Specifications - Siemens RDU50U Technical Instructions

RDU20U, RDU50U and RDU50.2U Room Temperature Controllers
with LCD for Heating and Cooling Systems

Specifications

Power Supply
Operational data
Environmental
Conditions
Agency Approvals
General
Siemens Industry, Inc.
Operating voltage
Frequency
Power consumption
Control output 1–5 (RDU50U and RDU50.2U)
Resolution
Effective current
Control output 4–6 (RDU20U)
Return air temperature input 4–3
Changeover temperature input 2–3
(RDU50U) and RDU20U
8–7 (RDU20U)
Dry contact D1 and GND
Contact sensing
Operating action
Maximum cable length 16 AWG
for connection to terminals 4, 2 and D1
Setpoint setting range
Control deviation at 77°F (25°C)
P-band in heating mode, adjustable
in 0.5K increments (1 Kelvin = 2°F)
Factory setting
P-band in cooling mode, adjustable
in 0.5K increments (1 Kelvin = 2°F)
Factory setting
Integral action time, adjustable
Factory setting
Setpoint (Energy Saving Mode
Setpoint (Energy Saving Mode
Operation
Temperature
Humidity
Shipping and storage
Temperature (RDU50U and RDU50.2U)
(RDU20U)
Humidity
Connection terminals
Weight
Housing color
Cover
Base
24 Vac +20%
50/60 Hz
Maximum 4 VA
0 to 10 Vdc
39 mV
Maximum +1 mA
24 Vac
QAH11.1 safety class 2
NTC resistor 3K ohm at 77°F (25°C)
6 to 15 Vdc/3 to 6 mA
Normally Open (NO)
262 feet (80 m)
41°F to 95°F (5°C to 35°C)
Maximum +1.6°F (0.9°C)
0.5K to 4K
2K
0.5K to 4K
1K
1 to 10 minutes
5 minutes
), heating 41°F to 65°F (5°C to 18°C)
), cooling 75°F to 95°F (24°C to 35°C)
32°F to 122°F (0°C to 50°C)
<95% rh
-13°F to 158°F (-25°C to 70°C)
-13°F to 140°F (-25°C to 60°C)
<95% rh
Conforms to CE requirements
NEMA 1
Use solid wires or prepared stranded
wires. 2 × 16 AWG or 1 × 14 AWG
Maximum 20 AWG
0.5 lb (0.23 kg)
White
Gray
Technical Instructions
Document Number 155-735
November 1, 2006
Page 9