Outline of Control PACD011001C2
440 Function UM Combination “MA1R Series” Using R-407C
3.1.13 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]
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)]
[Oil return operation/defrosting operation]
„
SVTi (Y3S) is OFF at any case when inverter compressor stops.
Liquid Injection
Control (STD
Compressor)
[In cooling operation]
DSHs: STD compressor discharge pipe superheated degree
= Tds1, 2 (Th3-2) - (HP equivalent saturation temperature)
Tds1, 2 : STD compressor discharge pipe temperature (Th3-2)
[In heating operation]
Normal operation SVTi : ON
DSHi≥40˚C
DSHi<15˚C
(V0826)
OR
&
DSHi<25˚C
10min elapsed
Normal operation SVTi : ON
• Tdi≥100˚C
• LP<0.05MPa
• (HP+0.10) / (LP+0.10)>8
• Tdi<90˚C
• LP>0.07MPa
• 2 min elapsed
(V0827)
OR
&
Preparing oil return
and defrosting
SVTi : ON
DSHi≥15˚C
Start oil return
& Defrost operation
(V0828)
Normal operation
SVTs1 (Y4S), SVTs2 (Y6S) : ON
10 min
DSHs1, DSHs2≥40˚C
DSHs1, DSHs2<15˚C
(V0829)
Normal operation
SVTs1 (Y4S), SVTs2 (Y6S) : ON
2 min
• Tds1, Tds2≥100˚C
• LP<0.05MPa
• (HP+0.10) / (LP+0.10)>8
• Tds1, Tds2<90˚C
• LP<0.07MPa
(V0830)
OR
&
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