Technical Instructions
RCU61U Room Temperature Controller
Document Number 155-328P25
for CAV Systems
October 6, 2016
Page 10
Siemens Industry, Inc.
Maintenance
The room temperature controller is maintenance-free. If inoperable, replace the entire
unit.
Specifications
Power Supply
Operating voltage
24 Vac ±10%
Control action
(P) Proportional
Frequency
50/60 Hz
Functional Data
Setpoint setting range
50°F to 85°F (10°C to 30°C)
Maximum control deviation at 68°F (20°C)
±0.7K
Switching differential heating SDH or
2°F or 7°F (1°C or 4°C)
P-band XpH (selectable)
Switching differential cooling SDC or
1°F or 3.5°F (0.5°C or 2°C)
P-band XpC (selectable)
Temperature setpoint shift
±22.5°F at 72°F setpoint
Control output, Terminal 4
Voltage
0 to 10 Vdc
Current
±1 mA
Control output, Terminals 9 and 10
Three-position output
Voltage
24 Vac ±20%
Current
2A maximum
Motor timing for heating output
150 seconds at 50/60 Hz
Status input D1
Contact sensing
6 to 15 Vdc/3 to 6 mA
Insulation against mains voltage
4 kV
Maximum number of contacts connected
50
in parallel
Status input, terminal 1
Setpoint shift of 22.5°F (12.5°C)
0 to 10 Vdc
Neutral position (no setpoint shift)
5 Vdc
Maximum copper cable length 16 AWG
For Input Signal Terminal 1
262 feet (80 m)
For Input Signal D1
262 feet (80 m)
Environmental
Conditions
Operation
Temperature
32°F to 122°F (0°C to 50°C)
Humidity
<95% rh
Agency Approvals
UL listing
UL 873
Conforms to CE requirements
cUL certified to Canadian Standard
C22.2 No. 24-93
General
Connection terminals
2 × 16 AWG or 1 × 14 AWG
Maximum 20 AWG
Use solid wires or prepared stranded wires.
Weight
0.5 lb (0.23 kg)
Housing color
Cover
White
Base
Gray
