Carrier 69NT40-541-306, Операция и обслуживание

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7–45 T-354
7.28 COMMUNICATIONS INTERFACE MODULE INSTALLATION
Figure 7.35 Communications Interface 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:
WARNING
!
The unit power plug must be disconnected to remove power from circuit breaker CB1
1. 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.
2. Open control box, see Figure 7.35 and remove low voltage shield. Open high voltage shield.
3. Remove the circuit breaker panel, with circuit break er, from the control box.
4. 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.
5. Attach the three wires as addressed to the LOAD side of the circuit breaker.
6. Refit the circuit breaker panel.
7. Fit the new RMU into the unit.
8. Remove plugs CIA, CIB and CID from the wiring har ness and attach to the module.
9. Replace the low voltage shield.
7.29 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.
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.
CB1
Communications
Interface Module