This block outputs alarms of terminal unit with reheat. The implementation is according to the Section 5.6.6 of ASHRAE Guideline 36, May 2020.
staTim
,
if the measured airflow VDis_flow
is less than 70% of setpoint
VActSet_flow
for 5 minutes (lowFloTim
) while the setpoint
is greater than zero, generate a Level 3 alarm.
staTim
,
if the measured airflow VDis_flow
is less than 50% of setpoint
VActSet_flow
for 5 minutes (lowFloTim
) while the setpoint
is greater than zero, generate a Level 2 alarm.
staPreMul
) of 0 for its
static pressure reset Trim-Respond control loop, low airflow alarms shall be
suppressed for that zone.
u1HotPla=true
), and the
discharge temperature (TDis
) is 8 °C (15 °F) less than the
setpoint (TDisSet
) for 10 minuts (lowTemTim
), generate a
Level 3 alarm.
u1HotPla=true
), and the
discharge temperature (TDis
) is 17 °C (30 °F) less than the
setpoint (TDisSet
) for 10 minuts (lowTemTim
), generate a
Level 2 alarm.
hotWatRes
) of 0 for its
hot-water reset Trim-Respond control loop, low discharing air temperature alarms
shall be suppressed for that zone.
If the fan serving the zone has been OFF (u1Fan=false
) for 10 minutes
(fanOffTim
), and airflow sensor reading VDis_flow
is above 10% of the cooling maximum airflow setpoint VCooMax_flow
,
generate a Level 3 alarm.
If the damper position (uDam
) is 0% and airflow sensor reading
VDis_flow
is above 10% of the cooling maximum airflow setpoint
VCooMax_flow
for 10 minutes (leaFloTim
) while the
fan serving the zone is proven on (u1Fan=true
), generate a Level
4 alarm.
If the valve position (uVal
) is 0% for 15 minutes (valCloTim
),
discharing air temperature TDis
is above AHU supply temperature
TSup
by 3 °C (5 °F), and the fan serving the zone is proven
on (u1Fan=true
), gemerate a Level 4 alarm.
Logical.And3
based on ASHRAE 231P,
replaced it with a stack of two Logical.And
blocks.
This is for
#2465.
staTim
to allow the system becoming stabilized.
This is for issue 3257.