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Sequence of Operation
12. The compressor discharge temperature protection
12.1. If ODT≥239˚F, unit stops working for over temperature protection.
While ODT<212˚F, & after compressor stopped for 3 min, the unit can be restarted.
12.2 If ODT≥212˚F, the compressor will be frequency limited/reduced for over temperature protection.
12.3 If unit has a discharge over temperature stop working protection 6 times continuously, this protection can't be recovered
unless ON/OFF button is pressed. The unit will show failure code.
In the process of operation, once the compressor runs continuously more than 6 min, the counter of discharge over temperature
stop working protection will be reset to zero and start a new counting process.
The failure protection counter will be reset once the unit is switched off, or changed to fan mode.
13. The current protection
13.1 If the unit A/C working current is more than Limited current (ILC), the compressor will be frequency limited / reduced for
over current protection.
13.2 When unit A/C working current is more than Stopped current (ISC), AC unit stops working. Only when the compressor
stops for 3 min can the unit be restarted.
13.3 If unit faults 6 times for over current stop working protection continuously, the unit must be restarted to operate.
In the process of unit operation, once the compressor runs continuously more than 6 min, the counter of stop working protection
will be reset to zero and re start a new counting process.
14. IPM overheating protection
14.1. When IPM temperature T IPM ≥189˚F, the compressor will be frequency limited / reduced for IPM over temperature
protection.
14.2 When T IPM ≥203˚F, the AC unit stops working for AC system protection.
If T IPM 189˚F, and after compressor stopped for 3 min, the unit can be restarted.
14.3. If unit faults 6 times for IPM over temperature stop working protection continuously, the unit will need to be restarted.
In the process of operation, once the compressor runs continuously more than 6 min, the counter of over load stop working
protection will be reset to zero and re start a new counting process.
The failure and times for protection will reset once the unit is switched off, or changed to fan mode.
15. Complementary
15.1 ECO function is effective under cooling and heating mode only, and is enabled by default when unit is started up (even if the
ECO function is disabled manually). It will not enable ECO fucntion by default, if unit is started up by APP.
15.2 When the ECO function is set and the room temperature reaches the setting point , the indoor fan performs the following
operation after the compressor stopping.
a. the indoor fan will be shut down after running for 3 minutes at the set speed.
b. If the compressor does not meet startup conditions, the indoor fan will stop within five minutes.
c. The indoor fan will resume operation at low speed for 1 minute after 5 minutes stop time.
d. The indoor fan will operate in cycle according to the order of b and c, before the compressor startup.
e. After the compressor meets the starting conditi ons, the indoor fan will exit the above cycle, and start running at the
set speed immediately.
f. If the compressor does not meet the starting conditions after starting, the indoor fan runs at the set speed for 1
minute, and then cycles operation according to b and c. If the compressor start condition is reached after starting, the
fan runs at the set speed.
h. The above logic will be not applied to the fault shutdown.
16. Communication control
If Main PCB can't get signal feedback from Display PCB for 2 min continuously, AC unit stops working and shows E0 error code as Main
PCB/Display PCB communication failure. Once the Main PCB & Display PCB communication recovers, and the compressor has stopped
for 3 minutes , can the unit be restarted.
17. Calibration Test Mode: Within 3 min while indoor unit switch on, and set the unit as:
17.1 Cooling mode.
17.2 set temperature to 30
17.3 Mid fan speed. Press ECO button 7 times within 8s, the unit will change to calibration test mode, and the buzzer sounds 3
times.
21
OPERATION
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