SiBE28-804
General Functionality
Functional Description
47
1.12 Defrost Operation
Outline
When the unit is operating in heating mode, a defrost operation will be conducted in order to
avoid ice formation on the outdoor unit heat exchanger.
Defrost starting
conditions
Defrost will start when the following conditions have been realized:
RZQ71~140C7, RZQS71~140C7V1B
Areas
Defrost upper limit A
&
• Integrated compressor running time is 25 minutes or more since the completion of the
previous defrost operation.
OR
• Defrost upper limit time A is met.
• Outdoor unit heat exchanger area temperature (Tb) is within the defrost requesting
area.
-20
-15
-10
5
0
-3
-5
-6
-10
-7
-15
-20
-23
-17
-10
-7
-4
-7
-5
-5
-8
-13
-16
-19
-21
-12
-9
-6
-24
-27
-28
-14
-11
-8
-8
-2
-25
-30
15
5
2
-1
-4
-1
-11
10
Outdoor unit heat exchanger temperature Tb (˚C)
Defrost permit
area
Defrost request
area
When slightly quick defrost starting is set (Permit)
Outdoor temperature Ta(˚C)
Factory setting (Permit)
When slightly quick defrost starting is set (Request)
When slightly slow defrost starting is set (Permit)
Factory setting (Request)
When slightly slow defrost starting is set (Request)
When quick
defrost starting is
set 16(26)-3-03
Factory setting
16(26)-3-01
When slow defrost
starting is set
16(26)-3-02
Outdoor temperature > -5°C
40 minutes
2 hours
6 hours
Outdoor temperature
≤
-5°C
40 minutes
6 hours
8 hours
Summary of Contents for FHQ100BUV1B x 2
Page 13: ...SiBE28 804 2 ...
Page 19: ...Model Name and Power Supply SiBE28 804 8 General Information ...
Page 29: ...Specifications SiBE28 804 18 Specifications ...
Page 33: ...Wired Remote Controller SiBE28 804 22 Remote Controller 1 2 Installation ...
Page 34: ...SiBE28 804 Wired Remote Controller Remote Controller 23 ...
Page 93: ...Outdoor Unit Fan Speed Control SiBE28 804 82 Functional Description ...
Page 131: ...Test Run and Operation Data SiBE28 804 120 Test Operation ...
Page 251: ...Troubleshooting by Remote Controller Display LED Display SiBE28 804 240 Troubleshooting ...
Page 277: ...PCB Layout SiBE28 804 266 Appendix ...
Page 297: ...RZQ100 140C7 RZQS125 140C7V1B SiBE28 804 286 Removal Procedure ...
Page 311: ...SiBE28 804 iv Index ...