Control Specification SiUS041111
36 Function and Control
3.3 Controls at Mode Changing / Start-up
3.3.1 Preheating Operation
Outline The inverter operation in open phase starts with the conditions of the preheating command from the
indoor unit, the outdoor temperature, and the discharge pipe temperature.
Detail 09/12 class
Outdoor temperature 7°C (44.6°F) Control A (preheating for normal state)
Outdoor temperature < 7°C (44.6°F) Control B (preheating of increased capacity)
Control A
ON condition
Discharge pipe temperature < 10°C (50°F)
OFF condition
Discharge pipe temperature > 12°C (53.6°F)
Radiation fin temperature 90°C (194°F)
Control B
ON condition
Discharge pipe temperature < 20°C (68°F)
OFF condition
Discharge pipe temperature > 22°C (71.6°F)
Radiation fin temperature 90°C (194°F)
15/18/24 class
ON Condition
When the discharge pipe temperature is below 10°C (50°F), the inverter operation in open
phase starts.
OFF Condition
When the discharge pipe temperature is higher than 12°C (54°F), the inverter operation in open
phase stops.
3.3.2 Four-Way Valve Switching
Outline In heating operation, current is conducted, and in cooling and defrosting, current is not conducted.
In order to eliminate the switching sound when the heating is stopped, as the four-way valve coil
switches from ON to OFF, the OFF delay switch of the four-way valve is carried out after the
operation stopped.
Detail OFF delay switch of four-way valve:
The four-way valve coil is energized for 160 seconds after the operation is stopped.
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