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(SV2)
(SV41)
(SV3A)
OFF
ON
(SV3E)
OFF
OFF
(SV3B)
(SV3D)
(SV3C)
Compressor 1
Compressor 1
Compressor 2
Compressor 2
Compressor 1
Compressor 2
(TK1)
(TK4)
(TK3)
(SV42)
(TK2)
(TD2)
(TD1)
Oil tank
Balance pipe
Packed valve
Oil
separator
No.
3
4
Item
Capacity control
Oil level detection
control
Operation explanation and applied data, etc.
1) The capacity request command received from the
indoor controller determines the inverter frequency
control of the outdoor unit.
2) The two compressors in each outdoor unit swap
starting order on successive operation.
1) Measurement of sensors TK1 to TK4 is used to
determine whether the correct amount of oil is
present in the compressor case.
2) A comparison of measurements taken from TK1/TK2
with that of TK3/TK4 is used to judge whether there is
sufficient oil in the compressor case. If there is
insufficient oil in the compressor case, the system
switches to the oil equalizing control method.
3) This control is performed during compressor opera-
tion.
Remarks
• Min. frequency: 26Hz
• The detection is per-
formed when one or both
compressors are oper-
ated.
• Adequate oil level
(Standard)
1) The oil level of com-
pressor 1 is adequate
when TK1 - TK3
> 15°C
2) The oil level of com-
pressor 2 is adequate
when TK2 - TK3 > 15°C