SiUS341802E
Special Control
Functions and Control
60
7. Special Control
7.1
Pump Down Residual Operation
Pc : High pressure sensor detection value
Pe : Low pressure sensor detection value
Ta : Outdoor air temperature
Te : Low pressure equivalent saturation temperature
DSH : Discharge pipe superheated degree
If the liquid refrigerant stays in the evaporator at the startup of a compressor, this liquid refrigerant enters the compressor,
thus resulting in diluted oil in the compressor and then degraded lubrication performance.
Consequently, in order to recover the refrigerant in the evaporator while the compressor stops, the pump down residual
operation is conducted.
∗
RXYQ72TA
Part Name
Electric Symbol
Function of Functional Part
Normal Cooling
Normal Heating
Inverter compressor
M1C
24 rps/37 rps
∗
24 rps/37 rps
∗
Inverter fan
M1F, M2F
For heat exchanger mode
For heat exchanger mode
Electronic expansion valve (Heat
exchanger upper)
Y1E
Same as normal operation
Same as normal operation
Electronic expansion valve (Heat
exchanger lower)
Y3E
Electronic expansion valve
(Subcooling heat exchanger)
Y2E
0 pulse
0 pulse
Electric expansion valve (Subcooling
injection)
Y4E
760 pulse
760 pulse
Electronic expansion valve
(Refrigerant cooling)
Y5E
Same as normal operation
Same as normal operation
Electronic expansion valve (Receiver
gas purge)
Y7E
Open slightly
Open slightly
Solenoid valve (Oil separator oil
return)
Y1S
ON
ON
Solenoid valve (Hot gas bypass)
Y2S
OFF
OFF
Solenoid valve (Liquid shutoff)
Y3S
ON
ON
Four way valve (HP/LP gas pipe)
Y4S
Hold
Hold
Four way valve (Heat exchanger
lower)
Y5S
Hold
Hold
Four way valve (Heat exchanger
upper)
Y6S
Hold
Hold
Solenoid valve (Accumulator oil
return)
Y7S
ON
ON
Ending condition
A lapse of 5 minutes
Master unit HTdi > 118
°
C (244.4°F)
Pc_max > 2.94 MPa (426 psi)
A lapse of 3 minutes
Pe_min < 0.19 MPa (27.6 psi)
Ta_min – Te_max > 8
°
C (14°F)
HTdi_max > 118
°
C (244.4°F)
OR
OR
&
Содержание Aurora Series
Страница 316: ...Wiring Diagrams SiUS341802E 303 Appendix 1 Wiring Diagrams 1 1 Outdoor Unit RXLQ72TATJU 2D112580A ...
Страница 317: ...SiUS341802E Wiring Diagrams Appendix 304 RXLQ96 120TATJU 2D112581A ...
Страница 318: ...Wiring Diagrams SiUS341802E 305 Appendix RXLQ72TAYDU 2D112582A ...
Страница 319: ...SiUS341802E Wiring Diagrams Appendix 306 RXLQ96 120TAYDU 2D112583A ...
Страница 320: ...Wiring Diagrams SiUS341802E 307 Appendix RXLQ72 96 120TAYCU RXYQ72 96 120 144 168TAYCU 2D112579A ...
Страница 330: ...Wiring Diagrams SiUS341802E 317 Appendix 1 3 2 Energy Recovery Ventilator VAM Series VAM300 470 600GVJU 3D073269C ...
Страница 331: ...SiUS341802E Wiring Diagrams Appendix 318 VAM1200GVJU 3D073270C ...
Страница 332: ...Revision History Month Year Version Revised contents 04 2018 SiUS341802E First edition ...