York YHKMXH009BARX-FX Service Manual page 242

After oil return in cooling mode, the quit condition of refrigerant eliminated:
OR
Oil return procedure in heating mode:
Send oil return signal
Inverter compressor
Outdoor motor
4-way valve
All expansion valves
All indoors
Quit condition of oil return:
OR
1 minute later after oil return is over
＆
OR
Max. 10 minutes
oil return begins
60s
indicated FQCY
0HZ
5s
AUTO
ON
450pulse
auto angle
ON
OFF
Max. 9 minutes (E)
OR Td Tc
Ts Tc2AVE
＆
Running for min. 5 minutes(E)
Td Tc
‐ ＞30℃
Ts Tc2AVE
‐ ＞30℃
Tc2AVE ＜ 35
‐ ℃
oil return FQCY
AUTO (TC control)
OFF
350pulse(E)
‐ ＜20 ℃ for 30s continuously(5 minutes later, begin
to count)
＜15℃for 30s continuously(5 minutes later,
‐
begin to count)
240
oil return over
60s soft startup
0HZ
AUTO
15s
450pulse
auto angle
anti-freezed startup