Carrier 23 XL Carrier Comfort Network Communication Bus Wiring, Manufacturer Cable no

IMPORTANT: Do not insulate terminals until wiring arrangement has been checked and approved by Carrier start-up personnel. Also, make sure correct phas- ing is followed for proper motor rotation.

INSULATE MOTOR TERMINALS AND LEAD WIRE ENDS Ð Insulate compressor motor terminals, lead wire ends, and electrical wires to prevent moisture condensation and electrical arcing. Obtain insulation material from machine shipping package (located inside the motor terminal box) con- sisting of 3 rolls of insulation putty and one roll of vinyl tape.

1.Insulate each terminal by wrapping with one layer of in- sulation putty.

2.Overwrap putty with 4 layers of vinyl tape.

NOTE: Installer is responsible for any damage caused by improper wiring between starter and compressor motor.

→CONNECT POWER WIRE TO OIL HEATER CONTAC- TOR (FRAME 1 AND 2) Ð Connect control power wiring between the oil heater contactor terminals (Fig. 29) and terminals LL1 and LL2 on the ®eld wiring strip in the compressor motor starter. Refer to Fig. 29 and wiring label on the chiller power panel

Voltage to terminals LL1 and LL2 comes from a con- trol transformer in a starter built to Carrier speci®- cations. Do not connect an outside source of control power to the compressor motor starter (terminals LL1 and LL2). An outside power source will produce dan- gerous voltage at the line side of the starter, because supplying voltage at the transformer secondary termi- nals produces input level voltage at the transformer primary terminals.

NOTE: The voltage selector switch in the machine power panel is factory set for 115 v control power source. When a 230 v control power source is used, set the voltage selector switch at 230 v.

The optional hot gas bypass valve is factory wired for 115 volts. If 230 v is used for control voltage, discon- nect the red wire from the piggy-back terminal oil heater contactor terminal 23 and yellow wire from the piggy- back on pilot relay 3C terminal No. 4. Then connect the red and yellow wires together with a splice connector.

CARRIER COMFORT NETWORK INTERFACE Ð The Carrier Comfort Network (CCN) communication bus wiring is supplied and installed by the controls/electrical contractor (if required). The wiring consists of shielded, 3-conductor cable with drain wire.

The system elements are connected to the communication bus in a daisy chain arrangement. The positive pin of each system element communication connector must be wired to the positive pins of the system element on either side of it. The negative pins must be wired to the negative pins. The signal ground pins must be wired to the signal ground pins. See Fig. 30 for location of the CCN network connector (COMM1) on the processor module.

LEGEND

Field Wiring

Power Panel Component Terminal

Fig. 29 Ð Oil Heater and Control Power Wiring Diagram (Frame 1 and 2 Machines)

CONNECT COMMUNICATION AND CONTROL WIR- ING FROM STARTER TO POWER PANEL Ð Connect control wiring from main motor starter to the machine power panel. All control wiring must use shielded cable. Also, connect the communications cable. Refer to the job wiring diagrams for cable type and cable number. Make sure the control circuit is grounded in accordance with applicable electrical codes and instructions on machine control wiring label.

Fig. 30 Ð Carrier Comfort Network

Communication Bus Wiring

NOTE: Conductors and drain wire must be 20 AWG (American Wire Gage) minimum stranded, tinned cop- per. Individual conductors must be insulated with PVC, PVC/nylon, vinyl, Te¯on, or polyethylene. An aluminum/ polyester 100% foil shield and an outer jacket of PVC, PVC/ nylon, chrome vinyl, or Te¯on with a minimum operat- ing temperature range of −4 F to 140 F (−20 C to 60 C) is required. See table below for cables that meet the requirements.

MANUFACTURER	CABLE NO.
Alpha	2413 or 5463
American	A22503
Belden	8772
Columbia	02525

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