Process control chart of oil return:
The longest 9 minutes
Td-TC<20°C lasts 30 minutes (it will start to judge after oil return lasting 30 seconds.)
OR
Ts-TM<15°C lasts 30 minutes (it will start to judge after oil return lasting 30 seconds.)
The shortest running 3 minutes
9.4.5 Control of operating EEV
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
Largest opening 500 pulse
Driving speed PPS
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)
137
Auto opening OD expansion valve auto opening
IN fan ON
O F
Cold wind prevention mode start
Send oil return signal Start End
Inverter comp. Indication frequency 60s
Oil return frequency A Hz (E)
Starting
0HZ 0HZ 5s
OD fan auto Auto
Auto adjustment according to cooling mode
4-way valve ON
450pulses 450pulses 300pulses (E)
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