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Service Manual

ManualsBrandsHaier ManualsAir ConditionersFlexFit Series 17400 BTU Dual-Zone Mini Split System
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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
MULTI:
D: Entering Conditions
When the compressor running frequency is lower than 58Hz (E) continuously for 8 hrs, the system
will enter the oil return cycle.. In the course of mode changeover, manual unit stop or protective
unit stop, the time will be accumulative. After the compressor restarts up, the time will be counted
continuously. In a continuous 8 hrs, if the compressor running frequency is not less than 72Hz for
over 10 minutes continuously, the accumulative time will be cleared. Also after the heating
defrosting, the time will be cleared.
F: Error Code Occurrence During Oil Return Cycle
If the system stops during an oil return cycle due to an error code, the cycle timing will resume
when the system restarts after the error is cleared.
If there is a switch from heating to cooling, or from cooling to heating during the oil return cycle
timing, and the system stops due to an error code, the oil return cycle will occur immediately
when the error code is cleared.
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, Cooling:
1 minute later after oil return is over
＆ Td Tc‐ ＞86℉（30 ℃）
OR OR Ts Tc2AVE‐ ＞86℉（30 ℃）
Tc2AVE＜
Max. 10 minutes
Oil Return in Heating 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
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
-31℉（-35 ℃）
68℉(20 ℃)
59℉(15 ℃)
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
Oil Return in Heating 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
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
-31℉（-35 ℃）
68℉(20 ℃)
59℉(15 ℃)
Oil Return in Heating Mode
Oil Return in Cooling Mode