2
RC-DFO
Display handling
The display has the following indications:
The buttons on the controller enables easy setting of
parameter values using a parameter menu shown in
the display. The parameter values are changed with
the INCREASE and DECREASE buttons and changes
confirmed with the occupancy button.
Control modes
RC-DFO can be configured for different control modes/
control sequences:
• Heating
• Heating or Cooling via change-over function
• Heating/Heating
• Heating/Cooling
• Heating/Cooling with VAV-control and forced
supply air function
• Heating/Cooling with VAV-control
• Cooling
• Cooling/Cooling
Operating modes
There are five different operating modes: Off, Unoccupied,
Stand-by, Occupied and Bypass. Occupied is the preset
operating mode. It can be set to Stand-by using the
parameter menu in the display. The operating modes can
be activated via an occupancy detector or the occupancy
button.
Off: Heating and cooling are disconnected. However, frost
protection is still active (factory setting (FS) = 8°C). This
mode is activated if a window is opened.
Unoccupied: The room in which the controller is placed
is not used for a extended time period, such as during
holidays or long weekends. Both heating and cooling are
kept within a temperature interval with configurable
min/max temperatures (FS min = 15°C, max = 30°C).
Stand-by: The room is in an energy saving mode and is
not used at the moment. This can, for instance, be during
nights, weekends and evenings. The controller stands
by to change operating mode to Occupied if presence
is detected. Both heating and cooling are disconnected
within a temperature interval surrounding the current
setpoint (FS heating setpoint = -3°C, cooling setpoint =
+3°C).
Occupied: The room is in use and a comfort mode is
activated. The controller maintains the temperature
around a heating setpoint (FS = 22°C) and a cooling
setpoint (FS = 24°C).
Bypass: The temperature in the room is controlled in the
same way as in the Occupied operating mode. The output
for forced ventilation is also active. This operating mode
is useful for instance in conference rooms, where many
people are present at the same time for a certain period
of time.
When Bypass has been activated by pressing the
occupancy button, the controller will automatically
return to its preset operating mode (Occupied or
Stand-by) after a configurable time has elapsed (FS = 2
hours). If an occupancy detector is used, the controller
will automatically return to its preset operating mode if
no occupancy is detected for 10 minutes.
Occupancy detector
By connecting an occupancy detector, RC-DFO can
switch between the Bypass operating mode and its preset
operating mode (Occupied or Stand-by). This way, the
temperature is controlled from requirement, making it
possible to save energy while maintaining the temperature
at a comfortable level.
The occupancy button
Pressing the occupancy button for less than 5 seconds
when the controller is in its preset operating mode will
cause it to change to operating mode Bypass. A short
press of the button when the controller is in Bypass mode
will cause it to revert to the preset operating mode.
If the occupancy button is pressed for more than 5
seconds will change the controller’s operating mode to
”Shutdown” (Off/Unoccupied) regardless of its current
operating mode. The display enables selecting which
operating mode, Off or Unoccupied, should be activated
on ”Shutdown” (FS = Unoccupied). A short press when in
Shutdown mode will return the controller to Bypass.
Forced ventilation
Regio has a built-in function for forced ventilation. A
closing of the digital occupancy detector input will set
the controller to Bypass mode and activate the output
for forced ventilation (DO1). This can for instance be
used to open a damper. This function is terminated when
the settable forcing interval (10 min.) has run out. The
function can also be activated at the press of a button.
Forced ventilation
Changeable value
Fan
Auto/Man.
indication
for the fan
Current
fan speed
(0, 1, 2, 3)
Occupancy
indication
Open window
Indoor /
outdoor
temp.
Setpoint
Current room
temperature in
°C to one
decimal point
COOL/HEAT: Shows if
the unit controls
according to the heating
or cooling setpoint
OFF:
Unoccupied
(also shows
temperature)
or O
indication
(only OFF)
STANDBY:
Standby indication
SERVICE:
Setting parameters
INCREASE
DECREASE
FAN BUTTON
Occupancy button
