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Siemens Building Technologies CM2N3204E / 1.1999
Landis & Staefa Division 5/20
20
22
24
26
18
16
14
12
t
Nmin
T [˚C]
R/A
t
T
T
R
A
Room temperature
limit
(DtPnt 12)
Outside temperature
limit
(DtPnt 13)
Night purging active
(DtPnt 15)
End of
occupancy time
Beginnning of
occupancy time
Delta
(DtPnt 14)
3204D04E
This function enhances comfort and optimizes energy consumption in rooms with vary-
ing occupancy levels. An integral CO
2
/VOC controller reduces the CO
2
or CO
2
/VOC
concentrations in the space. The P-band, the switching values for the fan speeds and
the design value at full occupancy are adjustable; the switching differential is 160 ppm.
Using the detectors connected to signal inputs Z, B1 and B2, the controller acquires the
actual temperature and CO
2
values. If the CO
2
or CO
2
/VOC concentrations in the
space exceed the switching value of fan speed I + ½SD, the temperature controller is
activated and the fan will run at speed I. The temperature controller maintains the prese-
lected setpoint (Comfort or Economy). If the CO
2
or CO
2
/VOC concentrations increase
further, fan speed II will be activated. Between this function and the step output of the
time switch program, maximum value selection takes place, with both functions having
the same priority. In the case of systems with recirculated air dampers, the damper
control function is activated also. Here, Y30 minimum limitation, recirculated air startup
mode and the frost protection controller with a higher priority act on the Y30 control sig-
nal.
Integral limit controller for HR equipment such as thermal wheel type heat exchangers,
plate heat exchangers, and glycol circuits: setpoint, P-band and integral action time are
adjustable. The limit controller is active only when the plant is in operation (fan speed I
or II).
Using the detectors connected to signal inputs Z, B1 and B2, the controller acquires the
actual temperatures. The manipulated variables delivered by the integral limit and tem-
perature controllers are compared with one another with the help of a priority selector,
which selects the manipulated variable with the smallest value (minimum selection).
This manipulated variable reduces the output of the HR equipment. Since a certain
amount of heat is not now available from the HR equipment, the balance is delivered by
a downstream air heater battery (terminal Y10).
For ventilating and air conditioning plants using hot water heating coils:
all values for frost protection (response temperatures, setpoints, P-bands, and integral
action times) are preset and can be changed. The temperature is acquired either in the
water circuit or at the air outlet of the hot water heating coil.
The protective actions are the following:
continuous opening of the heating valve, activation of the hot water circulator
deactivation of the fan or closing of the air dampers
maintaining the temperature when the fans are deactivated (only on the water side,
setpoint «Standby controller»)
fault status signal when there is risk of frost
Use of the following detectors is a prerequisite:
QAE22... or QAD22 for frost protection on the water side.
QAF63.2, QAF63.6 for frost protection on the air side.
Function diagram
Demand controlled
ventilation
Anti-icing protection for
HR equipment
Frost protection
(on the water or air side)
5


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