RDX42.22U Room Temperature Controller with LCD
Technical Instructions
Document Number 155-747
March 13, 2008
Siemens Industry, Inc.
Page 9
Specifications
Power Supply
Operating voltage
24 Vac + 20%
Frequency
50/60 Hz
Power consumption
Maximum 6 VA
Control output FAN
24 Vac
Rating
Maximum 5(3)A
Control outputs COOLING and HEATING
24 Vac
Rating
Maximum 5(3)A
Control output AUX. HEATING
24 Vac
Rating
Maximum 5(3)A
Remote temperature sensor status input 8-7
QAH11.1 safety class II
NTC resistor 3 k ohm at 77°F (25°C)
Status input D1 and GND
Operating action selectable
Normal open (NO)
Contact sensing
Normal closed (NC)
Insulation against line voltage
SELV 6 to 15 Vdc/3 to 6 mA, 4kV
reinforced insulation
Permissible cable length with copper cable
262 ft (80 m)
2 × 16 AWG or 1 × 14 AWG for connection to
terminals 8 and D1
Operational data
Setpoint setting range
46°F to 95°F (8°C to 35°C)
Control deviation at 77°F (25°C)
M 1°F (0.5 K)
Setting Range
Factory Setting
Switching differential in heating mode (adj)
1°F to 7°F
3.5°F (2 K)
Switching differential in cooling mode (adj)
1°F to 7°F
2°F (1 K)
Setpoint differential W
D
(adjustable)
1°F to 9°F
3.5°F (2 K)
Setpoint (Energy Saving Mode ), heating
46°F to 64°F
61°(16°C)
Setpoint (Energy Saving Mode ), cooling
75°F to 95°F
82.5°F (28°C)
Environmental
Conditions
Operation
Temperature
32°F to 122°F (0°C to 50°C)
Humidity
<95% rh
Shipping and storage
Temperature
–13°F to 158°F (–25°C to 70°C)
Humidity
<95% rh
Agency Approvals
Conforms to CE requirements
NEMA 1
General
Connection terminals
Use solid wires or prepared stranded
wires. 22 AWG to 14 AWG
Weight
0.5 lb (0.225 kg)
Housing cover color
White
