User Manual

5/14
Siemens Non-communicating room controllers CA2N3881en_02
Building Technologies RXA20.1, RXA21.1, RXA22.1 2012-08-28
The simultaneous load on outputs Y1 … Y4 must not exceed 9.5 VA.
Example: Y1 (heating) 2 thermic valve actuators, type STP72E 6 W
Y2 (cooling) 2 thermic valve actuators, type STP72E 6 W
Y3, Y4 (outside air) Damper actuator 3.5 VA 3.5 VA
The maximum load is 9.5 VA for the heating sequence and 9.5 VA for the
cooling sequence. This is acceptable because the two sequences never
operate at the same time.
Mounting instructions
The room controllers can be mounted in any orientation using the following fixing
options:
00609
00610
Rail mounting
The housing base is designed for snap-
mounting on DIN rails, type EN50022-
35x7.5 (can be released with a screw-
driver)
Surface mounting
There are two drill holes for screw-mounting (see “Dimensions” for
drilling template). The housing base is fitted with raised supports.
Screws: Max. diameter 3.5 mm, min. length 38 m
STOP
Note!
Tightening torque for fixing screws max. 1.5 Nm
When mounting note the following:
 The controller should not be freely accessible after mounting
 Ensure adequate air circulation to dissipate heat generated during operation.
 Easy access is required for service personnel
 Local installation regulations must be observed.
Mounting instructions and a drilling template are printed on the controller packaging.
AC 24 V triac outputs