Fujitsu FO20R Series Installation Instructions Manual page 55

9.5 Active Protection Fault Details (cont.)
IMPORTANT:
protection must be manually reset.
L16 – Com/DSP Comm Fault – A920_O Inverter
Fault
If the inverter identifies a communication with the
DSP (digital signal processor), the inverter will
automatically shut the compressor off and keep it
from operation. If this fault occurs 3 times during
one call for operation the VSODC will lock out the
compressor to keep it from continuing to operate
and flash an "L" on the dual 7-segment LEDs
followed by a 16.
IMPORTANT:
protection must be manually reset.
L16 – PFC Temperature Sensor Open – A921_O
Inverter Fault
If the inverter identifies an open power factor
correction (PFC) temperature thermistor the
inverter will automatically shut the compressor off
and keep it from operation. The VSODC will lock
out the compressor to keep it from continuing to
operate and flash an "L" on the dual 7-segment
LEDs followed by a 16.
IMPORTANT:
protection must be manually reset.
L16 – Discharge Line Temperature Fault –
A927_O Inverter Fault
If the inverter identifies a faulty discharge
line temperature thermistor the inverter will
automatically shut the compressor off and keep
it from operation. The VSODC will lock out the
compressor to keep it from continuing to operate
9.0 DIAGNOSTICS & TROUBLESHOOTING
This mode of active
This mode of active
This mode of active
and flash an "L" on the dual 7-segment LEDs
followed by a 16.
IMPORTANT:
protection must be automatic reset once the
discharge line thermistor fault is corrected.
L16 – Discharge Temperature – T916_O Inverter
Fault
If the VSODC detects the compressor discharge
temperature is greater 235°F [113ºC] the VSODC
will automatically begin to slow the compressor
operation until the temperature is 200°F [93ºC].
If this fold back is not successful in bringing the
compressor discharge temperature below 200°F
prior to reaching the minimum compressor speed
then the compressor will be kept from operating.
After the compressor off delay is complete the
VSODC will return the compressor to operation.
If this fault occurs 3 times during one call for
operation the VSODC will lock out the compressor
to keep it from continuing to operate and flash an
"L" on the dual 7-segment LEDs followed by a 16.
IMPORTANT:
protection must be manually reset.
L16 – Communication Failure – A929_O Inverter
Fault
If the inverter identifies a communication error with
the VSODC, the inverter will automatically shut
the compressor off and keep it from operation.
When this fault occurs the VSODC will lock out the
compressor to keep it from operating and flash an
"L" on the dual 7-segment LEDs followed by a 16.
IMPORTANT:
protection must be manually reset.
This mode of active
This mode of active
This mode of active
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