Henry Catalogue 2010 - page 62

Industrial & Commercial Refrigeration Products
Oil Level Regulator:
The oil level regulator controls the oil level in the
compressor crankcase with a float operated valve. Oil level
regulators are designed to attach directly to the sight glass
housing on the compressor crankcases. All Oil Level
Regulators feature a standard 3 bolt 1-7⁄8" B.C. flange,
common to many Compressor Sight Glasses. Included
with each regulator are the “O” rings required to attach the
regulator to the 3 Bolt Compressor Sight Glass. Adapter
kits are available for compressors that have a different sight
glass configuration. The sight glass from the compressor or
supplied with an adapter kit, bolts to the second regulator
flange for visual observation of the oil level. The oil supply
line from the reservoir is connected to the 3/8” flare fitting
on top of the regulator. These regulators feature a 3⁄8" flare
equalization connection on the side of the regulator that
allows the crankcases to be interconnected. This maintains
the same pressure in all of the crankcases including any
compressor that is running. This prevents running
compressor (s) from siphoning the oil out of the idle
compressor (s). In order for 2 or more Oil Level Regulators
to be equalized, the compressors must have a common
suction line (same suction pressure) and be adjusted to the
same oil level. The 3⁄8" flare equalization connection is at
the half sight glass level. It helps prevent over filling of the
regulators caused by oil returning down the suction line to
an idle compressor. If a regulator fills up to a half sight
glass, the oil will be picked up by the equalization
connection and sent to the running compressor crankcase.
The equalization connection may be sealed off, if
equalization is not desired. It will not affect the function of
the regulator.
Each compressor has an Oil Level Regulator attached to
control the oil level in each individual compressor. The
regulators are supplied oil by the common Oil Reservoir,
which in turn is supplied oil by the Oil Separator. This Oil
Control System is recommended by the largest manufacturer
of semi-hermetic compressors in the world for field assembled
parallel systems.
The need for greater system flexibility, lower operating cost,
and energy conservation has brought about the growing
application of parallel compressor systems. This type of
system uses multiple compressors with one common
discharge line and common suction line (See Figures 1 and
2). Parallel systems have some potential problems, one of
them being the maintenance of the correct oil level in the
compressor crankcase at all operating conditions. Crankcase
oil level must be controlled. Our Oil Control System provides
this control as well as a method of regulating the oil level in
each individual crankcase. Our Oil Level Control System
eliminates the need for complex piping and valving. It does
not require that the compressors be level, or be the same
make or model. The Oil Control System consists of three
basic components:
Oil Separator
Oil Reservoir
Oil Level Regulators
Low Pressure Oil Control System:
Operating Pressure Differential: The difference of pressure
between the oil being fed to the oil regulator and the compres-
sor crankcase, where the regulator is controlling oil level.
Figure 1: Parallel Compressor System
Figure 2: Parallel Compressor System
with Satellite Compressor
Level Regulators
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