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3.3.1 Automatic PTI Step No. and Contents
During PTI operation, Step No, contents, and select PTI (Short, Full, Chilled or Frozen) will be displayed.
Step No.
P00
Basic data record
P02
Alarm check on all sensors
P03
EFM check
P04
RS & SS accuracy check
P06
HPT & LPT accuracy check
P08
INV check
P10
ESV & EMV check
P12
LSV check
P14
HSV check
P16
RSV check
P18
DMV check
P20
HPS check
P22
Pump down check
P24
HSV, RSV & ESV check
P50
Pull-down check
P60
0℃ control
P70
Defrost operation check
P80
Pull-down speed check
P90
-18℃ control
3.3.2 Automatic PTI Alarm
Alarm code T＊＊＊ is displayed for Automatic PTI.
Step
Contents
No.
Basic data
P00
check
Alarm
Same as
P02
check on
all sensors
operation
EFM
P03
check
RS, SS
P04
check
HPT, LPT
P06
check
INV
P08
check
Contents
Alarm
Conclusion
code
No
No conclusion
alarm
Same as normal
normal
operation
EFM operation current is
T031
large at high and low speed.
EFM operation current
T032
is small at high and low
speed. (Broken wire?)
The temperature difference
of SS and DSS is large.
T041
The temperature difference
of RS and DRS is large.
The pressure
T061
difference of HPT
and LPT is large.
The frequency does not
T081
match to command frequency.
No pressure difference
T082
between high and low pressure.
Short PTI
Full PTI
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
Possible cause
Same as normal
operation
Faulty motor coil
Faulty operation of
magnetic contactors
EFM wiring fault
SS Failure
RS Failure
HPT Failure
LPT Failure
3-6
Chilled PTI
Frozen PTI
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
Check method
Same as normal
operation
Check motor coil
Check of magnetic
contactors operation
Check wiring
Compare the SS with the
DSS on the control panel.
Compare the RS with the
DRS on the control panel.
Compare the high-pressure value
between HPT and manifold gauge.
Compare the low-pressure value
between LPT and manifold gauge.
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