Technical Instructions
RCU50U and RCU50.2U Room Temperature Controllers
Document Number 155-327P25
for CAV Systems
Rev. 1, March, 2002
Page 6
Siemens Building Technologies, Inc.
Notes, Continued
•
Check the settings of DIP Switches No. 1 through No. 5 and of the potentiometer of
the RCU50U, and of DIP Switch No. 1 of the RCU50.2U and change them, if
required
•
After applying power, the controller makes a reset, which takes about three
seconds; it is then ready to operate.
•
The unit can be located on a wall of the room to be conditioned. Do not mount in
direct sunlight or near other heat or refrigeration sources.
•
Mounting height is approximately 60 inches (150 cm) above the floor. (See
Figure 8.)
•
The connecting wires can be run to the controller from a recessed conduit box.
•
The controller should be opened by authorized personnel only.
Figure 8. Acceptable Mounting Height.
•
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 positions upon start-
up.
•
User input via set point knob or operating mode/fan speed selector (RCU50.2U
only) 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 center of the controller.
2. Lift the bottom of the controller from the controller base and push up to remove
cover from two tabs located at the top of the controller base.
3. Separate the controller base from the controller.
Figure 9. Thermostat Cover Separation.
