Fujitsu WGYA050DG6 Design & Technical Manual page 163

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DHW storage tank functions
DHW charging at the nominal setpoint temperature
(line 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
Charging Control
LINE FUNCTION
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.
Recooling
LINE FUNCTION
5055 Recooling temp
5057 Recooling collector
Recooling temp
An activated recooling function remains in operation
until the set recooling temperature in the DHW
storage tank is reached.
supply enough heat to reach the setpoint value, it
switches on the DHW tank heater if authorised. The
heater will be cut off when charging is complete.
While the DHW tank charging process via the
electric heater is finishing, the heat pump resumes
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
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.
- (CS01 - 47) - - (CS01 - 47) -
Control system