Flow Temperature Setpoint Limitations - Siemens Albatros2 User Manual

Summer comp start at OT
Summer comp end at OT
Summer comp setp
increase

Flow temperature setpoint limitations

Flow temp setp min at
OT 25 °C
Flow temp setp min at
OT 35 °C
90/221
Siemens Switzerland Ltd
HVAC Products
918 Summer comp start at OT
919 Summer comp end at OT
920 Summer comp setp 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 the outside temperature.
The resulting room temperature setpoint (cooling) can be displayed on the info level.
Summer compensation starts to take effect at the outside temperature set here. If the
outside temperature continues to rise, the Comfort setpoint is raised continuously.
Summer compensation takes full effect at this outside temperature (920). The Comfort
setpoint is not affected by any further increase in the outside temperature.
This setting determines the maximum permissible increase in the Comfort setpoint.
TKw
902
918
TKw Comfort setpoint
TA Outside temperature
Line no. Operating line
923 Flow temp setp min OT 25°C
924 Flow temp setp min OT 35°C
A low limit can be defined for the flow temperature required for cooling.
The limit curve is determined by defining 2 fixed points.
There is also a low limit for the resulting flow temperature setpoint, which must not fall
below 5 °C.
This determines the lowest permissible flow temperature at a composite outside
temperature of 25 °C.
This determines the lowest permissible flow temperature at a composite outside
temperature of 35 °C.
If there is no valid outside temperature available, the controller uses the value
"Flow temp setp min OT = 35 °C".
User manual RVS61.843
6 The settings in detail
920
TA
919
CE1U2355en_02
23. November 2007