101
of the CEM module), and the unit is configured to perform
static pressure reset or remote control of the supply fan VFD
with this transducer, no static pressure reset or VFD control
will be performed and an alert will be generated. Recovery is
automatic. Reason for error is either a faulty sensor, wiring
error, or damaged input on the CEM control board.
A200 (Linkage Timeout Error — Comm Failure)
—
If link-
age is established via the CCN with ComfortID™ terminals, a
5-minute timeout on loss of communication will be monitored.
If 5 minutes expires since the last communication from a VAV
Linkage Master, the unit will remove the link and flag the alert.
When the rooftop looses its link, the temperature and setpoints
are derived locally. Recovery is automatic on re-establishment
of communications. Reason for failure may be wiring error, too
much bus activity, or damaged 485 drivers.
T210 (Building Pressure Transducer Failure)
— The building
pressure transducer (
Pressures
AIR.P
BP
) fails if the
signal from the 4 to 20 mA building pressure transducer (used
to control the power exhaust fans and the building pressure) is
below 2 mA. If the alert occurs, then the economizer will be
closed and the power exhaust fans turned off. This alert will
automatically reset. Check the building pressure transducer and
sensor tubing. The sensor is located in the auxiliary control
box. The alert will automatically reset.
T211 (Static Pressure Transducer Failure)
— The static pres-
sure transducer (
Pressures
AIR.P
SP
) fails if the signal
from the 4 to 20 mA static pressure transducer (used to control
the VFD speed) is below 2 mA. This failure will cause the unit
to stop due to the potential damage that could occur due to
over-pressurization. Check the pressure transducer and sensor
tubing. The sensor is located in the auxiliary control box. The
alert will automatically reset.
T220 (Indoor Air Quality Sensor Failure) — The indoor air
quality sensor (
Inputs
AIR.Q
IAQ
) fails if the signal from
the 4 to 20 mA sensor is below 2 mA. If the indoor air quality
sensor fails, demand control ventilation is not possible. The
control defaults to the maximum vent position. Recovery is au-
tomatic. Reason for error is either a faulty sensor, wiring error,
or damaged input on the MBB control board.
T221 (Outdoor Air Quality Sensor Failure) — The indoor air
quality sensor (
Inputs
AIR.Q
OAQ
) fails if the signal from
the 4 to 20 mA sensor is below 2 mA. If the outdoor air quality
sensor fails, OAQ defaults to 400 ppm and demand control
ventilation will continue. Recovery is automatic. Reason for
error is either a faulty sensor, wiring error, or damaged input on
the CEM control board.
T229 (Economizer Minimum Position Override Input Fail-
ure)
—
If the unit is configured to use the remote position
override for the economizer and the input Econo Min. Pos.
Override (
Configuration
IAQ
AQ.SP
IQ.O.P
) input 4 to
20 mA reading is less than 2 mA then an alert will occur and
the default software minimum position will be used for the
economizer. The alert will automatically reset.
T300 (Space Temperature Below Limit) — If the space tem-
perature is below the configurable SPT Low Alert
Limits (occupied [
Configuration
ALLM
SP.L.O
] for
5 minutes or unoccupied [
Configuration
ALLM
SP.L.U
]
for 10 minutes), then an alert will be broadcast. The alert will
automatically reset.
T301 (Space Temperature Above Limit) — If the space tem-
perature is above the configurable SPT High Alert
Limits (occupied [
Configuration
ALLM
SP.H.O
] for
5 minutes or unoccupied [
Configuration
ALLM
SP.H.U
]
for 10 minutes), then an alert will be broadcast. The alert will
automatically reset.
T302 (Supply Temperature Below Limit) — If the supply-air
temperature measured by the supply temperature sensor is
below the configurable SAT LO Alert Limit/Occ (
Configura-
tion
ALLM
SA.L.O
) for 5 minutes or the SAT LO Alert
Limit/Unocc (
Configuration
ALLM
SA.L.U
) for 10 min-
utes, then an alert will be broadcast.
T303 (Supply Temperature Above Limit) — If the supply
temperature is above the configurable SAT HI Alert Limit Occ
(
Configuration
ALLM
SA.H.O
) for 5 minutes or the SAT
HI Alert Limit/Unocc (
Configuration
ALLM
SA.H.U
) for
10 minutes, then an alert will be broadcast. The alert will
automatically reset.
T304 (Return Air Temperature Below Limit) — If the return-
air temperature measured by the RAT sensor is below the
configurable RAT LO Alert Limit/Occ (
Configuration
ALLM
RA.L.O
) for 5 minutes or RAT LO Alert Limit/Un-
occ (
Configuration
ALLM
RA.L.U
) for 10 minutes, then
an alert will be broadcast.
T305 (Return Air Temperature Above Limit) — If the return-
air temperature is below the RAT HI Alert Limit/Occ (
Config-
uration
ALLM
RA.H.O
) for 5 minutes or RAT HI
Alert Limit/Unocc (
Configuration
ALLM
RA.H.U
) for
10 minutes, then an alert will be broadcast. The alert will
automatically reset.
T308 (Return Air Relative Humidity Below Limit) — If the
unit is configured to use a return air relative humidity sensor
through the Return Air RH Sensor (
Configuration
UNIT
SENS
RRH.S
) setting, and the measured level is
below the configurable RH Low Alert Limit (
Configuration
ALLM
R.RH.L
) for 5 minutes, then the alert will occur.
The unit will continue to run and the alert will automatically
reset.
T309 (Return Air Relative Humidity Above Limit) — If the
unit is configured to use a return air relative humidity sensor
through the Return Air RH Sensor (
Configuration
UNIT
SENS
RRH.S
) setting, and the measured level is
above the configurable RH High Alert Limit (
Configuration
ALLM
R.RH.H
) for 5 minutes, then the alert will occur.
Unit will continue to run and the alert will automatically reset.
T310 (Supply Duct Static Pressure Below Limit) — If the unit
is a VAV unit with a supply duct pressure sensor and the mea-
sured supply duct static pressure (
Pressures
AIR.P
SP
) is
below the configurable SP High Alert Limit (
Configura-
tion
ALLM
SP.L
) for 5 minutes, then the alert will occur.
The unit will continue to run and the alert will automatically
reset.
T311 (Supply Duct Static Pressure Above Limit) —
If the unit
is a VAV unit with a supply duct pressure sensor and the
measured supply duct static pressure (
Pressures
AIR.P
SP
) is above the configurable SP High Alert Limit (
Configura-
tion
ALLM
SP.H
) for 5 minutes, then the alert will occur.
The unit will continue to run and the alert will automatically
reset.
T312 (Building Static Pressure Below Limit) — If the unit is
configured to use a VFD controlled power exhaust or a modu-
lating power exhaust then a building static pressure limit can be
configured using the BP Low Alert Limit (
Configuration
ALLM
BP.L
). If the measured pressure (
Pressures
AIR.P
BP
) is below the limit for 5 minutes then the alert will
occur.
T313 (Building Static Pressure Above Limit) — If the unit is
configured to use a VFD controlled power exhaust or a modu-
lating power exhaust then a building static pressure limit can be
configured using the BP HI Alert Limit (
Configuration
ALLM
BP.H
). If the measured pressure
(
Pressures
AIR.P
BP
) is above the limit for 5 minutes,
then the alert will occur.
T314 (IAQ Above Limit) — If the unit is configured to use an
CO
2
sensor and the level (
Inputs
AIR.Q
IAQ
) is above the
configurable IAQ High Alert Limit (
Configuration
ALLM
IAQ.H
) for 5 minutes then the alert will occur. The
unit will continue to run and the alert will automatically reset.
Summary of Contents for Carrier Weathermaker 48A2
Page 105: ...105 Fig 20 Typical Main Control Box Wiring Schematic 48 50A2 A3 A4 A5 Units...
Page 106: ...106 Fig 21 Typical Auxiliary Control Box Wiring Schematic...
Page 107: ...107 Fig 22 Typical 2 Stage Gas Heat Wiring Schematic Size 060 Units Shown a48 8357...
Page 108: ...108 TO NEXT PAGE Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown A48 7296...
Page 109: ...109 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown cont A48 8358...
Page 110: ...110 Fig 24 Typical Electric Heat Control Schematic 50 Series Size 060 Units Shown a50 8228...
Page 111: ...111 Fig 25 Typical Power Schematic 48 50A2 A3 A4 A5 060 Unit Shown...
Page 112: ...112 Fig 26 Typical Low Ambient Controls Option Wiring...
Page 113: ...113 Fig 27 Typical Small Chassis Component Location Size 020 035 Units...
Page 114: ...114 Fig 28 Typical Large Chassis Component Locations Size 040 060 Units...
Page 118: ...118 Fig 30 Economizer Control Board ECB1 and VAV Control Board ECB2 A48 7706...
Page 142: ...142 A48 3733 Fig 56 Main Burner Removal...
Page 176: ...176 APPENDIX C VFD INFORMATION cont Fig F Internal Enclosure Fan Replacement A48 7716...
