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1. Operation Modes and Functions
1.1 Abbreviation
Unit element abbreviations
Abbreviation Element
T1 Indoor room temperature
T2 Coil temperature of evaporator
T3 Coil temperature of condenser
T4 Outdoor ambient temperature
T5 Compressor discharge temperature
1.2 Safety Features
Compressor three-minute delay at restart
Compressor functions are delayed for up to one minute
upon the first startup of the unit, and are delayed for up
to three minutes upon subsequent unit restarts.
Inverter module protection
The inverter module has an automatic shutoff mechanism
based on the unit’s current, voltage, and temperature.
If automatic shutoff is initiated, the corresponding error
code is displayed on the indoor unit and the unit ceases
operation.
Open Circuit/Disconnection Sensor Protection
Automatic shutoff based on fan speed
If the indoor fan speed registers below 300RPM for 50
seconds or more, it shuts off and restarts in 30 seconds.
If this happens 3 times, the unit ceases operation and the
corresponding error code is displayed on the indoor unit.
Indoor fan delayed operation
• When the unit starts, the louver is automatically
activated and the indoor fan will operate after a
period of 7 seconds.
• If the unit is in heating mode, the indoor fan is
regulated by the anti-cold wind function.
1.3 Display Function
Unit display functions
Cassette 650x650 BOX-SL 2
Cassette 950x950 BOX-SL2
1.4 Fan
When fan mode is activated:
• The outdoor fan and compressor cease operation.
• Temperature control is disabled and no temperature
setting is displayed.
• The indoor fan speed can be set to high, medium, low,
or auto.
• The louver operations are identical to those in cooling
mode.
• Auto fan:
• When it fan-only mode, operates the same as auto
fan in cooling mode with the temperature set at
24℃.
1.5 Cooling Mode
1.5.1 Indoor Fan Control
• In cooling mode, the indoor fan operates continuously.
The fan speed can be set to high, medium, low or auto.
• The auto fan acts according to the value of T1-Td.
1.5.2 Outdoor Fan Control
• For 12k:The outdoor fan is controlled by T4 and
compressor frequency.
• For other models: The outdoor fan is controlled by T4.
1.5.3 Evaporator Temperature Protection
---T2<0℃, the compressor stops and restarts only when
T2≥5℃.
Product Features
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