72
Monobloc Outdoor Unit Installation Manual
10.7.3 DHW electric heater:
When the unit is requested to run in DHW mode, the DHW electric heater (if configured) can be used in order to
provide domestic hot water.The discrete output can control a contactor (not supplied with unit).
Characteristics
Contactor Coil:
230 VAC
50Hz
Electrical connection
Refer to Installation with DHW production example
Configuration
Refer to Installation with DHW production example
The electric heater is started when the tank temperature is below the DHW setpoint and one of the following
conditions is true:
•
OAT is below Booster OAT Threshold [P604]
•
OAT is above Maximum OAT for Heating [P515]
•
Anti-legionella mode is active
•
Defrost is active
•
In case of unit of failure
IMPORTANT: Electric heating is disabled when Off Peak or Load Shedding is active or in the case of DHW
thermistor sensor failure (refer to “Possible switches to install on system”).
10.7.4 Domestic water tank:
The water inside the domestic water tank must be constantly controlled in order to minimize the risk of any
contamination, including legionella bacteria. Bearing this in mind, it is important to inform the user about the
significance of water temperature control.
Water tank protection system:
The system is scheduled to heat up water in the domestic hot water tank in order to eliminate the possibility of
legionella growth or kill any existing bacteria.
Legionella will not survive if the temperature is above 50°C. The risk of contamination is practically non-existent
when the water temperature is set to 60°C.
Water tank protection settings:
To protect the domestic water tank against legionella bacteria, the following parameters must be set:
•
Anti-Legionella Start Day of Week [P714]
•
Anti-Legionella Start Time [P715]
•
Anti-Legionella Water Setpoint [P405] (anti-legionella protection is stopped when the water temperature
reaches the pre-set temperature)
10.7.5 DHW limitation mode:
DHW limitation mode [P543] reduces noise levels, by reducing the compressor frequency when DHW mode is
active. For configuration, refer to Installation with DHW production example.
