Hitachi 7E300020, Технический каталог, Страница: 48 / 158

2. Features and benefits
TCGB0075 rev.0 - 11/2012
48

Anti-Legionella protection (Optional function)
In order to prevent against Legionella into the DHW system, it is available a specific setting which will raise up the DHW
periodically over the normal DHW tank temperature setting.
The following parameters should be configured for the Anti-Legionella function:
• Operation interval: Day(s) of the week at which
the domestic water should be heated.
• Status: Defines whether the disinfection
function is turned ON or OFF.
• Start time: Time of the day at which the DHW
should be heated.
• Anti-Legionella temperature: High water tempe-
rature to be reached.
• Interval: Time period during the Anti-Legionella
temperature remains constant.
Anti-Legionella
temperature
set-point
Time
DHW setting
temperature
N O T E
For more details about the Anti-Legionella optional function protection, please refer to the Service Manual.

Maximum water set-point by the installer
The installer can set a maximum water tank temperature in order to avoid excessively hot water in the DHW tank.

Two different modes for DHW
The DHW operation will be performed by two different modes:
• Standard mode: The DHWT will start heating when the water tank temperature is low enough for heat pump to be
started. In this mode, the DHW is always heated by the heat pump.
• High demand mode: The DHWT will start heating if the difference between the maximum water set point temperature
and the actual DHW temperature is bigger than a predetermined value. Only the water tank electric heater will start
heating unless DHW temperature goes below the heat pump starting temperature.

Unit timer
NEW
Unit timer is provided in the unit (by the LCD user’s interface) for heating space, for the DHW and for the swimming pool in
order to enable/disable the operation depending on the day or the time slot. It can be programmed each day of the week.
N O T E
For more information, please refer to the Service Manual.

Combinability with solar panel
As it has been explained in section Selection benefits , the air to water heat pump can be combined with solar panel. The
solar combination will enable to heat up the DHW by means of the sun. The solar combination is designed to transfer the
heat from the solar panels (sun radiation) to the heat exchanger of DHW tank.
N O T E
Not available when the HITACHI domestic hot water tank is integrated over the indoor unit.