6
Terminal block connections
Description
Connector/
channel
Terminal Board (item in wiring diagram)
/ option
Remarks
Control evaporator pump 1
J2A/Ch16
90-12
NRCP2-BASE main board (A1)
The controller can regulate one or two evaporator pumps and
takes care of the automatic changeover between pumps.
Control evaporator pump 2
J2A/Ch17
90A-12
NRCP2-BASE main board (A1)
The controller can regulate one or two evaporator pumps and
takes care of the automatic changeover between pumps.
Control condenser pump 1
J2A/Ch18
95-12
NRCP2-BASE main board (A1)
The controller can regulate one or two condenser pumps and
takes care of the automatic changeover between pumps.
Control condenser pump 2
J2A/Ch19
95A-12
NRCP2-BASE main board (A1)
The controller can regulate one or two condenser pumps and
takes care of the automatic changeover between pumps.
Alarm relay output
J3/Ch24
30A-31A
NRCP2-BASE main board (A1)
Indicates the alarms.
Running relay output
J3/Ch25
37-38
NRCP2-BASE main board (A1)
This output is ON when at least one compressor is running.
Contact 1: on/off
J4/Ch08
32-33
NRCP2-BASE main board (A1)
This contact is used for the unit on/off control. It is only taken
into consideration if the unit is in the remote operating mode
(remote mode).
Contact 2: selection of second setpoint
J4/Ch09
65-66
NRCP2-BASE main board (A1)
This contact is only taken into consideration if the unit is in the
remote operating mode (remote mode).
Contact 3: capacity limit selection 1
J4/Ch10
73-74
NRCP2-BASE main board (A1)
See description in chapter 3.7.4.
Contact 4: heating/cooling mode selection
(water-cooled heat pump unit only)
J5/Ch12 (shown
on terminal)
34-35
NRCP2-BASE main board (A1)
This contact is only taken into consideration if the unit is in the
remote operating mode (remote mode).
User safety loop input
J4/Ch11a
34-35
NRCP2-BASE main board (A1)
This contact is used for the customer safety loops that require
unit shut-down if it is closed. Alarm P-91 is triggered.
Options
Three-way valve control output (0-10 V)
J8/Ch7 (shown on
terminal)
80-80+
NRCP2-BASE main board (A1 -
option 152)
The control allows control of a three-way valve based on the
saturated condensing temperature.
Contact, occupancy mode override
J4/Ch08
77-78
NRCP2-BASE EMM (A3)/energy
management (option 156)
In the remote operating mode this allows control of the unit
occupancy (occupied/unoccupied).
Contact 3bis: capacity limit selection 2
J4/Ch09
73A-74A
NRCP2-BASE EMM (A3)/energy
management
This contact is only available with the energy management
option (see chapter 3.7.4).
User safety loop input
J4/Ch10
34A-35A
NRCP2-BASE EMM (A3)/energy
management (option 156)
This contact is used for the customer safety loops that require
unit shut-down if it is closed. This contact is only available with
the energy management option.
Ice storage contact
J4/Ch11a
75-76
NRCP2-BASE EMM (A3)/energy
management (option 156)
This contact is used to select the chilled-water setpoint.
Relay output for unit shut-down after an
alarm
J3/Ch24
30-31
NRCP2-BASE EMM (A3)/energy
management (option 156)
Indicates if the unit has completely shut down due to an alarm.
Relay output for an alert
J3/Ch25
30B-31B
NRCP2-BASE EMM (A3)/energy
management (option 156)
Indicates alerts.
Condenser flow switch input
J5/Ch13 (shown
on terminal)
96-97
NRCP2-BASE EMM (A3)/energy
management (option 156)
Shows that there is water flow on the condenser side.
Space temperature input for setpoint
reset
J6/Ch02 (shown
on terminal)
71A-72A
NRCP2-BASE EMM (A3)/energy
management (option 156)
Allows setpoint reset, if space temperature reset is selected.
Setpoint reset input
J7A/Ch05 (shown
on terminal)
71-72
NRCP2-BASE EMM (A3)/energy
management (option 156)
Allows setpoint reset, if reset via the 4-20 mA input is selected.
Capacity limitation input
J7B/Ch06 (shown
on terminal)
67-68
NRCP2-BASE EMM (A3)/energy
management (option 156)
Allows capacity limitation with a 4-20 mA signal.
Compressor A operation input
J2A/Ch16 (shown
on terminal)
37A1-
38A1
NRCP2-BASE EMM (A3)/energy
management (option 156)
Compressor A operating status.
Compressor B operation input
J2A/Ch17 (shown
on terminal)
37B1-
38B1
NRCP2-BASE EMM (A3)/energy
management (option 156)
Compressor B operating status.
Unit capacity output (0-10 V)
J8/Ch7 (shown on
terminal)
79+-79-
NRCP2-BASE EMM (A3)/energy
management (option 156)
This output reports the capacity percentage of the unit.
Refrigerant leak detection input 1
J7/Ch13 (shown
on terminal)
45-1-46-1 PD-AUX (A4)/leak detection
(option 159)
This input is used with the refrigerant leak detection option.
Refrigerant leak detection input 2
J8/Ch14 (shown
on terminal)
45-2-46-2 PD-AUX (A4)/leak detection
(option 159)
This input is used with the refrigerant leak detection option.
CCN connection
ST3-HMI
An RS-485 bus is used for connection to the CCN.
- Pin 1:
- Pin 2: ground
- Pin 3: signal -
