Daikin D-Series - Discharge Pipe Protection Control

Si18-525B Protection Control
Function 123
4.3 Discharge Pipe Protection Control
This discharge pipe protection control is used to protect the compressor internal temperature
against a malfunction or transient increase of discharge pipe temperature.
INV compressor
Discharge pipe
temp.control standby
HTdi>135˚C
HTdi>115˚C for 10 min. or more.
or
When occurring 3 times within 100 minutes,
the malfunction code "F3" is output.
(V3177)
• HTdi<95˚C
or
• Defrost operation
(preparation ~ post operation)
• Oil return operation in heating
(preparation ~ post operation)
• Oil return operation in cooling
(without preparation and post operation)
•
Tp<100˚C
or
30 sec.
• 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 opeation)
•
Tp>130˚C
• HTdi>105˚C
In discharge pipe protection control
&
&
• Tp>130˚C
• HTdi>110˚C
or
• HTdi>115˚C for 90sec. or more
• Tp>140˚C
• HTdi>130˚C
or
Cooling: 20 sec.
Heating: 60 sec.
•
Tp<115˚C
• HTdi<100˚C
&
Discharge pipe protection control not limited
Keep the current step
INV frequency 1-step down from
current compressor frequency
(lower limit: 52Hz)
INV upper limit frequency:
1-step up from current
compressor frequency
Exclusion of
the right
conditions
Fix INV frequency 52Hz
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.