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Siemens Building Technologies CE1N2527E / 04.03.1999
Landis & Staefa Division 3/8
With weather-dependent control, the flow temperature is controlled in function of the pre-
vailing outside temperature via the heating curve. Its basic setting is made with the little
bar on the front of the unit or on an operating line. The room temperature can be read-
justed with the knob.
In addition, following can be entered by the enduser:
– Room temperature setpoints for normal heating, reduced heating and frost protec-
tion/holidays
– Seven-day switching program and a maximum of eight holiday periods per year
– Operating mode
– Time of day and date
– Flow temperature: with one or two (averaging) sensors
– Outside temperature: with Ni or NTC sensor; the RVL469 identifies the type of sensor
used; with interlinked controllers, it is also possible to define the source of the outside
temperature
– Room temperature: with a room temperature sensor or a room unit, or both (averaging)
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The room temperature is included in the control. It can be acquired with a sensor or
simulated by a room model with an adjustable building time constant. When using a
sensor, the effect on the control can be adjusted.
It is also possible to limit the maximum room temperature.
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The heating is switched on and off depending on demand (ECO function). It is swit-
ched off when the amount of heat stored by the building mass is sufficient to maintain
the required room temperature. In that case, the controller takes into account the de-
velopment of the room temperature and the building's heat storage capacity. It is pos-
sible to set two heating limits, one for normal heating and one for reduced heating.
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The control is optimized. Switching on, heating up and shutting down are controlled
such that, during occupancy times, the required room temperature is always main-
tained.
At the end of each occupancy period, the heating will be shut down (circulating pump)
until the room temperature setpoint for the non-occupancy time is reached (quick set-
back, can be disabled). During heating up, the room temperature setpoint can be
boosted (boost heating). It is possible to set maximum limits for the heating up time
and for early shutdown.
Three-position control operates as weather-dependent or load-dependent flow tem-
perature control. P-band and integral action time are adjustable. The flow temperature is
controlled via the regulating unit (control or slipper valve).
Minimum and maximum limitation of the flow temperature as well as maximum limitation
of the rate of setpoint rise are adjustable.
Minimum limitation of the return temperature acts with both three-position control and load-
dependent control of the boiler temperature and helps prevent flue gas condensation.
On the software side, all settings can be locked to prevent unauthorized readjustments.
– The RVL469 has one seven-day time switch for entering the daily occupancy times.
Each day can accommodate three occupancy times, whereby each weekday may
have different occupancy times
– For entering a maximum of eight holiday periods, the RVL469 is equipped with a
yearly time switch featuring automatic summer- / wintertime changeover
– Changeover of operating mode with the QAW50 room unit
– Overriding the major controller functions with the QAW70 room unit
– Selection of another (programmable) operating mode with an external contact
– Preselection of a fixed flow temperature setpoint with an external contact. Type of
setpoint (fixed or minimum) and flow temperature can be selected
Enduser settings
Temperature acquisition
Space heating
Three-position control
Minimum limitation of
return temperature
Locking functions
Time switch
Remote control