Discharge Pipe Protection Control - Daikin VRVIII-S Service Manual

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