Haier 1U48IN1EAB, Руководство по обслуживанию

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Single Split
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4.4 Power protection
The PCB has set the power protection, zero crossing detecting the L2, L3 order by combined the
hardware and software, L1 and N as base phase, L1, L2, L3 as correct phase sequence.
When power on detecting the 3-phase power, the unit will delay 10 second into running
For the power supply (L1, L2, L3) : positive phase, reversed phase, lack phase--- testing
immediately after power on
1) Signal detection for more than 5 seconds without any signal, the lack of phase reported
failures;Signal recovery, then back to normal.Signal detection phase inverse for more than 5
seconds, then submitted to the phase sequence fault;Signal recovery, then back to normal.(phase
sequence can adjustable through hardware selection, adjustable, phase sequence fault output
compressor 2 ,close compressor 1, otherwise the vice)
2) After failure, compressor stop, the compressor protection function for 3 minutes.
Power lack L1 ,N or the location N and L2, L3 is wrong, the outside PCB will not be able to
work;L1, N position error will be reported to the communication failures E9.
4.5 High/Low Pressure protection (cooling only unit without this function)
The high pressure protection is no blocking time ,once the compressor is running, the system will
check the pipe pressure. If pipe pressure is over high, high pressure switch has activated more
than 30 seconds, compressor, outdoor motor will stop and 3 minutes later it will resume. If within
30 minutes there are stop phenomenon 3 times because of pressure over high, the compressor
will stop and LCD will display E6. only shut off and powered on again, the protection can be
cancelled. Detecting the high pressure during in standby and defrosting state, it will alarm error
once the signal disconnect over 30 seconds.
Low pressure protection
(1) After compressor running for 3 minutes, if low pressure switch has activated for 15 seconds
continuously, compressor will stop and alarm.
(2) Check the low pressure switch when compressor is stop, the compressor will not run if low
pressure switch act, low pressure switch has activated more than 30 seconds, LCD will display
Low pressure abnormal
(3) In defrosting and in 6 minute after defrost is over , low pressure switch will not be checked.
(4) In heating, compressor run and outdoor motor stop, low pressure switch will be shielded.
(5) Low pressure protection can be resumable when power-off.
4.6 3-minutes protection for compressor
After compressor stops, it cannot be started until 3 minutes later. During the machine’s running,
if the time not more than 3 minutes after power is off, the compressor cannot be restarted until 3
minutes later after it is powered on again
4.7 ensor broken down protection
(1) Check if sensor breaks down
After compressor has run for 2 minutes, the unit will check the sensor, Outdoor board checks the
sensor in short circuit or in open circuit or near to short/open circuit for 2 minutes continuously,
then it will adjust the sensor broken down.