Fujitsu WATERSTAGE 112 Maintenance Document page 77

Heat Pump, Split System, Single Service, 3 phase
24-Hour heating limit
The 24-hour heating limit is used to switch the
heating on and of in the course of the day, depending
on the outside temperature.This function is used
mainly during intermediate seasons (spring and fall)
to react rapidly in case of fluctuating temperatures.
Changing the input value makes the respective
heating periods shorter or longer.
If the value is increased: changeover to
-
heating mode is advanced; changeover to ECO is
delayed.
If the value is decreased: changeover to
-
heating mode is delayed; changeover to ECO is
advanced.
Flow temperature setpoint
Line no.
HC1 HC2
740 1040
741 1041
This limitation allows to define a range for the orders
to start. When instructed to start the heating circuit
reaches the threshold,
Room Influence
Line no.
HC1 HC2
750 1050
Control types:
When using a room temperature sensor there are 3
different types of control to choose from.
SETTING
- - - %
1...99 %
100 %
* Requires the connection of an outdoor sensor
Simple control according to outdoor conditions
The flow temperature is computed via the heating
curve according to
temperature.
This type of control requires proper adjustment of the
heating curve, as the control does not take the room
temperature into account for this adjustment.
Maintenance Document 1394-1
Comfort heating setpoint (710)
24-Hour heating limit (732)
Changeover temperature (710 – 732)
Heating off
Differential (Fixed)
Changeover temperature Heating on
Programming line
Flow temp setpoint min (for fan convectors)
Flow temp setpoint max
this record remains
Programming line
Room influence
CONTROL TYPE
Simple control according to outdoor conditions *
Control according to outdoor conditions with room influence *
Control according to room temperature only
the averaged outdoor
Thus, in the following example the changeover
temperature will be 18°C, computed as follows:
22°C
-3°C
=19°C
-1°C
=18°C
Information:
This function will not work in "Continuous Comfort
temperature" mode.
The display will show "ECO".
The outdoor temperature is attenuated to take the
building's thermal dynamics into account.
permanently at the maximum or minimum, even if the
heat demand continues to increase or decrease.
Control according to outdoor conditions with
room influence
The difference between the room temperature and
the setpoint value is measured and taken into
account for temperature control. This enables taking
into account possible heat inputs and ensures a more
even room temperature.
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