NRT405F901 manual
Chapter 6
Installation
16
Wiring of various actuators
When wiring thermal actuators, DO4 is used for heating and DO5 for cooling actuators. If
the change-over function is used together with a 2-pipe installation, the actuator should be
connected to DO4 if an electric heater is not used. If an electric heater is used, the change-
over function is instead located on DO5. When wiring 3-position actuators, DO4 is used for
the increase signal and DO5 for the decrease signal, including when the change-over
function is used.
Terminal
Designation
Description
Function
10
L
230 V AC Line
Supply voltage
11
NC
Not connected
12
N
230 V AC Neutral
Power supply (internally connected
to terminal 13)
13
N
Fan-coil common / 230 V
AC Neutral
Common fan-coil connector
(internally connected to terminal
12)
20
DO1
Fan-coil output 1 for fan
control
Relay, 230 V AC, 3 A
21
DO2
Fan-coil output 2 for fan
control
Relay, 230 V AC, 3 A
22
DO3
Fan-coil output 3 for fan
control
Relay, 230 V AC, 3 A
30
NC
Not connected
31
DO4
Digital output 4 for
heating/cooling or opening
with 3-point actuator
Digital output, 230 V AC, max 300
mA. Max 2 A during 20 ms.
32
CDO45
Common DO4 & 5
Common connection for digital
outputs 4 and 5
33
DO5
Digital output 5 for
cooling or closing with 3-
point actuator
Heating/cooling signal
when electric heater is
configured.
Digital output, 230 V AC, max 300
mA. Max 2 A during 20 ms.
40
DI
Digital input
Floating (potential-free) window
contact or occupancy contact.
Configurable for NO/NC.
41
AGnd
Analogue ground
42
AI
Analogue input
External PT1000 instead of the
internal NTC
43
UI
Universal input
Change-over input. Floating
(potential-free) switch
(configurable for NO/NC) or
PT1000.
44
AGnd
Analogue ground
50
AGnd
Analogue ground
51
NC
Not connected
52
NC
Not connected
53
A
RS485 communication A
NRT405F901
54
B
RS485 communication B
NRT405F901