Haier FlexFit Pro Series Service Manual page 104

Process control chart of oil return:
Send oil return signal
Inverter comp. Indication frequency
Starting
OD fan auto
4-way valve
OD expansion valve auto opening
IN fan ON
The longest 9 minutes
Td-TC<20°C lasts 30 minutes (it will start to judge after oil return lasting 30 seconds.)
OR
OR
Ts-TM<15°C lasts 30 minutes (it will start to judge after oil return lasting 30 seconds.)
The shortest running 3 minutes
6.2.5 EEV control:
1. Set one general EEV on outdoor unit board, control the EEV by indoor unit, outdoor unit board is regarded as
executing agency.
(1) Reset the electrify valve: act one full-closed action when the first electrifying of the outdoor valve board.
(2) Power source: switch power source, outdoor unit 13.5V (input voltage of the EEV) are the same line.
2. The electronic property of the EEV
Remark: considering the application of MAXI, the EEV of each model should be larger, when operating as one
outdoor unit with one indoor unit, the opening of the EEV should be stable lower than 200 steps. Leave the system
adjustment margin of MAXI.
3. The initialization action of the EEV.
Driving speed of the EEV: Open-way: 31.25 PPS (32MS) , Closed-way: 31.25 PPS (32MS)
full open action and full closed action of EEV: full open action: open as 470 pulse (E) , full closed action: after
closing 540 pulse, repeat three times (close as 60 pulse and open as 5 pulse, it means stop at opening of 5)
60s
0HZ
5s
ON
OFF
450pulses
OF
Largest opening
Driving speed
Start End
Oil return frequency A Hz (E)
Auto adjustment according to cooling mode
300pulses (E)
Cold wind prevention mode start
500 pulse
PPS
100
FlexFit Pro
60s Soft
0HZ
Auto
25 s
450pulses
Auto opening