Specifications

75
Alarm 6 — Condenser Leaving Fluid (th.07)
Criteria for Trip — This alarm criterion is tested whether the
unit is on or off if the temperature as measured by the thermis-
tor is outside of the range –40 to 245 F (–40 to 118.3 C).
Action to be Taken — If the unit is in the cool mode (Heat/
Cool Status = 0) no action will be taken. If the unit is a heat
machine (Unit Type = 4) and if the unit is in heat mode (Heat/
Cool Status = 1), 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 Main Base Board
• sensor accuracy
See the Thermistors section on page 60 for thermistor descrip-
tion, identifiers and connections.
Condenser Reclaim Thermistor
Alarm 7— Reclaim Entering Fluid (th.08)
Alarm 8 — Reclaim Leaving Fluid (th.09)
NOTE: Alarms 7 and 8 are not used or supported. If this condi-
tion is encountered, confirm machine configuration.
Alarm 10 — Master/Slave Common Fluid Thermistor
(th.11)
Criteria for Trip — This alarm criterion is tested whether the
unit is ON or OFF. The alarm will be tripped if the unit is
configured as a master or a slave (Master/Slave Select,
MSSL), leaving temperature control is selected (Entering
Fluid Control, EWTO), and if the temperature measured by
the CHWS (chilled water sensor) fluid sensor is outside the
range of –40 to 245 F (–40 to 118.3 C).
Action to be Taken — Master/slave operation is disabled and
the chiller returns to stand alone mode.
Reset Method — Reset is automatic when the thermistor read-
ing is inside the range of –40 to 245 F (–40 to 118.3 C).
Possible Causes — If this condition is encountered, check the
following items:
• sensor wiring to the Main Base Board
• a faulty thermistor
See the Thermistors section on page 60 for thermistor de-
scription, identifiers and connections.
Table 50 — Alarm Codes
LEGEND
PREFIX
CODE
SUFFIX
CODE
ALARM
NUMBER
ALARM DESCRIPTION REASON FOR ALARM
ACTION TAKEN
BY CONTROL
RESET
TYPE
PROBABLE CAUSE
th 01 1 Cooler Entering Fluid
Thermistor
Temperature measured
by the controller is
outside of the range
of –40 F to 245 F
Unit be shut down or
not allowed to start
Automatic Faulty Sensor,
wiring error or failed
main base board
02 2 Cooler Leaving Fluid
Thermistor
03 3 Circuit A Defrost Thermistor None
Automatic
Configuration error
04 4 Circuit B Defrost Thermistor
06 5 Condenser Entering
Fluid Thermistor
Unit be shut down or
not allowed to start
Automatic Faulty Sensor,
wiring error or failed
main base board
07 6 Condenser Leaving
Fluid Thermistor
08 7 Reclaim Condenser
Entering Thermistor
None
Automatic
Configuration error
09 8 Reclaim Condenser
Leaving Thermistor
11 10 Master/Slave Common Fluid
Thermistor
Dual chiller deacti-
vated. Master and
slave machines
operate in stand-
alone mode
Automatic
Faulty Sensor,
wiring error or failed
main base board
12 11 Circuit A Suction Gas
Thermistor
Circuit shut down or
not allowed to start
Automatic
Faulty Sensor,
wiring error, failed
EXV or CPM board
13 12 Circuit B Suction Gas
Thermistor
15 14 Circuit A Discharge Gas
Thermistor
16 15 Circuit B Discharge Gas
Thermistor
18 17 Circuit A Condenser Sub-
cooling Liquid Thermistor
Not supported
Automatic
Configuration error
19 18 Circuit B Condenser Sub-
cooling Liquid Thermistor
21 19 Space Temperature
Thermistor
Alarm tripped
Automatic
Faulty Sensor, wiring
error, failed EMM
board
23 20 Cooler heater feedback
thermistor
None
Automatic
Configuration error
24 21 Circuit A Economizer Gas
Thermistor
Circuit economizer
function disabled
Automatic
Faulty Sensor,
wiring error, failed
EXV board
25 22 Circuit B Economizer Gas
Thermistor
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