Daikin VRV III RXYQ5-54PY1, Service Manual

Page: 131 / 398

Protection Control Si34-601A
120 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.
★
Each compressor performs the discharge pipe temperature protection control individually
in the following sequence.
[INV compressor]
[STD compressor]
In discharge pipe temp.
protection control
HTdi>115˚C
Tp>135˚C
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.
or
Normal operation
INV upper limit frequency:
1-step down from current
compressor rps
INV upper limit frequency: 1-step up
from current compressor frequency
RXYQ5PY1: 52 Hz
Other models:
INV62 Hz + OFF + OFF
HTdi>115˚C
Tp>135˚C
or
HTdi>135˚C
HTdi>120˚C for 10 min. or more.
or
HTdi<110˚C
Tp<125˚C
&
After 30 sec.
After 20 sec.
HTdi>130˚C
HTdi>120˚C
for 90 sec.
or more.
Tp>130˚C
or
HTdi<100˚C
Tp<110˚C
&
When occurring 3 times within 100 minutes,
the malfunction code “F3” is output.
Discharge pipe
temperature standby (for
a period of 10 minutes)
• HTds>120˚C continues for 5 min. or more.
• HTds>135˚C
• Tp>135˚C continues for 10 min. or more.
• Tp>145˚C
or
Applicable STD
compressor stops.
After 10 min.
Discharge pipe temp.
protection control not limited
HTds : Value of STD compressor discharge
pipe temperature ( Tds) compensated
with outdoor air temperature
Tp : Value of compressor port temperature
calculated by Tc and Te , and suction
superheated degree.