Discharge Pipe Protection Control - Daikin CMSQ200A7W1B Service Manual

SiBE28-805
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>115˚C
or
Tp>135˚C
INV upper limit frequency:
1-step down from current
compressor rps
HTdi>115˚C
or
Tp>135˚C
HTdi>130˚C
HTdi>120˚C
or
for 90 sec.
or more.
Tp>130˚C
CMSQ200A7: 52 Hz
CMSQ250A7: 62 Hz
Function
Each compressor performs the discharge pipe temperature protection control individually
in the following sequence.
Normal operation
&
After 30 sec.
In discharge pipe temp.
protection control
or
Discharge pipe
temperature standby (for
a period of 10 minutes)
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<100˚C
superheated degree.
Tp<110˚C
HTdi<110˚C
&
Tp<125˚C
After 20 sec.
HTdi>135˚C
HTdi>120˚C for 10 min. or more.
When occurring 3 times within 100 minutes,
the malfunction code "F3" is output.
Protection Control
INV upper limit frequency: 1-step up
from current compressor frequency
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