Carrier 30GTR Specifications download pdf (Page 4)

It is important when connecting to a CCN communication

bus that a color coding scheme be used for the entire net-

work to simplify the installation. It is recommended that red

be used for the signal positive, black for the signal negative,

and white for the signal ground. Use a similar scheme for

cables containing different colored wires.

At each system element, the shields of its communication

bus cables must be tied together. If the communication bus

is entirely within one building, the resulting continuous shield

must be connected to a ground at one point only. If the com-

munication bus cable exits from one building and enters an-

other, the shields must be connected to grounds at the light-

ning suppressor in each building where the cable enters or

exits the building (one point per building only). To connect

the unit to the network:

1. Turn off power to the control box.

2. Cut the CCN wire and strip the ends of the red (+), white

(ground), and black (−) conductors. (Substitute appropri-

ate colors for different colored cables.)

3. Connect the red wire to (+) terminal on TB3 of the plug,

the white wire to COM terminal, and the black wire to

the (−) terminal.

4. The RJ14 CCN connector on TB3 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 starting. 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 2 — Thermistor Designations

THERMISTOR

NO.

CONNECTION

POINT

THERMISTOR INPUT

T1 J8-13,14 (MBB) Cooler Leaving Fluid

T2 J8-11,12 (MBB) Cooler Entering Fluid

T3 J8-21,22 (MBB)

Saturated Condensing

Temperature, Ckt A

T4 J8-15,16 (MBB)

Saturated Condensing

Temperature, Ckt B

T5 J8-24,25 (MBB)

Cooler Suction Temperature,

Ckt A (EXV Only)

T6 J8-18,19 (MBB)

Cooler Suction Temperature,

Ckt B (EXV Only)

T7 J5-11,12 (EXV)

Compressor Suction Gas

Temperature, Ckt A (EXV Only)

T8 J5-9,10 (EXV)

Compressor Suction Gas

Temperature, Ckt B (EXV Only)

T9 J8-7,8 (MBB)

Outdoor-Air Temperature Sensor

(Accessory)

T10 J8-5,6 (MBB)

Remote Space Temperature

Sensor (Accessory)

LEGEND

EXV — Electronic Expansion Valve

MBB — Main Base Board

Table 3 — Status Switches

STATUS SWITCH

CONNECTION

POINT

040-060 (50 Hz)

040-070 (60 Hz)

070

(50 Hz)

080, 230B

090-110,

245B-315B

130

(60 Hz)

130 (50 Hz)

150, 230A-255A

170,190,

270A,290A,330A/B,

360A/B, 390B

210, 315A,

390A, 420A/B

Oil Pressure, Ckt B J7-1, 2 (MBB) Not Used* OPSB OPSB OPSB OPSB OPSB OPSB

Oil Pressure, Ckt A J7-3, 4 (MBB) Not Used* OPSA OPSA OPSA OPSA OPSA OPSA

Remote On/Off TB5-13, 14 Field-Installed Relay Closure

Compressor Fault

Signal, B3

J5-8, 12 (CXB) Not Used Not Used Not Used Not Used Not Used CR-B3 CR-B3

Compressor Fault

Signal, B2

J9-2, 12 (MBB) Not Used Not Used CPCS-B2 CR-B2 CR-B2 CR-B2 CR-B2

Compressor Fault

Signal, B1

J9-8, 12 (MBB) CR/CPCS-B1† CPCS-B1 CPCS-B1 CR-B1 CR-B1 CR-B1 CR-B1

Compressor Fault

Signal, A4

J5-5, 12 (CXB) Not Used Not Used Not Used Not Used Not Used Not Used CR-A4

Compressor Fault

Signal, A3

J5-11, 12 (CXB) Not Used Not Used Not Used Not Used CR-A3 CR-A3 CR-A3

Compressor Fault

Signal, A2

J9-5, 12 (MBB) Not Used CPCS-A2 CPCS-A2 CR-A2 CR-A2 CR-A2 CR-A2

Compressor Fault

Signal, A1

J9-11, 12 (MBB) CR/CPCS-A1† CPCS-A1 CPCS-A1 CR-A1 CR-A1 CR-A1 CR-A1

LEGEND

CPCS — Compressor Protection Control System

CR — Control Relay

CXB — Compressor Expansion Board

MBB — Main Base Board

OPS — Oil Pressure Switch, Circuit A or B

*The OPS can also be added as an accessory.

†The CPCS can be added as an accessory.

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Carrier 30GTR Specifications Page 4

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