Specifications

ManualsBrandsCarrier ManualsFan50JB034

Conﬁguration — To conﬁgure:

1. Enable Demand Limit. Press to enter the sub-

function. Scroll down to DLEN. Press to

ENTER

enable.

2. Select Loadshed Groups. Press to enter

the subfunction. Scroll down to LSGP. Coordinate Group

selection with CCN Loadshed Module equipment sched-

ules. Default is group 1. Range is 1 to 16.

3. Specify Demand Limit Set Point. Press to enter

the subfunction. Scroll down to LSP. The default is 50%.

The range is 0 to 100 %.

DIGITAL AIR VOLUME (DAV) — Carrier rooftop units

with PIC may also have a communication linkage with the

VAV terminal units in a particular application. This linkage

is called the DAV linkage. The DAV mode indicates the unit

is being controlled through a CCN network and is connected

to DAV system. Digital Air Volume (DAV) is Mode 39. The

CCN Building Supervisor system is required. The CCN must

be connected to PSIO1, COMM1 port.

Linkage Data and Operation — The values from the Termi-

nal System Manager (TSM) which are used as linkage data

by the rooftop PIC control are found in Table 39.

Table 39 — TSM Linkage Codes

ITEM DEFINITION

AOCS Average Occupied Cool Set Point

AOHS Average Occupied Heat Set Point

AOZT Average Occupied Zone Temperature

AUCS Average Unoccupied Cool Set Point

AUHS Average Unoccupied Heat Set Point

AZT Average Zone Temperature

NEXTOCCD Next Occupied Day

NEXTOCCT Next Occupied Time

NEXTUNOD Next Unoccupied Day

NEXTUNOT Next Unoccupied Time

OCCSTAT Occupancy Status

PREVUNOD Previous Unoccupied Day

PREVUNOT Previous Unoccupied Time

Cooling/Heating Routines — When the rooftop unit PIC is

part of a DAV system, the rooftop unit PIC utilizes infor-

mation supplied by the TSM to control cooling, heating, and

economizer routines instead of using its own return air and

space temperature sensors. The AOHS, AOCS, AUHS, and

AUCS from the TSM are used instead of the rooftop unit

PIC conﬁgured set points. The rooftop unit uses the occu-

pancy status information through the communication link-

age, such as NEXTOCCT and NEXTUNOT, instead of its

internal occupancy schedule.

VAV Systems — During occupied and biased occupied pe-

riods on VAV systems, the rooftop unit PIC uses the AOZT

from the TSM to replace the rooftop unit PIC return-air tem-

perature sensor value. During unoccupied periods, the roof-

top unit PIC uses the AZT from the TSM instead of the roof-

top unit PIC space temperature and return-air temperature

sensor values.

Optimal Start Routine — The following TSM points are used

in the optimal start portion of the rooftop unit PIC adaptive

optimal 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 current time of day is greater than the biased start time,

the rooftop PIC uses the AOZT from the TSM to determine

when the occupied 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 un-

occupied free cooling should operate.

Supply-Air Set Point (SASP) — When Space Temperature

(SASP) reset is conﬁgured, the rooftop unit PIC uses theAOZT

and the AOCS from the TSM instead of the space tempera-

ture to determine the amount of reset required.

Linkage Alarms — If the rooftop unit PIC which had pre-

viously been operating as part of a DAV system detects a

communication 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 commu-

nication resumes within the 5-minute period, normal system

operation continues. If the communication failure persists be-

yond 5 minutes, the rooftop unit PIC generates a linkage fail-

ure alarm. At that time, the rooftop unit PIC will return to

stand-alone operation 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 occu-

pancy schedule is conﬁgured on the rooftop unit PIC, the

controls will maintain the same occupancy state as prior to

the linkage failure until the next scheduled occupancy tran-

sition. 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.