Discharge Pipe Protection Control - Daikin ALTHERMA HT ERSQ 011 AA 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 [R-410A]
Discharge pipe protection
control not limited
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
INV compressor [R-134a]
HTdi>115°C
INV upper limit frequency:
1-step down from current
compressor frequency
or HTdi>115°C
HTdi>130°C
or
HTdi>120°C for more than
90 sec.
66
HTdi<100°C
&
Tp<110°C
After 30 sec.
In discharge pipe temp.
protection control
HTdi>135°C
or
HTdi>120°C for 10 min. or more.
Discharge pipe
temperature standby
Discharge pipe protection
control not limited
After 30 sec.
In discharge pipe temp.
protection control
frequency match
min frequency
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
superheated degree.
HTdi<110°C
&
Tp<125°C
INV upper limit frequency: 1-step up
from current compressor frequency
After 20 sec.
When occurring 3 times within 100 minutes,
the malfunction code "F3" is output.
HTdi :
HTdi<100°C
or
max INV freq = max RPS for each HP
HTdi<110°C
After 20 sec.
HTdi<100°C
and
within 10 min after defrosting
After 20 sec.
HTdi>135°C
or
HTdi>120°C for 10 min. or more
When occurring 3 times within 100 minutes,
the malfunction code "F3" is output.
Value of INV compressor discharge pipe
temperature (Tdi) compensated with outdoor
air temperature
INV upper limit frequency: 1-step up
from current compressor frequency
INV upper limit frequency: 3-step up
from current compressor frequency
ESIE09-08A
Function