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Appendix A: RTU Open Points/Properties in i-Vu®/Field Assistant
Alarm Configuration
Navigation:
i-Vu® / Field Assistant:
Point Name/Description
Space Temperature Alarm
Occupied Alarm Hysteresis – This value is added to the occupied high effective setpoint
and subtracted from the occupied low effective setpoint to 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 5 °F (2.7 °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 5 °F (2.7 °C) for
return to normal.
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.
Unoccupied High RH Alarm Limit – The value that the relative humidity sensor must
exceed to generate a Space Relative 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.
RTU Open v3
Installation and Start-up Guide
Properties
Control Program
>
76
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 60 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:
38°F (3.3°C)
R:
15 to 90°F
(-9.4 to 32.2°C)
D:
160°F (71.1°C)
R:
90 to 175°F
(32.2 to 79.4°C)
D:
70%rh
R:
0 to 100%rh
D:
5 minutes
R:
0 to 30 minutes
D:
100%rh
R:
0 to 100%rh
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