Carrier AquaEdge 19DV series, Управление, эксплуатация и устранение неисправностей

Страница: 27 / 88

27
be ignored. When free cooling is in progress, chiller is not able
to start up.
Condenser Flush
Stagnant untreated water can result in corrosion. This option,
which typically is used for shipboard units, can flush the con-
denser to help mitigate this issue.
If
Option Configuration

Condenser Flush Alert is enabled,
when condenser pump has been not running for 7 days, alert
166 will be triggered to remind user to flush condenser. Acti-
vate condenser flush by enabling General Parameters

Start
Condenser Flush . Alert 166 will be reset automatically after
condenser flush is activated.
Condenser Flush will last for 2 hours and then end automatical-
ly. During Condenser Flush, the chiller will take these actions:
• Switch on the condenser water pump
• Open head pressure valve to maximum opening position
• Display Condenser Flush mode on the homepage.
Condenser Flush mode will only be activated when chiller is not
running. If the chiller is running, Condenser Flush start request
will be ignored. When free cooling is in progress, if chiller is
commanded to start during condenser flush it will automatically
end and chiller will start up normally.
DIAGNOSTICS AND TROUBLESHOOTING
The 19DV PIC6 control system has many fault tracing aid
functions. The local interface and its various menus give ac-
cess to all unit operating conditions.
If an operating fault is detected, an alarm is activated. The
alarm code is displayed in the Alarms menu, sub-menus Reset
alarms and Current alarms. The control may record up to 10
current alarms and alerts.
Alarm/Alert Codes
Table 15 lists PIC6 alert codes. Table 16 lists PIC6 alarm
codes. These do not cause machine shutdown and are typically
automatically reset when the situation returns to normal.
Displaying Alarms
The alarm icon on the interface (see the section Icons on
page 12) indicates unit status as follows:
• A flashing red LED shows that the unit is operating but
there is an alert.
• A steady red LED shows that the unit has been shut down
due to a fault.
The Reset Alarms option on the main menu displays up to five
alarm codes that are active on the unit. Table 16 lists alarm
codes.
Resetting Alarms
When the cause of the alarm has been identified and corrected,
the alarm can be reset either automatically or manually (de-
pending on the type of alarm). See Table 16 for alarms that are
eligible for automatic reset.
In the event of a power supply interrupt, if Auto Restart Option
is set to ENABLE in the Option Configuration menu, the unit re-
starts automatically without the need for an external command.
A manual reset must be run from the main menu via the Reset
Alarms Feature.
Once the alarm has been corrected or reset, all information re-
garding solved alarms is stored in the Alarm History. Alarm
History will store last 50 alarms even after alarms have been
corrected or reset.
Table 15 — PIC6 Alert Codes*
ALERT CODE
DESCRIPTION
OF ALARM TEXT
RESET TYPE
ACTION TAKEN BY
THE CONTROL
POSSIBLE CAUSE
ALT-100
Prestart Alert -
Starts Limit
Exceeded
Automatic when
the situation
comes back to
normal
Turn On Alert Relay
Check STARTS IN 12 HOURS in Run times screen. Enable the “Enable
Excessive Starts” option in “service” menu if additional start is required.
(Recycle restarts and auto restarts after power failure are not counted.)
ALT-101
Prestart Alert -
Low Oil
Temperature
Automatic when
the situation
comes back to
normal
Turn On Alert Relay
Check OIL SUMP TEMP in default screen.
Check oil heater contactor/relay and power.
Check Oil Sump Temperature Sensor wiring and accuracy.
Check oil level and oil pump operation.
Check EVAP SAT TEMP.
ALT-102
Prestart Alert -
High Condenser
Pressure
Automatic when
the situation
comes back to
normal
Turn On Alert Relay
Check CONDENSER PRESSURE.
Check Condenser Pressure transducer wiring and accuracy.
Check for high condenser water temperatures.
Check COND PRESS OVERRIDE in configuration
ALT-103
Prestart Alert -
Excessive
Recycle Starts
Automatic when
the situation
comes back to
normal
Turn On Alert Relay
Chiller load is too low to keep compressor on line and there has been
more than 5 starts in 4 hours. Increase chiller load, adjust ECV to open
at a higher load, increase recycle RESTART DELTA T in service menu.
Check ECV isolation valve position.
ALT-104
Prestart Alert -
Waiting For Start
Permission
Automatic when
the situation
comes back to
normal
Turn On Alert Relay
Check whether Power Request Option is enabled by mistake.
If the ship's power system not receive the power request signal, check
the connection of power request output.
If the ship's power system does not give the power permission signal,
check the ship's power system.
If the chiller does not receive the power permission signal, check the
connect of power permission input.
ALT-120
Sensor Alert -
Remote
Temperature Out
of Range
Automatic when
the situation
comes back to
normal
Alert Relay is ON
Type 2 Temperature Reset is Enabled and Remote Temperature Reset
sensor is out of range. Check ENABLE RESET TYPE and
TEMPERATURE RESET settings in TEMP_CNTL screen. Check
Remote Temperature Reset sensor resistance or voltage drop.
Check for proper wiring to CCM J4-13 & J4-14.
ALT-121
Sensor Alert -
Auto Water Temp
Reset
Automatic when
the situation
comes back to
normal
Alert Relay is ON
CheckTemp Reset Configuration
Confirm that Auto Water Temp Reset Input is between 4 mA and 20 mA.
Confirm that wiring to IOB connector is not grounded.
ALT-122
Sensor Alert -
Auto Demand
Limit Input
Automatic when
the situation
comes back to
normal
Alert Relay is ON
20mA DEMAND LIMIT OPT is Enabled, Ice Build is not Active, and Auto
Demand Limit Input on IOB is < 2 mA. Check 20 mA DEMAND LIMIT
OPT and DEMAND LIMIT AT 20 mA in Service screen. Confirm that
Auto Demand Limit Input is between 4 mA and 20 mA. Confirm that
wiring to IOB connector is not grounded.