flag holidays (20 days a year).

• Unit conversion function between PV and SV values

Unit conversion allows you to easily set data.

User friendly, easy to see keypad

• The regulator is indicated by enlarging the LCD.

• Multi-language supported: 19 languages + user customized language

* Languages in parentheses are soon to be supported.

Optimum Control for HVAC Facilities

Significant Energy Saving Realized!!

fluctuates generally in seasons or days and nights. Therefore, operations continuing in a water conveyance pressure constant control may lead to high operating unnecessary pressures on terminals at low operating state. Thus, the pump consumes an ineffectual electric power for maintaining the high water conveyance pressure.

FRENIC-HVAC can perform an estimated terminal pressure control by linearization function which estimates target pressure from load flow rate.
It is possible to reduce the ineffectual pump power consumption and to achieve a great energy-saving effect together with maintaining comfortable current air conditioning.

Cooling tower fan

The cooling tower fan is used to cool the heat of cooling water by emitting it into the air. The fan speed is adjusted optimally according to the cooling water temperature at the outlet. Moreover, the inverter estimates the wet-bulb temperature automatically to control the fan so that the temperature of cooling water (wet bulb) is interlocked to the air temperature. (Wet-bulb temperature presumption control)

Cooling water pump

The cooling water pump circulates the cooling water to the cooling tower in order to cool the heat generated by the freezing machine. The pump speed is adjusted optimally according to the temperature and flow rate of cooling water. Moreover, the inverter can control the cooling pump so that the difference of cooling water temperature at between the inlet and outlet becomes always constant. (Temperature difference constant control)

Chilled water pump

The chilled water pump circulates the chilled water generated with the freezing machine to the air
conditioner and fan coil. The pump speed is adjusted optimally according to the header pressure. Moreover, the pump conveyance pressure can be controlled to proper value by converting the flow rate signal to the target pressure using the linearization function. (Linearization function)

Supply fan/Return fan

The speed of supply and return fans is adjusted optimally according to the pressure, discharge temperature, room temperature, and others. Moreover, the highest level of carbon dioxide is selected automatically by detecting the level in room to control it to stay within the allowable level.