RCC10U Room Temperature Controller
Technical Instructions
for Two-pipe Fan Coil Units
Document Number 155-712
September 27, 2007
Siemens Industry, Inc.
Page 5
Energy Saving Mode
In Energy Saving mode, the heating setpoint is 61°F (16°C) and the cooling setpoint is
82°F (28°C), independent of the position of the setpoint knob. This operating mode will
be activated when input D1 for operating mode changeover is active and DIP Switch
No. 2 is set to ON.
When the DIP switch is in Energy Saving mode and the fan speed control is set to
Standby, the Energy Saving mode takes precedence over Standby mode. When the
room temperature drops below the Energy Saving setpoint, the fan operates at low
speed until the energy load is satisfied; then the fan turns off. Low fan speed will be
selected even though the fan switch is on Standby.
Operating Mode
Changeover Switch
A changeover switch can be connected to status input D1
–GND. When the switch
closes its contact (such as, caused by an open window), the operating mode will
change from Normal operation to Energy Saving mode (if DIP Switch No. 2 is set to
ON), or from Normal operation to Standby (if DIP Switch No. 2 is set to OFF). If the
room temperature falls below 46°F (8°C) and if DIP Switch No. 4 is set to OFF, Freeze
Protection mode will become active.
The operating action of the switch (NC or NO) can be selected by DIP Switch 3.
Mechanical Design
The unit consists of two parts:
•
A plastic housing which accommodates the electronics, the operating elements and
the built-in room temperature sensor.
•
A controller base.
The housing snaps into the top of the mounting base and is secured with a screw at the
bottom.
The wire terminal block is mounted on the base; the DIP switches are located at the
rear of the housing.
To access the DIP switches, remove controller from controller base. See Figure 3.
Figure 3. DIP Switch Setting.
