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Special Control
SiUS331708EA
45
Functions and Control
3. Special Control
3.1
Startup Control
This control is used to equalize the pressure in the suction and discharge sides of the compressor prior to
compressor startup, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor.
In addition, to avoid stresses to the compressor due to oil return, etc., after startup, the following control is made
and the position of the four way valve is also determined.
Pc : High pressure sensor detection value
Pe : Low pressure sensor detection value
Ta : Outdoor air temperature
Tc : High pressure equivalent saturation temperature
3.1.1 Startup Control in Cooling Operation
Thermostat ON
Outdoor unit
actuator
Electric symbol
Pressure equalization control
prior to startup
Startup control
24/36 class 48 class 60 class
STEP 1
STEP 2
Compressor
M1C
M1C
M1C
0 Hz
Minimum frequency
Increases 2 steps every 20 seconds
from minimum frequency
until Pc – Pe > 0.39 MPa
(56.6 psi) is achieved
Outdoor fan
M1F
M1F
M1F,
M2F
OFF
Ta < 20
°
C (68
°
F):
OFF
Ta
≥
20
°
C (68
°
F):
STEP 4
+1 step/15 sec. (when Pc >
2.16 MPa (313 psi))
–1 step/15 sec. (when Pc <
1.77 MPa (257 psi))
Four way valve
Y1S
Y1S
Y1S
Holds
OFF
OFF
Main electronic
expansion valve
Y1E
Y1E
Y1E
0 pulse
480 pulse (Fully
open)
480 pulse (Fully open)
Subcooling
electronic
expansion valve
Y3E
0 pulse
0 pulse
0 pulse
Hot gas bypass
valve
Y2S
ON
OFF
OFF
Injection valve
Y3S
Y3S
OFF
OFF
OFF
Ending conditions
•
Pc – Pe < 0.3 MPa
(43.5 psi)
•
A lapse of 5 min.
A lapse of 10 sec.
•
A lapse of 360 sec.
•
Pc – Pe > 0.39 MPa
(56.6 psi)
•
Tc > 48°C (118°F)
•
Pe < 0.55 MPa (80 psi)
OR
OR
Summary of Contents for RXSQ24TAVJU
Page 1: ...Service Manual SiUS331708EA RXSQ24 36 48 60TAVJU Heat Pump 60 Hz...
Page 290: ...Wiring Diagrams SiUS331708EA 277 Appendix RXSQ48TAVJU 3D109546A...
Page 291: ...SiUS331708EA Wiring Diagrams Appendix 278 RXSQ60TAVJU 3D109547A...
Page 295: ...SiUS331708EA Wiring Diagrams Appendix 282 FXZQ05 07 09 12 15 18TAVJU 3D110443A...
Page 298: ...Wiring Diagrams SiUS331708EA 285 Appendix FXEQ07 09 12 15 18 24PVJU 3D098557A...
Page 300: ...Wiring Diagrams SiUS331708EA 287 Appendix FXSQ05 07 09 12 15 18 24 30 36 48 54TAVJU 3D110467B...
Page 301: ...SiUS331708EA Wiring Diagrams Appendix 288 FXMQ07 09 12 15 18 24 30 36 48 54PBVJU 3D093209B...
Page 302: ...Wiring Diagrams SiUS331708EA 289 Appendix FXHQ12 24 36MVJU 3D048116C...
Page 303: ...SiUS331708EA Wiring Diagrams Appendix 290 FXAQ07 09 12 18 24PVJU 3D075354C...
Page 309: ...SiUS331708EA Wiring Diagrams Appendix 296 VAM1200GVJU 3D073270D...