Carrier AquaSnap 30MPA Series Controls, Start-Up, Operation, Service, And Troubleshooting page 61

ALARM/ ALARM
ALERT OR DESCRIPTION
CODE ALERT
Circuit A Low Cooler
A116 Alarm
Suction Temperature
High Discharge Gas Tem-
P118 Pre-Alert
perature
High Discharge Gas Tem-
T118 Alert
perature
High Pressure Switch
A122 Alarm
Trip Circuit A
Circuit A High
A126 Alarm
Head Pressure
Circuit A Low Suction
A133 Alarm
Pressure
Reverse Rotation
A140 Alert
Detected
A150 Alarm Emergency Stop
A151 Alarm Illegal Configuration
Unit Down Due to
A152 Alarm
Failure
Real Time Clock
T153 Alert
Hardware Failure
Serial EEPROM
A154 Alarm
Hardware Failure
Serial EEPROM
T155 Alert
Storage Failure
Critical Serial EEPROM
A156 Alarm
Storage Failure
A157 Alarm A/D Hardware Failure
Loss of Communication
A172 Alarm
with EXV Board
Loss of Communication
T173 Alert
with EMM
4 to 20 mA Cooling Set
T174 Alert
Point Input Failure
Loss of Communication
A175 Alarm
with AUX Board
4 to 20 mA
T176 Alert Temperature Reset
Input Failure
See legend on page 63.
Table 54 — Alarm and Alert Codes (cont)
WHY WAS THIS
ALARM
GENERATED?
Mode 7 caused the com-
pressor to unload 3 consecu-
tive times with less than a Circuit shut down
30-minute interval between
each circuit shutdown.
Digital compressor enabled This is a non-broadcast
(A1.TY) and discharge gas alarm.
temperature greater than Compressor A1 is shut
268 F (131.1 C) down.
Digital compressor enabled
(A1.TY) and discharge gas Compressor A1 is shut
temperature greater than down.
268 F (131.1 C)
High Pressure A Switch
Circuit shut down
Input open to MBB
SCT >Maximum condensing
temperature from operating
envelope Circuit shut down
Operation outside compres-
sor operating envelope
Suction pressure below
34 psig for 8 seconds or Circuit shut down
below 23 psig
Incoming chiller power leads Chiller not allowed to
not phased correctly start.
CCN emergency stop
Chiller shut down.
command received
One or more illegal Chiller is not allowed to
configurations exists. start.
Both circuits are down due Chiller is unable
to alarms/alerts. to run.
Occupancy schedule
will not be used. Chiller
Internal clock on MBB fails
defaults to Local On
mode.
Chiller is unable
Hardware failure with MBB
to run.
Configuration/storage
No Action
failure with MBB
Configuration/storage Chiller is not allowed
failure with MBB to run.
Hardware failure with Chiller is not allowed
peripheral device to run.
MBB loses communication Chiller is not allowed
with EXV board to run.
4 to 20 mA
temperature reset
MBB loses communication disabled. Demand
with EMM Limit set to 100%. 4 to
20 mA set point
disabled.
If configured with EMM and Set point function
input less than 2 mA or disabled. Chiller
greater than 22 mA controls to CSP1.
MBB losses communication
Digital control is disabled. Automatic
with AUX board
Reset function
If configured with EMM
disabled. Chiller
and input less than 2 mA or
returns to normal set
greater than 22 mA
point control.
61
ACTION TAKEN RESET
BY CONTROL METHOD
Manual
Automatic, when
discharge tempera-
ture is less than
250 F (121.1 C).
Manual
Manual
Automatic, only
after first 3 daily
occurrences.
Manual reset
thereafter. SCT
must drop 5 F
(2.8 C) before
restart
Automatic
restart after first
daily occurrence.
Manual restart
thereafter.
Manual
Automatic once
CCN command for
EMSTOP returns to
normal
Manual once
configuration errors
are corrected
Automatic once
alarms/alerts are
cleared that pre-
vent the chiller from
starting.
Automatic when
correct clock con-
trol restarts.
Manual
Manual
Manual
Manual
Automatic
Automatic
Automatic
Automatic
PROBABLE
CAUSE
Faulty expansion valve, low
refrigerant charge, plugged
filter drier, faulty suction
pressure transducer, low
cooler fluid flow
Circuit overcharged, faulty
discharge temperature
thermistor
Circuit overcharged, faulty
discharge temperature
thermistor
Faulty transducer/high
pressure switch.
Plugged filter drier unit oper-
ating outside of range. Faulty
transducer/high pressure
switch overcharged, low/
restricted condenser
airflow (30MPA) low or loss of
condenser flow (30MPW),
fouled condenser (30MPW),
faulty EXV.
Faulty or plugged TXV or
EXV, low refrigerant charge,
TXV out of adjustment, liquid
line valve partially closed.
Plugged filter drier. Low
cooler flow.
Reverse any two incoming
power leads to correct. Check
for correct fan rotation first.
CCN Network
command.
Configuration error.
Check unit settings.
Alarm notifies user
that chiller is 100%
down.
Time/Date/Month/
Day/Year not
properly set.
Main Base Board
failure.
Potential failure of
MBB. Download
current operating
software. Replace
MBB if error occurs again.
Main Base Board
failure.
Main Base Board
failure.
Wiring error, faulty wiring or
failed EXV board.
Wiring error, faulty
wiring or failed
Energy Management Module
(EMM).
Faulty signal
generator, wiring
error, or faulty EMM.
Wiring error, faulty wiring,
failed AUX board, ditital
option enabled, Configura-
tion→Unit→AI.TY=YES
Faulty signal
generator, wiring
error, or faulty EMM.