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Compressor VZH 088/117/170
When oil return management is enabled, the frequency converter performs an oil boost when the
compressor is below 3000 RPM (100 Hz). The oil boost will happen every 60 minutes for 30 seconds when
the compressor speed is below 3000 RPM (100 Hz). When “Hands On” mode is selected, the oil return
management will not be active, even if the parameter is set to be on. The minimum/maximum speed for the
compressor is 1500 RPM (50 Hz)/6000 RPM (200Hz).
Oil boost
– This function is controlled by the Variable Frequency Drive converter (VFD-02)
to return oil
from the system to the compressor when oil balance cannot be reached or maintained in a defined time
period.
Oil solenoid
– The compressor VFD-02
controls the oil solenoid (
), which will then actuate the
valve. This solenoid valve set up helps optimize the oil circulation and improves efficiency of the
compressor at all running speeds. Control parameters are factory preset but are accessible on the
parameter list as read-only values.
Oil level sensor
– This sensor (
) is an optical sensor that monitors the compressor’s internal oil
level. The sensor will send a signal to the VFD controller. A warning will be displayed on the HMI if a low oil
level condition exists. If the oil level is low, the system will enter a secondary oil boost. If the oil level is still
low after this boost cycle, the system will shut down and display a fault.
If the oil level is low, add oil as necessary when the compressor is idle. Use POE oil from new containers.
DO NOT CONTAMINATE THE OIL.
Connect an oil hand pump to the Schrader valve connection on the
compressor. Carefully add oil until the oil level sensor is satisfied after the compressor has been off for at
least 5 minutes. Repeat until the oil level sensor is satisfied for at least 30 minutes of unit operation.
Figure 27 - Oil Level Sensor and Solenoid
Oil
Solenoid
Oil Level
Sensor
