Carrier HFC-134A installation instructions Install Field Insulation and Lagging, Insulator Codes

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

	CCN BUS	CCN NETWORK
	CONDUCTOR
SIGNAL TYPE		INTERFACE
	INSULATION
		(Control Panel)
	COLOR
+	Red	+
Ground	White	G
–	Black	–

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

Protect insulation from weld heat damage and weld splat- ter. Cover with wet canvas cover during water piping installation.

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).

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