TECHNICAL PASSPORT INSTALLATION and OPERATION MANUAL
28-EN
state. When WUW priority mode is on the main the letter B is show in the lower right
corner of the display.
ATTENTION: The boiler should have non-return valves mounted on the
central heating pump circuit and the hot consumption water pump circuit.
A valve mounted on the WUW pump will prevent domestic hot water from
being drawn from the water heater.
10.9.3. Parallel pumps
In this mode, both pumps are running simultaneously given that the pump activation
temperature is reached (set by default to 35°C). The central heating pump runs all
the time, while the domestic hot water WUW pump stops after the set point
temperature is reached. The pump is then reactivated once when the temperature
drops by 2°C. Changing the desired DHW temperature can be done by pressing
button EXIT (holding down for a few seconds). The display will show the WUW
temperatures screen. Set temperature can be changed with the buttons UP and
DOWN. After few seconds the display will return to its previous state.
ATTENTION: In this mode, a non-return valve should be fitted to maintain
different temperatures in the water heater and in the house.
After activation of the parallel pumps function, three items appear on the display.
Starting from the left, these are:
Boiler Temperature (CH); Domestic Hot Water Temperature (WUW) and SET point
Temperature (SET). When parallel pumps mode is activated the letter R is shown in
the lower right corner of the display.
10.9.4. Summer mode
When the function is enabled, only the WUW pump is running in order to heat the
water for domestic use. The pump is switched on upon reaching a predefined
activation threshold (see the pump activation temperature function) and will run
until the set point temperature has been reached. The pump will start again when
the temperature drops below the set hysteresis. While in the Summer Mode, the
letter L is displayed in the bottom right corner of the main screen.
