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Siemens Building Technologies
Basic Documentation QAA73.110 Room unit
CE1P2284en
HVAC Products
Description
of the heating engineer settings
10.07.2002
During occupancy hours, the heating is maintained at the nominal level. Towards the
end of the occupancy time, the control switches to the reduced level.
Optimization calculates the changeover time such that, at the end of occupancy time,
the room temperature will be 0.5 °C below the nominal setpoint (early shut-down).
Optimum stop control only acts on the last occupancy period of the day.
D.h.w.
4.21 Reduced setpoint of the d.h.w. temperature
Reduction of the d.h.w. temperatures outside main occupancy times.
The time switch integrated in the room unit automatically switches between main and
secondary occupancy times.
D.h.w. is at a high temperature level only if required. This saves energy by reducing the
temperature when not in use.
1. Press the line selection buttons to select line 90.
2. Press the + / – buttons to adjust the reduced setpoint of the d.h.w. temperature.
Setting range
Unit
Factory setting
8...TBWw
°C
40
TBWw
Nominal d.h.w. temperature setpoint
The temperature setpoint during reduced d.h.w. operation will be changed.
0 10 20 30 40 50 60 70 80 90 100 120 130 140 °C
228
4Z2
3
90
130
7
7
Nominal d.h.w. temperature setpoint
90
Reduced setpoint of the d.h.w. temperature
130 Maximum nominal setpoint of d.h.w. temperature
D.h.w. heating has 2 different setpoints that can be used:
•
Nominal d.h.w. temperature setpoint
Produces the d.h.w. temperature required during the main occupancy times
•
Reduced setpoint of the d.h.w. temperature
Produces the d.h.w. temperature required outside the main occupancy times
The periods of time during which these d.h.w. temperature setpoints shall be used can
be set on line 91.
4.22 Release of d.h.w. heating
Makes it possible to limit the period of time during which d.h.w. heating at the nominal
setpoint is released. D.h.w. heating at the nominal setpoint can thus be released as
required by the users.
Note
Description
Line 90
Effect
D.h.w. temperature
setpoints
Description
