American Standard 4A6V8024A1000B, Service Facts

Page: 27 / 76

4A-V8-SF-1G-EN 27
Alert
Code
Alert
Group
Display
Assembly
Text
Sub-
alar-
m
A/TZONE
850/950
State action on
occurrence
State action on
clearance
Alert
Description
Possible Cause
179
Power
Module
Tempera-
ture
Failure
REC TEMP DER 0
N/A
Compressor speed
Derated.
Ramp up to
demand speed
(normal operation).
Rectifier
temperature
greater than the
Derate threshold
High Load condition,
heat sink
performance loss
(check thermal
grease, cold plate
torque)
REC T EX DER 1 Err 179.01
Compressor speed
Derated. This alert
shall be an indication
of an extended
Derated performance.
Ramp up to
demand speed
(normal operation).
Rectifier
temperature
greater than the
Derate threshold
and the system is
being Derated for
an extended
period of time
High Load condition,
heat sink
performance loss
(check thermal
grease, cold plate
torque) possible
Drive hardware
failure (Run Drive
diagnostics)
REC TEMP LO 2 Err 179.02
Emergency shutdown
Can be cleared only
on power cycle.
After power cycle,
the compressor
shall resume
normal operation.
Rectifier
temperature
greater than the
shutdown
threshold
High Load condition,
heat sink
performance loss
(check thermal
grease, cold plate
torque) possible
Drive hardware
failure (Run Drive
diagnostics) Call for
tech support, record
failure mode for
warranty claim before
replacing Drive.
INV TEMP DER 3
N/A
Compressor speed
Derated.
Ramp up to
demand speed
(normal operation).
Inverter
temperature
greater than the
Derate threshold
High Load condition,
heat sink
performance loss
(check thermal
grease, cold plate
torque)
INV T EX DER 4 Err 179.04
Compressor speed
Derated. This alert
shall be an indication
of an extended
Derated performance.
Ramp up to
demand speed
(normal operation).
Inverter
temperature
greater than the
Derate threshold
and the system is
being Derated for
an extended
period of time
High Load condition,
heat sink
performance loss
(check thermal
grease, cold plate
torque) possible
Drive hardware
failure (Run Drive
diagnostics)
INV TEMP LO 5 Err 179.05
Emergency shutdown
Can be cleared only
on power cycle.
After power cycle,
the compressor
shall resume
normal operation.
Inverter
temperature
greater than the
shutdown
threshold
High Load condition,
heat sink
performance loss
(check thermal
grease, cold plate
torque) possible
Drive hardware
failure (Run Drive
diagnostics) Call for
tech support, record
failure mode for
warranty claim before
replacing Drive.
180
Supply
Voltage
Failure
HI PWR DER 0
N/A
Compressor speed
Derated.
Ramp up to
demand speed
(normal operation).
Low supply
voltage and/or
high power
output from Drive
-compressor
running at a
reduced RPM
(Derate)
Maximum power is
reduced with line
voltage less than
200VAC. High load
conditions,
recirculation, dirty
coils, low airflow
LOW VOLT CO 2 Err 180.02
Emergency shutdown.
Control will clear the
fault and retry every 5
minutes.
Resume normal
operation
Supply voltage is
less than 175VAC Supply voltage is less
than 175VAC
V Va arriia ab blle e S Sp pe ee ed d A Alle errtt C Co od de ess