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 5
Application Diagrams
Figure 4. Heating Mode (Hot Water Plus
Electric Heat).
Figure 5. Cooling Mode with Optional
Electric Heat
(DIP Switch 4: ON, Electric Heat
Enabled)).
Figure 6. Cooling Mode (Chilled Water)
(DIP Switch 4: OFF, Electric Heat
Disabled).
T[°F] Room temperature
w
Room temperature setpoint
w
D
Setpoint differential
Y
Heating/cooling valve output
voltage
E
Electric heat
SDH Switching differential, Heating
SDC Switching differential, Cooling
Xdz
Dead zone
