York YHKMXH009BARX-FX Service Manual page 240

Quit condition of oil return:
＆
OR
Oil return procedure in heating mode:
Send oil return signal
Inverter compressor indicated FQY
outdoor motor
4-way valve
PMV auto open angel
all indoor motor ON
Quit condition of oil return
OR
1 minute later after oil return is over
Td‐Tcm＞30℃
OR Ts ‐Tc＞30℃
Tc＜‐35℃
Max. 10 minutes
60s
0HZ
5s
auto
ON
OFF
450pulse
OFF
Max. 9 minutes（E ）
OR Td‐Tcm＜20℃ for 30s（5 minutes later, begin to count ）
T s ‐Tc＜15℃ for 30 S（5 minutes later, begin to count）
＆
Running for min. 5 minutes （ E ）
oil return beginning
oil return frequency
auto（TC control）
300pulse （E ）
238
oil return over
120s
Soft startup
0HZ
auto
15s
450 pulse
auto open angle
anti-freeze startup