Carrier 30RAP010-060 specifications Thermistor Designations, Status Inputs, Output Relays

3.Connect the red wire to (+) terminal on LVT of the plug, the white wire to COM terminal, and the black wire to the

(–) terminal.

4.The RJ14 CCN connector on LVT can also be used, but is only intended for temporary connection (for example, a laptop computer running Service Tool).

IMPORTANT: A shorted CCN bus cable will prevent some routines from running and may prevent the unit from start- ing. If abnormal conditions occur, unplug the connector. If conditions return to normal, check the CCN connector and cable. Run new cable if necessary. A short in one section of the bus can cause problems with all system elements on the bus.

Table 15 — Thermistor Designations

	PIN
THERMISTOR	CONNECTION	THERMISTOR INPUT
	POINT
LWT	J8-13,14 (MBB)	Cooler Leaving Fluid
EWT	J8-11,12 (MBB)	Cooler Entering Fluid
RGTA	J8-1,2 (MBB)	Circuit A Return Gas
		Temperature
RGTB	J8-3,4 (MBB)	Circuit B (035-060 only)
		Return Gas Temperature
OAT	J8-7,8 (MBB)	Outdoor-Air Temperature
		Sensor
SPT	J8-5,6 (MBB)	Accessory Remote Space
	TB5-5,6	Temperature Sensor or
		Dual LWT Sensor
DTT	J6-1,2 (AUX)	Discharge Temperature
		Thermistor

LEGEND

LWT — Leaving Water Temperature

MBB — Main Base Board

Table 16 — Status Inputs

STATUS SWITCH	PIN CONNECTION POINT
Chilled Water Pump 1	J7-1,2
Chilled Water Pump 2	J7-3,4
Remote On/Off	LVT-13,14
Cooler Flow Switch	J7-9,10
Compressor Fault Signal, A1	J9-11,12
Compressor Fault Signal, A2	J9-5,6
Compressor Fault Signal, B1	J9-8,9
Compressor Fault Signal, B2	J9-2,3

	Table 17 — Output Relays
RELAY	DESCRIPTION
NO.
K1	Energize Compressor A1 (010-030)
	Energize Compressor A1 and Condenser Fan Contac-
	tor 3 (055,060)
K2	Energize Compressor A2 (all but 010, 015 60 Hz)
K3	Energize Chilled Water Pump 1 Output
K4	Energize Chilled Water Pump 2 Output
K5	Energize Compressor B1 (035-050)
	Energize Compressor B1 and Condenser Fan Contac-
	tor 3 (055,060)
K6	Energize Compressor B2 (035-060)
K7	Alarm Relay
K8	Cooler/Pump Heater
K9	Energize Condenser Fan Contactor 1 (018-060)
K10	Energize Condenser Fan Contactor 2 (018-060)
K11	Minimum Load Valve

Table 18 — CCN Communication Bus Wiring

MANUFACTURER	PART NO.
	Regular Wiring	Plenum Wiring
Alpha	1895	—
American	A21451	A48301
Belden	8205	884421
Columbia	D6451	—
Manhattan	M13402	M64430
Quabik	6130	—

Sensors — The electronic control uses 4 to 7 thermistors to sense temperatures for controlling chiller operation. See Table 15. These sensors are outlined below. Thermistors RG- TA, RGTB, EWT, LWT, and OAT are identical in temperature versus resistance and voltage drop performance. The dual chill- er thermistor is 5 kΩ at 77 F (25 C) thermistor. Space tempera- ture thermistor is a 10 kΩ at 77 F (25 C). The DTT thermistor is an 86 kΩ at 77 F (25 C) thermistor. See Thermistors section for temperature-resistance-voltage drop characteristics.

COOLER LEAVING FLUID SENSOR — The thermistor is installed in a well in the factory-installed leaving fluid piping coming from the bottom of the brazed-plate heat exchanger.

COOLER ENTERING FLUID SENSOR —The thermistor is installed in a well in the factory-installed entering fluid piping coming from the top of the brazed-plate heat exchanger.

COMPRESSOR RETURN GAS TEMPERATURE SEN- SOR — These thermistors are installed in a well located in the suction line of each circuit.

OUTDOOR-AIR TEMPERATURE SENSOR (OAT) — This sensor is factory installed on a bracket which is inserted through the base pan of the unit.

DISCHARGE TEMPERATURE THERMISTOR (DTT) — This sensor is only used on units with a digital compressor. The sensor is mounted on the discharge line close to the discharge of the digital compressor. It attaches to the dis- charge line using a spring clip and protects the system from high discharge gas temperature when the digital compressor is used. This sensor is a connected to the AUX board.

REMOTE SPACE TEMPERATURE SENSOR OR DUAL LEAVING WATER TEMPERATURE SENSOR — One of two inputs can be connected to the LVT. See appropriate sen- sor below.

Remote Space Temperature Sensor — Sensor (part no. 33ZCT55SPT) is an accessory sensor that is remotely mounted in the controlled space and used for space temperature reset. The sensor should be installed as a wall-mounted thermostat would be (in the conditioned space where it will not be sub- jected to either a cooling or heating source or direct exposure to sunlight, and 4 to 5 ft above the floor).

Space temperature sensor wires are to be connected to terminals in the unit main control box. The space temperature sensor includes a terminal block (SEN) and a RJ11 female connector. The RJ11 connector is used access into the Carrier Comfort Network® (CCN) at the sensor.

To connect the space temperature sensor (Fig. 10):

1.Using a 20 AWG twisted pair conductor cable rated for the application, connect 1 wire of the twisted pair to one SEN terminal and connect the other wire to the other SEN terminal located under the cover of the space temperature sensor.

2.Connect the other ends of the wires to terminals 5 and 6 on TB5 located in the unit control box.

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