Siemens RDG20 KN Series Basic Documentation page 40

Functions
4
Room temperature setpoints
Cooling setpoint tracking
depending on outside
temperature (P255)
Current setpoint
Clarification concerning
current setpoint in Comfort
mode
2-pipe with P010 = 1 or
4-pipe with P010 = 1 and
P001 = 3
4-pipe with P010 = 1
40 | 180
is not too great. If the outside temperature is higher than 26 ° C and 6 K above the
Comfort cooling setpoint, the related setpoint is shifted and kept 6 K below the
outside temperature. This function can be enabled or disabled via P255.
The current setpoint (used by the thermostat for temperature control) is available
on the bus for use in the central control unit.
The Comfort setpoint w (e.g., customer setting on the display) and the current
setpoint w2 (used by the thermostat for temperature control, but not displayed) are
handled differently depending on the selected application and setting.
Both the Comfort setpoint w and current setpoint w2 have the same value.
Heating mode
The Comfort setpoint w (value selectable by e.g., rotary knob) is in the middle of
the dead zone (P055). The current setpoints w2.. (used by the thermostat for
temperature control) are at the boundaries of the dead zone.
w2h = Comfort setpoint (w) – ½ dead zone (X
w2c = Comfort setpoint (w) + ½ dead zone (X
Cooling mode
)
dz
)
dz
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