Carrier EVERGREEN HFC-134A User Manual

Page 44

When connecting the CCN communication bus to a system

element, a color code system for the entire network is recom-

mended to simplify installation and checkout. See Table 14 for

the recommended color codes:

Table 14 — Insulator Codes

If a cable with a different color scheme is selected, a similar

color code should be adopted for the entire network.
NOTE: This color scheme does not apply to SIO wiring

between the CCM and Gateway module.

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 ground at only one single point. See

Fig. 49. If the communication bus cable exits from one build-

ing and enters another, the shields must be connected to ground

at the lightening suppressor in each building where the cable

enters or exits the building (one point only).

To connect the 23XRV chiller to the network, proceed as

follows (see Fig. 49):

1. Route wire through knockout in back of control panel.
2. Strip back leads.
3. Crimp one no. 8 size spring spade terminal on each

conductor.

4. Attach red to “+” terminal and white to “G” terminal and

black to “–” terminal of CCN Network interface located

in the control panel.

Lead-Lag Control Wiring —

The 23XRV can be

wired for lead-lag operation in either series or parallel. See

Fig. 53 for applicable wiring schematics.

Install Field Insulation and Lagging

When installing insulation at the job site, insulate the fol-

lowing components:
• compressor

• discharge pipe assembly

• cooler shell

• cooler tube sheets

• condenser shell

• condenser tubesheets

• suction piping

• economizer

• economizer muffler

• motor cooling drain

• oil reclaim piping

• vaporizer chamber

• refrigerant liquid line to cooler
NOTE: Insulation of the waterbox covers is applied only at the

job site by the contractor. When insulating the covers, make

sure there is access for removal of waterbox covers for servic-

ing (Fig. 54).

SIGNAL TYPE

CCN BUS

CONDUCTOR

INSULATION

COLOR

CCN NETWORK

INTERFACE

(Control Panel)

Red

Ground

White

–

Black

–

Protect insulation from weld heat damage and weld splat-

ter. Cover with wet canvas cover during water piping

installation.