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6.3.1 DHW program operating modes
DHW programs operate differently according to
the type of domestic hot water system:
• With combination boilers (boilers that
produce domestic hot water instantaneously
on demand) the DHW program switches
between the following operating modes:
– On: if the Eco button on the boiler is not lit,
hot water is available immediately on
demand (Comfort mode). Solid segments
on the display indicate the period for which
the operating mode is active.
– Off: the built-in water heater in the boiler is
not kept constantly hot (Eco mode); as a
result energy is saved. In Eco mode, the hot
tap has to be run for a short while before
the water becomes hot. Blank segments on
the display indicate the period for which
the operating mode is active.
• With appliances connected to a domestic hot
water tank, the DHW program specifies the
desired water temperature (specified
temperature).
– If the temperature measured in the
domestic hot water tank is below the
specified temperature, the tank is re-
heated.
– Once the specified temperature is reached
(or exceeded), tank heating is stopped.
The segments on the display show
the periods for the following
domestic hot water temperature
requirements:
≥ 122 °F (≥ 50 °C) – solid
segments
≤ 68 °F (≤ 20 °C) – no segments
other – blank segments
If the DHW program changes from a
higher to a lower specified
temperature, the water in the tank
will not immediately cool to the
lower temperature, i.e. water at a
higher temperature will continue to
be available for some time.
However, the tank will not be
reheated until the temperature falls
below the new, lower specified
temperature.
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