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ESIE05-03
Outdoor Unit Functional Concept
Part 2 – Functional Description
2–55
3
2
4
5
1
3.3.10 Pressure Difference Control
Outline
To ensure the compression ratio (pressure difference between high and low pressure) at low outdoor
temperature conditions in cooling mode and high outdoor temperature conditions in heating mode, the
outdoor fan and target compressor frequency may be varied.
Cooling
In cooling low ambient conditions, the outdoor fan speed and compressor frequency will be adapted
to secure the differential pressure between high and low pressure.
Fan control in
cooling
Parameters
∆
P > 15bar
Compression ratio > 3.2
Normal control
Upper limit (step 8)
Upper limit (step 8)
Upper limit (step 7)
Upper limit (step 6)
Upper limit (step 5)
Upper limit (step4)
Upper limit (step 3)
Upper limit (step 2)
Upper limit (step 1)
Upper limit (step 0)
= Outdoor fan OFF
Condition B
Condition B
Condition B
Condition B
Condition B
Condition B
Condition B
Condition B
Outdoor fan upper limit : step 8
∆
P > 11bar
Compression ratio > 2.4
Condition B
90 seconds have passed
HP > 20bar (RZQ71)
HP > 17bar (RZQ100~140)
∆
P > 10bar
Compression
ratio >2.2
&
&
&
&
HP > 35 bar (RZQ100~140)
HP > 30 bar (RZQ71)
TA > 27°C
OR
OR
&
&
OR
OR
&
OR
T
Fin
< (T - 15) °C
90 seconds have passed
HP < 16 bar
∆
P < 8bar
Compression ratio < 1.8
90 seconds have passed
HP < 16 bar
∆
P < 8bar
Compression ratio < 1.8
Condition A
∆
P < 9.5bar
Compression ratio < 2.1
HP < 19 bar
TA < 25°C
&
OR
HP > 18 bar
Tfin > T °C
∆
P > 9bar
Compression
ratio > 2.0
Condition A
Condition A
Condition A
Condition A
Condition A
Condition A
Condition A
Condition A
RZQ71B8V3B
RZQ100~125B8V3B
RZQ100~140B7W1B
T°C
79°C
71°C
68°C
ESIE05-03.book Page 55 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...