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Optimal Start Routine — The following TSM points are used
in the optimal start portion of the rooftop unit PIC adaptive op-
timal start/stop routine (AOSS): AZT, NEXTOCCT, NEX-
TOCCD, PREVUNOT, and PREVUNOD from the TSM. The
rooftop PIC uses this information to calculate a bias time that is
then used by both the rooftop PIC and the TSM. When the cur-
rent time of day is greater than the biased start time, the rooftop
PIC uses the AOZT from the TSM to determine when the oc-
cupied set point has been achieved.
Unoccupied Free Cooling — When the unoccupied free cool-
ing is configured, the rooftop PIC uses the AZT from the TSM
instead of the space temperature to determine if unoccupied
free cooling should operate.
Supply-Air Set Point (SASP) — When supply-air set point
reset from space temperature is configured, the rooftop unit
PIC uses the AOZT and the AOCS from the TSM instead of
the space temperature to determine the amount of reset
required.
Linkage Alarms — If the rooftop unit PIC which had previ-
ously been operating as part of a DAV system detects a com-
munication failure between the rooftop unit and the TSM, the
rooftop unit PIC continues to operate for 5 minutes using the
last information it received from the TSM. If communication
resumes within the 5-minute period, normal system operation
continues. If the communication failure persists beyond 5 min-
utes, the rooftop unit PIC generates a linkage failure alarm. At
that time, the rooftop unit PIC will return to stand-alone opera-
tion using its own sensors and set points.
If the internal occupancy schedule for the rooftop unit PIC
has not been configured, the controls will maintain the same
occupancy state as prior to the linkage failure. If the occupancy
schedule is configured on the rooftop unit PIC, the controls will
maintain the same occupancy state as prior to the linkage fail-
ure until the next scheduled occupancy transition. At that time,
the rooftop unit PIC will revert to its own internal occupancy
schedule.
If communication is restored, normal DAV system opera-
tion resumes, and the rooftop unit PIC generates a linkage
return-to-normal message.
INSTALLATION INFORMATION
Control Wiring —
See Fig. 14-29 for connections to unit.
The recommended types of control wiring for unit devices are
listed in Table 43.
SENSORS — Sensors should be wired using single twisted
pairs of 20 AWG (American Wire Gage) conductor cable rated
for the application, except for the T-56 accessory sensor which
requires 3-conductor cable.
NOTE: Humidity and CO
2
from an isolated 24-v power supply.
HUMIDITY CONTROL AND HOT WATER AND
STEAM VALVES — These devices require 20 AWG twisted
pair conductor cables rated for the application for the 4 to
20 mA signal.
SPACE
TEMPERATURE
CEC0121448-01) — The space temperature sensor is shipped
standard with every unit, and is located in the main control box.
Space temperature sensor wires are to be connected to termi-
nals in the unit main control box. The space temperature sensor
includes a terminal block (TB1), a jumper between pins E2 and
E3, and an RJ11 female connector. The RJ11 connector is used
to tap into the Carrier Comfort Network (CCN) at the sensor.
See RJ11 Plug Wiring section on page 43 to connect the RJ11
connector to the CCN.
sensors must each be powered
SENSOR
(T-55
and
Jumper MUST be in place between pins E2 and E3 or
inaccurate readings could result.
To connect the space temperature sensor (Fig. 14):
1. Connect 1 wire of the twisted pair to terminal T1 and
connect the other wire to terminal T2 on terminal
block 1 (TB1) located on the cover of the space tem-
perature sensor using a 20 AWG twisted pair conduc-
tor cable rated for the application.
2. Connect the other ends of the wires to terminals 1 and
3 on TB3 (sizes 034-048) or terminals 1 and 2 on TB2
(sizes 054-104), located in the unit main control box.
NOTE: This sensor should be installed for all applications. For
VAV applications, it is used to control heating and cooling dur-
ing unoccupied periods. For DAV applications, it is used to
maintain control of the space during linkage failures with the
TSM (terminal system manager).
SPACE
TEMPERATURE
CEC0121503-01) (CV Applications Only) — Space temper-
ature sensor wires are to be connected to terminals in the unit
main control box. The space temperature sensor includes a ter-
minal block (TB1), a jumper between pins E2 and E3, and an
RJ11 female connector. The RJ11 connector is used to tap into
the CCN at the sensor. See RJ11 Plug Wiring section on page
43 to connect the RJ11 connector to the CCN.
Jumper MUST be in place between pins E2 and E3 or
inaccurate readings could result.
To connect the space temperature sensor (Fig. 14):
1. Connect 1 wire of the 3-conductor cable to terminal
TH, 1 wire to terminal COM, and the other wire to ter-
minal SW on terminal block 1 (TB1) located on the
cover of the space temperature sensor using a 20 AWG
twisted 3-conductor cable rated for the application.
2. Connect the other ends of the wires to terminals 1, 3,
and 7 on TB3 (sizes 034-048) or terminals 1, 2, and 7
on TB2 (sizes 054-104), located in the unit main con-
trol box. The wire from terminal SW MUST be con-
nected to terminal 7 for all sizes.
NOTE: Either the T-55 or the T-56 sensor must be connected
for CV applications to function.
Table 43 — Recommended Sensor and
Device Non-Shielded Cable
MANUFACTURER
Alpha
American
Belden
Columbia
Manhattan
Quabik
Smoke Control —
base unit control to provide space smoke control in response to
discrete input signals from a building fire alarm system. Each
mode must be energized individually from the approved
34
SENSOR
(T-56
PART NO.
Regular Wiring
Plenum Wiring
1895
—
A21451
A48301
8205
884421
D6451
—
M13402
M64430
6130
—
Four functions are provided by the
and
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Table of Contents
Troubleshooting
