Discharge Pipe Protection Control - Daikin VRV III REYQ8PY1B Service Manual

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.
[Contents]
★
[INV compressor]
HTdi>115˚C
or
Tp>135˚C
INV Comp. upper
limit step:
1-step down
After 30 sec.
[STD compressor]
Discharge pipe temp.
protection control not limited
134
The following control is performed for each compressor of single unit as well as multi units.
Normal operation
After 20 sec.
HTdi>115˚C
or
Tp>135˚C
In control of discharge pipe temperature protection
Frequency agreement
52Hz+OFF+OFF
Discharge pipe
temperature
standby
HTds>120˚C continues for 5 min. or more.
or
HTds>135˚C
Tp>135˚C continues for 10 min. or more.
After 10 min.
HTdi<100˚C
&
Tp<110˚C
INV upper limit step=max (Max. step)
INV Comp. upper
limit step:
1-step up
HTdi<110˚C
&
Tp<125˚C
HTdi>130˚C
or
HTdi>120˚C continues for 90 seconds
or more.
HTdi>135˚C
or
HTdi>120˚C continues for 10 minutes or more.
When occuring 3 times within 100 min.,
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.
SiBE37-701
Function