Alarm Configuration - Carrier VAV Zone II Installation And Startup Manual

Appendix A: VAV Zone II Points/Properties

Alarm Configuration

Navigation: i-Vu® / Field Assistant:
Point Name/Description
Space Temperature Alarm
Occupied Alarm Hysteresis – This value is added to the effective cooling setpoints and
subtracted from the effective heating setpoints as output from the Setpoint microblock.
These values establish the occupied high and low limits that the space temperature
must exceed before an occupied SPT alarm is generated. The alarm returns to normal
when the space temperature drops below the high effective setpoint or rises above the
low effective setpoint.
Alarm Delay (min/deg) – Determines the amount of delay before an occupied space
temperature alarm is generated when the controller transitions to the occupied mode.
The delay time equals this value multiplied by the difference between the sensor
temperature and occupied alarm setpoint plus 15 minutes.
Unoccupied Low SPT Alarm Limit –The value that the space temperature must drop
below to generate a Space Temperature Alarm in the unoccupied mode. There is a
fixed hysteresis of 1 °F (.5 °C) for return to normal.
Unoccupied High SPT Alarm Limit – The value that the space temperature must exceed
to generate a Space Temperature Alarm in the unoccupied mode. There is a fixed
hysteresis of 1 °F (.5 °C) for return to normal.
Supply Air Temperature Alarm
Low SAT Alarm Limit – The value that the supply air temperature must drop below to
generate a Supply Air Temp Alarm. There is a fixed hysteresis of 3 °F (1.6 °C) for
return to normal.
High SAT Alarm Limit – The value that the supply air temperature must exceed to
generate a Supply Air Temp Alarm. There is a fixed hysteresis of 3 °F (1.6 °C) for
return to normal. This should be set at least 15 °F (8.3 °C) higher than the
Maximum Heating SAT.
Space Humidity Alarm
Occupied High RH Alarm Limit – The value that the relative humidity sensor must
exceed to generate a Space Humidity Alarm in the occupied mode if RH Control is set
to Enable. There is a fixed hysteresis of 5%rh for return to normal.
Alarm Delay (min/%RH) – Determines the amount of delay before an occupied RH
alarm is generated when the controller transitions to the occupied mode. The delay time
equals this value multiplied by the difference between the sensor RH value and the
occupied RH setpoint plus 15 minutes.
Unocc High RH Alarm Limit – The value that the relative humidity sensor must exceed
to generate a Space Humidity Alarm in the unoccupied mode if RH Control is set to
Enable. There is a fixed hysteresis of 5%rh for return to normal.
VAV Zone II Controllers
Installation and Start-up Guide
Properties Control Program
>
80
Configuration Alarm Configuration
> >
Default/Range
D: 5 °F (2.7 °C)
R: 0 to 20 °F
(0 to 11.1 °C)
D: 10 minutes
R: 0 to 30 minutes
D: 45°F (7.2°C)
R: 35 to 90°F
(1.6 to 32.2°C)
D: 95°F (35°C)
R: 45 to 100°F
(7.2 to 37.7°C)
D: 45°F (7.2°C)
R: 15 to 90°F
(-9.4 to 32.2°C)
D: 120°F (48.9°C)
R: 90 to 175°F
(32.2 to 79.4°C)
D: 100%rh
R: 45 to 100%rh
D: 5 minutes
R: 0 to 30 minutes
D: 100%rh
R: 45 to 100%rh
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