Si33-105 Outline of Control (Outdoor Unit) < Symbols using in this manual >
Function R407C PLUS Series Heat Recovery System 77
3.5.3 Discharge Pipe Temperature Control
Controls the liquid injection and operating frequency to prevent abnormal increase of discharge
pipe temperature and compressor internal temperature.
Liquid Injection Control
Inverter compressor
!
Opens SVTi (Y3S) (solenoid valve for inverter compressor liquid injection) for 3
minutes after software startup.
[Cooling and Simultaneous cooling / heating operation]
DSHi: Inverter compressor discharge pipe superheated degree
= Tdi (Th3-1) - (HP equivalent saturation temperature)
Tdi: Inverter compressor discharge pipe temperature (Th3-1)
[Heating]
[Preparing Oil return and defrosting operation (1 min before operation start)]
!
SVTi is ON during oil return and defrost operation.
[Oil return operation/defrosting operation]
!
SVTi (Y3S) is OFF at any case when inverter compressor stops.
Normal operation SVTi : ON
DSHi≥40˚C
Lp<0MPa
DSHi<15˚C
DSHi>15˚C
(V0826)
OR
OR
&
&
DSHi<25˚C
Lp>0MPa
10min elapsed
Normal operation SVTi : ON
• Tdi≥100˚C
• LP<0.05MPa
• (HP+0.10) / (LP+0.10) >8
• DSHi>35˚C
• DSHi<20˚C
• Tdi<90˚C
• LP>0.07MPa
• 2 min elapsed
(V0827)
OR
OR
&
&
Preparing oil return
and defrosting
SVTi : ON
DSHi≥15˚C
Start oil return
& Defrost operation
(V0828)
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