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8.2.6 Temperature Sensor short/open protection
When the outdoor condenser pipe temperature T3, outdoor ambient temperature T4, indoor evaporator outlet
temperature
T
2B
are checked out of range 0.05～4.95V, it think temperature sensor short/open
protection. The compressor, four-way valve and outdoor fan motor will stop and send malfunction
signal to indoor units.
When the volt is resumed to the range 0.05～4.95V, then resume signal to indoor units and control
on-off of the compressor, four-way valve and outdoor fan motor by indoor size.
8.2.7 Outdoor low temperature protection
If the outdoor temperature is lower than -15℃ for 1hour, the compressor and fan motor will stop. And
any operation is not valid.
If the outdoor temperature is higher than -12℃ for 10 minutes and the compressor stops operation
for 1h, or the outdoor temperature is higher than 5℃ for 10 minutes, then restart and enter into the
prior operation mode.
If any indoor unit sends out this protection request, the outdoor unit will stop compressor until all
indoor units have not this protection request.
8.2.8 Compressor pre-heating function
When the outdoor temperature is lower than 3℃ and the compressor stops operation for more than 3
hours, or the outdoor temperature is lower than 3℃ and the power is just put on, the compressor
enters into pre-heating condition.
8.3 Display function
8.3.1 Checking function
The indoor and outdoor operation condition can be examined by check button.
Normal display Operation mode Capacity request Number of indoor units ambient temp.
Outdoor pipe temp. Compressor current No.1 PMV opening No.2 PMV opening
No.3 PMV opening
8.3.2 Explanation of display function
1. “－－”: Standing-by
2. When the compressor is in operation, the compressor operation frequency will be displayed on
the digital pipe.
3. “ｄＦ”: Defrosting
4. Under standing-by, display“－－” when pre-heating and display “11.” When pre-heating after
turning on the AC.
5. Under malfunction protection:
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