Appendix A: VAV Zone Controller Points/Properties
Alarm Configuration
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ALARMS
Point Name/Description
Default/Range
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.
D:
R:
5∆°F (2.7∆°C)
0 to 20∆°F
(0 to 11.1∆°C)
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.
D:
R:
10 minutes
0 to 30 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.
D:
R:
45°F (7.2°C)
35 to 90°F
(1.6 to 32.2°C)
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.
D:
R:
95°F (35°C)
45 to 100°F
(7.2 to 37.7°C)
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 1∆°F (.5∆°C) for return
to normal.
D:
R:
45°F (7.2°C)
15 to 90°F
(-9.4 to 32.2°C)
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 1∆°F (.5∆°C) for return
to normal.
D:
R:
120°F (48.9°C)
90 to 175°F
(32.2 to 79.4°C)
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.
D:
R:
100%rh
45 to 100%rh
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.
D:
R:
5 minutes
0 to 30 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.
D:
R:
100%rh
45 to 100%rh
IAQ/Ventilation Alarm
60
VAV Zone Controllers