Carrier WEATHERMAKER 48AJ User Manual

Page 31

T58 Communicating Thermostat — Carrier also has a fully

communicating thermostat which, if used, will be wired to the

CCN communication connections on TB3 as described in the

Carrier Comfort Network

Interface section below.

Carrier Comfort Network Interface — The rooftop units can

be connected to the CCN system. The communication bus

wiring is supplied and installed in the field. Wiring 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 positive pins of

the system element on either side of it, the negative pins must be

wired to the negative pins, and the signal pins must be wired to

signal ground pins. Wiring connections for CCN should be

made at the TB3 terminal block using the screw terminals. The

TB3 board also contains an RJ14 CCN plug that can be used to

connect a field service computer or other CCN device tempo-

rarily. There is also an RJ14 LEN (local equipment network)

connection that is used to connect a Navigator

™

device or

download software.

Conductors and drain wire must be 20 AWG minimum

stranded, tinned copper. Individual conductors must be insulat-

ed with PVC, PVC/nylon, vinyl, Teflon, 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 –20 C to 60 C (–4 F to 140 F) is

required. Table 9 lists cables that meet the requirements.

Table 9 — CCN Connection Approved Shield Cable

Table 10 — Color Code Recommendations

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 the communication bus cables

must be tied together. If the communication bus is entirely

within one building, the resulting continuous shield must be

connected to a ground at one point only. If the communication

bus cable exits from one building and enters another, the

shields must be connected to grounds at the lightning suppres-

sor 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. (If a different net-

work color scheme is used, substitute appropriate colors.)

3. Remove the 3-pin male plug from the base control board

in the main control box, and connect the wires as follows:

a. Insert and secure the red (+) wire to terminal 1 of

the 3-pin plug.

b. Insert and secure the white (ground) wire to termi-

nal 2 of the 3-pin plug.

c. Insert and secure the black (–) wire to terminal 3 of

the 3-pin plug.

4. Insert the plug into the existing 3-pin mating connector on

the base module in the main control box.

VAV Units with Heat — For variable air volume units that

will use heat, the variable air volume terminals should be

interlocked with the unit at TB5 terminals 1 and 2.
Demand Ventilation — The unit can be equipped with a CO

sensor for use in demand ventilation. This can be factory

supplied and will be mounted in the return duct. It can also be

field supplied and mounted in the return duct or in the space.

Connect the field-installed 4 to 20 mA sensor to TB5 terminal

6 and 7. Do not remove the factory-installed 182-ohm resistor.

If an outdoor air quality sensor is used then it should be

wired to terminal 11 and 12 on TB6. This will require the use

of the optional controls expansion module.
Remote IAQ Override — If the control is being used with non

Carrier building management system it supports the use of the

remote IAQ override switch. This should be connected to

TB6 terminal 13 and 14. Use of this will require the optional

controls expansion module.
Remote Economizer Position Control — The ComfortLink™

controls will normally control the position of the economizer,

but it can also support field control of the economizer position

through a 4 to 20 mA signal. If this is used it should be con-

nected to TB5 terminal 6 and 7. If the signal is a 4 to 20 mA

signal then leave the 182-ohm resistor in place.
Remote Economizer Enable — If the control is being used

with other building management systems and the system will

control the enabling and disabling of the economizer free cool-

ing, this switch input can be connected to TB6 terminals 1 and

2. Note that the controls also support integrated economizer

changeover using outdoor dry bulb, differential dry bulb,

outdoor enthalpy and differential enthalpy.
Remote Occupancy Switch — For interface to other building

management systems the control also supports a switch input

for remote occupancy signals. This wiring should be connected

to terminal TB6 terminal 1 and 3.
Remote Economizer Minimum Position Control — If the

ComfortLink control is controlling the economizer, but a remote

minimum position is required, then an external 100K potentiom-

eter can be connected to TB5 terminal 6 and 7. Remove the

factory-installed 182-ohm resistor.
Smoke Sensor Interface — The ComfortLink control includes

an optional factory-installed return air smoke detector. Remote

alarm circuits can be wired to TB5 terminal 8 and 9.
Fire Shutdown and Smoke Control — The control supports

interface to fire and smoke control systems and allows for the

following system overrides from remote switch inputs.

• Fire Shutdown — Connect to TB6 terminals 8 and 9.

• Smoke Pressurization — Connect to TB6 terminal 12

and 13. This requires the use of the optional controls

expansion module.

• Smoke Evacuation — Connect to TB6 terminal 12 and

14. This requires the use of the optional controls expan-

sion module.

• Smoke Purge — Connect to TB6 terminal 12 and 15.

This requires the use of the optional controls expansion

module.

Demand Limiting — The control can also be used with demand

limiting control from remote building management systems. If a

two stage system is going to be used with Redline Limiting

where the machine is not allowed to increase load and Load Shed

where the load is decreased to a configurable limit in capacity

then these can be connected to TB6 terminals 4 and 5 and 5 and

6. This requires use of the controls expansion module.

MANUFACTURER

CABLE PART NO.

Alpha

2413 or 5463

American

A22503

Belden

8772

Columbia

02525

IMPORTANT: When connecting to CCN communi-

cation bus to system elements, use color coding

system for the entire network to simplify installation

and checkout. See Table 10.

SIGNAL TYPE

CCN BUS CONDUCTOR

INSULATION COLOR

CCN PLUG PIN

NO.

Positive (+)

RED

Ground

WHITE

Negative (–)

BLACK