59
Carrier Comfort Network
R
(CCN) Interface
The units can be connected to the CCN if desired. The
communication bus wiring is a shielded, 3-conductor cable with
drain wire and is field supplied and installed. The system elements
are connected to the communication bus in a daisy chain
arrangement. (See Fig. 33.) The positive pin of each system
element communication connector must be wired to the positive
pins of the system elements on either side of it. This is also
required for the negative and signal ground pins of each system
element. Wiring connections for CCN should be made at the CIB.
(See Fig. 22 and 23.) Consult the CCN Contractor’s Manual for
further information.
NOTE: Conductors and drain wire must be 20 AWG (American
Wire Gauge) minimum stranded, tinned copper. Individual
conductors must be insulated with PVC, PVC/nylon, vinyl,
Teflon*, or polyethylene. An aluminum/polyester 100% foil shield
and an outer jacket of PVC, PVC/nylon, chro me vinyl, or Teflon
with a minimum operating temperature range of –20_Cto60_Cis
required. See Table below for acceptable wiring.
MANUFACT URER PART NO.
Alpha 2413 or 5463
Belden 8772
Carol C2528
West Penn 302
It is important when connecting to a CCN communication bus that
a color-coding scheme be used for the entire network to simplify
the installation. It is recommended that red be used for the signal
positive, black for the signal negative and white for the signal
ground. Use a similar scheme for cables containing different
colored wires.
*Teflon is a registered trademark of DuPont.
At each system element, the shields of its communication bus
cables must be tied together. The shield screw on CIB can be used
to tie the cables together. If the communication bus is entirely
within one building, the resulting continuous shield must be
connected to a ground at one point only. The shield screw on CIB
is not acceptable for grounding. If the communication bus cable
exits from one building and enters another, the shields must be
connected to grounds at the lightning suppressor in each building
where the cable enters or exits the building (one point per building
only).
To connect the unit to the network:
1. Turn off power to the control box.
2. Cut the CCN wire and strip the ends of the red (+), white
(ground), and black (–) conductors. (Substitute appropriate
colors for dif ferent colored cables.)
3. Connect the red wire to (+) terminal on CIB, the white wire
to COM terminal, and the black wire to the (–) terminal.
4. The RJ14 CCN connector on CIB can also be used, but is
only intended for temporary connection (for example, a
laptop computer running Carrier network software).
5. Restore power to unit.
IMPORTANT: A shorted CCN bus cable will prev ent some
routines from running and may prevent the unit from starting. If
abnormal conditions occur, unplug the connector. If conditions
return to normal, check the CCN connector and cable. Run new
cable if necessary. A short in one section of the bus can cause
problems with all system elements on the bus.
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