Trane 4TXK6512G1000AA Service Manual page 169

Process control chart of oil return:
Inverter comp. Indication frequency 60s
Starting
OD fan auto
4-way valve
OD expansion valve auto opening
IN fan ON
The longest 9 minutes
O R
O R
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
Driving speed
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)
Send oil return signal
0HZ
ON
O F
450pulses
O F
Td-TC<20°C lasts 30 minutes (it will start to judge after oil return lasting 30 seconds.)
Start
Oil return frequency A Hz (E)
0HZ 5s
Auto adjustment according to cooling mode
F
450pulses 300pulses (E)
137
End
60s Soft
Auto
2 5 s
Auto opening
Cold wind prevention mode start
500 pulse
PPS