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Siemens
Flush-mounted Room Thermostat
CB1N3066en
Smart Infrastructure
2019-10-25
Control sequences
Used in conjunction with a valve, either for heating/cooling with changeover, or heating
only, cooling only.
Heating mode
Cooling mode
w
Y11
w
Y11
T[°C]
Room temperature
SDH
Switching differential “Heating”
W
Room temperature setpoint
SDC
Switching differential “Cooling”
Y11
Control output “Valve”
The valve receives the
OPEN
command via control output Y11 when
1. the acquired room temperature lies by half the switching differential below the
setpoint (heating mode) or above the setpoint (cooling mode), and
2. control output Y11 was not energized for more than the “Minimum output off time”
(factory setting 1 minute)
The valve receives the
CLOSE
command via control output Y11 when
1. the acquired room temperature lies by half the switching differential above the
setpoint (heating mode) or below the setpoint (cooling mode), and
2. control output Y11 was energized for more than the “Minimum output on time”;
(factory setting 1 minute)
Control output Y12 delivers a control command which is inverted to the control
command at output Y11 and which can be used for normally open valves.
When you press the heating/cooling changeover button
, the thermostat changes
from heating to cooling, or vice versa.
If the thermostat is set to ”Cooling only” or ”Heating only” via P22
,
the manual
changeover function on the button is not available (the factory setting of parameter P22
is ”manual changeover”). Instead, “NOP” flashes on the display, indicating continuous
cooling or heating is set respectively.
The minimum output on/off time of Y11 and Y12 is fixed at 1 minute. It means that any
readjustment of the setpoint or of Heating/Cooling Mode changeover lasts for
1 minute before Y11 and Y12 react.
Water-based fan coil
application
ON
OFF
Note:
Heating/cooling
mode
Minimum output
on/off time Y11 and
Y12
