Klimaire KSIN Series Service Manual - Manual (Page 36)

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If T4＞5℃ or the compressor starts running, the preheating function will stop.
8.3.8 Zero crossing detection error protection
If AC detects time interval is not correct for continuous 240s, the unit will stop and the LED will display
the failure. The correct zero crossing signal time interval should be between 6-13ms.
8.4 Operation Modes and Functions
8.4.1 Fan mode
(1) Outdoor fan and compressor stop.
(2) Temperature setting function is disabled, and no setting temperature is displayed.
(3) Indoor fan can be set to high/med/low/auto.
(4) The louver operates same as in cooling mode.
(5) Auto fan:
27.5
27
High
Low
25
Medium
25.5