Outdoor Unit Functional Concept
ESIE04-01
2–56
Part 2 – Functional Description
3
1
2
4
5
3.4.1
Expansion Valve Control at Startup
Outline
Before going to the general expansion valve control, the expansion valve opening will be limited in
order to avoid the risk of liquid back and allow quick build up of pressure difference.
Details
During startup, the opening degree is determined by both the compressor frequency & the suction
superheat. During startup, it is not possible to use only the value of the suction superheat because the
operation is not stable yet. As a consequence also the SH value will not be stable.
Graph
Expansion valve
opening during
pressure
equalization
On RZQ71 units (using double swing compressor) the expansion valve will be fully opened (to 480
pulses) for pressure equalisation before compressor start-up. Just before compressor start up, the
expansion valve opening will be set to 65 pulses, same as for the 100 & 125 class.
Ending condition
The starting control will be terminated when the low pressure value < 6 bar or when the maximum
starting time of 10 minutes has been reached in case the low pressure value stays > 6 bar.
Compressor
Motorized valve
Pressure equalizing
control before
compressor start
Pressure
equalizing
start
Pressure
equalizing
complete
Starting
control
complete
Starting control
RZQ71: 73 Hz
RZQ100 & 125: 107 Hz
RZQ71: 480 pls
RZQ100/125:
65 pls
15 s
RZQ - Final.book Page 56 Wednesday, September 8, 2004 8:40 AM
Summary of Contents for RZQ71~125B7V3B
Page 1: ...Service Manual ESIE04 01 RZQ71 125B7V3B Sky Air Inverter R 410A B series ...
Page 2: ......
Page 24: ...ESIE04 01 1 2 Part 1 System Outline 3 1 1 5 ...
Page 32: ...General Outline Outdoor Units ESIE04 01 1 10 Part 1 System Outline 3 1 1 4 5 ...
Page 64: ...General Outline Indoor Units ESIE04 01 1 42 Part 1 System Outline 3 1 1 4 5 ...
Page 76: ...Specifications ESIE04 01 1 54 Part 1 System Outline 3 1 1 4 5 ...
Page 92: ...Functional Diagrams ESIE04 01 1 70 Part 1 System Outline 3 1 1 4 5 ...
Page 94: ...ESIE04 01 1 72 Part 1 System Outline ...
Page 122: ...Wiring Diagrams ESIE04 01 1 100 Part 1 System Outline 3 1 1 4 5 ...
Page 140: ...ESIE04 01 2 2 Part 2 Functional Description 3 1 2 5 ...
Page 162: ...General Functionality ESIE04 01 2 24 Part 2 Functional Description 3 1 2 4 5 ...
Page 200: ...Outdoor Unit Functional Concept ESIE04 01 2 62 Part 2 Functional Description 3 1 2 4 5 ...
Page 202: ...ESIE04 01 3 2 Part 3 Troubleshooting 3 1 3 5 ...
Page 288: ...Error Codes Outdoor Units ESIE04 01 3 88 Part 3 Troubleshooting 3 1 3 4 5 ...
Page 312: ...Additional Checks for Troubleshooting ESIE04 01 3 112 Part 3 Troubleshooting 3 1 3 4 5 ...
Page 314: ...ESIE04 01 4 2 Part 4 Commissioning and Test Run 3 1 4 5 ...
Page 356: ...ESIE04 01 5 2 Part 5 Disassembly and Maintenance 3 1 5 ...
Page 484: ...ESIE04 01 viii Index 3 1 4 5 ...