Carrier 33ZCSECTRM Spezifikationen PDF herunterladen (Seite 15)

minute. If a zone fails to receive updates from the linkage mas-

ter for 5 sequential times (greater than 5 minutes without suc-

cessful communications), then a Linkage Failure communica-

tion alarm is generated. The alarm is generated from the zone

that indicated loss of communication with Linkage Master. To

determine when communications have returned to normal, the

controller will continue to monitor the communication status.

After 5 sequential successful communications, then a return to

normal message is generated, although normal operation will

resume after the first successful communication.

Linkage Failure (Failure to Communicate with

Air Source) —

If a zone controller has been configured as

the linkage master, and an air source address has been config-

ured to a value other than the default, then the linkage master

zone controller will exchange information with the configured

air source once each minute. The air source must be Linkage

compatible.

If the air source fails to respond, then the linkage master will

attempt to retry communication. If unsuccessful, the linkage

master will log the attempt as a failure. If 5 sequential failures

occur (more than 5 minutes without successful communica-

tion), then a Linkage Failure communication alarm is generat-

ed for the air source. The alarm indicates a Linkage Air Source

Failure at address X, X (where X, X is the failed air source ad-

dress). To determine when communications have returned to

normal, the controller will continue to monitor the communica-

tion status. After 5 sequential successful communications oc-

cur, a return to normal message is generated.

Supply Air Temperature Sensor Failure —

For any

zone where ducted heat is configured, if the supply air tempera-

ture sensor fails then a Supply Air Temperature Sensor Failure

alarm for that zone is generated. The zone controller will wait

2 minutes before generating the alarm. A return to normal (or

reset of the time delay) occurs immediately upon the detection

of a normal temperature or if the ducted heat is configured

to No.

Primary Air Temperature Sensor Failure

—

For

any linkage master where the air source address is NOT con-

figured (default value), if the primary air temperature sensor

fails then a Primary Air Temperature Sensor Failure alarm is

generated. The alarm is generated after a 2 minute delay. A re-

turn to normal (or reset of the time delay) occurs immediately

upon the detection of a normal temperature or if an air source

address is configured.

Pressure Sensor Low Airflow Pressure

Alarm

—

Any time the value of the input channel voltage

falls below a minimum acceptable value (0.89 V), then a Low

Airflow Pressure alarm will be generated for that zone. For all

control types except Dual Duct or Room Pressure Control, the

alarm indicates an Airflow Sensor Low Pressure alarm.

For Dual Duct and Zone Pressure Control applications, both

primary airflow and secondary airflow sensors are monitored

for this condition. The appropriate alarm message is generated,

based upon the sensor failure detected.

To determine when normal conditions have returned, the

zone controller will continue to monitor the input. When the

voltage rises to within tolerance (above 0.91 V), a return to nor-

mal message is generated.

NOTE: A value of 0.89 volts is the minimum acceptable 0 in.

wg value.

Pressure Sensor High Velocity Pressure

Alarm —

Any time the calculated value of the measured ve-

locity pressure exceeds the configured maximum value for

more than 5 minutes, then a High Velocity Pressure alarm is

generated for that zone. The range is 0.250 in. wg to 2.000 in.

wg. The default is 1.200 in. wg. For Dual Duct and Room

Pressure Control applications, both primary airflow and sec-

ondary airflow sensors are monitored for this condition. The

appropriate alarm message is generated, based upon the appro-

priate sensor measurement.

The zone controller will continue to monitor the input, and

when the pressure falls below the alarm limit minus 0.1 in. wg,

a return to normal message is generated.

Relative Humidity Sensor Alarm

—

If the control-

ler is configured for Relative Humidity control and the value of

the sensor exceeds the Relative Humidity High alarm limit or

falls below the Relative Humidity Low alarm limit during oc-

cupied periods, then an alarm is generated. The condition must

exceed the alarm limit for 5 minutes before the zone controller

will issue the alarm.

The alarm will be generated only if Humidity Control is En-

abled. A delay is applied whenever the control transitions to an

occupied mode or if the control set point is changed in order to

prevent false alarms. The delay is similar to the Space Temper-

ature Alarm Limit Delay. The low Relative Humidity alarm

has a configurable range from 0% to 100% and a default of

20%. The high Relative Humidity alarm has a configuration

range from 0% to 100% and a default of 70%. A fixed hystere-

sis of 2% is used to determine when the conditions have re-

turned to normal. Alarms can be generated during occupied

and unoccupied times.

AQ Sensor Alarm

—

If the zone controller is config-

ured for IAQ control and the value of the sensor exceeds the

IAQ High Alarm Limit or falls below the IAQ Low Alarm

Limit during occupied periods, then an alarm is generated. The

alarm condition has a delay of 5 minutes before the alarm to be

generated.

The alarm is generated only if the IAQ control is Enabled.

A 2-hour delay is applied whenever the zone controller transi-

tions to an occupied mode, in order to prevent false alarms. The

low IAQ alarm limit has a configuration range of 0 to 5000

(ppm) with a default of 0. The high IAQ alarm limit has a con-

figuration range of 0 to 5000 (ppm) with a default of 2000. For

flexibility, the limits for the IAQ alarm do not include units, but

the IAQ sensor alarm descriptions (24-character text) include

the default units (‘PPM’) as part of the description.

To determine when normal conditions have returned, the

zone controller will apply a 2% hysteresis to the alarm limits,

and generate a return to normal message when the sensor re-

turns within range (2% of the alarm limit value).

Failure to Zero Calibrate Pressure Trans-

ducer

—

During the zero calibration procedure, if the air-

flow pressure input voltage fails to decrease to within the al-

lowable zero pressure range, the zone controller will generate a

Failure to Zero Calibrate Pressure Transducer alarm.

Damper Position and Actuator Installation

—

During the damper calibration procedure of the Commission-

ing Mode or during the zero calibration, after the damper is

driven closed, the control will generate a Damper Actuator

Failure to Close alarm if the corresponding damper position is

not within the specified closed position range. The acceptable

input voltage range is above 8.5 VDC for clockwise open and

below 1.5 VDC for counterclockwise open. The damper posi-

tion sensor has a 0 to 10 range.

CCN USER INTERFACE

The Points Display Table, Set Point Table, and Linkage

Maintenance Table are shown to inform a user of what infor-

mation is available to be accessed via CCN user interface,

BEST++, DataPort, DataLink and BacLink Gateway. See

Tables 7-9.

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