SiENBE05-722_A Control Specification
Function and Control 37
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 RK(X)S25/35E2V1B, RK(X)S25/35G2V1B
ON Condition
When the discharge pipe temperature is below 10ºC, the inverter operation in open phase
starts.
OFF Condition
When the discharge pipe temperature is higher than 12ºC, the inverter operation in open
phase stops.
RK(X)S25/35G2V1B9
Outdoor temperature ≥ 7°C → Control A
Outdoor temperature < 7°C → Control B
Control A
ON condition
Discharge pipe temperature < 10°C
OFF condition
Discharge pipe temperature > 12°C
Radiation fin temperature ≥ 90°C
Control B
ON condition
Discharge pipe temperature < 20°C
OFF condition
Discharge pipe temperature > 22°C
Radiation fin temperature ≥ 90°C
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