Installation
Heat shield
C
B
A
Leak detection must be carried out using a
mixture of nitrogen and refrigerant or nitrogen
and helium, as indicated in the table below.
Never use other gasses such as oxygen, dry air
or acetylene as these may form an inflammable
mixture.
Pressurize the system on HP side first then LP
side.
• Apply heat evenly to area A until the brazing
temperature is reached. Move the torch to
area B and apply heat evenly until the brazing
temperature 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 flow the full
circumference of the joint.
• Move the torch to area C only long enough to
draw the brazing material into the joint, but not
into the compressor.
• Remove all remaining flux once the joint has
been soldered with a wire brush or a wet cloth.
Remaining flux would cause corrosion of the
tubing.
Ensure that no flux 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 PSH 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 fitting
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. 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 distributor.
For specific applications not covered herein,
please contact Danfoss for further information.
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
inflammable mixture.
Do not exceed the following pressures:
• Maximum compressor test pressure (low
side): 33.3 bar (g)
• Maximum compressor test pressure (high
side): 48.7 bar (g)
• Maximum pressure difference between high
& low side of the compressor: 35 bar
Pressurize the system on HP side first then LP side
to prevent rotation of the scroll. Never let the
pressure on LP side exceed the pressure on HP
side with more than 5 bar.
On PSH019-023-026-030-034-039 models which
have an internal non return valve in discharge
fitting or if an external non return valve is present
on the discharge line, we advise to pressurize
the system not quicker than 4.8 bar/s to allow
pressure equalization between LP and HP side
over scroll elements.
System pressure test
Leak detection
Leak detection with refrigerant
Leak detection with a mass spectrometer
Nitrogen & R410A
Nitrogen & Helium
Note 1
: Leak detection with refrigerant may be forbidden in some countries. Check local regulations.
Note 2
: The use of leak detecting additives is forbidden as they may affect the lubricant properties.
33
FRCC.PC.022.A4.02
Application Guidelines
