sauter NRT405F901 Instructions page 2

between Comfort/Economy and Off can also be done via the On/Off
button. Comfort/Economy is selected via the parameter list.
Economy (Standby): "Standby" is shown in the display. The heat-
ing and cooling setpoints are freely adjustable. Factory settings:
heating=15°C, cooling=30°C.
Off: The controller does not heat or cool and the fan stops (unless
mould protection has been selected or the cool-down function for the
electric heater is running, in which case the fan will still run).
Window: is shown in the display, the controller is off and the fan
stops (unless mould protection has been selected or the cool-down
function for the electric heater is running, in which case the fan will
still run). The window contact is connected to the DI and must be
configured.
Occupancy detection
Parameter 3 determines if the DI is window contact input or
occupancy detection input. An occupancy detector can be connected
to the DI in order to switch between Comfort and Economy mode.
Setpoint
The setpoint is set using the INCREASE and DECREASE buttons.
Parameter 24 determines what is shown in the display. Refer to the
parameter list for details.
Setpoint limitation
In parameters 34 and 35, it is possible to set the maximum allowed
setpoint increase and decrease respectively.
Example: If P35=5 and P34=3, the setpoint can be changed between
17°C and 25°C (see the picture below).
The basic setpoint can be changed in parameter 64 (factory
setting=22°C).
Figure 3: Example of setpoint limitation
Fan control
The fan can be controlled via NRT405F901 with the following modes:
Low speed, Medium speed, High speed, Auto. The current fan speed
in the Auto mode depends on the heating or cooling demand and the
settings for each speed.
When using automatic control, "AUTO" is shown in the display.
The number of fan speed steps can be selected via parameter 30. If the
parameter is set to 1, the first fan speed step will be used for fan control.
Via parameter 31, it is possible to set the fan to the lowest speed level
when Auto mode is selected. If this parameter is set to 1, the fan will run
in all operating modes except Off and Window (unless mould protection is
active or the cool-down function for the electric heater is running, in which
case the fan will run in these modes as well).
When utilising an electric heater, parameter 1 set to 4, the fan has a cool-
down period of 2 minutes.
Manual control of the fan speed
By pressing the fan button, you change the fan speed according to the
sequence IàIIàIIIàAUTO. When using manual control, "MAN" is shown
in the display.
If the fan has been configured not to be affected by the heating or cooling
demand, "AUTO" will not be shown when pressing the fan button.
Indications
The display has the following indications:
HEAT Heating control
COOL Cooling control
The open window symbol is shown if this function has
been configured and a window is open.
OFF The controller does not heat or cool
On/Off button
By pressing the On/Off button, NRT405F901 will switch between Off
mode and Comfort/Economy mode.
Function for control of an electric heater
NRT405F901 has a function for pulse/pause control of an electric heater
in sequence with a water heater, similar to control of a thermal actuator.
When using an electric heater, the fan will continute to run for 2 minutes
after the heater has been switched off in order to cool down the heater.
When using an electric heater, an external unit (e.g. a solid state relay) is
to be connected between NRT405F901 and the battery.
Note: NRT405F901 does not indicate fan breakdown or overheating of
the heating coil. Therefore, all connections must be made externally. An
overheating protection or similar can be used to disconnect the supply
voltage.
Parameter list
When the controller is in Comfort mode or Window mode, different param-
eter values can be set in a parameter list.
Hold the INCREASE and DECREASE buttons depressed simultaneously
for about 5 seconds until the Service symbol is displayed and then press
the INCREASE button twice.
NRT405F901
First the display will show parameter 1. Use the INCREASE and
DECREASE buttons to scroll between the parameters and press the
On/Off button to select the desired parameter. The parameter number
will then be replaced by the parameter value. The value can be
changed using the INCREASE and DECREASE buttons. If a button is
held depressed the value will start scrolling, first slowly and then with
increasing speed.
To exit the parameter list and go back to the basic display, press the
INCREASE button until "EXIT" is shown (one step before parameter
1) and press the On/Off button. You can also exit the parameter list by
pressing down the INCREASE and DECREASE buttons simultane-
ously.
Parameters
The following parameters can be changed in the parameter list.
Nº = parameter number
FS = factory setting
NO = normally open
NC = normally closed
Nº Description
1 Control mode:
2=2-pipe system
3=4-pipe system
4=Electric heater
2 Change-over mode:
0=Heating control, 1=Cooling control, 2=Automatic
change-over depending on analogue temperature
sensor or digital input
3 Operating mode when activating digital input 1:
0=Economy mode (occupancy detector)
1=Off mode (window contact)
4 Mould protection:
0=Not active
1=Active (fan never stops)
5 Neutral zone at Comfort mode (NZC). If the neu-
tral zone is 2 K, the heating setpoint is equal to the
setpoint minus 1 and the cooling setpoint is equal
to the setpoint plus 1.
6 Heating setpoint when unoccupied
7 Cooling setpoint when unoccupied
8 P-band for the room controller
9 I-time for the room controller
10 Not used for this model
11 Switch off timer for Comfort mode
FS
3
2
0
0
2 K
15°C
30°C
10 K
300 s
0 min
2