Trane Tracer ZN524, Installation Owner Diagnostics

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34 CNT-SVX11A-EN
Troubleshooting
Diagnostics
Fan Failure
A “Low Air Flow—Fan Failure” diagnos-
tic is generated when a fan status
device is present and fails to close after
1 minute of unit start-up or when it
opens for more than 1 minute during
normal unit operation.
Space Temperature Failure
If the Tracer ZN524 has validated a
space temperature input and then the
input becomes invalid, a space temper-
ature failure diagnostic occurs.
Entering Water Temperature Failure
If the Tracer ZN524 has validated an
entering water temperature input and
then the input becomes invalid, an
entering water temperature failure diag-
nostic occurs.
Discharge Air Temperature Limit
When the discharge air exceeds the low
limit setpoint and the unit can not cor-
rect it by altering capacity, a “Discharge
Air Temp Limit” diagnostic is generated.
Outdoor Air Temperature Failure
If the Tracer ZN524 has validated an
outdoor air temperature input and then
the input becomes invalid, an outdoor
air temperature failure diagnostic
occurs.
Humidity Input Failure
If the Tracer ZN524 has validated a rela-
tive humidity input and then the input
becomes invalid, a humidity input fail-
ure diagnostic occurs.
CO
2
Sensor Failure
If the Tracer ZN524 has validated a CO 2
input and then the input becomes
invalid, a CO
2 input failure diagnostic
occurs.
Generic AIP Failure
If the Tracer ZN524 has validated a
generic analog input and then the input
becomes invalid, a generic analog input
failure diagnostic occurs.
Defrosting-Compressor Lockout
The defrost stat used with Tracer ZN524
on DX units is wired in series with the
condensing unit. When it opens to indi-
cate a frost condition, the Tracer ZN524
senses the open circuit and de-ener-
gizes the compressor output. A defrost-
ing diagnostic is generated at this
point.
Maintenance Required
Note: If power to the unit is cycled
or discontinued for any reason, all
maintenance timers are automati-
cally reset.
The “Maintenance Required” diagnostic
is generated when the fan run-time
exceeds the configurable limit. This
diagnostic is useful for filter change
notification.
Local Fan Mode Failure
If the hardwired fan mode input to the
Tracer ZN524 controller is present and
then becomes invalid, a local fan mode
failure diagnostic is generated.
Local Setpoint Failure
If the hardwired setpoint input to the
Tracer ZN524 controller is present and
then becomes invalid, a local setpoint
failure diagnostic is generated.
Generic Temperature Failure
If the Tracer ZN524 has validated a
generic temperature input and then the
input becomes invalid, a generic tem-
perature input failure diagnostic occurs.
Invalid Unit Configuration
If the Tracer ZN524 has been configured
improperly or loses its configuration,
an invalid unit configuration diagnostic
is generated. The unit must be re-con-
figured with a valid configuration to
correct this problem.