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96
Table 62 —
Alert Limit Configuration
Building Pressure Low Alert Limit (BP.L)
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 (
BP.L
). If the measured pressure is below the
limit then Alert 312 will occur.
Building Pressure High Alert Limit (BP.H)
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 (
BP.H
). If the measured pressure is above the
limit, then Alert 313 will occur.
Indoor Air Quality High Alert Limit (IAQ.H)
If the unit is configured to use a CO
2
sensor and the level is
above the configurable IAQ High Alert Limit (
IAQ.H
), then
the alert will occur. The unit will continue to run, and the alert
will automatically reset.
Sensor Trim Configuration
The TRIM submenu is used to calibrate the sensor trim set
-
tings. The trim settings are used when the actual measured
reading does not match the sensor output. The sensor can be
adjusted to match the actual measured reading with the trim
function. A list is shown in Table 63.
Air Temperature Leaving Supply Fan Sensor (SAT.T)
This variable is used to adjust the supply fan temperature sen
-
sor reading. The sensor reading can be adjusted ± 10°F to
match the actual measured temperature.
Return Air Temperature Sensor Trim (RAT.T)
This variable is used to adjust the return air temperature sensor
reading. The sensor reading can be adjusted ± 10°F to match
the actual measured temperature.
Outdoor Air Temperature Sensor Trim (OAT.T) —
This variable is used to adjust the outdoor air temperature sen
-
sor reading. The sensor reading can be adjusted ± 10°F to
match the actual measured temperature.
Space Temperature Sensor Trim (SPT.T)
This variable is used to adjust the space temperature sensor
reading. The sensor reading can be adjusted ± 10°F to match
the actual measured temperature.
Limit Switch Trim (L.SW.T)
This variable is used to adjust the limit switch temperature sen
-
sor reading. The sensor reading can be adjusted ± 10°F to
match the actual measured temperature.
Air Temperature Leaving Evaporator Trim (CCT.T)
This variable is used to adjust the leaving evaporator tempera
-
ture sensor reading. The sensor reading can be adjusted ± 10°F
to match the actual measured temperature.
A1 Discharge Temperature (DTA.1)
This variable is used to adjust the A1 compressor discharge
temperature sensor reading. The sensor reading can be adjusted
± 10°F to match the actual measured temperature.
NOTE: Due to the resolution of the control board analog input,
temperature readings less than 50°F will become increasingly
inaccurate as the temperature decreases.
Suction Pressure Circuit A Trim (SP.A.T)
This variable is used to adjust the suction pressure sensor read
-
ing for Circuit A. The sensor reading can be adjusted ± 50 psig
to match the actual measured pressure.
Suction Pressure Circuit B Trim (SP.B.T)
This variable is used to adjust the suction pressure sensor read
-
ing for Circuit B. The sensor reading can be adjusted ± 50 psig
to match the actual measured pressure.
Discharge Pressure Circuit A Trim (DP.A.T)
This variable is used to adjust the discharge pressure sensor
reading for Circuit A. The sensor reading can be adjusted ± 50
psig to match the actual measured pressure.
Discharge Pressure Circuit B Trim (DP.B.T)
This variable is used to adjust the discharge pressure sensor
reading for Circuit B. The sensor reading can be adjusted ±50
psig to match the actual measured pressure.
Liquid Pressure Circuit A Trim (LP.A.T)
This variable is used to adjust the liquid pressure sensor read
-
ing for Circuit A. The sensor reading can be adjusted ± 50 psig
to match the actual measured pressure.
Liquid Pressure Circuit B Trim (LP.B.T)
This variable is used to adjust the liquid pressure sensor read
-
ing for Circuit B. The sensor reading can be adjusted ± 50 psig
to match the actual measured pressure.
ITEM
EXPANSION
RANGE
UNITS
CCN POINT
DEFAULT
SP.L.O
SPT lo alert limit/occ
-10-245
dF
SPLO
60
SP.H.O
SPT hi alert limit/occ
-10-245
dF
SPHO
85
SP.L.U
SPT lo alert limit/unocc
-10-245
dF
SPLU
45
SP.H.U
SPT hi alert limit/unocc
-10-245
dF
SPHU
100
SA.L.O
EDT lo alert limit/occ
-40-245
dF
SALO
40
SA.H.O
EDT hi alert limit/occ
-40-245
dF
SAHO
100
SA.L.U
EDT lo alert limit/unocc
-40-245
dF
SALU
40
SA.H.U
EDT hi alert limit/unocc
-40-245
dF
SAHU
100
RA.L.O
RAT lo alert limit/occ
-40-245
dF
RALO
60
RA.H.O
RAT hi alert limit/occ
-40-245
dF
RAHO
90
RA.L.U
RAT lo alert limit/unocc
-40-245
dF
RALU
40
RA.H.U
RAT hi alert limit/unocc
-40-245
dF
RAHU
100
OAT.L
OAT lo alert limit
-40-245
dF
OATL
-40
OAT.H
OAT hi alert limit
-40-245
dF
OATH
150
R.RH.L
RARH low alert limit
0-100
%
RRHL
0
R.RH.H
RARH high alert limit
0-100
%
RRHH
100
O.RH.L
OARH low alert limit
0-100
%
ORHL
0
O.RH.H
OARH high alert limit
0-100
%
ORHH
100
SP.L
SP low alert limit
0-5
"H2O
SPL
0
SP.H
SP high alert limit
0-5
"H2O
SPH
2
BP.L
BP lo alert limit
-0.25-0.25
"H2O
BPL
-0.25
BP.H
BP high alert limit
-0.25-0.25
"H2O
BPH
0.25
IAQ.H
IAQ high alert limit
0-5000
IAQH
1200
IMPORTANT: Sensor trim must not be used to extend unit
operation past the allowable operating range. Doing so may
impair or negatively affect the Carrier product warranty.
Summary of Contents for WeatherExpert 48N2
Page 135: ...135 Fig 18 48 50N Typical Power Schematic Nominal 075 Ton Unit Shown ...
Page 136: ...136 Fig 19 48 50N Typical Power Schematic Nominal Ton 90 150 Units Shown ...
Page 137: ...137 Fig 20 48 50N Main Base Board Input Output Connections ...
Page 138: ...138 Fig 21 48 50N RXB EXB CEM Input Output Connections a48 9307 ...
Page 139: ...139 Fig 22 48 50N EXV SCB Input Output Connections a48 9308 ...
Page 140: ...140 Fig 23 48N Typical Modulating Gas Heat Unit Control Wiring ...
Page 141: ...141 Fig 24 50N Typical Electric Heat Unit Control Wiring ...
Page 144: ...144 Fig 27 48N Typical Gas Heat Section Wiring Nominal Ton 120 to 150 Units ...
Page 145: ...145 Fig 28 48 50N Typical Power Component Control Wiring 460 v ...
Page 146: ...146 Fig 29 48 50N Component Control Wiring 575 v Nominal Ton 075 to 150 Units ...
Page 147: ...147 Fig 30 48 50N Component Arrangement Power Box ...
Page 148: ...148 Fig 31 48 50N Component Arrangement Control Box ...
Page 240: ...240 APPENDIX D VFD INFORMATION CONT Fig G VFD Bypass Wiring Diagram WHEN USED ...