RCU61U Room Temperature Controller
Technical Instructions
For CAV Systems
Document Number 155-328P25
October 6, 2016
Siemens Industry, Inc.
Page 3
Minimum Limitation of
Cooling Signal,
Continued
Figure 2. Potentiometer Location.
Setpoint Shifting
Signal Inputs (Terminals 1 and 2) are used for outside temperature compensation.
Using a 0 to 10 Vdc signal, the setpoint can be shifted by ±22.5°F at 72°F. The neutral
position is at 5 Vdc and means no setpoint shift.
W
Original setpoint
W1 New setpoint at 10V input
W2 New setpoint at 0V input
(V) Input voltage
Figure 3. Setpoint Shifting.
Setpoint Limit Stops
The room temperature setpoint can be limited in increments of 2°F (1°C) by using the
minimum and maximum setpoint limit stops. This prevents arbitrary setpoint
readjustments.
To set limit stops, remove the setpoint knob by pulling it straight off the shaft.
Reposition gray tabs for high and low stops in the holes around the perimeter of knob
as required. See Figure 4.
Figure 4. Setpoint Limit Stops.
