Alarms - Carrier TruVu VAVB3-E2 Installation And Startup Manual

Alarms

Space Temp Sensor Alarm – The TV-VAVB3-E2 monitors each space temperature sensor and the network input
for space temperature. If no valid space temperature value is available, the controller generates an alarm and
disables all local heating or cooling. The controller modulates the damper to the minimum heat, minimum cool, or
ventilation position based on the air source mode. Normal operation resumes when the controller detects a valid
sensor value.
Space Temperature Alarm – The controller generates an alarm if the space temperature exceeds the alarm
setpoint. The occupied alarm setpoints are determined from the configurable Occupied Alarm Hysteresis (5 °F
[2.8 °C) default) which is subtracted from the configured occupied heat and added to the configured occupied
cool setpoints. If the space temperature rises above or falls below this value and the condition lasts for more than
15 minutes, an alarm is generated. The configurable unoccupied high and low alarm setpoints have a fixed 10
minute alarm delay. When a transition from unoccupied to occupied occurs or the occupied temperature setpoints
are changed, causing an immediate alarm condition, the controller automatically calculates an additional alarm
delay equal to 10 minutes for each degree of change. This additional delay is added to the 15 minute fixed delay
and allows the space temperature to recover and achieve the new setpoints, preventing unnecessary alarms. The
space temperature alarm returns to normal when the space temperature again falls between the current mode's
alarm setpoints.
Supply Air Temperature Alarm – The controller generates an alarm if the SAT exceeds the configured High SAT
Alarm Limit (120°F [48.9°C] default) or falls below the Low SAT Alarm Limit (45°F [7.2°C] default) for more
than 5 minutes. The hysteresis for return to normal is 3 °F (1.7 °C). The High SAT Alarm Limit should be set to
a value at least 15 °F (8.3 °C) above the Maximum Heating SAT or the maximum discharge temperature from
the air source, whichever is greater.
Space Relative Humidity Alarm – If Optional Ctrl Type is set to RH Control (Space Relative Humidity (RH) sensor is
installed), the controller generates an alarm if the sensor's value exceeds the Occ High RH Alarm Limit (100% rh
default) or the Unocc High RH Alarm Limit (100% rh default). The controller provides a 30-minute alarm delay
during unoccupied periods. During occupied periods, the controller uses the Occ High RH Alarm Limit. When a
transition from unoccupied to occupied occurs or the occupied high alarm limit is lowered causing an alarm
condition to occur, the controller automatically calculates an alarm delay equal to 5 minutes for each % RH of
change. This additional delay is added to the 15 minute fixed delay and allows the space relative humidity to
recover and achieve the new setpoints, preventing unnecessary alarms.
Indoor Air Quality Alarm – If Optional Ctrl Type is set to IAQ Control (CO
generates an alarm during occupied periods if the sensor's value exceeds the Occupied High CO2 Alarm Limit.
When a transition from unoccupied to occupied occurs, or if the occupied alarm limit is changed to a value that
causes an alarm condition to occur, the controller automatically calculates an alarm delay equal to 15 seconds for
each ppm of change based on the error from setpoint (15 minutes minimum, 4 hours maximum). This delay
prevents unnecessary alarms and gives the zone time to correct the alarm condition. To disable the IAQ alarm, set
Occupied High CO2 Alarm Limit to 0. The default value is 1100ppm. The hysteresis for return to normal is
100ppm.
Filter Alarm – For series or parallel fan-powered terminals, the controller monitors the accumulated hours of fan
operation and generates an alarm when accumulated hours exceed the configured Filter Service Alarm Timer
limit. The default value is 0 hours which disables the alarm. The alarm can be reset by setting Reset Filter Alarm
to On or resetting the configured alarm limit to 0 hours.
Airside Linkage Alarm – The slave zone controller generates an alarm if it has once been linked successfully to a
master zone and then it fails to receive linkage information for 5 minutes. If the controller is the VVT Master, it
generates an alarm if it does not communicate with its air source for 5 minutes after having been previously
communicating successfully. A return-to-normal is generated after successful Linkage communication resumes. A
power cycle will reset and re-initialize the Airside Linkage Alarm.
The ZS Pro with display has alarm and maintenance indicators. See Alarm Configuration (page 118).
TruVu™ VAVB3-E2
Installation and Start-up Guide
sensor is installed), the controller
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Start-up
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