Haier 1U71S2SG1FA Service Manual page 223

Quit condition of oil return:
Quit condition of oil return:
OR
OR
Oil return procedure in heating mode:
Oil return procedure in heating mode:
Inverter compressor indicated FQY
outdoor motor
4-way valve
PMV auto open angel
all indoor motor ON
Quit condition of oil return
Quit condition of oil return
Max.9 minutes (E)
OR
&
1 minutes later after oil return is over
1 minute later after oil return is over
Td-Tcm ＞ 30°C
&
Td‐Tcm＞30℃
＆
OR OR Ts‐Tc＞30℃
Ts-Tc ＞ 30°C
Tc＜‐35℃
Ts-Tc ＜ -35°C
Max. 10 minutes
Max.10 minutes
Send oil return signal
60s
0HZ
auto
ON
OFF
450pulse
OFF
Max. 9 minutes（E）
Td-Tcm ＜ 20°C for 30s (5 minutes later, begin to count)
OR
OR OR Td‐Tcm＜20℃ for 30s（5 minutes later, begin to count）
Ts-Tc ＜ 15°C 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 (E)
Running for min. 5 minutes（E）
oil return beginning
oil return frequency
5s
auto（TC control）
300pulse （E）
220
oil return over
120s
Soft startup
0HZ
auto
15s
450 pulse
auto open angle
anti-freeze startup