Assembly line procedure
Vacuum evacuation and
moisture removal
Refrigerant charging
Dielectric strength and
insulation resistance tests
Requirements:
• Never use the compressor to evacuate the
system.
• Connect a vacuum pump to both the LP and HP
sides.
• Evacuate the system to a pressure of 500 μm Hg
(0.67 mbar) absolute.
Recommendations:
• Energized heaters improve moisture removal.
• Alternate vacuum phases and break vacuum
with Nitrogen to improve moisture removal.
For more detailed information see “Vacuum
pump-down and dehydration procedure”
TI-026-0302.
Initial charge:
• For the initial charge, the compressor must not
run.
• Charge refrigerant as close as possible to the
nominal system charge.
• This initial charging operation must be done in
liquid phase between the condenser outlet and
the filter drier.
If needed, a complement of charge can be done:
• In liquid phase while compressor is running by
slowly throttling liquid in.
• On the low pressure side, as far away as possible
from the compressor suction connection.
• Never bypass safety low pressure switch.
For more detailed information see
“Recommended refrigerant system charging
practice“ FRCC.EN.050.
The tests are performed on each compressor at
the factory between each phase and ground.
• Dielectric strength test is done with a high
potential voltage (hi-pot) of 2Un +1000V AC
at least, and leakage current must be less than
5 mA. Additional tests of this type are not
recommended as it may reduce motor lifetime.
Nevertheless, if such a test is necessary, it must
be performed at a lower voltage.
• Insulation resistance is measured with a 500 V
DC megohm tester and must be higher than 1
megohm.
• The presence of refrigerant around the
motor windings will result in lower resistance
values to ground and higher leakage current
readings. Such readings do not indicate a faulty
compressor. To prevent this, the system can be
first operated briefly to distribute refrigerant.
Do not use a megohm meter nor apply
power to the compressor while it is under
vacuum as this may cause internal damage.
R
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FRCC.PC.012.A7.02
GENER
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PR
ODUC
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SY
STEM DESIGN
ORDERING INFORM
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INTEGR
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Содержание Danfoss Maneurop MT
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