Specifications

83
Alert code 178 (4-20 mA Static Pressure Reset Failure)
—
If this transducer fails (if the signal reads less than 2 mA or is
above 22 mA), and the unit is configured to perform static
pressure reset with this transducer, no static pressure reset will
be performed and an alert will be generated. Recovery is auto-
matic. Reason for error is either a faulty sensor, wiring error, or
damaged input on the CEM control board.
Alarm Code 200 (Linkage Timeout Error — Loss of Com-
munications) — If linkage is established via the CCN with
ComfortID™ terminals, a 5-minute timeout on loss of commu-
nication will be monitored. If 5 minutes expires since the last
communication from a VAV Linkage Master, the unit will re-
move the link and flag the alert. When the rooftop looses its
link, the temperature and set points are derived locally. Recov-
ery is automatic on re-establishment of communications. Rea-
son for failure may be wiring error, too much bus activity, or
damaged 485 drivers.
Alert Code 210 (Building Pressure Transducer Failure)
—
The building pressure transducer (Pressures → AIR.P → BP)
fails if the signal from the 4 to 20 mA building pressure trans-
ducer (used to control the power exhaust fans and the building
pressure) is above 22 mA or below 2 mA. If the alert occurs,
then the economizer will be closed and the power exhaust fans
turned off. This alert will automatically reset. Check the build-
ing 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)
—
Thestaticpressuretransducer(Pressures
→ AIR.P → SP)fails
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. This failure will cause the unit to stop due to the poten-
tial 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 220 (Indoor Air Quality Sensor Failure)
—Ifthe
indoor air quality sensor (Inputs → AIR.Q → IAQ)fails,
demand control ventilation is not possible. The control defaults
to the max vent position. Recovery is automatic. Reason for
error is either a faulty sensor, wiring error, or damaged input on
the MBB control board.
Alert Code 221 (Outdoor Air Quality Sensor Failure)
—If
the outdoor air quality sensor (Inputs → AIR.Q → OAQ)fails,
OAQ defaults to 400 ppm and demand control ventilation will
continue. Recovery is automatic. Reason for error is either a
faulty sensor, wiring error, or damaged input on the CEM con-
trol board.
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 (Configuration
→ IAQ → AQ.SP → IQ.O.P) 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 economizer. The alert will auto-
matically reset.
Alert Code 300 (Space Temperature Below Limit)
—Ifthe
space temperature is below the configurable SPT Low Alert
Limits (occupied [Configuration → ALLM → SP.L.O]for
5 minutes or unoccupied [Configuration
→ ALLM → SP.L.U]
for 10 minutes), then an alert will be broadcast. The alert will
automatically reset.
Alert Code 301 (Space Temperature Above Limit)
—Ifthe
space temperature 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.
Alert Code 302 (Supply Temperature Below Limit)
—Ifthe
supply-air temperature measured by the supply temperature
sensor is below the configurable SAT LO Alert Limit/Occ
(Configuration
→ ALLM → SA.L.O) for 5 minutes or the Low
Supply air temperature alert limit unoccupied mode (Configura-
tion
→ ALLM → SA.L.U) for 10 minutes, then an alert will be
broadcast.
Alert Code 303 (Supply Temperature Above Limit)
—Ifthe
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.
Alert Code 304 (Return Air Temperature Below Limit)
—
If the return-air temperature measured by the RAT sensor is
below the configurable RAT LO Alert Limit/Occ (Configura-
tion
→ 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.
Alert Code 305 (Return Air Temperature Above Limit)
—
If the return-air temperature is below the RAT HI Alert Limit/
Occ (Configuration → 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.
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 (Configu-
ration
→ UNIT → SENS → RRH.S) setting, and the measured
level is below the configurable RH Low Alert Limit (Configu-
ration
→ ALLM → R.RH.L) for 5 minutes, then the alert will
occur. The unit will continue to run and the alert will automati-
cally reset.
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 (Configu-
ration
→ UNIT → SENS → RRH.S) setting, and the measured
level is above the configurable RH High Alert Limit (Configu-
ration → ALLM → R.RH.H) for 5 minutes, then the alert will
occur. Unit will continue to run and the alert will automatically
reset.
Alert Code 310 (Supply Duct 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
automatically reset.
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 (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
automatically reset.
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 using the BP
Low Alert Limit (Configuration
→ ALLM → BP.L). If the mea-
sured pressure (Pressures
→ AIR.P → BP) is below the limit for
5 minutes 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 using the BP
HI Alert Limit (Configuration
→ ALLM → BP.H). If the mea-
sured pressure (Pressures → AIR.P → BP) is above the limit for
5 minutes, then the alert will occur.
Alert Code 314 (IAQ Above Limit)
— If the unit is config-
ured to use an CO
2
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.