98
Table 75 — CCN Configuration
Alert Limit Configuration
The ALLM submenu is used to configure the alert limit set points.
A list is shown in Table 76.
SPT Low Alert Limit/Occ (SP.L.O)
If the space temperature is below the configurable occupied SPT
Low Alert Limit (SP.L.O), then Alert 300 will be generated and
the unit will be stopped. The alert will automatically reset.
SPT High Alert Limit/Occ (SP.H.O)
If the space temperature is above the configurable occupied SPT
High Alert Limit (SP.H.O), then Alert 301 will be generated and
the unit will be stopped. The alert will automatically reset.
SPT Low Alert Limit/Unocc (SP.L.U)
If the space temperature is below the configurable unoccupied
SPT Low Alert Limit (SP.L.U), then Alert 300 will be generated
and the unit will be stopped. The alert will automatically reset.
SPT High Alert Limit/Unocc (SP.H.U)
If the space temperature is above the configurable unoccupied
SPT High Alert Limit (SP.H.U), then Alert 301 will be generated
and the unit will be stopped. The alert will automatically reset.
EDT Low Alert Limit/Occ (SA.L.O)
If the space temperature is below the configurable occupied evap-
orator discharge temperature (EDT) Low Alert Limit (SA.L.O),
then Alert 302 will be generated and cooling operation will be
stopped but heating operation will continue. The alert will auto-
matically reset.
EDT High Alert Limit/Occ (SA.H.O)
If the space temperature is above the configurable occupied EDT
High Alert Limit (SA.H.O), then Alert 303 will be generated and
heating operation will be stopped but cooling operation will con-
tinue. The alert will automatically reset.
EDT Low Alert Limit/Unocc (SA.L.U)
If the space temperature is below the configurable unoccupied
EDT Low Alert Limit (SA.L.U), then Alert 302 will be generated
and cooling operation will be stopped but heating operation will
continue. The alert will automatically reset.
EDT High Alert Limit/Unocc (SA.H.U)
If the space temperature is above the configurable unoccupied
EDT High Alert Limit (SA.H.U), then Alert 303 will be generated
and heating operation will be stopped but cooling operation will
continue. The alert will automatically reset.
RAT Low Alert Limit/Occ (RA.L.O)
If the return-air temperature is below the configurable occupied
RAT Low Alert Limit (RA.L.O), then Alert 304 will be generated
and internal routines will be modified. Unit operation will contin-
ue but VAV heating operation will be disabled. The alert will auto-
matically reset.
RAT High Alert Limit/Occ (RA.H.O)
If the return-air temperature is above the configurable occupied
RAT High Alert Limit (RA.H.O), then Alert 305 will be generated
and operation will continue. The alert will automatically reset.
RAT Low Alert Limit/Unocc (RA.L.U)
If the return-air temperature is below the configurable unoccupied
RAT Low Alert Limit (RA.L.U), then Alert 304 will be generated.
Unit operation will continue but VAV heating operation will be
disabled. The alert will automatically reset.
RAT High Alert Limit/Unocc (RA.H.U)
If the return-air temperature is above the configurable unoccupied
RAT High Alert Limit (RA.H.U), then Alert 305 will be generat-
ed. Operation will continue. The alert will automatically reset.
OAT Low Alert Limit (OAT.L)
If the outside-air temperature measured by the OAT thermistor is
below the configurable OAT Low Alert Limit (OAT.L) then alert
T316 will be generated.
OAT High Alert Limit (OAT.H)
If the outside-air temperature measured by the OAT thermistor is
above the configurable OAT High Alert Limit (OAT.H) then alert
T317 will be generated.
RARH Low Alert Limit (R.RH.L)
If the unit is configured to use a return air relative humidity sensor
(Configuration
UNIT
SENS
RRH.S), and the measured
level is below the configurable RH Low Alert Limit (R.RH.L),
then Alert 308 will occur. The unit will continue to run and the
alert will automatically reset.
RARH High Alert Limit (R.RH.H)
If the unit is configured to use a return air relative humidity sensor
(Configuration
UNIT
SENS
RRH.S), and the measured
level is above the configurable RARH High Alert Limit
(R.RH.H), then Alert 309 will occur. The unit will continue to run
and the alert will automatically reset.
OARH Low Alert Limit (O.RH.L)
If the unit is configured to use an outdoor air relative humidity
sensor (Configuration
ECON
ORH.S) and the measured
level is below the configurable OARH Low Alert Limit
(O.RH.L), then economizer operation will be disabled. The unit
will continue to run and the alert will automatically reset.
ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT
CCN CCN CONFIGURATION
CCNA CCN Address 1 to 239 CCNADD 1
CCNB CCN Bus Number 0 to 239 CCNBUS 0
BAUD CCN Baud Rate 1 to 5 CCNBAUDD 3
BROD CCN BROADCST DEFINITIONS
TM.DT CCN Time/Date Broadcast ON/OFF CCNBC On
OAT.B CCN OAT Broadcast ON/OFF OATBC Off
ORH.B CCN OARH Broadcast ON/OFF OARHBC Off
OAQ.B CCN OAQ Broadcast ON/OFF OAQBC Off
G.S.B Global Schedule Broadcst ON/OFF GSBC Off
B.ACK CCN Broadcast Ack'er ON/OFF CCNBCACK Off
SC.OV CCN SCHEDULES-OVERRIDES
SCH.N Schedule Number 0 to 99 SCHEDNUM 1
HOL.T Accept Global Holidays? YES/NO HOLIDAYT No
O.T.L Override Time Limit 0 to 4 HRS OTL 1
OV.EX Timed Override Hours 0 to 4 HRS OVR_EXT 0
SPT.O SPT Override Enabled? YES/NO SPT_OVER Yes
T58.O T58 Override Enabled? YES/NO T58_OVER Yes
GL.OV Global Sched. Override? YES/NO GLBLOVER No
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