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Hitachi Appliances, Inc.

Hitachi

Set-Free FSN2 (High efficiency Type VRF)

SET-FREE FSN2 Advantages Energy Saving Thanks to Hitachi's unique energy-saving technology such as the high-efficiency DC inverter compressor, industry-leading COP has been achieved. Easy lnstallation lntegrated compact design for all models of outdoor units. Slm pllfies in stallation an d in cre ases the flexibility of location. In addition, the maximum piping length was extended from 300m to 1,000m, further im proving flexibility in design. Wide Product Range 4 types and 21 models of outdoor units 7 types and 39 models of indoor units Comfort Fine temperature setting and noise reduction technology for comfortable air conditioning. Reliability Hitachi's long scroll compressor experience ensures greater reliability. Control by Network System

Energy-saving and Comfort

Providing the Highest-ever COP in the SET-FREE Series

Various cooling circuit technologies and new R410A DC inverter compressor achieve an industry-leading level of efficiency and energy-saving performance.

COP of 4.0 or higher achieved by 7 models in the FSN2 series (50Hz)
Comparison of average cooling/heating COP with Hitachi FSN1 series (current model series).

New Type DC Inverter Scroll Compressor

Improved Intermediate Pressure Performance

The intermediate pressure performance is drastically improved by using a release valve and optimizing orbiting scroll lifting force in the improved new compression mechanism, therefore intermediate pressure performance is largely improved for energy-saving.

Relese Valve Adoption Prevents from Overcompression

Orbiting Scroll Lifting Force Optimization is Improved Leakage Loss Reduction

Large Capacity Constant Speed Compressor

Large capacity constant speed compressor is equipped with over 22HP outdoor units to reduce the number of compressors.

Use of Supercooling Circuit

By using a supercooling circuit for the refrigeration cycle and optimizing the piping system, the performance is greatly improved.


  1. Reduced piping pressure loss in the unit
  2. Optimized expansion valve control
  3. Optimized heat exchanger
    • 2-gas, 1-liquid pass arrangement
    • Subcooler in front

Supercooling circuit adopted
Piping pressure loss decreased by subcooling in liquid pipe.

High-Efficiency Heat Exchanger

  • Compact design and high-efficiency by arranging narrow heat exchanger tubes in 3 rows
  • Newly-Developed High-Efficiency Heat Transfer Fin
  • Heat Exchanger Configuration Aimed at Fluid Loss Reduction

Improved Heat Transfer Capacity Air Ventilation Resistance Improved Heat Transfer Tube in Fin

Double DC Fan Motors

Double DC inverter-driven fan motors are provided in the 2-row and 3-row cabinet. High-efficiency, low noise operation is realized.

Super High-Stream, High-Efficiency Fan

  • New "4-Blade Super-Stream Fan" with Φ710 Diameter
  • Reduction of Fan Motor Input Power Consumption, Rotation Speed and Noise (Rotation Speed Reduction is approx. 25％.)

Duct Type Shroud

A High-efficiency fan is realized by adopting duct type shroud structure.

Capacity Control by 1 Hz, The Only One in The Industry

Performance is greatly improved by the high by high efficiency DC inverter compressor and 100% load compressor, lossless energy-saving operation is achieved (depending on the building).

Precise Temperature Setting

By properly controlling the refrigerant quantity by an electronic expansion valve, the temperature can be finely set.

Wide Working Range

SET-FREE FSN2 can handle a wide rainge of outside air conditions, thus extending the flexibility of installation space and climatic environment.

Self-demand Control

Self-demand Control
A newly developed self-demand function has largely improved energy-saving effects. Since the current is self-detected and demand control performed automatically, no signal wiring work is required. Conventional demand control using demand signals is also available, and you can select various operations as required.

Wave Mode
Wave mode equipped to turn demand control ON and OFF alternately at intervals of about 20 min. or 10 min.While power is saved without fail, temperature changes are also minimized to maintain a comfortable room temperature.

Flexibility of Installation

More Flexible Refrigerant Piping Works

Improved flexibility of design by increasing the pipe length to 165 m max. (equivalent length of 190 m) in FSN2 series.

  1. Max.pipe length: 165m*1
  2. Between first branch and indoor unit: 90m or less
  3. Height diference between highest and lowest indoor uniat: 15m or less
  4. Height difference between outdoor and indoor units: 50m*2
  5. Max. length after branch: 40m
*1
For 100m or more, the pipe diameter will be one size larger.
*2
In case the outdoor unit is snstalled at a higher level than indoor units. If the outdoor unit is installed lower than indoor units, the maximum height difference is 40m.
More Flexible Refrigerant Piping Works
  Current Model (FSN1) Model (FSN2)
Total maximum piping length 300 m 1,000 m
Max. piping length 150 m 165 m
Between first branch and indoor unit 40 m 90 m
Max. piping lengtn after branch 30 m 40 m

Integrated Design Provides Transportation Time Saving

Only one crane operation is required for installation.

Easy Installation

HITACHI's integrated design for all outdoor unit models allows for easy installation and high reliability by minimizing piping connections.

Module Unit HITACHI SET-FREE FSN2 (Integrated Unit)

Other Advanced Technologies

Emergency Mode Operation from Remote Control Switch

If compressor/fan motor fails, an emergency operation mode can be selected from the remote control switch. Even if the compressor fails, air-conditioning operation continues until troubleshooting is performed.

NOTES
*
An "Abnormal Outdoor Unit Fan" error message is available only for units equipped with multiple fans.
*
The emergency operation is not affected by the failure of the inverter PCB or fan controller.
*
The Emergency Mode is available only with the PC-AR.

New Function for Adequate Refrigerant Quantity Measurement

A New function for adequate refrigerant quantity measurement is adopted for all unit models. If refrigerant leakage occurs or refrigerant piping length is inadeguate, this function measures the adequate refrigerant quantity by refrigerant cycle pressure or temperature. This function is of practical use for adequate refrigerant charging at test run or servicing.

Refrigerant Cycle Configuration

NOTES
*
Refirigerant over-charging is not detected. Over-chargeing can be detected by gradually adding refrigerant from the under-charged state at test run or when refrigerant leakage occurs.
*
This function not provide automatic refrigerant charging.
*
The adjustment (estimate) is changed according to the operation condition (the numner of operationg units and temperature).

Protection for Cold Draft at Cooling Operation

This function is to protect the cold draft while cooling operation at intermediate season or low temperature. This function provides comfortable air conditioning.

Wide Product Range

SET- FREE FSN2 can handle a wide range of outside air conditions,thus extending the flexibility of installation space and climatic environment.

Wide Product Range
Refrigirant
(Number of models)		 Capacity Range ［HP］
8
10
12
14
16
18
20
22
24
26
28
R410A (21 models)
Wide Product Range
Refrigirant
(Number of models)		 Capacity Range ［HP］
30
32
34
36
38
40
42
44
46
48
R410A (21 models)

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