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COMPRESSOR PROTECTIVE DEVICES
INFRA-RED OIL CONTROLLER
The function of the Infra-Red Oil Controller is to control the oil level
in the compressor crankcase using proven optical sensor
The I-ROC-LV Oil Regulator can be used with Low and High Pressure Oil
Management Systems on a single compressor or on multi-compressor racks.
The I-ROC-LV Oil Regulator is fitted to the sight glass housing of the
compressor and has an integral sight glass that allows visual inspection of
the crankcase oil level. The regulator comes ready to mount to several
popular compressors using the 3 or 4 bolt, 1-7/8” BC, universal flange. Oil
Level Regulator Adapter Kits are available for additional applications. The
I-ROC-LV Oil Regulators are suitable for use with ASHRAE 34 Class A1
refrigerants and their associated oils, as well as other industrial fluids non-
corrosive to aluminum, steel, brass, and synthetic rubber.
How it works
The oil is regulated at 1/2 Sight Glass using variable pulse timing. When a
low oil condition is detected, oil begins to pulse into the compressor at the
time intervals shown in the Operation Table. As the duration of oil filling
increases, the oil pulse time increases to better meet the oil demand. If
demand is not satisfied after 2 minutes of continuous oil feed, a low level
alarm is initiated by means of a fail-safe electrical contact. During the alarm
condition the regulator will continue to pulse feed oil. The alarm will reset
automatically if the oil returns to 1/2 glass. The alarm contact may be used to
shut down the compressor in the event of a low level condition.
Patented optical sensor technology*
SAE flare oil connection
Fixed oil level control at 1/2 sight glass
Low level alarm circuit
Replacement parts available
Adapters available for most popular compressor models
Universal flange compressor connection
Max working pressure: 650 PSI (45 Bar)
Max differential pressure: 350 PSI (24 Bar)
Max ambient temp: 140°F (60°C)
Max fluid temp: 176°F (80°C)
Supply voltage: 24V, 60HZ
Operating current: 0.6 Amps@24V
Alarm contact rating: 5A@240VAC, SPDT
Henry Technologies' I-ROC-LV Oil Level Controller meets the requirements
of UL 429 and is USR and CNR recognized by Underwriters Laboratories,
Materials of Construction
The valve body is made of aluminum. The inlet connection is made of brass.
The outlet adapter is made of plated steel and the electronics enclosure is
made of molded plastic.
Installation - Notes
1. To protect the Oil Level Regulator from system debris, an Oil Strainer, Oil
Filter or Oil Filter Drier is recommended.
2. The operating differential oil pressure should be within the range of the
3. The 1/2 sight glass oil level must be in line with the compressor
4. If the alarm output is used to shut down a compressor, an external time
delay should be fitted into the circuit.
5. The electronic module will be damaged if the 24V supply voltage is
6. Power to the unit should be maintained during compressor running, stand-
by and shutdown modes.
7. Full instructions are given in the Product Instruction Sheet included with
1/4 SAE Flare Inlet
Universal Flange Outlet
A B C D E F
OP-03-1/2 1.62 3.45 2.69 1.31 3.12 4.30 1.3
Oil Level Oil Fill Duration Oil Fill Pulse Timing Oil LED Alarm
No oil flow
Low 0 - 60 seconds 1.0 sec ON/1.8 sec OFF Blinking No
Low 61 - 120 seconds 2.0 sec ON/2.0 sec OFF Blinking No
Low 120+ seconds 3.0 sec ON/3.0 sec OFF Blinking Yes