Requirements
• The compressors are delivered with < 100ppm moisture level.
• At the time of commissioning, system moisture content may be up to 100ppm.
• During operation, the lter drier must reduce this to a level between 20 and 50ppm.
Solutions
To achieve this requirement, a properly sized and type of drier is required. Important selection criteria’s include:
• driers water content capacity,
• system refrigeration capacity,
• system refrigerant charge.
For new installations of compressors with polyolester oil, Danfoss recommends using the Danfoss DML (100%
molecular sieve) solid core lter drier.
Assembly line procedure
Compressor storage
Store the compressor not exposed to rain, corrosive or ammable atmosphere between -35°C (-31°F) and 70°C
(158°F) when charged with nitrogen and between -35°C (-31°F) and Ts max value (see section Pressure equipment
directive 2014/68/EU) when charged with refrigerant.
Compressor holding charge
Each compressor is shipped with a nominal dry nitrogen holding charge between 0.3bar (4 psi) and 0.7bar (10psi)
and is sealed with elastomer plugs.
Respect the following sequence to avoid discharge check valve gets stuck in open position:
• Remove the suction plug rst
• Remove the discharge plug afterwards
An opened compressor must not be exposed to air for more than 20 minutes to avoid moisture is captured by
the POE oil.
Handling
Each Danfoss DSH scroll compressor is equipped with two lift rings on the top shell.
• Always use both these rings when lifting the compressor.
• Use lifting equipment rated and certied for the weight of the compressor or compressor assembly.
• A spreader bar rated for the weight of the compressor is highly recommended to ensure a better load distribution.
• The use of lifting hooks closed with a clasp is recommended.
• For tandem and trio assemblies, use a spreader bar and all compressor rings as shown in picture below.
• Never use the lift rings on the compressor to lift the full unit.
Maintain the compressor in an upright position during all handling manoeuvres (maximum of 15° from vertical).
© Danfoss | Climate Solutions | 2022.10 AB288965961751en-001402 | 59
Scroll compressors, DSH090 to DSH600 | Application
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