Daikin VRV III REYQ8PY1, Service Manual

Page: 139 / 452

Protection Control Si37-701
128 Function
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]
★
The following control is performed for each compressor of single unit as well as multi units.
[INV compressor]
[STD compressor]
In control of discharge pipe temperature protection
INV Comp. upper
limit step:
1-step down INV Comp. upper
limit step:
1-step up
HTdi>115˚C
or
HTdi>115˚C
Tp>135˚C
or
HTdi<100˚C
Tp<110˚C
HTdi>130˚C
or
HTdi>135˚C
HTdi>120˚C continues for 10 minutes or more.
or
After 30 sec.
After 20 sec.
Frequency agreement
Tp>135˚C
HTdi<110˚C
Tp<125˚C
&
&
52Hz+OFF+OFF
HTdi>120˚C continues for 90 seconds
or more.
When occuring 3 times within 100 min.,
the malfunction code “F3” is output.
Normal operation
INV upper limit step=max (Max. step)
Discharge pipe
temperature
standby
or
After 10 min.
Discharge pipe temp.
protection control not limited
HTds>120˚C continues for 5 min. or more.
HTds>135˚C
Tp>135˚C continues for 10 min. or more.
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.