Discharge Pipe Protection Control - Daikin REYQ72 Serveice Manual

SiUS39-602
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
temperature (Tdi) compensated with
outdoor air temperature
Tp : Value of compressor port temperature
calculated by Tc and Te, and suction
HTdi<203˚F
superheated degree.
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
INV upper limit frequency: 1-step up
from current compressor frequency
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