Heatcraft Refrigeration Products CLIMATE CONTROL CC-CUBZTB - Manual (Page 7)

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Octagon ® 4C Models
Bitzer Octagon 4C Models are rated from 3 to 20 HP. This rugged, compact
series utilizes wear resistant drive gear with PTFE coated bearings for especially
low friction, aluminum pistons of optimized geometry, connecting rods with
eccentric straps and generously dimensioned bearing surfaces. Bitzer’s centrifugal
lubrication system eliminates the need for an oil pump and provides optimum oil
supply to the compressor even under extreme operating conditions.
Centrifugal Lubrication
The centrifugal lubrication design employs a solid metal disc
mounted to the crankshaft (see cut-away) that distributes
oil into a reservoir at the end of the shaft. The oil then flows
through the shaft to the bearing surfaces.
Bitzer offers an optional Optical Oil Sensor (See OLC-K1 photo
below) that mounts to the outer cover of the compressor
and monitors oil level by means of an infrared light.
OLC-K1 Operating Principle
The OLC-K1 sensing device shines an infrared light into
the oil reservoir. If oil is present, the light is absorbed
and the compressor runs normally. If no oil is present,
the light reflects on the sensor, and the compressor
shuts off.
Bitzer 4B & 6B Models
Bitzer 4B through 6B Models are rated from 13 to 50
HP. This series features surface hardened crank shafts,
low friction bearings, aluminum pistons, hard chrome
plated piston rings and special wrist pin bearings.
The 4B & 6B models have a sealed main bearing and
generously sized oil pump. Our patented oil return
system ensures complete lubrication while reducing oil
circulation into the system. Efficient capacity control
is provided by unloader banks that can significantly
reduce energy consumption.
Bitzer Compressors
Features and Benefits