Specifications

79
Table 50 — Alarm Codes (cont)
LEGEND
Suction Gas Thermistor
Alarm 11 — Circuit A (th.12)
Alarm 12 — Circuit B (th.13)
Criteria for Trip — This alarm criterion is tested whether the
unit is ON or OFF. If the suction gas temperature as measured
by the thermistor is outside of the range –40 to 245 F (–40 to
118.3 C).
Action to be Taken — The affected circuit shuts down
normally.
Reset Method — Automatic, once the thermistor reading is
within the expected range. The affected circuit will restart once
the alarm has cleared.
Possible Causes — If this condition is encountered, check the
following items:
• sensor wiring to the EXV board
• board for a faulty channel
• a faulty thermistor
See the Thermistors section on page 60 for thermistor descrip-
tion, identifiers and connections.
Circuit Discharge Gas Thermistor Sensor Failure
Alarm 14 — Circuit A (th.15)
Alarm 15 — Circuit B (th.16)
Criteria for Trip — This alarm criterion is tested whether the
unit is ON or OFF. The alarm is tripped if the temperature
measured by the Outdoor Air Thermistor sensor is outside the
range of –40 to 245 F (–40 to 118.3 C).
Action to be Taken — The unit shuts down normally, or is not
allowed to start.
Reset Method — Automatic, the alarm will reset once the
thermistor reading is within the expected range.
Possible Causes — If this condition is encountered, check the
following items:
• sensor wiring to the CPM board
• a faulty thermistor
• a faulty channel on the board
See the Thermistors section on page 60 for thermistor descrip-
tion, identifiers and connections.
Condenser Subcooling Liquid Thermistor
Alarm 17 — Circuit A (th.18)
Alarm 18 — Circuit B (th.19)
NOTE: Alarms 17 and 18 are not used or supported. If this
condition is encountered, confirm machine configuration.
Alarm 19 — Space Temperature Sensor Failure (th.21)
Criteria for Trip — This alarm criterion is checked whether the
unit is ON or OFF and if Space Temperature Reset has been
enabled. This alarm is generated if the outdoor-air temperature
as measured by the thermistor is outside of the range –40 to
245 F (–40 to 118.3 C).
Action to be Taken — Unit operates under normal control.
Temperature Reset based on Space Temperature is disabled.
Reset Method — Automatic, once the thermistor reading is
within the expected range. The Space Temperature Reset will
resume once the alarm has cleared.
Possible Causes — If this condition is encountered, check the
following items:
• sensor wiring to the Energy Management Module
PREFIX
CODE
SUFFIX
CODE
ALARM
NUMBER
ALARM DESCRIPTION REASON FOR ALARM
ACTION TAKEN
BY CONTROL
RESET
TYPE
PROBABLE CAUSE
A1, B1 10 132-10,
133-10
Compressor Y delta starter
current increase failure alarm
If the delta mode current
is not 25% greater than
the current in Y mode
Circuit shut down Manual Power supply to delta
contactor not
connected, faulty delta
contactor or wiring,
faulty CPM board
11 132-11,
133-11
Compressor Contactor failure CPM board detects
greater than 15% of MTA
current for 10 seconds
after shutting off the com-
pressor contactor. Oil
solenoid is energized.
Circuit shut down Manual Faulty contactor, con-
tactor welded, wiring
error
12 132-12,
133-12
Compressor Unable to stop
motor
CPM board detects
greater than 15% of MTA
current for 10 seconds
after three attempts
Circuit shut down Manual Faulty contactor,
contactor welded,
wiring error
13 132-13,
133-13
Compressor Phase reversal CPM board detects phase
reversal from current
toroid
Circuit shut down Manual Terminal block power
supply lead not in
correct phase. Power
supply leads going
through toroid crossed
14 132-14,
133-14
Compressor MTA configura-
tion fault
MTA setting is out of the
allowed MTA range
Circuit shut down Manual Incorrect MTA setting,
faulty CPM board
15 132-15,
133-15
Compressor Configuration
switch mismatch
CPM board MTA setting
do not match factory
configuration
Circuit shut down Manual Incorrect CPM dip-
switch setting,
incorrect factory MTA
setting, faulty CPM
board
16 132-16,
133-16
Compressor Unexpected
switch setting change
CPM board dipswitch S1
setting changed
Circuit shut down Manual Incorrect CPM dip-
switch setting, faulty
CPM board
17 132-17,
133-17
Compressor Power on reset CPM board detects a
power failure
Circuit shut down Manual Power supply
interruption
18 132-18,
133-18
Compressor UL 1998 critical
section software error
Software error Circuit shut down Manual Electric noise, faulty
CPM board
19 132-19,
133-19
Compressor UL 1998 current
measure dual channel
mismatch
Software error Circuit shut down Manual Electric noise, faulty
CPM board
CCN — Carrier Comfort Network
®
MBB — Main Base Board
CPM — Compressor Protection Module MLV — Minimum Load Valve
EMM — Energy Management Module MOP — Maximum Operating Pressure
EWT — Entering Water Temperature MTA — Must Trip Amps
EXV — Electronic Expansion Valve SST — Saturated Suction Temperature
HPS — High Pressure Switch UL — Underwriters Laboratories
LWT — Leaving Water Temperature