Special Control
SiUS39-602
58
Function
3.7.2 Stopping Operation of Slave Units During Master Unit is in Operation
With Multi-Outdoor-Unit System
In cooling operation: The system operates in Mode A or Mode B listed in the table below.
In heating operation: The system operates in Mode A or Mode B listed in the table below.
The changeover operation for mode A and B is performed for the reason that the required refrigerant amount varies
depending on the indoor unit operation capacity.
Actuator
Mode-A operation
Mode-B operation
Compressor
OFF
OFF
Outdoor unit fan
STEP4
OFF
Four way valve
OFF
Holds
Main motorized valve (EV1)
150 pls to 300 pls
0 pls
Subcooling motorized valve (EV2)
0 pls
0 pls
Hot gas bypass valve (SVP)
ON
ON
Oil equalization valve (SVO)
OFF
OFF
Receiver gas discharging valve
(SVG)
OFF
OFF
Non-operating unit liquid pipe stop
valve (SVSL)
OFF
ON
Mode transition conditions
To Mode B when Tc-Tl >0.27×(Tc - Ta) +6
To Mode A when gas shortage signal
is sent from indoor unit
Ending conditions
Slave units are required to operate.
Actuator
Mode-A operation
Mode-B operation
Compressor
OFF
OFF
Outdoor unit fan
STEP2
STEP2
Four way valve
ON
ON
Main motorized valve (EV1)
0 pls
0 pls
Subcooling motorized valve (EV2)
0 pls
0 pls
Hot gas bypass valve (SVP)
OFF
OFF
Oil equalization valve (SVO)
OFF
OFF
Receiver gas discharging valve
(SVG)
OFF
OFF
Non-operating unit liquid pipe stop
valve (SVSL)
OFF
ON
Mode transition conditions
To Mode B when Tc-mean temperature of
indoor unit liquid pipes>10
°
C
To Mode A when motorized valve of
operating outdoor unit fully opens.
Ending conditions
Slave units are required to operate.
Mode A : Operating unit collects refrigerant.
Mode B : Stopping unit storage refrigerant.
Operating
unit
Stopping
unit
∗
Mode A or B operation
Summary of Contents for REYQ72
Page 35: ...Specifications SiUS39 602 24 Specifications...
Page 121: ...Field Setting SiUS39 602 110 Test Operation...
Page 129: ...Troubleshooting by Remote Controller SiUS39 602 118 Troubleshooting...
Page 225: ...Troubleshooting OP Unified ON OFF Controller SiUS39 602 214 Troubleshooting...
Page 232: ...SiUS39 602 Piping Diagrams Appendix 221 1 3 BS Unit BSVQ36MVJU BSVQ60MVJU 4D045338...
Page 235: ...Wiring Diagrams for Reference SiUS39 602 224 Appendix REYQ144 168 192MTJU C 3D050354A...
Page 240: ...SiUS39 602 Wiring Diagrams for Reference Appendix 229 2 4 BS Unit BSVQ36M 60MVJU 3D045069A...
Page 249: ...Example of Connection R 410A Type SiUS39 602 238 Appendix...
Page 255: ...Method of Replacing The Inverter s Power Transistors and Diode Modules SiUS39 602 244 Appendix...
Page 265: ...Precautions for New Refrigerant R 410A SiUS39 602 254 Precautions for New Refrigerant R 410A...
Page 269: ...SiUS39 602 iv Index...