11-9
CONTROL SYSTEM
SM HDDHED 2-A.1 GB
11.11.8
IPM module protection
When the compressor starts, if there is over current or control voltage low for IPM module as some
abnormal results, IPM will detect module protection signal as the unit is on. Once the module protective
signal is detected, stop the unit with module protection immediately. If the module protection is
resumed and compressor has stopped for 3min, the unit will be allowed to operate.
If the module protection continuously occurs for 3 times, it should not be resumed automatically, and
you should press the ON/OFF button to resume.
11.11.9
Module overheating protection
If the module temperature is higher than 100C, the unit will stop. If module temperature is lower than
100C, and compressor has stopped for 3min, the unit will resume operating.
If the unit stops as module overheating protection for 6 times, it can not resume running automatically
and display malfunction, it can resume by pressing ON/OFF.
11.11.10 Compressor overload protection
If the compressor OLP is opened for 3S continuously, the system will stop as protection
If the OLP is resumed and compressor has stopped for 3min, the unit will be allowed to operate.
If the unit stops as compressor overload protection occurred for 3 times continuously, it can not
resume running automatically and display malfunction, it can resume by pressing ON/OFF, and the
times of compressor overload protection will be cleared after the compressor has run for 30min.
11.12
Operating the Unit from the ON/OFF Button
The ON/OFF button allows to operate the unit in AUTO mode, the microcomputer will monitor the
room temperature and select the (COOL, HEAT, FAN) mode automatically, and temperature/Fan
speed settings can not be changed.
11.13
Indoor Unit Controllers and Indicators
The following is schematic drawing for the display:
