211
Volt increase (Resume)
198
190 MAX=78Hz 190
180
172 MAX=70Hz 172
167
Stop
Volt decrease (Limited Frequency)
8.2.2 AC Amp Protection
The outdoor control board checks the compressor current and do over-current protection.
If the compressor current is over the scheduled value, the system will stop and all indoor units will display
malfunction code.
Note: 1. In order to prevent protection due to too big LRA when compressor starts, the outdoor control board begins
to check the compressor current after 10 seconds.
2. If current protection happens, the compressor will stop and restart 3 minutes later.
8.2.3 High-pressure Protection and Low-pressure Protection
The High-pressure switch and Low-pressure switch are installed at suction pipe and discharge pipe separately. And
users can select to install. Normally, the high-pressure switch is cut down when higher than
425Psi (3.3Mpa Cut
down, 2.4Mpa Resume). While the low-pressure switch is cut down when lower than 7Psi (0.05Mpa
On, 0.15Mpa Resume).
Under high-pressure protection or low-pressure protection, the compressor will stop and restart 3
minutes later.
8.2.4 Outdoor Unit communication protection
8.2.4.1 Communication protection between indoor unit and outdoor system chip
If the outdoor unit can’t receive the indoor signal for 30 seconds, then the indoor units are judged as no starting and
there is no alarm signal. If the indoor units send signal to system chip for 2 minutes and no feedback signal is
received, then judge as communication malfunction.
8.2.4.2 Communication protection between outdoor system chip and inverter chip
If can’t receive signal or receive wrong signal for over 2 minutes, Indoor/Outdoor Unit stops operation. When the
signal is right, Indoor/Outdoor Unit restarts.
8.2.5 Outdoor condenser high temperature protection
Under cooling mode, if
T3〉65℃ for 3 minutes, the compressor will stop. When T3〈52℃, the protection
is not valid.
When protection is released, the compressor restarts 3 minutes later.
Volt(V)
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