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Technical Information
6. FUNCTION AND CONTROL
FUNCTION CONTROL
1. Cooling mode
• If the compressor is stopped and the indoor unit reaches the cooling operation condition; the electronic expansion
valve, the outdoor fan and the compressor will all begin to operate.
• If the compressor stops suddenly, the outdoor fan will stop within 1 minute.
• When the unit converts to heating mode, the 4-way valve will be energized after the compressor has been at a
full stop for 2 minutes.
• The outdoor fan starts 5 seconds before the compressor turns on. When powering up the unit, the outdoor fan
will run 3 minutes on high speed and then it will run at set speed. The fan runs for a minimum period of 80
seconds for each setting adjusted by the user.
• When the compressor stops, the outdoor fan will run at present speed for 1 additional minute before stopping.
• Should the outdoor unit malfunction or should it go into Protection Mode, the indoor unit will maintain
operational status.
1.2. Dry mode (dehumidification mode)
• The dry mode process is the same as those in cooling mode.
• The 4-way valve shall be closed.
• Temperature setting range is 60.80F - 86.00F.
• Protection function will be the same as in cooling mode.
• If the compressor is stopped and the indoor unit reaches the cooling operation condition; the electronic expansion
valve, the outdoor fan and the compressor will all begin to operate.
If the compressor stops
1.3. Heating mode
• Temperature setting range is 60.80F - 86.00F.
• When the compressor stops, the outdoor fan will run at present speed for 1 additional minute before stopping.
• While in Heating Mode, the indoor unit will enter into cold air prevention status. When the unit stops (or is turned
off), the indoor unit enters into residual heat blowing status.
• The outdoor fan starts 5 seconds before the compressor turns on. When powering up the unit, the outdoor fan
will run 3 minutes on high speed and then it will run at set speed. The fan runs for a minimum period of 80
seconds for each setting adjusted by the user.
1.4 Fan mode
• Temperature setting range is 60.80F - 86.00F.
• The fan will operate at its user set speed on the indoor unit.
• Indoor fan can operate at HIGH, MEDIUM, LOW, or AUTO fan speed.
Protection Function
2.1 Mode Conflict Protection of Indoor Unit
• When the indoor unit is in basic mode, compare the mode of other indoor units to see if there is a conflict – such
as cooling mode in conflict with dry or heating mode(s).
• No matter which indoor unit operates first, the unit will run in heating mode.
2.2 Mode Conflict Protection of Indoor Unit
• When the tube temperature is low, the compressor raises the operational frequency. When the tube temperature
is high, the compressor frequency is restricted or lowers the operational frequency; when the tube temperature is
too high, the compressor protection stops running.
• If the discharge temperature protection continuously runs for 6 cycles, the compressor will shut down and fail
to run. The compressor will be able to run after cutting off power to the unit and restoring it after the capacitors
have been effectively rid of any residual charge. If the running time of the compressor is longer than 7 minutes,
the protection time record will be cleared.