Discharge Pipe Protection Control - Daikin RXYQ72 Serivce Manual

SiUS39-601
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>230˚F
or
Tp>239˚F
INV upper limit frequency:
1-step down from current
compressor frequency
Every 30 sec.
HTdi>230˚F
or
Tp>239˚F
HTdi>266˚F
HTdi>239˚F
or
for 90 sec.
or more.
Tp>266˚F
INV62 Hz + OFF
[STD compressor]
Discharge pipe temp.
protection control not limited
Function
Each compressor performs the discharge pipe temperature protection control individually in
the following sequence.
Discharge pipe temp.
protection control not limited
&
In discharge pipe temp.
protection control
or
Discharge pipe
temp.control standby
• HTds>239˚F continues for 5 min. or more.
• HTds>275˚F
or
• Tp>239˚F continues for 10 min. or more.
• Tp>266˚F
10 min.
HTdi : Value of INV compressor discharge pipe
Tp :
HTdi<203˚F
Tp<212˚F
Every 60 sec.
HTdi<221˚F
&
Tp<239˚F
HTdi>275˚F
HTdi>239˚F for 10 min. or more.
When occurring 3 times within 100 minutes,
the malfunction code "F3" is output.
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.
Applicable STD
compressor stops.
Protection Control
temperature (Tdi) compensated with
outdoor air temperature
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
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