gForce Ultra IOM
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Oil Level
When the compressor is running under stable conditions the oil level must be visible in the sight glass.
The presence of foam filling 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 is shut down, the level must be between 1/4 and 3/4 of the 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 POE oil 160SZ from new cans. Top-up the oil while the compressor is at
idle. Use a Schrader connector or any other accessible connector on the compressor suction line and
a suitable pump.
Variable Frequency Drive (VFD)
There are tremendous energy saving and application advantages available by applying a Variable
Frequency Drive (VFD) drive to compressor cooling. Variable speed control offers the ability to match
the cooling capacity to the actual need. Costs are reduced through direct energy savings of operating
at a lower speed. The drive can operate a variable speed compressor over a wider range. Other
advantages of the VFD are limiting the number starts and reduced start system shock thus reducing
peak energy demand and system wear. Below is a figure showing the VFD control display and some
general instructions required to charge the unit and monitor any alarms.
The local control panel (LCP) for the VFD drive is the combined display and keypad on the front of the
unit. The LCP has several user functions:
•
Start, stop, and control speed when in local control mode
•
Display operational data, status, warnings and cautions
•
Programming frequency converter functions
•
Manually reset the frequency converter after a fault when auto-reset is inactive
Summary of Contents for gForce Ultra
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