GENER
AL INFORMA
TION
PR
ODUC
T INFORMA
TION
SY
STEM DESIGN
ORDERING INFORMA
TION
INTEGR
ATION INT
O SY
STEM
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/0.02 in.Hg) 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 before evaporator, in liquid phase while
compressor is running by slowly throttling liquid
in.
Never bypass safety low pressure switch.
For more detailed information see
“Recommended refrigerant system charging
practice“ FRCC.EN.050.
Several tests have been 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.
• Insulation resistance is measured with a 500 V
DC megohm tester and must be higher than 1
megohm.
Recommendations:
• Additional dielectric test is not recommended
as it may reduce motor lifetime. Nevertheless, if
such as test is necessary, it must be performed
at a lower voltage.
• Insulation resistance test can be done.
• 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
R
R
52
FRCC.PC.045.A7.02
Summary of Contents for DSH Series
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