Compressor Start; Lubrication/Oil Level Monitoring; Oil Monitoring (Option); Vibrations And Frequencies - Bitzer 2KES-05 Instructions De Service

• Oil temperature (approx. 15 .. 20 K above ambient
temperature or suction-side saturation temperature).
• Setting and functions of safety and protection
devices.
• Setpoints of the time relays.
• Cut-out pressure values of the high-pressure and
low-pressure switches.
• Check if the shut-off valves are opened.
In case of compressor replacement
Oil is already in the circuit. It may therefore be neces-
sary to drain off some oil.
NOTICE
!
!
In case of larger oil quantities in the refrigerant
circuit: Risk of liquid slugging when the com-
pressor starts!
Maintain the oil level within the marked sight
glass area!

6.6 Compressor start

6.6.1

Lubrication/oil level monitoring

• Check the lubrication of the compressor directly after
the compressor start.
The oil level must be visible in the middle of the sight
glass (¼ to ¾ of the sight glass height).
• Check the oil level repeatedly within the first hours of
operation!
Compressor equipped with oil pump
• 4VE-6Y .. 4NE-20(Y)
• 4JE-13Y .. 4FE-35(Y)
• 6JE-22Y .. 6FE-50(Y)
• 8GE-50(Y) .. 8FE-70(Y)
• 4FE-5.F1Y .. 4CE-6.F1Y
• 4DE-7.F3Y .. 4CE-9.F3Y
• 4VE-7.F3Y .. 4NE-20.F4Y
• If necessary, check oil pressure (on the Schrader
connections of the oil pump, using a pressure
gauge)
Differential oil pressure (setpoint): 1.4 – 3.5 bar.
Minimum allowed suction pressure (at oil pump on suc-
tion side): 0.4 bar.
KB-104-7
6.6.2

Oil monitoring (option)

Oil pressure monitoring
• Protection device: Delta-PII.
• Electronic differential oil pressure switch – Option for
compressors with integrated oil pump, see chapter
Differential oil pressure switch Delta-PII (option),
page 20.
• Differential cut-out pressure: 0.65 bar.
• Cut-out time delay when differential oil pressure is
too low: 90 s ± 5 s.
For further information, see Technical Information
KT-170.
Oil level monitoring
• Protection device: OLC-K1.
• Opto-electronic oil level monitoring – Option for com-
pressors equipped with centrifugal lubrication, see
chapter Opto-electronic oil level monitoring OLC-K1
(option), page 20.
This system is recommended in particular for systems
with widely extended pipe work or in applications in
which larger quantities of oil may migrate to the suction
gas line or to the evaporator. For further details, see
Technical Information KT-180.
NOTICE
!
!
Risk of wet operation!
Maintain the discharge gas temperature well
above the condensing temperature: at least
20 K.
At least 30 K for R407A, R407F and R22.
NOTICE
!
!
Risk of compressor failure due to liquid slug-
ging!
Before adding larger quantities of oil: check the
oil return!
6.6.3

Vibrations and frequencies

Check the system carefully to detect any abnormal vi-
bration. In the case of strong vibrations, take mechan-
ical measures (e.g. use pipe clamps or install vibration
dampers).
Speed-controlled compressors
• 2DES-3.F1Y
• 4FE-5.F1Y .. 4CE-6.F1Y
• 4DE-7.F3Y .. 4CE-9.F3Y
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