Alert Limit Configuration - United Technologies Carrier Weathermaker 48A2 Controls, Start-Up, Operation, Service, And Troubleshooting

SPT Override Enabled? (SPT.O) — If a space sensor is pres-
ent, 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 function 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 abil-
ity 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 override condition as well.
This configuration allows the user to disable the global sched-
ule broadcaster from overriding the control.
Alert Limit Configuration —
used to configure the alert limit setpoints. A list is shown in
Table 72.
SPT Low Alert Limit/Occ (SP.L.O) — If the space tempera-
ture 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 tempera-
ture 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 tem-
perature 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 tem-
perature 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 evaporator dis-
charge temperature is below the configurable occupied
evaporator discharge temperature (EDT) Low Alert Limit
(SA.L.O), then Alert 302 will be generated and cooling opera-
tion 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 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 continue. The alert will automatically reset.
EDT Low Alert Limit/Unocc (SA.L.U) — If the evaporator
discharge temperature is below the configurable unoccupied
EDT Low Alert Limit (SA.L.U), then Alert 302 will be
ITEM
SP.L.O SPT lo alert limit/occ
SP.H.O SPT hi alert limit/occ
SP.L.U SPT lo alert limit/unocc
SP.H.U SPT hi alert limit/unocc
SA.L.O EDT lo alert limit/occ
SA.H.O EDT hi alert limit/occ
SA.L.U EDT lo alert limit/unocc
SA.H.U EDT hi alert limit/unocc
RA.L.O RAT lo alert limit/occ
RA.H.O RAT hi alert limit/occ
RA.L.U RAT lo alert limit/unocc
RA.H.U RAT hi alert limit/unocc
R.RH.L RARH low alert limit
R.RH.H RARH high alert limit
SP.L SP low alert limit
SP.H SP high alert limit
BP.L BP lo alert limit
BP.H BP high alert limit
IAQ.H IAQ high alert limit
The ALLM submenu is
Table 72 — Alert Limit Configuration
EXPANSION
-10-245
-10-245
-10-245
-10-245
-40-245
-40-245
-40-245
-40-245
-40-245
-40-245
-40-245
-40-245
0-100
0-100
0-5
0-5
-0.25-0.25
-0.25-0.25
0-5000
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 evaporator
discharge temperature is above the configurable unoccupied
EDT High Alert Limit (SA.H.U), then Alert 303 will be generat-
ed 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 tem-
perature 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 continue but
VAV heating operation will be disabled. The alert will automat-
ically 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 dis-
abled. 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 generated. Oper-
ation will continue. The alert will automatically reset.
RARH Low Alert Limit (R.RH.L) — If the unit is configured
to use a return air relative humidity sensor (Configura-
  
tion UNIT SENS
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 config-
ured to use a return air relative humidity sensor (Configura-
  
tion UNIT SENS
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.
Supply Duct Pressure Low Alert Limit (SP.L) — If the unit
is a VAV unit with a supply duct pressure sensor and the mea-
sured supply duct static pressure is below the configurable SP
Low Alert Limit (DP.L), then Alert 310 will occur. The unit
will continue to run and the alert will automatically reset.
Supply Duct Pressure High Alert Limit (SP.H) — If the unit
is a VAV unit with a supply duct pressure sensor and the mea-
sured supply duct static pressure is above the configurable SP
High Alert Limit (SP.H), then Alert 311 will occur. The unit
will continue to run and the alert will automatically reset.
RANGE UNITS
dF
dF
dF
dF
dF
dF
dF
dF
dF
dF
dF
dF
%
%
" H2O
" H2O
" H2O
" H2O
74
RRH.S), and the measured level is
RRHS), and the measured level is
POINT DEFAULT
SPLO 60
SPHO 85
SPLU 45
SPHU 100
SALO 40
SAHO 100
SALU 40
SAHU 100
RALO 60
RAHO 90
RALU 40
RAHU 100
RRHL 0
RRHH 100
SPL 0
SPH 2
BPL -0.25
BPH 0.25
IAQH 1200