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7.2 Inverter unit
7.2.1 Outdoor running frequency and the control procedure
7.2.1.1 Compressor startup
Compressor running frquency range:
Outdoor temp.
~0ć 0ć~
Heat 20RPS 92RPS 20RPS 83RPS
Cool 20RPS 85RPM 20RPS 85RPS
Defrost 85rpm
Every time compressor is from OFF to ON, no matter how is the indoor target frequency,
compressor running frequency must be stay at 40Hz and 60Hz for 1 minutes (At outdoor discharging
temp. overhigh protection and compressor overcurrent protection, the frequency will be reduced),
and then rise up to the target frequency. After the unit is in normal, the above procedure is not
available.
Note: If the startup frequency for the first time is over 40Hz or 60Hz, it will stay at 40Hz and
60Hz for 1 minute. If the frequency is not over 60Hz, it will only stay at 40Hz for 1 minute. The other
conditions will not be limited.
7.2.1.2 Heating mode, cooling mode and dehumidification
After performing the compressor startup procedure, the unit will run according to the indoor
frequency.
2 minutes later, the unit will compensate the running frequency due to the relative condition.
7.2.1.3 Compressor frequency rising/reducing speed
Rapid rising/reducing frequency speed 1----1Hz/second
Slow rising/reducing frequency speed 1----1Hz/10 seconds
7.2.2 Outdoor motor control
Note: When the outdoor motor needs to change the class, there will be 20-second interval to
avoid the fan speed changing frequently.
7.2.2.1 Fan motor speed class has 7 steps, the rotation and class is as follow:
Class-0 Class-1 Class-2 Class-3 Class-4 Class-5 Class-6 Class-7
stop 160 260 360 460 560 760 860
7.2.2.2 Blowing remain heat after compressor shuts off
In cooling mode, when compressor shuts off, outdoor motor will enter speed Class-5
automatically, and will shut off after blowing remaining heat for 30 seconds.
7.2.2.3 Outdoor motor control in cooling/dry mode
z Speed range: class 1-7
z Fan motor locked rotor: When fan motor is requested to work, if fan speed is measured to be
below 50RPM and keep for 15 seconds, the compressor will stop, but 3 minutes later, it will
re-start up again. If within 20 minutes, the condition occurs 3 times, the unit will stop and alarm.
z When compressor starts up, the unit will adjust automatically in 3 minutes according to the
outdoor air inlet temperature, and 3 minutes later, the unit will adjust according to the outdoor
ambient temperature and compressor running frequency.
Fan speed chart in 3 minutes after compressor starts up:
Ambient temp. ~10 10~25 25~
Cool, dry Class-3 Class-5 Class-7
heat Class-7 Class-5 Class-3
Fan speed chart in 3 minutes after compressor starts up due to the ambient temp. and running
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