York YHKMXH009BARR-FX Service Manual page 87

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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
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1 minute later after oil return is over
Td Tc
＆
OR Ts Tc2AVE
Tc2AVE＜ 35
Max. 10 minutes
oil return begins
60s
indicated FQCY
0HZ
5s
AUTO
ON
OFF
450pulse
auto angle
ON
OFF
Max. 9 minutes (E)
OR Td Tc
Ts Tc2AVE
＆
Running for min. 5 minutes(E)
‐ ＞30℃
‐ ＞30℃
‐ ℃
oil return FQCY
AUTO (TC control)
350pulse(E)
‐ ＜20 ℃ for 30s continuously(5 minutes later, begin
to count)
＜15℃for 30s continuously(5 minutes later,
‐
begin to count)
-86-
oil return over
60s soft startup
0HZ
AUTO
15s
450pulse
auto angle
anti-freezed startup