Discharge Pipe Protection Control - Daikin R-410A Service Manual

SiBE39-402A
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]
• HTdi>105°C
&
• Tp>130°C
• Not during defrost operation
(preparation ~ post operation)
or
• Not during oil return operation in heating
(preparation ~ post operation)
• Not during oil return operation in cooling
(without preparation and post opeation)
In discharge pipe protection control
INV frequency 1-step down from
current compressor frequency
(lower limit: 52Hz)
Exclusion of
the right
conditions
Function
Discharge pipe protection control not limited
HTdi>110°C
•
30 sec.
or
• Tp>130°C
Keep the current step
•
•
or
•
Fix INV frequency 52Hz
or
Discharge pipe temp.
control standby
HTdi: Value of INV compressor discharge pipe
Tp:
•
&
•
• Defrost operation
(preparation ~ post operation)
or
• Oil return operation in heating
(preparation ~ post operation)
• Oil return operation in cooling
(without preparation and post operation)
INV upper limit frequency:
1-step up from current
compressor frequency
Cooling: 20 sec.
Heating: 60 sec.
HTdi>130°C
HTdi>115°C for 90sec. or more
Tp>140°C
HTdi>135°C
HTdi>115°C for 10 min. or more.
When occurring 3 times within 100 minutes,
the malfunction code "F3" is output.
Protection Control
temperature (Tdi) compensated with
outdoor air temperature
Value of compressor port temperature
calculated by Tc and Te, and suction
superheated degree.
HTdi<95°C
Tp<100°C
HTdi<100°C
•
&
• Tp<115°C
(V3177)
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