systematic and may not occur. Conversely, in case problems should
arise and none of the points mentioned in this paragraph has solved
them, it is recommended to connect a repeater (CONV RS485-RIP),
as shown in the picture below:
N4177-07
Repeater
G
N
D
+ -
+ -
G
N
D
R=100 - 120 Ohm
Device
Device
G
N
D
+ -
+ -
+ -
G
N
D
G
N
D
Device
G
N
D
+ -
Device
+
-
Supervisory
System
GND
R=100 - 120 Ohm
N.B.: Connect the repeater if cables length exceeds 1200m or if de-
vices are more than 32.
Operation modes
NR9001 works with 3 different operation modes:
•
COMFORT
: the controller will control the temperature (driving
valves and fan) to satisfy the Comfort Temperature Set.
•
ECONOMY: the controller will control the temperature to satisfy
the Economy Temperature Set.
•
FROST PROTECTION: the controller is normally OFF; just during
winter operation it works with a set fixed at 8°C and heating
function only.
CONTROLLER FUNCTIONS
Summer/Winter Changeover
The summer/winter changeover is used by the controller to reverse
the action (Hot/Cold) in 2-pipe systems: the temperature set in econ-
omy mode will be increased with the set correction during summer
and decreased during winter. S/W changeover can be carried out
in 3 different ways, it means through: digital input DI3, S4 sensor input
on collector, ModBus connection (EEprom value). In case of use of
S4 sensor 2 set are need to switch from summer to winter.
N.B: by default Summer/Winter changeover is set by local mode; in
plants equipped with a supervisory system it has to be preconfigured
by remote mode;
Initial Valve position
To drive a 3-point actuator is necessary to place the actuator in a
specific position. Each time the controller is powered up, the actua
-
tor will be driven in the closing position for a time equal to the overall
travel time plus 33%.
Cut-off
This function is used to stop the control of the 3 points actuator after
the overall travel time plus 33%. This function is used to ensure the
correct valve closing and to reduce the noise.
The function can be disabled by the supervisory system. In this case
at its stroke end the actuator will be powered indefinitely.
Window contact
This function is used to save energy when a Normally Closed contact
is opened (Open Window). In this case the controller will change
the operation mode from Comfort to Economy. When the window is
open, if the minimum fan speed or the air recirculation functions are
enabled, the fan will be anyway turned off when the set is reached.
Hot/Cold launch
This function is used to avoid the introduction of cold or hot air in
the ambient by delaying (for a set time) the fan start. To disable the
function, set the time = 0.
“Disposal”
The “Disposal” function is useful both for the hot and the cold chan-
nel and it helps to take off the energy stored in the fan coil radiator
by delaying the fan turning off.
To disable the function, set the time = 0.
Minimum speed activation
This function is used to prevent air stratification, especially when using
the Return Sensor, as it could be very low sensitive to temperature
variation that occurs at man’s height. A continuous air movement
helps to avoid /reduce air stratification and to optimize the regula
-
tion.
If the fan is connected to the relay output, it is necessary to set the
“minimum fan speed” parameter at 1. A system configuration with
Proportional Fan requires setting the minimum speed in % of the con
-
trol value (0 - 10V), therefore, if the fan is connected to the 0-10V
output, it is necessary to set the “minimum fan speed” parameter
at a value between 0 and 50. In both cases the 0 value disables the
function. To disable this function, set 0 as minimum speed.
Auxiliary regulation ON/OFF (P action)
This function is enabled by default as an alternative to “changeover
Auto” function, when the sensor in position S3 is connected. If the
remote set in S4 is connected, it is possible to have a set in the range
10-30°C, otherwise it can be set through the supervisory system to
-
gether with the dead zone.
If the supervisory system is not present , this function will be carried on
at fixed point 20°C with dead zone = 1K. The output will be available
in OC2 and it will exclude the management of the electrical coil.
Air recirculation function
This function manages the minimum fan speed. It is enabled setting a
“period” and a “minimum speed” different from zero. When the “pe-
riod” will be passed, the fan will be enabled at the minimum speed
for the time (minutes) set.
Batteria elettrica
La batteria elettrica può essere attivata in “soccorso” tramite il tool
di configurazione.
L’uscita fornisce un segnale open collector (OC2) (con segnale di
riferimento pin 30, +12V) per comandare un relè ausiliario esterno.
L’uscita viene attivata quando la temperatura ambiente è inferiore
a:
set operativo “caldo” – banda proporzionale – 1°C
e disattivata quando la temperatura ambiente è superiore a:
set operativo “caldo” – banda proporzionale
Automatic changeover
This function can be enabled through the configuration tool by set
-
ting label “ChOver-LimF” instead of “Loop AUX”. This function is auto
-
matically activated connecting S4 sensor.
If the temperature measured by S4 sensor is lower than the minimum
set, (default 20°C) than the controller switches to summer operation
mode. If the temperature measured is higher than the maximum set,
(default 30°C) than the controller switches to winter operation mode.
Fan minimum limit
The function can be enabled through the Configuration Tools by set
-
ting “ChOver-LimF” instead of “Loop AUX”.
This function inhibits ventilation in heating mode if the temperature
detected by the sensor is lower than the set minimum limit set by the
configuration tool (default 35 °C).
The function is automatically activated by connecting sensor S3 or
S4.
If only the S4 sensor is used (positioned on the water inlet manifold)
the function of changeover and minimum limit will be active at the
same time.
In the event of special requirements, the minimum ventilation fun
-
ction can also use the S3 sensor.
The function cannot be excluded but can be made inactive by set
-
ting the Set value to the minimum value (10 °C).
Check of minimum limit and maximum fan speed
This feature allows you to limit the speed of the fan with a different
meaning for the 3-speed fan and proportional.
Through the configurator you can set the values of the limits and, for
the proportional, decide whether to keep the minimum speed also
when the set is satisfied.
The first type of ventilation runs directly through the motor windings
1
st
Issue
06/2019
DBL585e
Page 9
