Filter
Top Products
6
3.6 - Connections at the user's terminal block
3.6.1 - General description
The contacts below are available at the user's terminal block on
the NRCP-BASE board (see figure 1). Some of them can only
be used if the unit operates in remote operating type (rEM).
The following table summarises the connections at the user’s
terminal block.
Description
Alarm relay output
Boiler relay output
Contact 1:
start/stop/heat/cool
Contact 2:
start/stop/heat/cool
Contact 3:
demand limit selection or
setpoint selection
User safety loop input
Connection to CCN
Connector/channel
J3 / CH24
J3 / CH25
J4 / CH8
J4 / CH9
J4 / CH10
J4 / CH11a
J12
Terminal
30 - 31
37 - 38
32 - 33
63 - 64
73 - 74
34 - 35
1 - 2 - 3
Board
NRCP-BASE
NRCP-BASE
NRCP-BASE
NRCP-BASE
NRCP-BASE
NRCP-BASE
NRCP-BASE
Remarks
Indicates alarms
Boiler start/stop control output.
See section 5.13.
The contacts are used for unit start/stop and
heat/cool control. They are only taken into
account if the unit is under remote operation
control (rEM).
See the description of these contacts in
sections 3.6.2 and 3.6.3.
Depending on the configuration, this dry
contact can be used for remote setpoint
selection or demand limit selection (see
sections 4.3.11.3 and 3.6.4).
- The remote setpoint selection contact is
only taken into account if the unit is in
remote control operating type.
- The remote demand limit selection contact
is active whatever the operating type of the
unit.
This contact is mounted in series with the
water flow control contact. It can be used for
any customer safety loop that requires that
the unit is stopped, if it is open.
If it is unused this contact must be bridged.
An RS-485 bus is used for connection to the
CCN.
- Pin 1: signal +
- Pin 2: ground
- Pin 3: signal -
Remarks
Volt-free contact 24 V a.c.
48 V d.c. max, 20 V a.c. or
V d.c., 3 A max, 80 mA min,
external power supply.
Connector: 4 pin
WAGO 734-104 pitch 3.5.
One per board needed.
24 V a.c., 20 mA
Connector: 8 pin WAGO
734-168, pitch 3.5
Connector: 3 pin WAGO
231-303, pitch 5.08
SINGLE-CIRCUIT UNITS
3.5 - The controls
Evaporator pumps
The controller can regulate one or two evaporator pumps and
takes care of automatic change-over between pumps.
Evaporator heater
It protects the evaporator (and the pipe heater for units without
pump) against freezing if the unit is off.
Boiler
This relay output authorises start/stop of a boiler.
Condensate defrost heater
This heater is used for heat pump units and is located at the
bottom of the air heat exchanger of each circuit. It prevents ice
build-up, if defrost cycles are initiated at low outdoor
temperatures.