Troubleshooting; Alarms And Alerts; Diagnostic Alarm Codes And Possible Causes - Carrier AQUAFORCE 30XA080-500 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

Every month:
• Check condenser coils for debris; clean as necessary with
Carrier approved coil cleaner.
• Check moisture indicating sight glass for possible refriger-
ant loss and presence of moisture.
Every 3 months (for all machines):
• Check refrigerant charge.
• Check all refrigerant joints and valves for refrigerant leaks;
repair as necessary.
• Check chilled water flow switch operation.
• Check all condenser fans for proper operation.
• Check oil filter pressure drop.
• Check oil separator heater operation.
• Inspect pump seal, if equipped with a hydronic pump package.
Every 12 months (for all machines):
• Check all electrical connections; tighten as necessary.
• Inspect all contactors and relays; replace as necessary.
• Check accuracy of thermistors; replace if greater than ±2° F
(1.2° C) variance from calibrated thermometer.
• Check accuracy of transducers; replace if greater than ±5 psi
(34.47 kPa) variance.
• Check to be sure that the proper concentration of antifreeze
is present in the chilled water loop, if applicable.
• Verify that the chilled water loop is properly treated.
• Check refrigerant filter driers for excessive pressure drop;
replace as necessary.
• Check chilled water strainers, clean as necessary.
• Check cooler heater operation.
• Check condition of condenser fan blades and that they are
securely fastened to the motor shaft.
• Perform Service Test to confirm operation of all components.
• Check for excessive cooler approach (Leaving Chilled
Water Temperature – Saturated Suction Temperature) which
may indicate fouling. Clean cooler vessel if necessary.
• Obtain oil analysis; change as necessary.

TROUBLESHOOTING

See Table 58 for an abbreviated list of symptoms, possible
causes and possible remedies.
Alarms and Alerts —
stantly monitors the unit and generates warnings when abnor-
mal or fault conditions occur. Alarms may cause either a circuit
(Alert) or the whole machine (Alarm) to shut down. Alarms
and Alerts are assigned codes as described in Table 59. The
alarm/alert indicator LED on the Navigator™ module is illu-
minated when any alarm or alert condition is present. If an
Alert is active, the Alarm Indicator LED will blink. If an Alarm
is active, the Alarm Indicator LED will remain on. Currently
active Alerts and Alarms can be found in (Current Alarm,
ALRM).
The controller generates two types of alarms. Automatic
reset alarms will reset without any intervention if the condition
that caused the alarm corrects itself. Manual reset alarms
require the service technician to check for the alarm cause and
The integral control system con-
reset the alarm. The following method must be followed to
reset manual alarms:
Before resetting any alarm, first determine the cause of the
alarm and correct it. To reset the alarm, set R.ALM to YES.
The alarms will be reset. Indicator light will be turned off when
switched correctly. Do not reset the chiller at random without
first investigating and correcting the cause(s) of the failure.
Each alarm is described by a three or four-digit code. The
first one or two digits indicate the alarm source and are listed in
Fig. 62. The last two digits pinpoint the problem. See Table 59.
Alarm Descriptor
Alarm Prefix
A1 – Compressor A1 Failure
B1 – Compressor B1 Failure
C1 – Compressor C1 Failure
Co – Communication Failure
FC – Factory Configuration Error
MC – Master Chiller Configuration Error
P – Process Failure
Pr – Pressure Transducer Failure
Sr – Service Notification
th – Thermistor Failure
Alarm Suffix
Code Number to identify source
Fig. 62 — Alarm Description
DIAGNOSTIC ALARM
CAUSES
Thermistor Failure
Alarm 1 — Cooler Fluid Entering (th.01)
Alarm 2 — Cooler Fluid Leaving (th.02)
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 — 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 71 for thermistor de-
scription, identifiers and connections.
Defrost Thermistor Failure
Alarm 3 — Circuit A (th.03)
Alarm 4 — Circuit B (th.04)
NOTE: These alarms are not used or supported. If this con-
dition is encountered, confirm machine configuration.
88
Alarm
th .01
a30-4250
CODES AND POSSIBLE