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ESIE05-03
Outdoor Unit Functional Concept
Part 2 – Functional Description
2–59
3
2
4
5
1
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 100~140 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
RZQ100~140:
65 pls
15 s
ESIE05-03.book Page 59 Wednesday, April 6, 2005 4:09 PM
Summary of Contents for RZQ100B7W1B
Page 1: ...Service Manual ESIE05 03 RZQ71 125B8V3B RZQ100 140B7W1B Sky Air Inverter R 410A B series...
Page 2: ......
Page 10: ...ESIE05 03 viii Table of Contents 3 1 4 5...
Page 24: ...ESIE05 03 1 2 Part 1 System Outline 3 1 1 5...
Page 32: ...General Outline Outdoor Units ESIE05 03 1 10 Part 1 System Outline 3 1 1 4 5...
Page 42: ...Specifications ESIE05 03 1 20 Part 1 System Outline 3 1 1 4 5...
Page 56: ...Functional Diagrams ESIE05 03 1 34 Part 1 System Outline 3 1 1 4 5...
Page 58: ...ESIE05 03 1 36 Part 1 System Outline...
Page 70: ...Wiring Diagrams ESIE05 03 1 48 Part 1 System Outline 3 1 1 4 5...
Page 84: ...PCB Layout ESIE05 03 1 62 Part 1 System Outline 3 1 1 4 5...
Page 86: ...ESIE05 03 2 2 Part 2 Functional Description 3 1 2 5...
Page 110: ...General Functionality ESIE05 03 2 26 Part 2 Functional Description 3 1 2 4 5...
Page 150: ...ESIE05 03 3 2 Part 3 Troubleshooting 3 1 3 5...
Page 188: ...Troubleshooting ESIE05 03 3 40 Part 3 Troubleshooting 3 1 3 4 5...
Page 264: ...Additional Checks for Troubleshooting ESIE05 03 3 116 Part 3 Troubleshooting 3 1 3 4 5...
Page 266: ...ESIE05 03 4 2 Part 4 Commissioning and Test Run 3 1 4 5...
Page 306: ...ESIE05 03 5 2 Part 5 Disassembly and Maintenance 3 1 5...