Carrier 40UV Installation, Start-Up And Service Instructions Manual page 32

WIRING THE SPACE TEMPERATURE SENSOR AND
SET POINT ADJUSTMENT — To wire the sensor and
slidebar, perform the following (see Fig. 18):
1. Identify which cable is intended for sensor wiring.
2. Strip back the jacket from the cables at least 3 inches.
1
Strip / -in. of insulation from each conductor. Cut the
4
shield and drain wire from the sensor end of the cable.
3. Connect the sensor cable as follows:
a. Install a jumper between the two center terminals
(SEN and SET).
b. Remove the existing factory-connected wire on
terminal T1 of the control module.
c. Connect one wire from the cable (RED) to the T1
terminal on the controller. Connect the other end
of the wire to the SEN terminal without the
jumper wire.
d. Connect another wire from the cable (BLACK) to
the T10 terminal on the controller. Connect the
other end of the wire to the remaining jumpered
SEN terminal.
e. Connect the remaining wire (WHITE/CLR) to the
T9 terminal on the controller. Connect the other
end if the wire to the remaining open terminal on
the SET terminal block.
f. In the control box, install a no. 6 ring type crimp
lug on the shield drain wire. Install this lug under
the mounting screw in the upper right corner of
the controller (just above terminal T1).
WIRING THE CCN NETWORK COMMUNICATION
SERVICE JACK — To wire the service jack, perform the
following:
1. Strip back the jacket from the CCN communication ca-
ble(s) for at least 3 inches. Strip
each conductor. Remove the shield and separate the drain
wire from the cable. Twist together all the shield drain
wires and fasten them together using a closed end crimp
lug or a wire nut. Tape off any exposed bare wire to pre-
vent shorting.
2. Connect the CCN + signal wire(s) (RED) to Terminal 5.
3. Connect the CCN – signal wire(s) (BLACK) to Ter-
minal 2.
4. Connect the CCN GND signal wire(s) (WHITE/CLR) to
Terminal 4. Before wiring the RJ11 plug refer to Carrier
Comfort Network® Interface, page 38 for communica-
tion bus wiring and cable selection. The cable selected
must be identical to the CCN communication bus wire
used for the entire network.
The other end of the communication bus cable must be
connected to the remainder of the CCN communica-
tion bus. If the cable is installed as a T-tap into the bus,
the cable length cannot exceed 100 ft. Wire the CCN
service jack of the sensor in a daisy chain arrangement
with other equipment. Refer to Carrier Comfort
Network Interface section, page 38 for more details.
LINKAGE THERMOSTAT (Field-Installed Accessory) —
The linkage thermostat can be used to control multiple units
(up to 8 different sizes and types) from a single thermostat,
provide occupancy scheduling for any number of units (all
operating on the same schedule), and broadcast the changeover
1
/ -in. of insulation from
4
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switch status (2-pipe systems) to all units in the system
(Fig. 19). The thermostat is equipped with two liquid crystal
displays (LCD). One LCD is used to display the set points,
space temperature, unit operating mode (Heating, Cooling, Off,
etc.), and discharge air temperature from the unit. The second
LCD displays the time and day of the week. The thermostat has
pushbutton keys to enter the temperature set points, program
the occupancy schedule, program holidays, set time, day, and
date, and configure the functionality of the device.
When the thermostat provides local occupancy and set point
scheduling for these units, it provides a Temperature Compen-
sated Start feature which starts the unit(s) prior to the scheduled
occupied time in order for the space to achieve the occupied set
point temperature at the occupied time.
The thermostat uses CCN communications to provide the
required information exchange between the thermostat and the
unit's controls.
The thermostat can be used to provide global occupancy
scheduling for any number of units when a CCN user interface
is not provided. In this mode, a 3-wire communication bus
connected between each unit and the thermostat allows a user
to program and change equipment occupancy scheduling and
holidays from a single location without requiring the use of a
personal computer. This allows any number of unit ventilators
equipped with the Unit Ventilator Comfort Control module to
operate to a common occupancy schedule (all controllers must
be connected to a single CCN communication bus). Each Unit
Ventilator Comfort Control module will use its own set points
and space temperature settings.
The linkage thermostat can broadcast the value of an equip-
ment status point to all units connected to the communication
bus. The point name must be configured using a CCN Service
Tool at installation. A typical example is to broadcast the status
of the changeover switch (2-pipe systems) or a field-supplied
and field-installed outdoor-air enthalpy sensor from the one
unit where the sensor is installed to all other units. This action
reduces the installation cost and operating maintenance of the
entire system.
When used to provide Global Occupancy Scheduling or
Broadcast, the thermostat does NOT need to be mounted in any
specific space. The thermostat can be mounted anywhere in a
conditioned area as long it is connected to the CCN communi-
cation bus.
The linkage feature allows several units to operate from a
single common thermostat. This feature can be used if multiple
units serve a single common area. The thermostat must be
mounted in the common area space for this feature.
Thermostat Mounting Location — DO NOT mount the sen-
sor in drafty locations (such as near air conditioning or heating
ducts), over heat sources (such as baseboard heaters or radia-
tors), or directly above wall mounted-lighting dimmers. DO
NOT mount the sensor near a window which may be opened,
near a wall corner, or near a door.
Sensors mounted in these areas will have inaccurate and
erratic sensor readings. The sensor should be mounted approxi-
mately 5 ft from the floor, in an area representing the average
temperature in the space. Allow at least 4 ft between the sensor
and any corner and mount the sensor at least 2 ft from an open
doorway. Follow the mounting and wiring instructions includ-
ed with the thermostat for proper thermostat installation.