Technical Instructions
RCU61U Room Temperature Controller
Document Number 155-328P25
for CAV Systems
October 6, 2016
Page 6
Siemens Industry, Inc.
Mounting,
Installation and
Commissioning
When mounting the unit, attach the controller base first. Then, make the electrical
connections and fit and secure the cover.
The controller must be mounted on a flat wall and in compliance with local regulations.
Any radiator valves in the room must be set to their fully open position upon start-up.
Outputs 9 (Opening), 10 (Closing), and 8 (Neutral) are used to drive three-position
actuators with a maximum running time of 150 seconds from the fully closed to the fully
open position.
When commissioning the controller, an opening signal of 200 seconds is delivered,
followed by a closing signal of 200 seconds to ensure the actuator will be fully closed.
When the actuator has reached the position calculated by the controller, a waiting time
of 30 seconds is observed to stabilize the outputs. The 0 to 10 Vdc cooling output is not
available until 400 seconds after controller power-up.
User input using setpoint knob results in instantaneous response. There is a one-
minute delay before changes made to temperature sensing and changeover are
implemented.
Drywall Mounting
1. Insert a small screwdriver into the bottom of the controller and press in the tab
located in the center of the controller.
2. Lift the bottom of the controller from the controller base and push up to remove the
cover from the two tabs located at the top of the controller base.
3. Remove the base from the back of the controller.
Figure 7. Controller Cover Separation.
4. Using the controller base as a template, mark the hole locations with a pencil.
5. Drill two 1/4-inch diameter holes for the plastic wall anchors.
6. Using a mallet, tap in the plastic wall anchors flush with the wall.
7. Pull the wiring through the opening in the upper portion of the controller base.
8. Level the mounting plate.
9. Using the two wood screws provided, fasten the controller base to the wall. The
controller is not position sensitive.
10. Pull the wiring through the controller base.
11. Position the controller housing over the two mounting lugs located at the top of the
controller base, and press down on the cover until the bottom lugs snap in place.
