Figure 7.32 Communications Interface Installation - Carrier 69NT40-541-001 Operation And Service

Container refrigeration units

Table of Contents

7.26 COMMUNICATIONS INTERFACE MODULE INSTALLATION

Units with communication interface module provision have the required wiring installed. The provision wiring kit

(part number 76-00685-00), includes three pre-addressed wires installed between the circuit breaker and commu-

nication interface module locations. These wires are to be connected to the module and circuit breaker to allow the

module to communicate over the power system. To install the module, do the following:

THE UNIT POWER PLUG MUST BE DISCONNECTED TO REMOVE POWER FROM CIRCUIT

BREAKER CB1

a. CB1 is connected to the power system, see wiring schematic. Ensure that the unit power is off AND that the

unit power plug is disconnected.

b. Open control box, see

c. Remove the circuit breaker panel, with circuit breaker, from the control box.

d. Locate, wires CB21/CIA3, CB22/CIA5 and CB23/CIA7 that have been tied back in the wire harness.

Remove the protective heat shrink from the ends of the wires.

e. Attach the three wires as addressed to the LOAD side of the circuit breaker.

f. Refit the circuit breaker panel.

g. Fit the new RMU into the unit.

h. Remove plugs CIA, CIB and CID from the wiring harness and attach to the module.

Replace the low voltage shield.

7.27 POWER FACTOR CORRECTOR CAPACITORS (PFC)

The power factor corrector capacitors are of the permanent-split capacitor type. There are a total of three capaci-

tors with discharge resistors enclosed in a single case.

a. When to check for a defective capacitor

The capacitors assist in correcting current draw by the compressor. If one or more of the capacitors is faulty, there

will be an imbalance in current. In addition, the power consumption of the unit will increase.