Carrier 69NT40-541-505, Operation And Service Manual, Page: 118 / 143

T-368 7–26
7.23 MAINTENANCE OF PAINTED SURFACES
The refrigeration unit is protected by a special paint
system against the corrosive atmosphere in which it
normally operates. However, should the paint system
be damaged, the base metal can corrode. In order to
protect the refrigeration unit from the highly corrosive
sea atmosphere or if the protective paint system is
scratched or damaged, clean area to bare metal using
a wire brush, emery paper, or equivalent cleaning
method. Immediately following cleaning, spray or brush
on zinc-rich primer. After the primer has dried, spray or
brush on finish coat of paint to match original unit color.
7.24 COMMUNICATIONS INTERFACE MODULE
INSTALLATION
Figure 7.30 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 communication 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 discon-
nected to remove power from circuit
breaker CB1
a. CB1 is connected to the power system, see wir-
ing schematic. Ensure that the unit power is off
AND that the unit power plug is disconnected.
b. Open control box, see Figure 7.30 and remove
low voltage shield. Open high voltage shield.
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.
i. Replace the low voltage shield.
CB1
Communications
Interface Module
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