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.

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.

SINGLE-CIRCUIT UNITS

Description

Connector/channel

Terminal

Board

Remarks

Remarks

Alarm relay output

J3 / CH24

30 - 31

NRCP-BASE

Indicates alarms

Volt-free contact 24 V a.c.

Boiler relay output

J3 / CH25

37 - 38

NRCP-BASE

Boiler start/stop control output.

48 V d.c. max, 20 V a.c. or

V d.c., 3 A max, 80 mA min,

 

 

 

 

See section 5.13.

 

 

 

 

external power supply.

 

 

 

 

 

 

 

 

 

 

Connector: 4 pin

 

 

 

 

 

WAGO 734-104 pitch 3.5.

 

 

 

 

 

One per board needed.

Contact 1:

J4 / CH8

32 - 33

NRCP-BASE

The contacts are used for unit start/stop and

24 V a.c., 20 mA

start/stop/heat/cool

 

 

 

heat/cool control. They are only taken into

 

 

 

 

 

account if the unit is under remote operation

Connector: 8 pin WAGO

 

 

 

 

control (rEM).

Contact 2:

J4 / CH9

63 - 64

NRCP-BASE

734-168, pitch 3.5

 

start/stop/heat/cool

 

 

 

 

 

 

 

 

 

See the description of these contacts in

 

 

 

 

 

sections 3.6.2 and 3.6.3.

 

 

 

 

 

 

 

Contact 3:

J4 / CH10

73 - 74

NRCP-BASE

Depending on the configuration, this dry

 

demand limit selection or

 

 

 

contact can be used for remote setpoint

 

setpoint selection

 

 

 

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.

 

User safety loop input

J4 / CH11a

34 - 35

NRCP-BASE

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.

 

 

 

 

 

 

 

Connection to CCN

J12

1 - 2 - 3

NRCP-BASE

An RS-485 bus is used for connection to the

Connector: 3 pin WAGO

 

 

 

 

CCN.

231-303, pitch 5.08

 

 

 

 

- Pin 1: signal +

 

- Pin 2: ground

- Pin 3: signal -

6

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Image 6
Carrier 30RA/RH, 30RY/RYH manual Controls, Connections at the users terminal block

30RY/RYH, 30RA/RH specifications

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