Si18-201 Main Functions
Main Functions 99
Draft Avoidance
Control 2
When hot start is cancelled or when cold air prevention control is finished, if the fan speed is set
to “H,” the fan turns at L speed for a certain amount of time, thus avoiding draft while the flap is
moving.
Air Flow Volume
Shift Control
The air flow volume of an indoor unit is varied to prevent shutdown due to a rise in the high
pressure level.
(Air volume up at heating operation)
1. When indoor unit suction air temperature is 25°C or higher
ON condition Tc
≥
60°C
Reset condition Tc<50°C
Note that the air flow volume is varied for a preset time when the thermostat is ON.
2. When indoor unit suction air temperature is lower than 25°C
ON conditionTc
≥
60°C
Reset conditionTc<59°C
Freeze
Prevention
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 prevention control from activating
during cooling operation under low outside air temperature. (For details, see the section on
cooling operation under low outside air temperature.)
Auto-Restart
Function
If there is a power cut when the unit is operating, it will automatically resume the same operating
mode when the power is restored.
Caution When performing maintenance and the power supply is to be shut off, be sure to turn the remote
controller’s ON/OFF switch OFF first.
Shutting the power supply switch off while the ON/OFF switch is still ON is dangerous because the
“power failure automatic reset function” will cause the indoor fan to start turning immediately, or the
outdoor unit fan to automatically start turning three minutes after the power supply is turned back on.
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