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Heat shield
The use of self-flux alloys (as phosphorous alloys) is not recommended by Danfoss. This type of brazing require a
higher working temperature, that may overheat the connectors, damaging the thin layer of copper, resulting in
phosphides creation and joint zone embrittlement.
For more detailed information see "Brazing technique for compressors connectors"
.
Before eventual un-brazing of the compressor or any system component, the refrigerant charge must be
removed and the installation vacuumed.
System pressure test and leak detection
The compressor has been strength tested and leak proof tested (<3g/year) at the factory. For system tests:
• Always use an inert gas such as Nitrogen or Helium.
• Pressurize the system on HP side first then LP side.
• Do not exceed the following pressures indicated in table below.
Table 35: System pressure test and leak detection
Maximum compressor test pressures
DSF090-200
DSF270-325-485-530
Maximum compressor test pressure high side (HP)
53.6 bar (g) (777 psig)
HP-LP<37 bar (537 psi)
53.6 bar (g) (777 psig)
HP-LP<37 bar (537 psi)
Maximum compressor test pressure low side (LP)
36.7 bar (g) (533 psig)
LP – HP <5 bar (73 psi)
Maximum speed 4.8 bar/s (70 psi/s)
34.3 bar (g) (497 psig)
LP – HP <5 bar (73 psi)
Maximum speed 4.8 bar/s (70 psi/s)
(1)
(1)
DSF compressors have an internal non return valve fitting: the maximum pressurizing speed must be respected to ensure pressure
equalization between LP and HP side over scroll elements.
(1)
DSF compressors have an internal non return valve fitting: the maximum pressurizing speed must be respected to ensure pressure
equalization between LP and HP side over scroll elements.
Vacuum evacuation and moisture removal
Requirements:
• Never use the compressor to evacuate the system.
• Connect a vacuum pump to both the LP and HP sides.
• Evacuate the system to a pressure of 500 μm Hg (0.67 mbar/0.02 in.Hg) absolute.
Recommendations:
• Energized heaters improve moisture removal.
• Alternate vacuum phases and break vacuum with Nitrogen to improve moisture removal.
For more detailed information see “Vacuum pump-down and dehydration procedure”
.
Refrigerant charging
Initial charge:
Scroll compressors, DSF090 to DSF530 | Application
© Danfoss | Climate Solutions | 2023.06
AB309735209512en-000603 | 56