T301 (Space Temperature Above Limit) — If the space tem-
perature is above the configurable SPT High Alert Limits (occupied [Configuration→ALLM→SP.H.O] for 5 minutes or unoccupied [Configuration→ALLM→SP.H.U] for 10 minutes), then an alert will be broadcast. The alert will automatically reset.
T302 (Supply Temperature Below Limit) — If the
T303 (Supply Temperature Above Limit) — If the supply
temperature is above the configurable SAT HI Alert Limit Occ (Configuration→ALLM→SAH.O) for 5 minutes or the SAT HI Alert Limit/Unocc (Configuration→ALLM→SA.H.U) for 10 minutes, then an alert will be broadcast. The alert will automatically reset.
T304 (Return Air Temperature Below Limit) — If the return-
air temperature measured by the RAT sensor is below the configurable RAT LO Alert Limit/Occ (Configuration→ ALLM→RA.L.O) for 5 minutes or RAT HI Alert Limit/Occ (Configuration→ALLM→RA.L.U) for 10 minutes, then an alert will be broadcast.
T305 (Return Air Temperature Above Limit) — If the return-
air temperature is below the RAT HI Alert Limit/Occ (Config- uration→ALLM→RA.H.O) for 5 minutes or RAT HI
Alert Limit/Occ (Configuration→ALLM→RA.H.U) for
10 minutes, then an alert will be broadcast. The alert will automatically reset.
T308 (Return Air Relative Humidity Below Limit) — If the
unit is configured to use a return air relative humidity sensor through the Return Air RH Sensor (Configuration →UNIT→SENS→RRH.S) setting, and the measured level is below the configurable RH Low Alert Limit (Configuration →ALLM→R.RH.L) for 5 minutes, then the alert will occur. The unit will continue to run and the alert will automatically reset.
T309 (Return Air Relative Humidity Above Limit) — If the
unit is configured to use a return air relative humidity sensor through the Return Air RH Sensor (Configuration →UNIT→SENS→RRH.S) setting, and the measured level is above the configurable RH High Alert Limit (Configuration →ALLM→R.RH.H) for 5 minutes, then the alert will occur. Unit will continue to run and the alert will automatically reset.
T310 (Supply Duct Static Pressure Below Limit) — If the unit
is a VAV unit with a supply duct pressure sensor and the measured supply duct static pressure (Pressures→ AIR.P→SP) is below the configurable SP Low Alert Limit (Configuration→ALLM→SP.L) for 5 minutes, then the alert will occur. The unit will continue to run and the alert will auto- matically reset.
T311 (Supply Duct Static Pressure Above Limit) — If the unit
is a VAV unit with a supply duct pressure sensor and the measured supply duct static pressure (Pressures→ AIR.P→SP) is above the configurable SP Low Alert Limit (Configuration→ALLM→SP.H) for 5 minutes, then the alert will occur. The unit will continue to run and the alert will auto- matically reset.
T312 (Building Static Pressure Below Limit) — If the unit is configured to use a VFD controlled power exhaust or a modu- lating power exhaust then a building static pressure limit can be configured using the BP Low Alert Limit (Configuration →ALLM→BP.L). If the measured pressure (Pres- sures→AIR.P→BP) is below the limit for 5 minutes then the alert will occur.
T313 (Building Static Pressure Above Limit) — If the unit is
configured to use a VFD controlled power exhaust or a modu- lating power exhaust then a building static pressure limit can be
configured using the BP HI Alert Limit (Configuration
→ALLM→BP.H). If the measured pressure (Pressures→AIR.P→BP) is above the limit for 5 minutes, then the alert will occur.
T314 (IAQ Above Limit) — If the unit is configured to use an CO2 sensor and the level (Inputs→AIR.Q→IAQ) is above the configurable IAQ High Alert Limit (Configuration→ ALLM→IAQ.H) for 5 minutes then the alert will occur. The unit will continue to run and the alert will automatically reset.
A404 (Fire Shutdown Emergency Mode) — This alarm occurs when the fire shutdown input is active (either open or closed depending upon its configuration). If the fire shutdown input is energized (fire shutdown is in effect), or if two fire smoke modes are incorrectly energized at the same time, a fire shut- down mode will occur. This is an emergency mode requiring the complete shutdown of the unit. Recovery is automatic when the inputs are no longer on.
This alarm is usually caused by an auxiliary device that is trying to shut down the unit (e.g., smoke detector). The input for Fire Shutdown is at Inputs→FIRE→FSD. The switch logic configuration for this switch input can be found at variable Configuration→SW.LG→FSD.L. Verify that the configuration is set correctly, verify the wiring and auxiliary device. This alarm resets automatically.
A405 (Evacuation Emergency Mode) — Unit has been placed in the fire evacuation mode by means of the external command for evacuation (Inputs→FIRE→EVAC).
If the evacuation input on the CEM is energized, an evacua- tion mode occurs which flags an alarm. This mode attempts to lower the pressure of the space to prevent smoke from moving into another space. This is the reverse of the Pressurization mode. Closing the economizer, opening the
A406 (Pressurization Emergency Mode) — Unit has been placed in the fire pressurization mode by means of the External command for pressurization (Inputs→FIRE→PRES).
If the pressurization input on the CEM is energized, a pres- surization mode occurs which flags an alarm. This mode attempts to raise the pressure of a space to prevent smoke infiltration from another space. The space with smoke should be in an Evacuation mode attempting to lower its pressure. Opening the economizer, closing the
A407 (Smoke Purge Emergency Mode) — Unit has been placed in the fire pressurization mode by means of the external command for pressurization (Inputs→FIRE→PURG).
If the smoke purge input on the CEM is energized, a smoke purge mode occurs which flags an alarm. This mode attempts to draw out smoke from the space after the emergency condi- tion. Opening the economizer, closing the
T408 (Dirty Air Filter) — If no dirty filter switch is installed, the switch will read “clean filter” all the time. Therefore the dirty filter routine runs continuously and diagnoses the input. Because of the different possible times it takes to generate static pressure, this routine waits 2 minutes after the fan starts before the dirty filter switch is monitored. If the dirty filter switch reads “dirty filter” for 2 continuous minutes, an alert is generated. No system action is taken. This is a reminder that it is time to change the filters in the unit. Recovery from this alert is through a clearing of all alarms (manual) or after the dirty filter switch reads clean for 30 continuous seconds (automatic).
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