157
Table 11 — CCN Communication Bus Wiring
4. The RJ14 CCN connector on TB3 can also be used, but is
only intended for temporary connection (for example, a lap-
top computer running service tool).
NON-CCN COMMUNICATION WIRING
The 30XA units offer several non-CCN translators. Refer to the
separate installation instructions for additional wiring steps.
FIELD CONTROL OPTION WIRING
Install field control wiring options. Some options, such as 4 to 20
mA demand limit that requires the energy management module,
may require that accessories be installed first (if not factory in-
stalled) for terminal connections.
DUAL CHILLER LEAVING WATER SENSOR
If the dual chiller algorithm is used and the machines are installed
in parallel, an additional chilled water sensor must be installed for
each chiller. Install the wells in the common leaving water header.
See Fig 60. DO NOT relocate the chiller’s leaving water thermis-
tors. They must remain in place for the unit to operate properly.
The thermistor well is a
1
/
4
in. NPT fitting for securing the well in
the piping. The piping must be drilled and tapped for the well. Se-
lect a location that will allow for removal of the thermistor without
any restrictions.
Once the well is inserted, install the thermistors. Insert the therm-
istor into the well until the o-ring reaches the well body. Use the
nut on the thermistor to secure the thermistor in place. Once the
thermistor is in place, it is recommended that a thermistor wire
loop be made and secured with a wire tie to the chilled water pipe.
See Fig. 60.
For dual chiller control a CCN bus must be connected between the
two modules (Fig. 59). See the Carrier Comfort Network Commu-
nication Bus Wiring section for additional information.
MANUFACTURER
PART NUMBER
Regular Wiring Plenum Wiring
Alpha 1895 —
American A21451 A48301
Belden 8205 884421
Columbia D6451 —
Manhatten M13402 M64430
Quabik 6130 —
IMPORTANT: A shorted CCN bus cable will prevent
some routines from running and may prevent the unit
from starting. If abnormal conditions occur, disconnect
the machine from the CCN. If conditions return to nor-
mal, 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.
(+) (COM) (-) SHIELD
CCN
RED
WHT
BLK
CCNLEN
(+) (COM) (-) SHIELD
CCN
RED
WHT
BLK
CCNLEN
TO NEXT
DEVICE
(+) (COM) (-) SHIELD
CCN
RED
WHT
BLK
CCN
LEN
SHIELD
LEGEND
Fig. 59 — TB3 — CCN Wiring
CCN — Carrier Comfort Network®
LEN — Local Equipment Network
a30-4001
5/8 in. HEX
6" MINIMUM
CLEARANCE FOR
THERMISTOR
REMOVAL
1.188 in.
2.315 in.
1/4-18 NPT
Fig. 60 — Dual Chiller Accessory Kit Leaving Water Thermistor and Well (Part No. 00EFN900044000A)
a30-3999
WIRE TIE
LOOP
THERMISTOR WIRE
AND SECURE
TO CHILLED WATER PIPE
INSERT THERMISTOR UNTIL
O-RING MEETS THE
THERMISTOR WELL BODY.
a30-4000
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