Ccn Communication Bus Wiring; Typical Space Temperature Sensor Wiring; Ccn Communications Bus Wiring To Optional Space Sensor Rj11 Connector; Cooler Leaving Fluid Sensor - Carrier AQUASNAP 30RAP010-150 Controls, Start-Up, Operation, Service, And Troubleshooting

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 appropri-
ate colors for different colored cables.)
3. Connect the red wire to (+) terminal on LVT of the plug,
the white wire to COM terminal, and the black wire to the
(–) terminal.
4. The RJ14 CCN connector on LVT can also be used, but is
only intended for temporary connection (for example, a
laptop computer running Service Tool).
IMPORTANT: A shorted CCN bus cable will prevent some
routines from running and may prevent the unit from start-
ing. 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.
Table 8 — CCN Communication Bus Wiring
MANUFACTURER
Regular Wiring
Alpha
American A21451
Belden
Columbia D6451
Manhattan M13402
Quabik
The electronic control uses 4 to 7 thermistors to
Sensors —
sense temperatures for controlling chiller operation. See
Table 4. These sensors are outlined below. Thermistors RGTA,
RGTB, EWT, LWT, and OAT are 5 kat 77 F (25 C) thermis-
tors and are identical in temperature versus resistance and volt-
age drop performance. The dual chiller thermistor is 5 kat
77 F (25 C) thermistor. Space temperature thermistor is a
10 kat 77 F (25 C). The DTT thermistor is an 86 kat 77 F
(25 C) thermistor. See Thermistors section for temperature-
resistance-voltage drop characteristics.
COOLER LEAVING FLUID SENSOR — The thermistor is in-
stalled in a well in the factory-installed leaving fluid piping
coming from the bottom of the brazed-plate heat exchanger.
COOLER ENTERING FLUID SENSOR — The thermistor is
installed in a well in the factory-installed entering fluid piping
coming from the top of the brazed-plate heat exchanger.
COMPRESSOR RETURN GAS TEMPERATURE SEN-
SOR — These thermistors are installed in a well located in the
suction line of each circuit.
OUTDOOR-AIR TEMPERATURE SENSOR (OAT) —
This sensor is factory installed on a bracket which is inserted
through the base pan of the unit.
DISCHARGE TEMPERATURE
(DTT) — This sensor is only used on units with the digital
compressor option. The sensor is mounted on the discharge
line close to the discharge of the digital compressor. It attaches
to the discharge line using a spring clip and protects the system
from high discharge gas temperature when the digital compres-
sor is used. This sensor is a connected to the AUX board.

REMOTE SPACE TEMPERATURE SENSOR OR DUAL

LEAVING WATER TEMPERATURE SENSOR — One of
two inputs can be connected to the LVT. See appropriate sen-
sor below.
Remote Space Temperature Sensor — Sensor (part no.
33ZCT55SPT) is an accessory sensor that is remotely mounted
in the controlled space and used for space temperature reset.
PART NO.
Plenum Wiring
1895 —
A48301
8205 884421
—
M64430
6130 —
THERMISTOR
The sensor should be installed as a wall-mounted thermostat
would be (in the conditioned space where it will not be sub-
jected to either a cooling or heating source or direct exposure
to sunlight, and 4 to 5 ft above the floor).
Space temperature sensor wires are to be connected to
terminals in the unit main control box. The space temperature
sensor includes a terminal block (SEN) and a RJ11 female
connector. The RJ11 connector is used access into the Carrier
Comfort Network (CCN) at the sensor.
®
To connect the space temperature sensor (Fig. 16):
1. Using a 20 AWG twisted pair conductor cable rated for
the application, connect 1 wire of the twisted pair to one
SEN terminal and connect the other wire to the other
SEN terminal located under the cover of the space
temperature sensor.
2. Connect the other ends of the wires to LVT-22,23 located
in the unit control box.
SPT (T10) PART NO. 33ZCT55SPT
SENSOR
SEN
Fig. 16 — Typical Space Temperature
Sensor Wiring
Units on the CCN can be monitored from the space at the
sensor through the RJ11 connector, if desired. To wire the RJ11
connector into the CCN (Fig. 17):
IMPORTANT: The cable selected for the RJ11 connector
wiring MUST be identical to the CCN communication bus
wire used for the entire network. Refer to Table 8 for
acceptable wiring.
TO CCN
COMM 1
BUS (PLUG)
AT UNIT
Fig. 17 — CCN Communications Bus Wiring
to Optional Space Sensor RJ11 Connector
1. Cut the CCN wire and strip ends of the red (+), white
(ground), and black (–) conductors. (If another wire color
scheme is used, strip ends of appropriate wires.)
2. Insert and secure the red (+) wire to terminal 5 of the
space temperature sensor terminal block.
3. Insert and secure the white (ground) wire to terminal 4 of
the space temperature sensor.
4. Insert and secure the black (–) wire to terminal 2 of the
space temperature sensor.
26
a30-4968
SEN
T-55 SPACE
SENSOR
CCN+
CCN GND
CCN-
LVT
22
23
6
5
4
3
2
1