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Daikin VRV III-S RXYMQ36 48PVJU Service Manual: Discharge Pipe Protection Control

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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>239˚F
or
Tp>275˚F
INV. upper limit frequency:
1-step down from current
compressor frequency
HTdi>239˚F
or
Tp>275˚F
HTdi>266˚F
HTdi>248˚F
or
for 90 sec.
or more.
36 Hz Unload
44
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<212˚F
superheated degree.
Tp<230˚F
HTdi<230˚F
&
Tp<257˚F
After 20 sec.
HTdi>275˚F
HTdi>248˚F for 10 min. or more.
When occurring 3 times within 100 minutes,
the malfunction code "F3" is output.
INV. upper limit frequency: 1-step up
from current compressor frequency
SiUS34-907
Function

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