33
CARRIER COMFORT NETWORK INTERFACE
The Carrier Comfort Network
®
(CCN) communication bus
wiring is supplied and installed by the electrical contractor. It
consists of shielded, 3-conductor cable with drain wire.
The system elements are connected to the communication bus
in a daisy chain arrangement. The positive pin of each system
element communication connector must be wired to the posi-
tive pins of the system element on either side of it. The nega-
tive pins must be wired to the negative pins. The signal ground
pins must be wired to the signal ground pins. See Fig. 16 for lo-
cation of the CCN network connections on the terminal strip
labeled CCN.
NOTE: Conductors and drain wire must be 20 AWG (Ameri-
can Wire Gage) minimum stranded, tinned copper. Individual
conductors must be insulated with PVC, PVC/nylon, vinyl,
Teflon
1
, or polyethylene. An aluminum/polyester 100% foil
shield and an outer jacket of PVC, PVC/nylon, chrome vinyl,
or Teflon with a minimum operating temperature range of –4°F
to 140°F (–20°C to 60°C) is required. See table below for ca-
bles that meet the requirements.
When connecting the CCN communication bus to a system ele-
ment, a color code system for the entire network is recom-
mended to simplify installation and checkout. The following
color code is recommended:
If a cable with a different color scheme is selected, a similar
color code should be adopted for the entire network.
At each system element, the shields of its communication bus
cables must be tied together. If the communication bus is en-
tirely within one building, the resulting continuous shield must
be connected to ground at only one single point. See Fig. 16. If
the communication bus cable exits from one building and en-
ters another, the shields must be connected to ground at the
lightning suppressor in each building where the cable enters or
exits the building (one point only).
To connect the 19DV chiller to the network, proceed as follows
(see Fig. 16):
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.
Step 6 — Install Field Insulation
When installing insulation at the jobsite, insulate the following
components:
• compressor motor
• economizer
• evaporator shell
• evaporator tube sheets
• suction piping
• motor cooling drain
• inhibitor reclaim piping
• purge tank and connecting tubing
• low side of purge system independent refrigerant circuit
• refrigerant liquid line to evaporator
NOTE: Insulation of the waterbox covers is applied only at the
jobsite by the contractor. When insulating the covers, make
sure there is access for removal of waterbox covers for servic-
ing. See Fig. 26.
1. Teflon is a registered trademark of DuPont.
MANUFACTURER CABLE NO.
ALPHA 2413 or 5463
AMERICAN A22503
BELDEN 8772
COLUMBIA 02525
SIGNAL TYPE
CCN BUS
CONDUCTOR
INSULATION
COLOR
CCN NETWORK
INTERFACE
(CONTROL PANEL)
+ Red +
GROUND White G
– Black –
CAUTION
Protect insulation from weld heat damage and weld
splatter. Cover with wet canvas cover during water pip-
ing installation.
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