Operation Manual

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Siemens Schweiz AG User Manual CE1U2354en
HVAC Products Cooling circuit 23. August 2007
Cooling curve
Line no. Operating line
908 Flow setpoint at outside temperature of 25°C
909 Flow setpoint at outside temperature of 35°C
The controller determines the required flow temperature at a specific composite outside
temperature. The cooling curve is determined by defining two fixed points (the flow
temperature setpoint at 25°C and 35°C).
The programmed cooling curve is based on a room setpoint of 25°C. If the room
setpoint is adjusted, the cooling curve automatically adapts to the new value.
TVKw
20 30
40
28
26
24
22
20
18
16
°C
TAgem
30
2354Z15
°C
25 35
TVKw Flow temperature setpoint, cooling
TAgem Composite outside temperature
ECO
Line no. Operating line
912 Cooling limit at OT (outside temperature)
913 Locking period at end of heating
If the composite outside temperature rises above the cooling limit temperature, cooling
is enabled; cooling is disabled when the outside temperature drops to at least 0.5°C
below the cooling limit temperature.
To avoid too rapid a change to cooling at the end of the heating phase, the cooling
function is disabled for the period which can be set here. This "locking period" begins
when there is no heating demand from heating circuit 1.
The locking period is ignored if the cooling function is enabled via the operating mode
button.
Summer compensation
Line no. Operating line
918 Start of summer compensation at OT
919 End of summer compensation at OT
920 Summer compensation setpoint increase
In summer, the cooling comfort setpoint (902) is shifted upwards as the outside
temperature increases. This saves cooling energy, and prevents too great a differential
between the room and outside air temperature.
Flow temperature
setpoint
Cooling limit at TA
(outside temperature)
Locking period at end of
heating