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OUTDOOR TECHNICAL OVERVIEW
B-15
ENGLISH
Operations
Send oil return signal oil return begins oil return over
60s ref. eliminated 30s
Oil return frequency auto frequency
Low frequency
Inverter compressor auto frequency
350 pulses(E)
running indoor EEV auto angle auto angle
120 pulses(E)
80(E)
stopped indoor EEV OFF angle 5(E) OFF angle 5(E)
Outdoor motor AUTO AUTO (TC or ambient temp. control) AUTO
running indoor motor AUTO AUTO (set fan speed) AUTO
stopped indoor motor STOP STOP STOP
4-way valve OFF OFF OFF
Oil Return in Cooling Mode:
Oil Return Cycle
When the compressor is operating at low load
conditions, or the operating frequency has
been below 70Hz continuously for 4 hours,
the system will enter the oil return cycle. This
ensures that oil which may be trapped within
the system at low loads will return to the
compressor crankcase.
If a 4-hour low speed run time has occurred,
the oil return procedure initiates by
automatically ramping up the compressor
speed to at least 85Hz for a pre-set time, up
to a 9-minute maximum. The higher speed
will wick hiding oil into the now faster-moving
refrigerant and deposit it in the compressor
crankcase. To avoid occupant discomfort
when the oil return cycle is active, the indoor
fan shuts o.
Should an error code result in a system
shutdown, the oil return cycle timing will
resume when the error code has been cleared.
＆ ‐ ＞ ℉（℃）
‐ ＞ ℉（℃）
＜
Oil Return Exit Conditions, Heating:
‐ ＜
＆ ‐ ＜
Send oil return signal oil return begins oil return over
Inverter compressor indicated FQCY 60s oil return FQCY 60s soft startup
0HZ 0HZ
5s
Outdoor motor AUTO AUTO
AUTO (TC control)
4-way valve ON
OFF 15s
450 pulses 450 pulses
350 pulses
All expansion valves auto angle auto angle
Indoor fan motor ON
OFF Cold air proving mode
℉（℃）
℉(℃)
℉(℃)
＆ ‐ ＞ ℉（℃）
‐ ＞ ℉（℃）
＜
Oil Return Exit Conditions, Heating:
Max. 9 minutes (E)
OR OR Td Tc‐ ＜ for 30s continuously(5 minutes later, begin
to count)
＆ Ts Tc2AVE‐ ＜ for 30s continuously(5 minutes later,
begin to count)
Running for min. 5 minutes
℉（℃）
68℉(20 ℃)
59℉(15 ℃)
Oil Return Exit Conditions, Cooling:
1 minute later after oil return is over
＆ Td Tc‐ ＞86℉（30 ℃）
OR OR Ts Tc2AVE‐ ＞86℉（30 ℃）
Tc2AVE＜
Max. 10 minutes
‐ ＜
＆ ‐ ＜
-31℉（-35 ℃）
℉(℃)
℉(℃)
Oil Return in Heating Mode
Oil Return in Cooling Mode
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