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modes is performed locally.
Stand-by: Both heating and cooling are disconnected within a tem-
perature interval around the applicable setpoint (FS = heating setpoint
value - 3°C, cooling setpoint + 3°C).
Occupied: The room temperature is controlled according to the ap-
plicable cooling setpoint (FS = 24°C) or heating setpoint (FS = 22°C).
Bypass: Is controlled by the occupancy detector or other digital
contact connected to the controller, closing activates Bypass. Control
of the room temperature in the same way as Occupied mode. Bypass
also controls forced ventilation. Reset to Preset operating mode
occurs after a certain time (FS = 10 minutes) of non-occupancy (no
signal from presence detector).
Unoccupied: Both heating and cooling are disconnected within a
temperature interval with configurable min/max limits (FS = min 15°C,
max 30°C). This mode is activated when the Occupancy button is
held depressed for more than 5 seconds.
Off: Heating and cooling are disconnected. However, the temperature
must not drop below the set minimum temperature (FS=8°C). The
mode is activated on open window (or when the Occupancy button is
held depressed for more than 5 seconds, if this has been configured
in the parameter menu).
Preset operating mode
Occupied is the preset operating mode. This can be set to Stand-by in
the parameter menu, parameter 45.
Occupancy detector
An occupancy detector is connected for local control of the operating
mode between Preset operating mode and Bypass.
Setpoint
In Occupied mode, the controller operates from a heating setpoint
(FS = 22°C), or a cooling setpoint (FS = 24°C) that can be changed
using the INCREASE and DECREASE buttons.
Pressing on INCREASE increases the current setpoint in steps of
0.5°C up to the max. limit (+3°C). Pressing on DECREASE decreases
the current setpoint in steps of 0.5°C down to the min. limit (-3°C).
Switching between heating and cooling setpoints is done automatical-
ly in the controller depending on the heating and cooling requirement.
Choice of setpoint display, see parameter 74.
Fan control
RC-DFO has a fan switch with the following positions:
AUTO
Automatic control of the fan speed to maintain
desired room temperature.
0
Fan off.
I
Manual position with low speed.
II
Manual position with medium speed.
III
Manual position with high speed.
Frost protection
Independent of the operating mode, the heating control is forced on when
the room temperature drops below 8°C (FS). Return to normal control oc-
curs automatically when the room temperature exceeds 8°C.
Condensation detector
If there is condensation, the cooling control is blocked. Return to normal
control occurs automatically when condensation ceases.
Display handling
Indications
The display has the following indications:
Current fan
speed
Auto/Man
(0, 1, 2, 3)
Forced ventilation
indication
for the fan
Fan
Setpoint
Indoor /
outdoor temp.
OFF:
Unoccupied
(also shows
temperature)
STANDBY: Standby
COOL/HEAT: Shows if the unit
or Off
indication
controls according to the heating
indication
or cooling setpoint
(only OFF)
SERVICE: Setting
parameters
Buttons
RC-DFO has the following buttons:
•
Occupancy button
When the Occupancy button is held depressed for more than 5 sec-
onds, the controller changes operating mode to "Shutdown" (Off/Un-
occupied), regardless of the current operating mode. Via the display,
you can configure which operating mode, Off or Unoccupied, should
be activated on "Shutdown". The factory setting is that Unoccupied is
activated.
If you press the Occupancy button for less than 5 seconds when the
controller is in operating mode Shutdown or the preset operating
mode, the controller changes to operating mode Bypass. If you press
the button for less than 5 seconds when the controller is in Bypass,
it changes operating mode to the Preset operating mode. After a
RC-DFO
configurable time in Bypass (FS = 2 hours), the controller returns
to the preset operating mode.
•
INCREASE button
•
DECREASE button
Setting parameters
Change parameters
It is possible to set different parameter values in a parameter menu.
The parameter menu is accessed by simultaneously holding the IN-
CREASE and DECREASE buttons depressed for about 5 seconds and
then pressing the INCREASE button twice. The Service indication will
be displayed.
First the display will show the parameter-number 1. Scroll between
parameters by using the INCREASE and DECREASE buttons.
Press the Occupancy button to select the desired parameter. The pa-
rameter number will be replaced by the parameter value. The value can
be changed using the INCREASE and DECREASE buttons. If a button
Changeable value
is held depressed the value will start scrolling, first slowly and then with
Occupancy
increasing speed in 3-4 steps with 2-3 seconds between steps.
indication
Acknowledge/Regret change
To acknowledge and store a set parameter value, press the Occu-
Current room tem-
pancy button again, the display then returns to showing the parameter
perature in °C to
number. To retrieve the original value, i.e. the value before change,
one decimal point
press the INCREASE and DECREASE buttons at the same time. The
Open window
original value is shown on the display.
Return to normal display
After a certain time, about 1 minute, or when the INCREASE and DE-
CREASE buttons are pressed at the same time while in the menu, the
display returns to the normal view.
Exit is shown on the display after the last parameter. The param-
eter menu is exited by pressing the Occupancy button while in Exit.
Pressing on INCREASE goes to the first parameter and pressing on
DECREASE goes to the last parameter.
Parameter number
The following parameters can be changed in the parameter menu:
Para-
Description
meter
number
1
Basic setpoint heating
2
Basic setpoint cooling
3
Neutral zone at Stand-by.
Heat sp. = Basic sp. heat - 3.
Cool sp. = Basic sp. cool + 3.
4
Heat setpoint at Unoccupied
5
Cooling setpoint at Unoccupied
6
Frost protection setpoint
FS
22°C
24°C
3°C
15°C
30°C
8°C
3
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