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CE2N2462E / 09.12.1998 Siemens Building Technologies
4/8 Landis & Staefa Division
In the case of flow temperature control with a mixing valve, d.h.w. heating is ensured
with a charging pump.
With boiler temperature control, the d.h.w. is heated either with a charging pump or
changeover valve. In the case of a charging pump, priority selection can be used:
Absolute priority: during d.h.w. heating, the heating circuit pump is locked
No priority (parallel): heating circuit pump and d.h.w. charging pump operate at the
same time
The temperature is measured with an immersion detector LG-Ni 1000
at 0 °C. If the
detector acquires a d.h.w. temperature below the setpoint, the charging pump or
changeover valve will be activated. The excess flow temperature during charging is
16 K (fixed value) above the adjusted d.h.w. temperature setpoint.
The d.h.w. storage tank is protected against frost. If there is risk of frost, the d.h.w. tem-
perature will not be allowed to fall below 5 °C.
The d.h.w. temperature can also be acquired by a thermostat. Charging takes place
when the thermostat's contact closes. There is no protection against frost.
Note: a relay controlled by the thermostat (low voltage!) must be connected to terminals
B3-M.
The heating circuit pump is activated to prevent freeze-ups in the plant. Frost protection
can be provided with or without an outside detector:
With outside detector:
Outside temperature
1.5 °C: the heating circuit pump will be switched on for 10
minutes at 6-hour intervals
Outside temperature
5 °C: the heating circuit pump runs continuously
Without outside detector:
Flow temperature
10 °C: the heating circuit pump will be switched on for
10 minutes at 6-hour intervals
Flow temperature
5 °C: the heating circuit pump runs continuously
Frost protection for the plant can be deactivated, if required.
Frost protection for the building acts as minimum room temperature limitation and pro-
tects the rooms from too low temperatures. It can be achieved with or without room unit,
provided the heating curve slope is correctly set.
Without room unit:
Attenuated outside temperature
5 °C: the control is switched on and the flow tem-
perature is controlled such that a room temperature of 5 °C will be maintained
Attenuated outside temperature >6 °C: the control is switched off
With room unit and with quick setback active:
Room temperature
5 °C: the control is switched on and the flow temperature is
controlled such that a room temperature of 5 °C will be maintained
Room temperature >6 °C: the control is switched off
With room unit, but without quick setback:
Same as without room unit
Frost protection for the building can be deactivated, if required.
Pump overrun: heating circuit pump and charging pump with six minutes overrun
Pump kick: all pumps are periodically switched on for one minute
When changing from the reduced temperature or standby mode to the normal tem-
perature, the room temperature setpoint is raised by 5 K. When the room temperature
reaches a level which lies 0.25 K below the setpoint of the normal temperature, boost
heating will be switched off.
Boost heating necessitates a room unit.
When changing from the normal temperature to the reduced temperature or standby
mode, the heating will be shut down until the respective room temperature setpoint is
reached.
Quick setback necessitates a room unit. This function can be deactivated, if required.
The ECO automatic energy saver controls the heating depending on demand. It
switches the heating off if permitted by outside temperature conditions while considering
D.h.w. heating
Frost protection for
the plant
Frost protection for
the building
Pump control
Boost heating
Quick setback
ECO automatic energy
saver
4


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