Figure 60: Heavy
HEAVY
do not lift
manually
Figure 61: Correct
Figure 62: Incorrect
1
2
3
Figure 63: Handling
3
2
1
cc-0066
Slings
Spreader bars
Frame
Piping assembly
Good practices for piping assembly is a pre-requisite to ensure compressor life time (system cleanliness, brazing
procedure etc.)
Table 34: System cleanliness
Circuit contamination possible cause
Requirement
Brazing and welding oxides
During brazing, flow nitrogen through the system.
Particles and burrs
Remove any particles and burrs generated by tube cutting and hole drilling.
Moisture and air
Use only clean and dehydrated refrigeration grade copper tubing.
Opened compressor must not be exposed to air more than 20 minutes to avoid moisture captured by oil.
Brazing procedure:
• Brazing operations must be performed by qualified personnel.
• Make sure that no electrical wiring is connected to the compressor.
• To prevent compressor shell and electrical box overheating, use a heat shield and/or a heat-absorbent compound.
• Clean up connections with degreasing agent.
• Flow nitrogen through the compressor.
• Use flux in paste or flux coated brazing rod.
• Use brazing rod with a minimum of 5% silver content.
• It is recommended to use double-tipped torch using acetylene to ensure a uniform heating of connection.
• For discharge connections brazing time should be less than 2 minutes to avoid NRVI damages if any.
• To enhance the resistance to rust, a varnish on the connection is recommended.
DSF compressors connectors are made of steel copper coated, which benefit to protect against corrosion and
facilitate adhesion during brazing operation.
As per standards practice in the refrigeration industry, Danfoss Commercial Compressor recommend to use of
silver
cadmium free solder
alloy and
flux
(added or flux coated rods). The significant silver content in these brazing alloy
will help the brazing operation, providing an excellent fluidity and a limited heating temperature. It will bring also a
good resistance to corrosion, a proper elongation compatible with system vibration, and good behavior under
thermal variation improving the strength of connection and limiting fractures and refrigerant leaks. (Crucial with
A2L refrigerants).
A typical content of 30 – 40% Ag (Silver) is recommended by Danfoss.
© Danfoss | Climate Solutions | 2023.06
AB309735209512en-000603 | 55
Scroll compressors, DSF090 to DSF530 | Application