4. Oil level
detection
control
1)Judgment as to whether an optimum amount of oil is present in the compressor
cases is made on the basis of the temperature readings of sensors TK1 to TK5.
This control function is performed by the header unit and each follower unit
individually.
2)In concrete terms, judgment is based on the relationship between the temperature
measurements provided by TK1, TK2, on the one hand, and those provided by
TK4 or TK5, on the other. If there is depletion, oil equalization control takes over.
3)This control function is performed whenever at least one compressor is in
operation.
• Oil level detection takes
place regardless of the
number of compressors,
whether one or two.
• Rough guide for oil level
judgment
1) If TK1 - TK4 57.2 °F
(14°C), oil level of
compressor 1 is optimum.
2) If TK2 - TK4 57.2 °F
(14°C), oil level of
compressor 2 is optimum.
Item Description of operation, numerical data, and other information Remarks
− 58 −
(SV2）
(SV3D)
(SV3B)
(SV3A)
(TD1)
(TK4)
(TK5)
(SV3C)
SV
(TD2)
(SV42)
(TK2)
SV
(SV41)
(TK1)
SV
SV
SV
SV
0
SV
Com-
pressor
2
Com-
pressor
1
Oil Header
Balance pipe
Service valve
SV
(SV3E)
Oil separator
High-
pressure
switch
High-
pressure
switch
SV
Solenoid
valve
Capillary
tube
Check
valve
Check
joint
Strainer
Symbol
Distributor
Temperature
sensor
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