Commissioning - Danfoss HHP Series Application Manuallines

Application guidelines

Commissioning

Oil level checking and
top-up
Installation
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
super heat readings,
• Suction and discharge pressure are within
acceptable levels,
• Correct oil level in compressor sump indicating
proper oil return,
In installations with good oil return and line
runs up to 66 ft, no additional oil is required.
If installation lines exceed 66 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
FRCC.PC.003.A5.22
• 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.
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 oil from new cans.
Compressor series
SM
SY
SZ
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».
Oil
Mineral oil 160P
P.O.E. 320 SZ
P.O.E. 160 SZ
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