Carrier 33ZCSECTRM Spezifikationen PDF herunterladen (Seite 13)

The schedule master broadcasts its occupancy status upon

transition and every 15 minutes, whenever it is configured as a

global schedule (schedule number 65 to 99).

All the controllers on any CCN bus that are using the same

global schedule need to be configured for the same schedule

number.

Remote Occupancy Contact —

The remote occu-

pancy contact can be used to provide a room occupancy sensor

input to the zone controller. If the remote occupancy contact in-

put is in the off position the zone controller will transition to

unoccupied. If the remote contact input is in the on position the

zone controller will follow its local occupancy schedule.

Occupancy Override —

The occupancy function will

support a timed override function. The timed override will be

activated through the space temperature sensor override button.

If the override is activated in a zone that is receiving a global

time schedule, then the override will be reported to the device

issuing the global schedule. The device will then update the oc-

cupancy status of the zones receiving the schedule.

NOTE: All zones sharing a global occupancy schedule will be

overridden to the occupied mode if any one of the space tem-

perature sensors report an override. For zones that require indi-

vidual overrides, those zones will have to use a local schedule.

Manual Occupancy Override Function —

By us-

ing a CCN user interface, the user is able to command a timed

override by entering the number of hours of override hours (0

to 4 hours). A manual entry greater than 0 will bring the zone

controller schedule into the occupancy mode. This function is

defined as manual override.

If the occupancy schedule is occupied when the manual

override is downloaded, the current occupancy period will be

extended by the number of hours downloaded. If the current

occupancy period is unoccupied when the occupancy override

is initiated, the mode will change to occupied for the duration

of the number of hours downloaded.

If the occupancy override is due to end after the start of the

next occupancy period, the mode will transition from occupan-

cy override to occupied without becoming unoccupied, and the

occupancy override timer will be reset.

An active manual occupancy override or a pending occu-

pancy override may be canceled by downloading a zero to this

configuration. Once a number other than zero has been down-

loaded to this configuration, any subsequent downloads of any

value other than zero will be ignored by the zone controller.

Once the override period has expired, the value is reset to 0

and the manual override function is complete. If the override is

activated in a zone utilizing local occupancy scheduling, then

only that zone is affected. The override will occur for the time

configured for that device.

Occupancy Table Format —

The occupancy table is

common to both a local and global occupancy function. For

flexibility of scheduling the occupancy programming is split

into eight separate periods. The configuration consists of eight

fields corresponding to the seven days of the week and a holi-

day field in the following order: Monday, Tuesday, Wednesday,

Thursday, Friday, Saturday Sunday, Holiday. The occupancy

time is configured in hour and minutes in military time.

The format of the schedule and the calculations performed

on the schedule data is shown in Fig. 5.

Optimal Start Operation —

For local occupancy, the

occupancy function will factor in the occupancy bias time sup-

plied by the linkage function. This bias time will cause the oc-

cupancy period to start earlier by the amount indicated by the

bias time. The occupancy function will provide information so

that the rest of the zone controller functions can differentiate

between biased occupied periods and configured occupied

periods.

The Start Bias Time (in minutes) is calculated by the air

source as needed to bring the temperature up or down to meet

the set point under the optimal start routine. This value will be

sent to all associated zones for optimal start of zone controllers.

SYSTEM OVERRIDE MODES

The system will react to four override modes reported by

the air source compatible with linkage: pressurization, evacua-

tion, nighttime free cooling (NTFC), and morning warm up.

Pressurization —

In Pessurization mode, the system will

bring in as much outside air as possible in order to pressurize the

area. This mode is used for smoke control and prevents smoke

from entering into an area that is adjacent to an area of smoke.

Each zone controller will modulate its damper to provide

maximum cooling airflow into the space. If the terminal con-

tains a series fan, the fan will be turned on. If the terminal con-

tains a parallel fan it will be turned off. If the terminal contains

auxiliary heat, the heating will be controlled so as to maintain

the current heating set point. Secondary dampers in a zone

pressurization application will closed.

Evacuation —

In Evacuation mode, the system will at-

tempt to remove smoke from an area by creating a negative

pressure. Either a return air fan in the air source, or some other

fan mechanism will be used to exhaust the smoke filled return

air from the space. The terminals will respond by closing their

dampers and turning off all fans. Secondary dampers in a zone

pressurization application will open.

Night Time Free Cooling (NTFC) —

In NTFC mode,

the system is attempting to use cool night time (3 AM to 7 AM)

outside air to cool down the space. In this mode, the air source

will operate its fan and mixed air dampers to provide outside

air to the system. The air terminals will act as if they are in the

Occupied Cooling mode except that the temperature control set

point will be the midpoint between the occupied cooling and

heating set points rather than the occupied cooling set point.

Morning Warm-Up —

In Morning Warm-up mode, the

air source provides central heating. Morning warm-up will run

once per day and will start at the time indicated by the earliest

occupied zone (biased by the optimal start calculation). If VAV

central heating is enabled, then the zone controller will modu-

late air flow between the minimum and maximum heating cfm

limits to achieve its occupied heating set point.

SET POINT GROUPING

Each zone controller will contain a set point schedule. This

schedule will contain temperature, humidity, and air quality set

points. The set point data may be unique to the zone controller

or multiple zone controllers may be grouped together to share

the same temperature set points.

The controller contains a Set Point Group Number configu-

ration parameter and a Set Point Group Master configuration

parameter. When a zone controller is configured as Set Point

Master, the zone controller will broadcast its set points to other

zone controllers that are configured to accept the Broadcast Set

Point Schedule. If a zone controller is not configured to use

global set points, the zone controller will use its own onboard

set point schedule. The Set Point Master is independent of the

Master Linkage zone controller. There can be 16 Set Point

Group functions per CCN bus. Global set points will not be

transmitted through CCN bridges.

SPACE TEMPERATURE SHARING

Each zone controller has the capability to share its local sen-

sor and temperature offset with other zone controllers. Each

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