Control Specification
SiUS042113E
64
Part 4 Functions and Control
3.4 Controls at Mode Changing/Start-up
3.4.1 Preheating Control
Applicable
Models
RXM18/24VVJU
Outline
The inverter operation in open phase starts with the conditions of the preheating command from the
indoor unit, the outdoor temperature, the discharge pipe temperature, and the radiation fin
temperature.
Details
ON Condition
Outdoor temperature <
A
°C
Discharge pipe temperature < (outdoor tempe
B
)°C
OFF condition
Outdoor temperature >
C
°C
Discharge pipe temperature > (outdoor tempe
D
)°C
3.4.2 Four Way Valve Switching
Outline
The four way valve coil is energized/not energized depending on the operation mode.
(Heating: ON, Cooling/Dry/Defrost: OFF)
In order to eliminate the switching sound as the four way valve coil switches from ON to OFF when
the heating is stopped, the OFF delay switch of the four way valve is carried out.
Details
OFF delay switch of four way valve
The four way valve coil is energized for 160* seconds after the operation is stopped.
*10 seconds in heating operation when the outdoor temperature is lower than -9 °C (15.8°F)
3.4.3 Four Way Valve Operation Compensation
Outline
At the beginning of operation as the four way valve is switched, the pressure difference to activate
the four way valve is acquired when the output frequency is higher than a certain fixed frequency,
for a certain fixed time.
Details
Starting Conditions
When the compressor starts and the four way valve switches from OFF to ON
When the four way valve switches from ON to OFF during operation
When the compressor starts after resetting
When the compressor starts after the fault of four way valve switching
The lower limit of frequency keeps
A
Hz for
B
seconds for any of the conditions above.
A
B
C
D
(°C)
(°F)
(°C)
(°F)
(°C)
(°F)
(°C)
(°F)
18
64
10 ~ 18
50 ~ 64
22
72
12 ~ 20
54 ~ 68
09/12 class
18/24 class
Cooling Heating
Cooling
Heating
A
(Hz)
46
36
28
30
B
(seconds)
60
60
70
70
Содержание FTXM-V Series
Страница 13: ...SiUS042113E Part 1 General Information 9 1 Applicable Models 10 2 Functions 11 Part 1 General Information...
Страница 16: ...SiUS042113E 12 Part 2 Specifications 1 Specifications 13 Part 2 Specifications...
Страница 96: ...Troubleshooting SiUS042113E 92 Part 6 Service Diagnosis Reference Check No 01 Refer to P 134...
Страница 147: ...SiUS042113E Check Part 6 Service Diagnosis 143 09 12 class 18 24 class 1 2 3 4 Multimeter R24538 1 2 3 4 Multimeter...
Страница 150: ...Check SiUS042113E 146 Part 6 Service Diagnosis 18 24 class R24539 DC DC W V U...
Страница 165: ...SiUS042113E Piping Diagrams Part 8 Appendix 161 1 2 Outdoor Unit RXM09 12VVJU RXM18VVJU 3D131979 3D132216...
Страница 166: ...Piping Diagrams SiUS042113E 162 Part 8 Appendix RXM24VVJU 3D132217...
Страница 171: ...SiUS042113E Operation Limit Part 8 Appendix 167 3 Operation Limit RXM09 12 18 24VVJU 3D133582A...
