Carrier 48AJ Operating And Service Manual page 88

ALARM
OR
ALERT
NUMBER
T300 Space Temperature Below Limit
T301 Space Temperature Above Limit
T302 Supply Temperature Below Limit
T303 Supply Temperature Above Limit
T304 Return Temperature Below Limit
T305 Return Temperature Above Limit
T308 Return Air Relative Humidity Below Limit
T309 Return Air Relative Humidity Above Limit
T310 Supply Duct Static Pressure Below Limit
T311 Supply Duct Static Pressure Above Limit
T312 Building Static Pressure Below Limit
T313 Building Static Pressure Above Limit
T314 IAQ Above Limit
A404 Fire Shut Down Emergency Mode (fire-smoke)
A405 Evacuation Emergency Mode
A406 Pressurization Emergency Mode
A407 Smoke Purge Emergency Mode
T408 Dirty Air Filter
A409 Supply Fan Status Failure
T409 Supply Fan Status Failure
T414 Loss of Communication with the Belimo Actuator
T414 Belimo Actuator Direction Error
T414 Belimo Actuator Failure
T414 Belimo Actuator Jammed
T414 Belimo Actuator Range Error
R-W1 Jumper Must Be Installed to Run Heat in Service
T420
Test
T421 Thermostat Y2 Input ON without Y1 ON
T422 Thermostat W2 Input ON without W1 ON
T423 Thermostat Y and W Inputs ON
T424 Thermostat G Input OFF on a Call for Cooling
T500 Current Sensor Board Failure - A1
T501 Current Sensor Board Failure - A2
T502 Current Sensor Board Failure - B1
T503 Current Sensor Board Failure - B2
A700 Supply Air Temperature Sensor Failure
T701 Staged Gas Thermistor 1 Failure
T702 Staged Gas Thermistor 2 Failure
T703 Staged Gas Thermistor 3 Failure
A704 Staged Gas Leaving Air Temp Sum Total Failure
T705 Limit Switch Thermistor Failure
LEGEND
A — Alarm
P — Pre-Alert
T — Alert
DIAGNOSTIC ALARM CODES AND POSSIBLE CAUSES
T051, P051 (Circuit A, Compressor 1 Failure)
T052, P052 (Circuit A, Compressor 2 Failure)
T055, P055 (Circuit B, Compressor 1 Failure)
T056, P056 (Circuit B, Compressor 2 Failure) — Alert codes
051, 052, 055, and 056 are for compressors A1, A2, B1, and
B2 respectively. These alerts occur when the Current Sensor
(CS) does not detect compressor current during compressor
operation. When this occurs, the control turns off the compres-
sor and logs a strike for the respective circuit. These alerts reset
automatically.
If the current sensor board reads OFF while the compressor
relay has been commanded ON for a period of 4 continuous
seconds, an alert is generated.
Any time this alert occurs, a strike will be called out on the
affected compressor. If three successive strikes occur the
compressor will be locked out requiring a manual reset or
power reset of the circuit board. The clearing of strikes during
Table 105 — Alert and Alarm Codes (cont)
DESCRIPTION ACTION TAKEN BY CONTROL
Stop cooling, but continue
to heat
Stop heating, but continue
to cool
Continue to run unit
Continue to run unit
Continue to run unit
Continue to run unit
Alert
Continue to run unit
Continue to run unit
Continue to run unit
Continue to run unit
Continue to run unit
Continue to run unit
Unit Shutdown
Run power exhaust
Run supply fan
Run supply and exhaust fans
Continue to run unit
Stop unit
Continue to run unit
Close economizer
Close economizer
Attempt to close economizer
Close economizer
Close economizer
No heat
Assume Y2 is Y1
Assume W2 is W1
Alert
Turn fan on
Stop compressor A1
Stop compressor A2
Stop compressor B1
Stop compressor B2
Stop staged gas heat
Stop staged gas heat
Stop staged gas heat
Stop staged gas heat
Stop staged gas heat
Stop staged gas heat
compressor operation is a combination of 3 complete cycles or
15 continuous minutes of run time operation. So, if there are
one or two strikes on the compressor and three short cycles
(ON-OFF, ON-OFF, ON-OFF) less than 15 minutes each
occur, the strikes will be reset to zero for the affected compres-
sor. Also, if the compressor turns on and runs for 15 minutes
straight with no compressor failure, the compressor's strikes
are cleared as well.
NOTE: Until the compressor is locked out, for the first two
strikes, the alert will not be broadcast to the network, nor will
the alarm relay be closed.
The possible causes are:
• High-pressure switch (HPS) open. The HPS-pressure
switch is wired in series with compressor relays on the
MBB. If the high-pressure switch opens during compressor
operation, the compressor stops, and the CS no longer
detects current, causing the control to activate this alert.
88
RESET
PROBABLE CAUSE
METHOD
Automatic Outdoor dampers stuck, no load
Automatic High load, dampers open
Dampers open, check configuration
Automatic
setpoint
Dampers open, check configuration
Automatic
setpoint
Dampers open, check configuration
Automatic
setpoint
Dampers open, check configuration
Automatic
setpoint
Automatic Configuration error, or sensor error
Dampers open, check configuration
Automatic
setpoint
Automatic VFD problem, broken fan belt
Automatic VFD problem, broken fan belt
Automatic Exhaust issues, check setpoint
Automatic Exhaust issues, check setpoint
Automatic Damper or IAQ control issues
Smoke detector switch or external
Automatic
switch
Automatic Special fire mode control
Automatic Special fire mode control
Automatic Special fire mode control
Automatic Dirty filter, switch setting
Automatic Fan drive failure
Automatic Fan drive failure, or sensor failure
Calibrate economizer, economizer
Automatic
failure, wiring
Automatic Motor direction switch wrong, wiring
Automatic Motor failure
Automatic Obstruction in damper
Automatic Calibrate economizer
Automatic Add red wire jumpers
Automatic Thermostat wiring error
Automatic Thermostat wiring error
Automatic Thermostat issues
Automatic Thermostat or wiring issues
Automatic Faulty board or wiring
Automatic Faulty board or wiring
Automatic Faulty board or wiring
Automatic Faulty board or wiring
Automatic Faulty sensor or wiring error
Automatic Faulty sensor or wiring error
Automatic Faulty sensor or wiring error
Automatic Faulty sensor or wiring error
Automatic Faulty sensor or wiring error
Automatic Faulty switch or wiring