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Control for Heat Pump Models
Si01-406
46
Functions and Control
3.9
Liquid Compression Protection Function 2
Outline
In order to obtain the dependability of the compressor, the compressor must be stopped
according to the conditions of the temperature of the outdoor air and outdoor heat exchanger.
Detail
Operation stop depending on the outdoor air temperature
Compressor operation turns OFF under the conditions that the system is in cooling operation
and outdoor air temperature is below 0°C.
3.10
Defrost Control
Outline
Heat Pump Only
Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor
heat exchanger temperature must be more than its fixed value when finishing.
Detail
Conditions for Starting Defrost
The starting conditions must be made with the outdoor air temperature and heat exchanger
temperature. Under the conditions that the system is in heating operation, 6 minutes after the
compressor is started and more than 32 minutes of accumulated time pass since the start of the
operation or ending the defrosting.
Conditions for Canceling Defrost
The judgment must be made with heat exchanger temperature. (4°C~24°C)
Frequency
Compressor
Four way valve
Fan
Electronic expansion
valve opening
ON
OFF
ON
OFF
ON
OFF
0Hz
3sec.
30pps
55pps
55pps
Initial opening
PI control
40pps
3sec.
75sec.
45sec.
450sec.
180sec.
(R4121)
Summary of Contents for FT25CV1A
Page 7: ...Si01 406 vi Table of Contents...
Page 15: ...Functions Si01 406 4 List of Function...
Page 21: ...Specifications Si01 406 10 Specifications...
Page 205: ...Wiring Diagrams Si01 406 194 Appendix...
Page 209: ...Si01 406 iv Index...