Control Specification SiBE041029EC
35 Function and Control
3.3 Controls at Mode Changing / Start-up
3.3.1 Preheating Control
Outline The inverter operation in open phase starts with the conditions of the outdoor temperature, the
discharge pipe temperature, the radiation fin temperature, and the preheating command from
the indoor unit.
Detail Outdoor temperature ≥ A°C → Control I
Outdoor temperature < A°C → Control II
Control I
ON condition
Discharge pipe temperature < B°C
Radiation fin temperature < 85°C
OFF condition
Discharge pipe temperature > C°C
Radiation fin temperature ≥ 90°C
Control II
ON condition
Discharge pipe temperature < D°C
Radiation fin temperature < 85°C
OFF condition
Discharge pipe temperature > E°C
Radiation fin temperature ≥ 90°C
3.3.2 Four Way Valve Switching
Outline The four way valve coil is energized / not energized depending on the operation. (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.
Detail OFF delay switch of four way valve
The four way valve coil is energized for 150 seconds after the operation is stopped.
A (°C) B (°C) C (°C) D (°C) E (°C)
RX50/60G2V1B
RX50/60G2V1B9
71 class
10 6 8 10.5 12
RX50/60G3V1B
RX60G4V1B
–2.5 0 2 10 12
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