75
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 automati-
cally reset.
Sensor Trim Configuration —
The TRIM submenu
is used to calibrate the sensor trim settings. 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 73.
Air Temperature Leaving Supply Fan Sensor (
SAT.T
) — This
variable is used to adjust the supply fan temperature sensor
reading. The sensor reading can be adjusted ± 10° F to match
the actual measured temperature.
Return Air Temperature Sensor Trim (
RAT.T
) — This vari-
able 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 vari-
able is used to adjust the outdoor air temperature sensor read-
ing. 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.
Suction Pressure Circuit A Trim (
SP.A.T
) — This variable is
used to adjust the suction pressure sensor reading for circuit A.
The sensor reading can be adjusted ± 50 psig to match the actu-
al measured pressure.
Suction Pressure Circuit B Trim (
SP.B.T
) — This variable is
used to adjust the suction pressure sensor reading for circuit B.
The sensor reading can be adjusted ± 50 psig to match the actu-
al measured pressure.
Discharge Pressure Circuit A Trim (
DP.A.T
) — This vari-
able 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 vari-
able 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.
4 to 20 mA Inputs — There are a number of 4 to 20 mA in-
puts which may be calibrated. These inputs are located in
Inputs
4-20
. They are:
•
SP.M.T
— static pressure milliamp trim
•
BP.M.T
— building pressure milliamp trim
•
OA.M.T
— outside air cfm milliamp trim
•
RA.M.T
— return air cfm milliamp trim
•
SA.M.T
— supply air cfm milliamp trim
Discrete Switch Logic Configuration —
The
SW.LG
submenu is used to configure the normally open/normally closed
settings of switches and inputs. This is used when field-supplied
switches or input devices are used instead of Carrier devices. The
normally open or normally closed setting may be different on a
field-supplied device. These points are used to match the control
logic to the field-supplied device.
The defaults for this switch logic section will not normally
need changing. However, if a field-installed switch is used that
is different from the Carrier switch, these settings may need
adjustment.
Settings for switch logic are found at the local displays
under the
Configuration
SW.LG
submenu. See Table 74.
Filter Status Input — Clean (
FTS.L
) — The filter status in-
put for clean filters is set for normally open. If a field-supplied
filter status switch is used that is normally closed for a clean
filter, change this variable to closed.
IGC Feedback — Off (
IGC.L
) — The input for IGC feed-
back is set for normally open for off. If a field-supplied IGC
feedback switch is used that is normally closed for feedback
off, change this variable to closed.
Remote Switch — Off (
RMI.L
) — The remote switch is set
for normally open when off. If a field-supplied control switch
is used that is normally closed for an off signal, change this
variable to closed.
Economizer Switch — No (
ECS.L
) — The economizer
switch is set for normally open when low. If a field-supplied
economizer switch is used that is normally closed when low,
change this variable to closed.
Fan Status Switch — Off (
SFS.L
) — The fan status switch
input is set for normally open for off. If a field-supplied fan
status switch is used that is normally closed, change this
variable to closed.
Demand Limit Switch 1 — Off (
DL1.L
) — The demand
limit switch no. 1 input is set for normally open for off. If a
field-supplied demand limit switch is used that is normally
closed, change this variable to closed.
Table 73 — Sensor Trim Configuration
IMPORTANT: Sensor trim must not be used to extend
unit operation past the allowable operating range.
Doing so may void the warranty.
IMPORTANT: Many of the switch inputs to the con-
trol can be configured to operate as normally open or
normally closed.
ITEM
EXPANSION
RANGE
UNITS
POINT
DEFAULT
SAT.T
Air Temp Lvg SF Trim
-10 - 10
^F
SAT_TRIM
0
RAT.T
RAT Trim
-10 - 10
^F
RAT_TRIM
0
OAT.T
OAT Trim
-10 - 10
^F
OAT_TRIM
0
SPT.T
SPT Trim
-10 - 10
^F
SPT_TRIM
0
CTA.T
Cir A Sat.Cond.Temp Trim
-30 - 30
^F
SCTATRIM
0
CTB.T
Cir B Sat.Cond.Temp Trim
-30 - 30
^F
SCTBTRIM
0
SP.A.T
Suct.Press.Circ.A Trim
-50 - 50
PSIG
SPA_TRIM
0
SP.B.T
Suct.Press.Circ.B Trim
-50 - 50
PSIG
SPB_TRIM
0
DP.A.T
Dis.Press.Circ.A Trim
-50 - 50
PSIG
DPA_TRIM
0
DP.B.T
Dis.Press.Circ.B Trim
-50 - 50
PSIG
DPB_TRIM
0
Содержание Carrier Weathermaker 48A2
Страница 105: ...105 Fig 20 Typical Main Control Box Wiring Schematic 48 50A2 A3 A4 A5 Units...
Страница 106: ...106 Fig 21 Typical Auxiliary Control Box Wiring Schematic...
Страница 107: ...107 Fig 22 Typical 2 Stage Gas Heat Wiring Schematic Size 060 Units Shown a48 8357...
Страница 108: ...108 TO NEXT PAGE Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown A48 7296...
Страница 109: ...109 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown cont A48 8358...
Страница 110: ...110 Fig 24 Typical Electric Heat Control Schematic 50 Series Size 060 Units Shown a50 8228...
Страница 111: ...111 Fig 25 Typical Power Schematic 48 50A2 A3 A4 A5 060 Unit Shown...
Страница 112: ...112 Fig 26 Typical Low Ambient Controls Option Wiring...
Страница 113: ...113 Fig 27 Typical Small Chassis Component Location Size 020 035 Units...
Страница 114: ...114 Fig 28 Typical Large Chassis Component Locations Size 040 060 Units...
Страница 118: ...118 Fig 30 Economizer Control Board ECB1 and VAV Control Board ECB2 A48 7706...
Страница 142: ...142 A48 3733 Fig 56 Main Burner Removal...
Страница 176: ...176 APPENDIX C VFD INFORMATION cont Fig F Internal Enclosure Fan Replacement A48 7716...