Specifications

84
Alert Code 177 (4-20 mA Demand Limit Failure)
— This
alert indicates a problem with the optional remote 4 to 20 mA
demand limit signal (DM.AI) that is connected to the CEM
module. If this occurs, then demand limiting will be disabled.
The unit must be configured for 4 to 20 mA Demand Limiting
using the Demand Limit Select (DMLS).
Alarm Code 200 (Linkage Timeout Error — Loss of Com-
munications) — An error has occurred with communications
between boards. Check wiring and reset controls.
Alert Code 210 (Building Pressure Transducer Failure)
—
If the signal from the 4 to 20 mA building pressure transducer
(used to control the power exhaust fans and the building pres-
sure) is above 22 mA or below 2 mA then the alert will occur.
If the alert occurs, then the economizer will be closed and the
power exhaust fans turned off. This alert will automatically
reset. Check the building pressure transducer and sensor
tubing. The sensor is located in the auxiliary control box. The
alert will automatically reset.
Alert Code 211 (Static Pressure Transducer Failure)
— If
the signal from the 4 to 20 mA static pressure transducer (used
to control the VFD speed) is above 22 mA or below 2 mA then
the alert will occur. This failure will cause the unit to stop
due to the potential damage that could occur due to over-
pressurization. Check the pressure transducer and sensor
tubing. The sensor is located in the auxiliary control box. The
alert will automatically reset.
Alert Code 221 (Indoor Air Quality Sensor
)—If the unit is
configured to use demand ventilation and an IAQ sensor and
the IAQ sensor input (IAQ) 4 to 20 mA reading is less than
2 mA or greater than 22 mA, then an alert will occur and the
demand limiting option will be stopped. The OAQ 4 to 20 mA
Sensor Config (OA.CF) must be configured for DCV or
LOKOUT. The alert will automatically reset.
Alert Code 229 (Economizer Minimum Position Override
Sensor Failure) — If the unit is configured to use the remote
position override for the economizer and the input Econo Min.
Pos. Override (E.MPO) input 4 to 20 mA reading is less than
2 mA or greater than 22 mA then an alert will occur and the
default software minimum position will be used for the econo-
mizer. The alert will automatically reset.
Alert 300 (Space Temperature Below Limit)
—Ifthespace
temperature is below the configurable SPT Low Alert Limits
(occupied [SPL.O] or unoccupied [SPL.U]), then the unit will
be stopped. The alert will automatically reset. The limits are
configurable and are located in the CONFIGURATION-
ALLM submenu.
Alert 301 (Space Temperature Above Limit)
—Ifthespace
temperature is above the configurable SPT High Alert Limits
(occupied [SPH.O] or unoccupied [SPH.U]), then the unit will
be stopped if the conditions for the alert are met. The alert will
automatically reset. The limits are configurable and are located
in the CONFIGURATION-ALLM submenu.
Alert 302 (Supply Temperature Below Limit)
— If the supply-
air temperature measured by the EDT sensor is below the con-
figurable SAT LO Alert Limit/Occ (SAL.O) or the Low Supply
air temperature alert limit unoccupied mode (SAL.U), then cool-
ing will be stopped but heating will continue. The limits are con-
figurable and are located in the CONFIGURATION-ALLM
submenu.
Alert 303 (Supply Temperature Above Limit)
— If the sup-
ply temperature is above the configurable SAT HI Alert Limit
Occ (SAH.O) or the SAT HI Alert Limit/Unocc (SAH.U), then
heating will be stopped but cooling will continue. The alert will
automatically reset. The limits are configurable and are located
in the CONFIGURATION-ALLM submenu.
Alert 304 (Return Air Temperature Below Limit)
—Ifthe
return air temperature measured by the RAT sensor is below
the configurable RAT LO Alert Limit/Occ (RAL.O) or RAT HI
Alert Limit/Occ (RAL.U), then the alert will occur and internal
routines will be modified. The unit will continue to run but
VAV heating will be disabled. The limits are configurable and
are located in the CONFIGURATION-ALLM submenu.
Alert 305 (Return Air Temperature Above Limit)
—Ifthe
return air temperature is below the RAT HI Alert Limit/Occ
(RAH.O) OR RAT HI Alert Limit/Occ (RAH.U), then the unit
will continue to run but the alert will be indicated.
The alert will automatically reset. The limits are config-
urableandarelocatedintheCONFIGURATION-ALLM
submenu.
Alert Code 308 (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 (RRHS)
setting, and the measured level is below the configurable RH
Low Alert Limit (IRH.L), then the alert will occur. The unit
will continue to run and the alert will automatically reset. The
limits can be set in the CONFIGURATION-ALLM submenu.
Alert Code 309 (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 (RRHS)
setting, and the measure level is above the configurable RH
High Alert Limit (IRH.H), then the alert will occur. Unit will
continue to run and the alert will automatically reset. The limits
can be set in the CONFIGURATION-ALLM submenu.
Alert Code 310 (Supply Duct Pressure Below Limit)
—If
the unit is a VAV unit with a supply duct pressure sensor and
the measure supply duct static pressure (DUCT) is below the
configurable SP Low Alert Limit (DP.L), then the alert will
occur. The unit will continue to run and the alert will automati-
cally reset. The limits can be set in the CONFIGURATION-
ALLM submenu.
Alert Code 311 (Supply Duct Pressure Above Limit)
—If
the unit is a VAV unit with a supply duct pressure sensor and
the measured supply duct static pressure (DUCT) is above the
configurable SP Low Alert Limit (DP.H), then the alert will
occur. The unit will continue to run and the alert will automati-
cally reset. The limits can be set in the CONFIGURATION-
ALLM submenu.
Alert Code 312 (Building Static Pressure Below Limit)
—
If the unit is configured to use modulating power exhaust then
a building static pressure limit can be configured in the
CONFIGURATION-ALLM submenu using the BP Low Alert
Limit (BP.L). If the measured pressure is below the limit then
the alert will occur.
Alert Code 313 (Building Static Pressure Above Limit)
—
If the unit is configured to use modulating power exhaust
then a building static pressure limit can be configured in
the CONFIGURATION-ALLM submenu using the BP
HI Alert Limit (BP.H). If the measured pressure is above the
limit, then the alert will occur. The limits can be set in the
CONFIGURATION-ALLM submenu.
Alert Code 314 (IAQ Above Limit)
— If the unit is config-
ured to use an CO
2
sensor and the level is above the
configurable IAQ High Alert Limit (IQ.HI) then the alert will
occur. The unit will continue to run and the alert will automati-
cally reset. The limits can be set in the CONFIGURATION-
ALLM submenu.
Alarm Code 404 (Fire Shutdown)
— This alarm occurs when
the fire shutdown input is active (either open or closed depend-
ing upon its configuration). This alarm is usually caused by
an auxiliary device that is trying to shut down the unit (e.g.,
smoke detector). The configuration for this switch input can be
found at variable FS.SW. Verify that the configuration is set
correct, verify the wiring and auxiliary device. This alarm
resets automatically.
Alarm Code 405 (Evacuation Emergency Mode)
— Unit has
been placed in the fire evacuation mode by means of the exter-
nal command for evacuation (F.EVC).