78
Accept Global Holidays? (HOL.T)
If a device is broadcasting the time on the bus, it is possible to
accept the time yet not accept the global holiday from the
broadcast message.
Override Time Limit (O.T.L)
This configuration allows the user to decide how long an over-
ride occurs when it is initiated. The override may be config-
ured from 1 to 4 hours. If the time is set to 0, the override func-
tion will become disabled.
Timed Override Hours (OV.EX)
This displays the current number of hours left in an override. It
is possible to cancel an override in progress by writing “0” to
this variable, thereby removing the override time left.
SPT Override Enabled? (SPT.O)
If a space sensor is present, then it is possible to override an
unoccupied period by pushing the override button on the T55
or T56 sensor. This option allows the user to disable this func-
tion by setting this configuration to NO.
T58 Override Enabled? (T58.O)
The T58 sensor is a CCN device that allows cooling/heating
setpoints to be adjusted, space temperature to be written to the
rooftop unit, and the ability to initiate a timed override. This
option allows the user to disable the override initiated from the
T58 sensor by setting this option to NO.
Global Schedule Override? (GL.OV)
If the control is set to receive global schedules then it is also
possible for the global schedule broadcaster to call out an over-
ride condition as well. This configuration allows the user to
disable the global schedule broadcaster from overriding the
control.
Alert Limit Configuration
The ALLM submenu is used to configure the alert limit set-
points. A list is shown in Table 71.
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 gener-
ated 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 gener-
ated and the unit will be stopped. The alert will automatically
reset.
EDT Low Alert Limit/Occ (SA.L.O)
If the evaporator discharge temperature is below the configu-
rable occupied evaporator 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 automatically reset.
EDT High Alert Limit/Occ (SA.H.O)
If the evaporator discharge temperature is above the configu-
rable occupied EDT High Alert Limit (SA.H.O), then Alert
303 will be generated and heating operation will be stopped but
cooling operation will continue. The alert will automatically
reset.
EDT Low Alert Limit/Unocc (SA.L.U)
If the evaporator discharge temperature is below the configu-
rable 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 automatical-
ly reset.
EDT High Alert Limit/Unocc (SA.H.U)
If the evaporator discharge temperature is above the configu-
rable 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 occu-
pied RAT Low Alert Limit (RA.L.O), then Alert 304 will be
generated and internal routines will be modified. Unit opera-
tion will continue but VAV heating operation will be disabled.
The alert will automatically 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 gener-
ated and operation will continue. The alert will automatically
reset.
Table 71 — Alert Limit Configuration
ITEM EXPANSION RANGE UNITS POINT DEFAULT
SP.L.O SPT lo alert limit/occ -10 to 245 dF SPLO 60
SP.H.O SPT hi alert limit/occ -10 to 245 dF SPHO 85
SP.L.U SPT lo alert limit/unocc -10 to 245 dF SPLU 45
SP.H.U SPT hi alert limit/unocc -10 to 245 dF SPHU 100
SA.L.O EDT lo alert limit/occ -40 to 245 dF SALO 40
SA.H.O EDT hi alert limit/occ -40 to 245 dF SAHO 100
SA.L.U EDT lo alert limit/unocc -40 to 245 dF SALU 40
SA.H.U EDT hi alert limit/unocc -40 to 245 dF SAHU 100
RA.L.O RAT lo alert limit/occ -40 to 245 dF RALO 60
RA.H.O RAT hi alert limit/occ -40 to 245 dF RAHO 90
RA.L.U RAT lo alert limit/unocc -40 to 245 dF RALU 40
RA.H.U RAT hi alert limit/unocc -40 to 245 dF RAHU 100
R.RH.L RARH low alert limit 0 to 100 % RRHL 0
R.RH.H RARH high alert limit 0 to 100 % RRHH 100
SP.L SP low alert limit 0 to 5 " H2O SPL 0
SP.H SP high alert limit 0 to 5 " H2O SPH 2
BP.L BP lo alert limit -0.25 to 0.25 " H2O BPL -0.25
BP.H BP high alert limit -0.25 to 0.25 " H2O BPH 0.25
IAQ.H IAQ high alert limit 0 to 5000 IAQH 1200
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