Hitachi Room Air Conditioner “Stainless Clean Shirokuma-kun” New E Series / W Series/ G Series Products to Include “Frost Wash” Technology

More New Models to Launch with Popular New Automated Heat Exchanger Cleaning Technology

February 27, 2018
Johnson Controls-Hitachi Air Conditioning

[Products for Japanese market only]
Only for reference. This press release is for Japan market only.


Johnson Controls-Hitachi Air Conditioning (CEO: Franz Cerwinka), from early March, is starting the launch of a total of 22 new products in the “Stainless Clean Shirokuma-kun” New E Series / W Series/ G Series (hereafter E Series / W Series / G Series) equipped with the “Frost Wash” technology designed to automatically clean the heat exchanger periodically through the year by washing away* the attached dust and grease that may be one cause of noxious odors. The process is accomplished by automatically freezing and then rapidly thawing the heat exchanger, one of the components inside the air conditioning unit.

The “Frost Wash” technology automatically and regularly (*1) cleans the heat exchanger, a component which is difficult to clean by hand, throughout the year to ensure the inside of the air conditioner remains in a sanitary condition. This innovative new technology operates year-round to remove dirt that could not be removed using the previous heat exchanger coating method which harnessed the water created during the cooling or dehumidifier cycle (*2).

The technology was first incorporated into residential air conditioners for the domestic Japanese market with the launch of the “Stainless Clean Shirokuma-kun” Premium X Series in October 2017.

The “Stainless Clean” system, Hitachi’s proprietary system which harnesses stainless steel to achieve disinfectant action (*3) has been incorporated into the E Series and W Series models. This system will also be incorporated into the G Series product lineup.

In addition to this, all three series will feature the “Frost Wash” capability, which further expands the cleaning ability inside the air conditioner.

The E Series and W Series models will for the first time include “Frost Wash Standard”, and the G Series models will be equipped with “Frost Wash Light”. “Frost Wash Standard” includes the automatic cleaning function that makes use of the “Kurashi Camera” while “Frost Wash Light” focuses on the basic functions of regular automatic washing and manual washing. In each of the respective series, a range of functions are available for selection according to the customers’ needs (Fig.1 Features comparison of the E Series / W Series / G Series).

The Kurashi Camera included in the E Series and W Series detects the number of occupants in the room and their position, and only operates the automatic cleaning procedure when the room is unoccupied.

*Not all dirt can be removed.


Fig.1 Features comparison of the E Series / W Series / G Series

(*1) This function may not operate in certain environments.
(*2) Comparison with our company’s previous W series model (2016 model)
(*3) The unit does not disinfect the air emitted from the unit. 
●Organization conducting tests: Boken Quality Evaluation Institute ●Test method: Based on JIS Z 2801 quantitative test (film adhesion method)  ●Test scope: Disinfection of bacteria found on and collected from various components including air flow duct, flaps, fans, and heat exchanger. Amount of bacteria eliminated assessed after 24 hours.
(*4) Kurashi Camera: This device detects the position of people, their degree of movement, distances within the room, and sunlight. The Kurashi Camera F can also detect the position of people’s feet.
AI is an abbreviation of Artificial Intelligence. The camera identifies people in the room, and uses AI to predict the occupant’s likely perception of room temperature based on the amount of time they have already spent in the room. Kurashi Camera AI is equipped with this functionality.

■Hitachi Room Air Conditioner website

■Product Lineup
Room Air Conditioner “Stainless Clean Shirokuma-kun” E Series


Room Air Conditioner “Stainless Clean Shirokuma-kun” W Series

Room Air Conditioner “Stainless Clean Shirokuma-kun” G Series

by Hitachi Cooling & Heating
27 Feb 2018

How can we help you?