Danfoss DSH090 Application Manual page 61

Scroll compressors, DSH090 to DSH600 | Application
Figure 68: Brazing procedure
Before eventual un-brazing of the compressor or any system component, the refrigerant charge must be
removed and the installation vacuumed (especially with A2L refrigerants).
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 38: System pressure test and leak detection
Maximum compressor test pressures
Maximum compressor test pressure high side (HP)
Maximum compressor test pressure low side (LP)
(1) (1)
The maximum pressurizing speed must be respected to ensure pressure equalization between LP and HP side over scroll elements. 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" TI-026-0302.
Refrigerant charging
Initial charge:
© Danfoss | Climate Solutions | 2022.10
1
1
DSH090-105-120-140-161-184
53.6 bar (g) (777 psig)
HP-LP<37 bar (537 psi)
36.7 bar (g) (532 psig)
LP-HP<5bar (73psi)
Maximum speed 4.8bar/s (70psi/s)
(1)
Heat shield
DSH240-295 -381-485-600
53.6 bar (g) (777 psig)
HP-LP<37 bar (537 psi)
34.3bar (g) (497psig)
LP – HP <5bar (73psi)
Maximum speed 4.8bar/s (70psi/s)
AB288965961751en-001402 | 61
(1)