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Siemens
Radiator Control Actuator SSA955
CE1N2700en
Building Technologies
2017-11-09
The SSA955 controls the room temperature based on the data delivered by the central
apartment unit.
When using several SSA955 in one room, the first SSA955 integrated in the room
operates as the lead controller. The other SSA955 are controlled by the lead controller
via the central apartment unit. The multifunction button can be used to query the lead
controller. The multifunction LED indicates when the SSA955 operates as lead
controller.
The binding is used by the SSA955 to sign on at the central apartment unit, thus
integrating it into the RF system. The binding process is triggered via the multifunction
button. It is indicated by the multifunction LED.
Every time a binding is established and every time the batteries are changed, the
SSA955 automatically starts the calibration process. This ensures that the SSA955 will
be optimally matched to the respective radiator valve. The SSA955 informs the central
apartment unit if calibration could not be performed. If the valve’s stroke drops below
the minimum, or if no valve has been attached to the actuator, the SSA955 will deliver
an error message. If calibration was successful, the SSA955 will automatically switch to
control mode.
For use in rooms, such as sleeping rooms, where extremely quiet operation is required,
the SSA955 can be switched to low-noise operation from the central apartment unit.
Summer operation is triggered from the central apartment unit. When the SSA955
receives a command to start summer operation, the radiator valve will be opened or
closed, depending on the position demanded by the central apartment unit.
The antilime function is triggered by the central apartment unit according to a time
schedule. When the SSA955 receives an antilime command, the radiator valve will be
fully opened and fully closed once. This prevents the valve from seizing. When the
antilime function is completed, the valve will assume the previous control position
again.
The multifunction button can be used to query the battery state and the lead control
function. Both battery state and lead control function are indicated by the multifunction
LED.
The multifunction button can be used to trigger a connection test. This test is made to
check the radio link to the central apartment unit. The RF connection test is indicated
by the multifunction LED.
The multifunction button can be used to reset the SSA955 to the default state as
supplied. Then, the SSA955 must be reintegrated into the system.
If the radio transmission between SSA955 and central apartment unit is interrupted, the
built-in temperature sensor and the comfort setpoint will be used for control.
Parallel operation
Binding
Calibration
Silent mode
Summer operation
Antilime function
State query
RF connection test
Supply state
RF failure
