RDF20U Room Temperature Controller with LCD Technical Instructions
For Two-Pipe Fan Coil Units with Electric Heat Document Number 155-334
September 27, 2007
Siemens Industry, Inc. Page 11
Specifications,
Continued
Environmental Conditions
Operation
Temperature 32°F to 122°F (0°C to 50°C)
Humidity <95% rh
Transport and storage
Temperature -13°F to 158°F (-25°C to 70°C)
Humidity <95% rh
Connection terminals Solid wires or prepared stranded
wires 2 × 16 AWG or 1 × 14 AWG
Weight 0.55 lb (0.25 kg)
Housing front color White (RAL 9003)
Figure 9. Wiring Terminals.
1, 2 24 Vac, negative
3 24 Vac, positive
9 Return air temperature
sensor
8 Measuring neutral
7 Changeover sensor
D1,GND Potential-free operating mode
changeover switch (operating action
can be selected)
12 Control output, Fan speed I, 24 Vac
11 Control output, Fan speed II, 24 Vac
10 Control output, Fan speed III, 24 Vac
4 Control output, Valve 24 Vac
5 Control output, Valve 24 Vac
6 Control output, Electric heat 24 Vac
Figure 10. Two-Pipe Fan Coil Units with
Electric Heat.
B1 Return air temperature sensor
(QAH11.1)
B2 Changeover sensor (temperature
sensor QAH11.1)
E1 Electric heat
M1 3-speed fan
N1 Room temperature controller
RDF20U
S1 External operating mode
changeover switch
SN 24 Vac, negative
SP 24 Vac, positive
Y1 Zone valve
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