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Chiller/Heater Troubleshooting
General Approach to Fault
Isolation
Trane manufactures chillers with embedded fault
detection and diagnostics in each module's controller that
offers continuous dedicated monitoring to record and
report faults as they occur in real time allowing repairs to
be performed in a timely manner.
Various faults occurring in a building's HVAC system can
lead to unnecessary energy consumption and poor
thermal comfort for a building's occupants. Fault detection
and isolation plays a significant role in monitoring,
maintaining, and repairing chillers to improve operator
safety and minimize operating costs.
Fault detection is recognizing that a problem has occurred,
even if the root cause is not yet known. Fault isolation is the
process of reducing potential causes to determine the
most likely source of chiller failure
Controller Diagnostic Codes
Compressors used in Trane systems are highly automated
with digital capability to record and report a range of
operating parameters and critical events. This technology
can be employed to assist in troubleshooting compressor
faults and potential corrective action.
Compressor Flash Codes
The technology in the Trane compressor will communicate
an abnormal system condition through a unique flash
code:
ALERT LED (Yellow): The ALERT LED will flash a number
of times consecutively, pause and then repeat the process.
The number of consecutive flashes, defined as the flash
code, correlates to a specific anomaly or abnormal
condition.
TRIP/LOCK LED (Red): indicates either a TRIP or LOCK
condition.
•
TRIP is indicated by a solid illumination of the LED.
This means the compressor is not running and
demand is present at the module.
•
LOCK is indicated by a flashing LED correlating to a
lock condition in which the module will prevent the
compressor from starting.
Flash Code Description
Compressors will report a range of flash codes when
specific critical events occur. See the following table.
CODE 1 – Long Run Time: The module will flash yellow
one time when the compressor operates for longer than 18
continuous hours. This is an alert code only and the
module will not lockout the compressor for this condition.
(This code is inactive for heat pumps.)
62
CODE 2 – Compressor (Pressure) Trips: The module will
flash yellow two times when the compressor operates
from 12 seconds to 15 minutes followed by a trip condition
lasting longer than 7 minutes. When four consecutive or
ten total code 2 events are recorded, the module will
lockout the compressor and flash red two times.
CODE 3 – Pressure Switch Cycling: The module will flash
yellow three times when the compressor operates from 12
seconds to 15 minutes followed by a trip condition lasting
between 35 seconds to 7 minutes. When four consecutive
or ten total CODE 3 events are recorded, the module will
lockout the compressor and flash red three times.
CODE 4 – Locked Rotor Trip: The module will flash yellow
four times when the compressor trips within 12 seconds of
operation and does not reset and start within 35 seconds.
When ten consecutive CODE 4 events are recorded the
module will lockout the compressor and flash red four
times.
CODE 5 – Compressor (Moderate Run) Trip: The module
will flash yellow five times when the compressor has
operated between 15 minutes and 18 hours, followed by a
compressor trip lasting longer than 7 minutes. When four
consecutive or ten total CODE 5 events are recorded, the
module will lockout the compressor and flash red five
times.
CODE 6 – Open Start Circuit: The module will lockout the
compressor and flash red six times if the module detects
a demand signal in the Y terminal and current in the R
winding of the compressor, but no current is detected in
the s winding of the compressor for 2 seconds.
CODE 7 – Open Run Circuit: The module will lockout the
compressor and flash red seven times if the module
detects a demand signal in the Y terminal and current in
the S winding of the compressor, but no current is detected
in the R winding of the compressor for 2 seconds.
CODE 8 – Welded Contactor: The module will flash yellow
eight times if it has detected line currents in the S and R
windings and demand is absent for 15 seconds.
CODE 9 – Low Voltage: The module will flash nine times
if the module supply voltage drops below 17 Vac for 2
seconds. The module will prevent the compressor from
starting until adequate voltage is established.
CODE 10 – Over-Current Protection: When the current at
the PORT terminal is greater than 2A for 40 milliseconds,
the module will flash a CODE 10. The red LED will flash 10
times with the yellow LED remaining OFF. This event will
cause a lockout of the compressor and indicates that the
module is mis-wired or the contactor coil is shorted to
ground.
The following table assists in explaining the alarm codes
that appear in the remote interface panel in the event of an
alarm. The alarm history is accessed by pressing the alarm
log key. See the following table.
ARTC-SVX005A-EN
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