Dhw Functions (With Dhw Kit Or With Integrated Dhw Models) - Fujitsu WATERSTAGE WOYG160LJL Maintenance Document

▼ DHW Functions (with DHW kit or with integrated DHW models)

The control sets the DHW temperature, according to the
time program or continuously, to the desired setpoint.
The priority of DHW charging over room heating is
adjustable in this case.
The controller has a confi gurable legionella function
designed for protection against legionella in the storage tank
and the pipes. The circulation pump is controlled according
to the current time program and operating mode.
Setpoint value
Line Nr Programming line
1610 Nominal setpoint
1612 Reduced setpoint
DHW reduced setpoint
The DHW is heated to various setpoint values. These
setpoints are active according to the selected operating
mode and allow the desired temperatures to be reached
in the DHW storage tank.
Important
For optimal operation we recommend reducing the
setpoints to the lowest value.
Setpoints which are too high may interfere with heating
and cause some discomfort. In this case DHW/Heating
changeover cycles may successively occur.
If DHW charge boosting is not desired during the day,
we recommend adjusting the reduced temperature
setpoint to 15 °C. Full charging will occur during the
night at the nominal temperature.
- 78 -
Comfort setting DHW max setpoint
Release
Line Nr Programming line
Release of DHW load
(24h/day / Heating circ time pgm /
1620
Time program 4/DHW / Low-tariff /
Time pgm 4/DHW or Low-tariff )
24h/day
(Not recommended)
Regardless of the time programs, the temperature of
the domestic hot water is continuously maintained at
the DHW nominal setpoint temperature.
Example
Heating circuit time programs
Depending on the heating circuit time programs,
the DHW setpoint is changed between the DHW
temperature nominal setpoint and the DHW temperature
reduced setpoint. The fi rst switch-on point of each
phase is advanced by one hour each time.
Example
Time program 4 / DHW
Time program 4 of the local controller is taken into
account for the DHW mode. The changeover between
DHW nominal setpoint and DHW reduced setpoint
occurs on the changeover times of this program.
Thus, domestic hot water charging takes place
independently from the heating circuits.
Low tariff
Released when the low tariff input is active (Input EX2)
Time pgm 4/DHW or low tariff
Released when DHW program 4 is set to "Nominal" or if
the low tariff input is active.
Waterstage / Maintenance Manual / 2105 - EN
(Not recommended)
(Recommended)