Daikin VRVIII-S, Service Manual

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Protection Control SiENBE34-703
54 Function
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]
When occurring 3 times within 100 minutes,
the malfunction code “F3” is output.
HTdi>115°C
Tp>135°C
or
HTdi>115°C
Tp>135°C
HTdi<110°C
Tp<125°C
&
After 30 sec.
HTdi<100°C
Tp<110°C
&
Discharge pipe
temperature standby
HTdi>135°C
HTdi>120°C for 10 min. or more.
or
36 Hz Unload
After 20 sec.
HTdi>130°C
HTdi>120°C
for 90 sec.
or more.
or
or
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.
INV upper limit frequency: 1-step up
from current compressor frequency
Discharge pipe protection
control not limited
INV upper limit frequency:
1-step down from current
compressor frequency
In discharge pipe temp.
protection control