A
PPLICATION
GUIDELINES
42
FRCC.PC.007.B5.02
I
NSTALLATION
When brazing the compressor fi ttings, do not
overheat the compressor shell, which could se-
verely damage certain internal components due
to excessive heating. Use of a heat shield and/
or a heat-absorbent compound is highly recom-
mended. Due to the relatively sizable tubing and
fi tting diameters a double-tipped torch using
acetylene is recommended for brazing operation
on SH compressors.
For rotolock version compressors, solder sleeves
are available.
For brazing the suction and discharge connec-
tions, the following procedure is advised:
y
.
Make sure that no electrical wiring is connected
to the compressor.
y
.
Protect the terminal box and compressor
painted surfaces from torch heat damage (see
diagram).
y
.
Remove the Tefl on gaskets when brazing ro-
tolock connectors with solder sleeves.
y
.
Use only clean refrigeration-grade copper tub-
ing and clean all connections.
y
.
Use brazing material with a minimum of 5% sil-
ver content.
y
.
Purge nitrogen or CO
2
through the compres-
sor in order to prevent against oxidation and
fl ammable conditions. The compressor should
not be exposed to the open air for extended
periods.
y
.
Use of a double-tipped torch is recommended.
y
.
Apply heat evenly to area
until the brazing
temperature is reached. Move the torch to area
and apply heat evenly until the brazing tem-
perature has been reached there as well, and
then begin adding the brazing material. Move
the torch evenly around the joint, in applying
only enough brazing material to fl ow the full cir-
cumference of the joint.
y
.
Move the torch to area
only long enough to
draw the brazing material into the joint, but not
into the compressor.
y
.
Remove all remaining fl ux once the joint has
been soldered with a wire brush or a wet cloth.
Remaining fl ux would cause corrosion of the
tubing.
Ensure that no fl 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 mois-
ture from the air. The compressor must therefore
not be left open to the atmosphere for a long pe-
riod of time. The compressor fi 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 se-
rious personal injury. Pressure 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 distribu-
tor. For specifi c applications not covered herein,
please contact Danfoss for further information.
Compressor connection
System pressure test
Always use an inert gas such as nitrogen for pres-
sure testing. Never use other gasses such as oxy-
gen, dry air or acetylene as these may form an in-
fl ammable mixture. Do not exceed the following
pressures:
B
C
A
heat shield
Maximum compressor test pressure (low side)
30.2 bar (g) for SH180 to 380
33.3 bar(g) for SH090 to 184
Maximum compressor test pressure (high side)
45 bar (g)
Maximum pressure diff erence between high & low side
of the compressor
37 bar
