Carrier 30GK manual User connections, Volt-free contacts 24 V a.c, Use of a shielded cable max

3.4 - User connections

The connections below are available at the customer’s terminal block. Some of them can only be used in special operating modes. For further details see the sections that describe the functions (section 5) and the configurations (section 4.2.1).

NOTE: The bridge between terminals 32, 63 and 65 on the customer’s terminal block must not be removed.

CONNECTION BLOCK

DESCRIPTION	CONNECTOR/CHANNEL	TERMINAL	DESCRIPTION	REMARKS
Alarm relay output, circuit A	J3 / CH24	30A - 31A	Indicates alarms in circuit A	Volt-free contacts 24 V a.c. 48
Alarm relay output, circuit B	J3 / CH25	30B - 31B	Indicates alarms in circuit B	V d.c. max, 20 V a.c. or V
				d.c., 3 A max, 80 mA min,
				external power supply.
				Connector: 6 pin WAGO
				231-306/026000 pitch 5.08.
User safety loop and chilled water	J4 / CH15a	34 - 35	This contact is mounted in series with the water flow	24 V a.c., 20 mA
pump interlock			control contact. It can be used for any user safety loop
			that requires that the unit is shut down, if it is open. The	Connector: 10 pin WAGO
			chilled water pump operation auxiliary contact is	734-110, pitch 3.5
			connected between these two terminals.
Remote start/stop	J4 / CH11	32 - 33	The remote start/stop command is only used if the unit is
			under remote operation control (rEM). See section 4.2.1.
Remote cooling setpoint selection	J4 / CH12	65 - 66	The remote cooling setpoint selection command is only
			used if the unit is under remote operation control (rEM).
			See section 4.2.1.
Remote heating/cooling control	J4 / CH13	63 - 64	The remote heating/cooling control command is only used
			if the unit is under remote operation control (rEM). See
or			section 4.2.1.
remote heat reclaim control	J4 / CH13	63 - 64	The command allows selection of the second condensing
			setpoint or of the heat reclaim mode. It is only used if the
			unit is under remote operation control (rEM). See section
			4.2.1.
Demand limit command	J4 / CH14	73 - 74	This contact permits activating the unit demand limit
			function. See section 5.8. This contact is active, whatever
			the operating type.
0-10 V d.c. setpoint reset or	J8 / CH10	71 - 72	This 0-10 V d.c. input is used for setpoint reset or unit	Connector: 2 pin WAGO 231-
demand limit entry			demand limit. It is active, whatever the unit operating type.	302/026000 pitch 5.08
			This 0-10 V signal can be supplied by a user command or
			a 0-10 V temperature sensor.
Connection to CCN	J12	1 - 2 - 3	A RS-485 bus is used for connection to the CCN.	Use of a shielded cable (max.
			The CCN connector is located on the CCN/clock board	length: 1000 m)
			(inserted on the PD4 Basic Board)	Shielding: braiding on 95% -
			- Pin 1: signal +	100% of the cable surface.
			- Pin 2: ground	Shielding connection at the
			- Pin 3: signal -	two cable ends.

AVAILABLE TERMINALS
Description	Connector/	Terminal	Description
	channel
Condenser water flow	J5/CH17		This contact is used to detect lack of condenser water flow and
switch input			shuts down the unit.
Evaporator 1 and 2 pump	J5/CH18		This contact is used to detect an evaporator pump operation
operation input			fault and switches over to the other evaporator pump*.
Evaporator 1 control	J2/CH19		This contact permits control of evaporator 1 pump by the unit*.
Evaporator 2 control	J2/CH20		This contact permits control of evaporator 2 pump by the unit*.
Condenser pump control	J2/CH21		This contact permits control of condenser pump by the unit*.

Remarks

24 V a.c - 20mA

24 V a.c. internal supply.

Max. consumption

-each output: 20 VA/10W

-for all 3: 40 VA/20 W if all are used

Legend

*Associated functions, if selected: automatic changeover, pump 1 and 2; manual or CCN selection; periodical; by default.

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