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Indoor Unit
Si21-205
76
Function and Control
1.3
Function Details
Thermostat
Control
Freeze-up
Protection
Control
The thermostat turns OFF under the following temperature conditions to prevent freezing of the
indoor unit heat exchanger.
The motorized valve is controlled to maintain the indoor unit heat exchanger temperature
(Te) above 0˚C.
The outdoor unit fan speed is reduced to prevent freeze-up protection control from activating
during cooling operation under low outside air temperature. (For details, see the section on
cooling operation under low outside air temperature.)
Initial setting
Display
Display
Display
Setting
Setting
Cooling
Heating
Cool/Heat Automatic
Set temperature
Heating
thermostat OFF
Heating
thermostat ON
Cooling
thermostat ON
Cooling
thermostat OFF
Freeze prevention control
Outdoor unit heat exchanger temperature
(Te)
Reset after 10 continuous minutes
Thermostat OFF after
40 cumulative minutes
Thermostat OFF after 1 continuous minutes
from 8 min. after starting (FHQ only)
Thermostat OFF after
1 continuous minutes from 8 min. after starting (FFQ only)
Summary of Contents for Sky Air B-Series R-410A
Page 7: ...Si21 205 vi Table of Contents ...
Page 15: ...Models Si21 205 4 Model Name and Power Supply ...
Page 16: ...Si21 205 Functions 5 Part 2 Functions 1 List of Functions 6 ...
Page 35: ...Wireless Remote Controller Si21 205 24 Remote Controller ...
Page 79: ...Settings Concerning Maintenance Si21 205 68 Field Setting Detail of PCB 2 ...
Page 83: ...Maintenance Mode Setting Si21 205 72 Field Setting ...
Page 239: ...Troubleshooting for Outdoor Unit 50 60 class Si21 205 228 Troubleshooting ...
Page 321: ...Outdoor Unit 50 60 class Si21 205 310 Removal Procedure ...