Automatic change-over cooling/heating (so-called
change-over function)
RCF-230D has an input for change-over which is used
when the thermostat is configured for 2-pipe installations.
It sets output DO4 to operate with heating or cooling
function depending on the fluid temperature (season).
The change-over input can be connected to a
potential-free relay contact or a PT1000-sensor.
The input function for the relay contact can be set to
normally open (NO) or normally closed (NC). If the
change-over input is not used, we recommend that it is
left disconnected and set to NO (factory setting).
When using a sensor, it must be mounted so that it can
measure the temperature on the supply pipe to the coil.
To ensure satisfactory function, the system must also
have continuous primary circuit circulation. Using a
sensor, the output function is set to heating when the
fluid temperature exceeds 28°C and to cooling when the
temperature falls below 16°C.
At heating function “HEAT” is shown in the display and
at cooling function “COOL” is shown.
Occupancy detection for saving energy
By connecting an occupancy detector or a keycard switch
(in hotels) to a digital input, it is possible to change
between Comfort and Economy mode. This way you can
control the temperature according to requirement, which
saves energy and keeps the temperature at a comfortable
level.
Using occupancy detection, it is possible to delay
activation and/or inactivation of Comfort mode, to avoid
switching mode if a person temporarily enters or leaves
the room.
Alternatively, a window contact can be connected to the
input. This sets the thermostat to Off if a window is open
with the purpose of minimising energy consumption.
Operating modes
There are four different operating modes, Comfort,
Economy (Standby), Off and Window. Switch-over
between these modes is performed locally.
Comfort: is shown in the display and the room is in
use. The temperature is held at the comfort level with a
neutral zone (NZC) between activation of heating and
cooling (factory setting for NZC = 2 K (°C)).
Economy (Standby): “Standby” is shown in display.
The room is in energy save mode and is not used at
the moment. This can for example be during nights,
weekends, evenings etc. or during daytime when there is
no one in the room. The thermostat is prepared to change
operating mode to Comfort if someone enters the room.
The heating and cooling setpoints are freely adjustable.
Factory settings: heating=15°C, cooling=30°C.
Off: ”Off” is shown in the display and the backlight is
switched off. The thermostat does not heat or cool and
the fan is inactive, unless mould protection function has
been configured, in which case the fan will continue
to run. There is also a frost protection function for this
operating mode, which will activate the heating output
if the room temperature falls below +8°C. Off mode is
selected by pressing the On/Off button.
Window: is shown in the display. The thermostat is in
Off mode but the display is lit.
Automatic fan speed control
The current fan speed is shown in the display and can
be set manually to Low, Medium or High speed. It can
also be set to Auto, which means that the fan speed is
controlled by the difference between the room’s actual
value and setpoint value.
output
X
The fan speed is set to LowàMediumàHighàAuto by
pressing the fan button.
When there is no heating or cooling demand in the Auto
position, the fan will run at the lowest speed. This can be
changed in parameter 31 so that the fan stops when there
is no heating or cooling demand. The fan is inactive in the
Off and Window modes. However, it will continue to run
if mould protection has been configured.
Mould protection
When this function has been configured, the fan will
always run at the lowest speed and circulate air in the
room to minimise the risk of mould growth in the fan-coil
unit. The function is deactivated on delivery.
Automatic exercise of valves
The thermostat has a function for exercising the valves,
even during periods when they are not being used, to
ensure proper function. Every 23 hours (factory setting),
the output is overridden to close for a moment in order to
open and close the valves. The exercise interval can be set
individually for heating and cooling. The exercise function
can also be inactivated if desired.
Display information and handling
The display has the following indications:
Occupancy
indication
Open window
Indoor /
outdoor
temp.
Setpoint
Changeable value
Current room
temperature or
setpoint in °C to
one decimal point
COOL/HEAT:
Shows if the unit
controls according to
the heating or cooling
setpoint
Off mode
(only the
temperature
is shown)
STANDBY:
Economy mode
indication
SERVICE:
Setting parameters
Fan
Auto/Man
indication
for the fan
Current
fan speed
(Low, Medium, High)
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