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The documents can be downloaded from https://hit.sbt.siemens.com
1)
The PWM control on 2 or more thermal actuators in parallel can be considered
for floor heating/radiator applications. If several fan coil units are controlled by the
same room thermostat, motorized actuators with On/Off or 3-position control are
preferred.
For more information about parallel operation and the max. number of actuators
that can be used, refer to the data sheets of the selected actuator type and the
following list:
Max. number of actuators in parallel on RDG20.. (AC 230 V):
● 6 SS..31.. actuators (3-position)
● 10 SFA.., SUA.., MVI.., MXI.. On/Off actuators
● Parallel operation of SAS31 not available
Max. number of actuators in parallel on RDG20..KN (AC 24 V):
● 6 SS..31.. actuators (3-position)
● 2 SFA71.. On/Off actuators
● Parallel operation of SAS81 not available
Max. number of actuators in parallel on RDG26.. (AC 24 V):
● 10 SS..61.. actuators (DC)
● 10 SFA.., SUA.., MVI.., MXI.. On/Off actuators
● 10 SAS61.. actuators (DC)
● 10 GDB161.9../6W
2.4.1 Recommended RDG actuators and 6-port valves
combinations
Use the following RDG260.. versions (see below) to ensure optimal temperature
control performance of GDB161.9../6W actuators (with 6-port ball valves VWG41..
or 6-port PICV VWPG51..):
● RDG26..KN.. with product index D or higher
● RDG26..T with product index Z, A or higher
Check the device version compatibility in Control output configuration for 6-port
valve (P201) [➙ 105] for applications with older RDG product indices, GDB161.9E
or competitor actuators.
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