Reduce moisture in the system
Excessive air and moisture
•
can increase condensing pressure and cause
excessively high discharge temperatures.
•
can create acid giving rise to copper platting.
•
can destroy the lubricating properties of the oil.
All these phenomena can reduce service life
and cause mechanical and electrical compressor
failure.
Requirements
Solutions
VLZ compressors are delivered with < 100 ppm
moisture level.
At the time of commissioning, system moisture
content may be up to 100 ppm.
During operation, the filter drier must reduce this
to a level between 20 and 50 ppm.
To achieve this requirement, a properly sized
and type of drier is required. Important selection
criteria include:
•
driers water content capacity,
•
system refrigeration capacity,
•
system refrigerant charge.
For new installations with VLZ compressors with
POE oil, Danfoss recommends using the Danfoss
DML (100% molecular sieve) solid core filter drier.
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