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SiUS28-902_B
Protection Control
Function
25
4.3
Discharge Pipe Protection Control
HTdi: Value of INV. compressor discharge pipe temperature (Tdi) compensated with outdoor air
temperature
Tp: Value of compressor port temperature calculated by Tc and Te, and suction superheated
degree.
This discharge pipe protection control is used to protect the compressor internal temperature
against an error or transient increase of discharge pipe temperature.
[INV. compressor]
OR
When occurring 3 times within 100 min., the
error code "
F3
" is output.
•
HTdi > 275˚F
•
HTdi > 248˚F for 10 min. or more.
Discharge pipe
temp. control standby
OR
OR
30 sec.
In discharge pipe protection control
&
&
OR
OR
&
Discharge pipe protection control not limited
Keep the current step
Inverter frequency 1-step down from
current compressor frequency
(lower limit: 57Hz)
Inverter upper limit frequency:
1-step up from current compressor
frequency
Exclusion of
the right
conditions
Fix Inverter frequency 57Hz
• Defrost operation
(preparation ~ post operation)
• Oil return operation in heating
(preparation ~ post operation)
• Oil return operation in cooling
(without preparation and post operation)
•
HTdi < 203˚F
•
Tp < 212˚F
•
Inverter upper limit Frequency.
• Not during defrost operation
(preparation ~ post operation)
• Not during oil return operation in heating
(preparation ~ post operation)
• Not during oil return operation in cooling
(without preparation and post operation)
•
HTdi > 221˚F
•
Tp > 266˚F
•
HTdi > 230˚F
•
Tp > 266˚F
Cooling: 20 sec.
Heating: 60 sec.
•
HTdi < 212˚F
•
Tp < 239˚F
•
HTdi > 266˚F
•
HTdi > 239˚F for 90sec. or more
•
Tp > 284˚F