Wiring Terminals; Wiring Diagrams - Siemens RDF20U Technical Instructions

RDF20U Room Temperature Controller with LCD
For Two-Pipe Fan Coil Units with Electric Heat
Specifications,
Continued
Environmental Conditions
Agency Approvals
General

Wiring Terminals

Wiring Diagrams

Siemens Industry, Inc.
Operation
Temperature
Humidity
Transport and storage
Temperature
Humidity
UL Listing
Connection terminals
Weight
Housing front color
Figure 9. Wiring Terminals.
Figure 10. Two-Pipe Fan Coil Units with
Electric Heat.
Document Number 155-334
32°F to 122°F (0°C to 50°C)
<95% rh
-13°F to 158°F (-25°C to 70°C)
<95% rh
UL 873
Solid wires or prepared stranded
wires 2 × 16 AWG or 1 × 14 AWG
0.55 lb (0.25 kg)
White (RAL 9003)
1, 2 24 Vac, negative
3 24 Vac, positive
9 Return air temperature
sensor
8 Measuring neutral
7 Changeover sensor
Potential-free operating mode
D1,GND
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
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
Technical Instructions
September 27, 2007
Page 11