Oil Level Checking And Top-Up - Danfoss VZH028 Application Manuallines

Application Guidelines
Oil level checking and
top-up
40
FRCC.PC.034.A2.02
Installation
In installations with good oil return and line
runs up to 15 m, no additional oil is required. If
installation lines exceed 15 m, additional oil may
be needed. 1 or 2% of the total system refrigerant
charge (in kg) can be used to roughly define the
required oil top-up quantity (in liters) but in any
case the oil charge has to be adjusted based on
the oil level in the compressor sight glass.
When the compressor is running under stabilized
conditions, the oil level must be visible in the
sight glass.
The presence of foam filling in the sight glass
indicates large concentration of refrigerant in the
oil and / or presence of liquid returning to the
compressor.
Single compressors
The oil level can also be checked a few minutes
after the compressor stops, the level must be
between ¼ and ¾ of sight glass.
When the compressor is off, the level in the
sight glass can be influenced by the presence of
refrigerant in the oil.
Always use original Danfoss PVE Oil from new
cans.
Top-up the oil while the compressor is idle. Use
the schrader connector or any other accessible
connector on the compressor suction line and
a suitable pump. See news bulletin "Lubricants
filling in instructions for Danfoss Commercial
Compressors. "