FRCC.PC.017.A1.02
22
A
PPLICATION
GUIDELINES
I
NSTALLATION
Compressor connection
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. 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).
•
Use only clean refrigeration-grade copper tub-
ing and clean all connections.
•
Purge nitrogen or CO
2
through the compressor
in order to prevent against oxidation and fl am-
mable 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 braz-
ing 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 fl ow the full circum-
ference 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 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 PVE oil used in Performer
®
Heat Pump scroll
compressors is highly hygroscopic and will rap-
idly absorb moisture from the air. The compres-
sor must therefore not be left open to the atmos-
phere for a long period of time. The compressor
fi tting plugs shall be removed just before brazing
the compressor.
Before eventual unbrazing the compres-
sor 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 distribu-
tor. For specifi c applications not covered herein,
please contact Danfoss for further information.
Moisture obstructs the proper functioning of both
the compressor and the refrigeration system.
Air and moisture reduce service life and increase
condensing pressure, which causes abnormally
high discharge temperatures that are then ca-
pable of degrading the lubricating properties of
the oil. The risk of acid formation is also increased
by air and moisture, and this condition can also
lead to copper plating. All these phenomena may
cause both mechanical and electrical compres-
sor failures. The typical method for avoiding such
problems is a vacuum pump-down executed
with a vacuum pump, thus creating a minimum
vacuum of 500 microns (0.67 mbar). Please refer
to Bulletin "Vacuum pump down and dehydration
procedure".
Be sure to follow all government regulations re-
garding refrigerant reclamation and storage.
Vacuum evacuation and
moisture removal
Heat shield
C
B
A
