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SiUS331708EA
Outline of Control (Indoor Unit)
Functions and Control
76
6.10 Freeze-Up Prevention
Freeze-Up Prevention by Off Cycle (Indoor Unit Individual Control)
When the temperature detected by the liquid pipe temperature thermistor of the indoor heat exchanger drops too
low, the unit enters freeze-up prevention control in accordance with the following conditions, and is also set in
accordance with the conditions given below. (Thermostat OFF)
When freeze-up prevention is activated, the electronic expansion valve is closed, the drain pump turns on and
the airflow rate is fixed to L tap. When the following conditions for cancelling are satisfied, it will reset.
Conditions for starting:
Liquid pipe temperature
≤
– 1°C (30.2°F) (for total of 40 minutes)
or
Liquid pipe temperature
≤
– 5°C (23°F) (for total of 10 minutes)
Condition for cancelling:
Liquid pipe temperature
≥
+7°C (44.6°F) (for 10 minutes continuously)
The idea of freeze-up prevention control
Difficult to carry out freeze-up prevention operation
· For comfort, suppression of frequent thermostat ON/OFF is necessary.
· Suppressing the switching frequency of the compressor is required to ensure reliability.
After freeze-up prevention operation is carried out, the compressor can be defrosted properly.
· Water leakage prevention must be effective.
Normal operation
Start
Cancel
Liquid pipe
temperature
Start
Cancel
Normal operation
–
5
ºC
(23˚F)
0
ºC
(32˚F)
+
7
ºC
(44.6˚F)
–
1
ºC
(30.2˚F)
t1
t2
t3
t4
0
ºC
(32˚F)
+
7
ºC
(44.6˚F)
10 min.
OR
10 min.
10 min.
t
>
40
minutes
Freeze-up prevention control
Forced OFF by thermostat
Freeze-up prevention control
Forced OFF by thermostat
Summary of Contents for RXSQ24TAVJU
Page 1: ...Service Manual SiUS331708EA RXSQ24 36 48 60TAVJU Heat Pump 60 Hz...
Page 290: ...Wiring Diagrams SiUS331708EA 277 Appendix RXSQ48TAVJU 3D109546A...
Page 291: ...SiUS331708EA Wiring Diagrams Appendix 278 RXSQ60TAVJU 3D109547A...
Page 295: ...SiUS331708EA Wiring Diagrams Appendix 282 FXZQ05 07 09 12 15 18TAVJU 3D110443A...
Page 298: ...Wiring Diagrams SiUS331708EA 285 Appendix FXEQ07 09 12 15 18 24PVJU 3D098557A...
Page 300: ...Wiring Diagrams SiUS331708EA 287 Appendix FXSQ05 07 09 12 15 18 24 30 36 48 54TAVJU 3D110467B...
Page 301: ...SiUS331708EA Wiring Diagrams Appendix 288 FXMQ07 09 12 15 18 24 30 36 48 54PBVJU 3D093209B...
Page 302: ...Wiring Diagrams SiUS331708EA 289 Appendix FXHQ12 24 36MVJU 3D048116C...
Page 303: ...SiUS331708EA Wiring Diagrams Appendix 290 FXAQ07 09 12 18 24PVJU 3D075354C...
Page 309: ...SiUS331708EA Wiring Diagrams Appendix 296 VAM1200GVJU 3D073270D...