Dhw Tank Functions (With Dhw Kit Or With Integrated Dhw Models) - Fujitsu WATERSTAGE WS A050DD6 Series Maintenance Document

Split system single phase type
4.3.10
models)
DHW charging at the nominal setpoint temperature
(1610) always takes place in two stages. In the first
stage, only the heating pump heats the DHW tank.
The power supplied during this time is at its peak.
Then, when the heat pump is no longer able to supply
Charging Control
Line no. Programming line
5024 Switching differential
5030 Charging time limitation
Switching differential :
If the DHW temperature is lower than the current
setpoint minus the differential set here, the DHW
charging process is launched.
It ends when the temperature reaches the current
setpoint.
Information:
Forced charging is triggered on the first DHW
release of the day.
Charging is also launched when the DHW
temperature is within the differential, and as long as
it is not less than 1K above the setpoint.
Charging time limitation
During charging, the room heating may be stopped
or insufficient. Therefore it is often advisable to limit
the charging process timewise to enable heating.
If "- - -" has been selected the charging time
limitation will be deactivated. The DHW will be
heated to the nominal setpoint, even if the room
Recooling
Line no. Programming line
5055 Recooling temp
5057 Recooling collector
Recooling temp :
An activated "Recooling" function remains active until
the set recooling temperature in the DHW storage
tank is reached.
Maintenance Document 1589-3
DHW Tank Functions (with DHW kit or with integrated DHW
enough heat to reach the setpoint value, it switches
on the DHW tank auxiliary if authorised. The auxiliary
will be cut off when charging is complete.
While the DHW tank charging process via the electric
auxiliary is finishing, the heat pump resumes heating.
heating has not received enough power in the
meantime.
If a value between 10 and 600 is selected, charging
will be suspended after the time period set in
minutes, and will remain suspended over that time
before resuming. The generator power remains
available in the meantime to heat the room. This
cycle is repeated until the DHW nominal setpoint
has been reached.
Information:
When the room heating is stopped (summer mode,
economy function, etc.), DHW charging remains
active, regardless of the setting.
Recooling collector :
When the collector is cold, surplus energy can be
emitted to the environment via the collector's
surfaces.
73