41
FRCC.PC.007.B8.02
Application guidelines
Installation
For brazing the suction and discharge
connections, the following procedure is advised:
.Make sure that no electrical wiring is connected
to the compressor.
.Protect the terminal box and compressor
painted surfaces from torch heat damage (see
diagram).
.Remove the Te on gaskets when brazing
rotolock connectors with solder sleeves.
.Use only clean refrigeration-grade copper
tubing and clean all connections.
.Use brazing material with a minimum of 5%
silver content.
.Purge nitrogen or CO
2
through the compressor
in order to prevent against oxidation and
ammable conditions. The compressor should
not be exposed to the open air for extended
periods.
.Use of a double-tipped torch is recommended.
.Apply heat evenly to area A until the brazing
temperature is reached. Move the torch to
area and apply heat evenly until the brazing
temperature has been reached there as well,
and then begin adding the brazing material.
Mov
e the torch evenly around the joint, in
applying only enough brazing material to ow
the full circumference of the joint.
.Move the torch to area only long enough to
draw the brazing material into the joint, but not
into the compressor.
.Remove all remaining ux once the joint has
been soldered with a wire brush or a wet cloth.
Remaining ux would cause corrosion of the
tubing.
In addition, for discharge connections equipped
with a non return valve integrated in discharge
tting (SH180 to SH485) the direction of the
torch has to be as described on the picture, and
maximum brazing time should be less than 2
minutes to avoid NRVI damages.
Ensure that no ux is allowed to enter into the
tubing or compressor. Flux is acidic and can cause
substantial damage to the internal parts of the
system and compressor.
The polyolester oil used in SH compressors
is highly hygroscopic and will rapidly absorb
moisture from the
air. The compressor must
therefore not be left open to the atmosphere
for a long period of time. The compressor tting
plugs shall be removed just before brazing the
compressor. The compressor should always be
the last component brazed into the system
Before eventual unbrazing the compressor or
any system component, the refrigerant charge
must be removed from both the high- and
low-pressure sides. Failure to do so may result in
serious personal injury. Press
ure gauges must be
used to ensure all pressures are at atmospheric
level.
For more detailed information on the appropriate
materials required for brazing or soldering, please
contact the product manufacturer or
distributor.
For speci c applications not covered herein,
please contact Danfoss for further information.
System pressure test Always use an inert gas such as nitrogen for
pressure testing. Never use other gasses such as
oxygen, dry air or acetylene as these may form
an in ammable mixture. Do not exceed the
following pressures
:
Maximum compressor test pressure (low side)
30.2 bar (g) for SH180 to 485
33.3 bar(g) for SH090 to 184
Maximum compressor test pressure (high side)45 bar (g)
Maximum pressure di erence between high & low side
of the
compressor
37 bar
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