Application guidelines
51
FRCC.PC.021.A5.22
Installation
Oil level checking and
top-up
In installations with good oil return and line
runs up to 65.6 ft, no additional oil is required. If
installation lines exceed 65.6 ft, additional oil may
be needed. 1 or 2% of the total system refrigerant
charge (in weight) can be used to roughly define
the required oil top-up quantity 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.
The oil level can also be checked a few minutes
after the compressor stops. 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 POE oil 160SZ 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”.
Commissioning
The system must be monitored after initial start-
up for a minimum of 60 minutes to ensure proper
operating characteristics such as:
• Proper metering device operation and
desired superheat readings
• Suction and discharge pressure are within
acceptable levels
• Correct oil level in compressor sump
indicating proper oil return
• Low foaming in sight glass and compressor
sump temperature 18°F above saturation
temperature to show that there is no
refrigerant migration taking place
• Acceptable cycling rate of compressors,
including duration of run times
• Current draw of individual compressors
within acceptable values (max operating
current)
• No abnormal vibrations and noise.
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