Nstallation; System Cleanliness; Compressor Handling And Storage; Compressor Mounting - Danfoss MLM Series Application Manuallines

A G
PPLICATION UIDELINES

System cleanliness

Compressor handling and
storage

Compressor mounting

Compressor holding charge

Tube brazing procedure

Brazing material

I

NSTALLATION

Each MLZ/MLM compressor is shipped with print-
ed Instructions for installation. These Instructions
can also be downloaded from our web site
The refrigeration system, regardless of the type of
compressor used, will only provide high effi ciency
and good reliability, along with a long operating
life, if the system contains solely the refrigerant
and oil it was designed for. Any other substances
within the system will not improve performance
and, in most cases, will be highly detrimental to
system operations.
The presence of non-condensable substances and
system contaminants, such as metal shavings, sol-
der and fl ux, have a negative impact on compres-
sor service life. Many of these contaminants are
Compressors are provided with a lifting lug. This
lug should always be used to lift the compressor.
Once the compressor is installed, the lifting lug
should never be used to lift the complete instal-
lation. The compressor must be handled with
Maximum inclination from the vertical plane,
while operating must not exceed 7 degrees. All
compressors are delivered with 4 rubber grom-
mets and metal sleeves. Compressors must al-
Each compressor is shipped with a nominal dry
nitrogen holding charge between 0.4 bar and
0.7 bar, and is sealed with elastomer plugs. The
plugs should be removed with care to avoid oil
loss when the holding charge is released. Remove
the suction plug fi rst and the discharge plug af-
Do not bend the compressor discharge or suc-
tion lines or force system piping into the com-
pressor connections, because this will increase
For copper suction and discharge fi ttings, use
copper-phosphorus brazing material. Sil-Fos®
and other silver brazing materials are also accept-
FRCC.PC.015.A4.02
www.danfoss.com or directly from:
http://instructions.cc.danfoss.com
small enough to pass through a mesh screen and
can cause considerable damage within a bearing
assembly. The use of highly hygroscopic PVE oil in
MLZ compressors requires that the oil be exposed
to the atmosphere just as little as possible.
During the manufacturing process, circuit con-
tamination may be caused by:
• Brazing and welding oxides,
• Filings and particles from the removal of burrs
in pipe-work,
• Brazing fl ux,
• Moisture and air.
caution in the vertical position, with a maximum
inclination of 15° from vertical. Store the compres-
sor between -35°C and 55°C, not exposed to rain
or corrosive atmosphere.
ways be mounted with these grommets. Recom-
mended torque for mounting bolts: 11 Nm (±1
Nm).
terwards. The plugs shall be removed only just
before connecting the compressor to the installa-
tion in order to avoid moisture entering the com-
pressor. When the plugs are removed, it is essen-
tial to keep the compressor in an upright position
to avoid oil spillage.
stresses that are a potential cause of failure. Rec-
ommended brazing procedures and material, are
described on following page.
able. If fl ux is required for the brazing operation,
use coated rod or fl ux core wire. To avoid system
contamination, do not brush fl ux on.
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