Emerson OMB / OMC Series Oil Management Control
The Emerson OMB/C Series Oil Management Control is designed to prevent compressor burnout and system downtime by maintaining a proper compressor crankcase oil level. It is ideal for all brands of semi-hermetic compressors and is recommended for Copeland Scroll™ compressors.
Image: A product image of the OMB D120S Oil Management Control unit, showing its compact design with a silver fitting and a clear sight glass.
Key Features
- Compressor lockout feature alerts repeated low oil for early system diagnosis and resolution.
- Easy monitoring with visual alarm and multi-color status lights.
- Hall-effect sensing technology, unlike optical sensors, eliminates false detection of possible oil foaming.
- System debris retention magnet for reliable control.
- Oil level float ball in sight glass allows quick visual indication.
- Simple to install with adapters available for various compressor types.
- OMC Series offers optional side sight glass for oil level view from multiple directions, multiple voltage ratings to eliminate the need for a step-down transformer, and a self-contained electrical enclosure with conduit connections for field service wiring.
OMB | C Series Oil Management Control Specifications
| SPECIFICATIONS | OMB | OMC | OMC NH3 | OMC CO2 |
|---|---|---|---|---|
| Maximum Working Pressure (MWP) | 870 psig (60 bar) | 1885 psig (130 bar) | 0/350 psig (0/24 bar) | 0/1450 psig (0/100 bar) |
| Solenoid min/max OPD | ||||
| Supply Voltage | 24V 50/60 Hz | 120V or 220-240V, 50/60 Hz | 24, 120V OR 220-240V, 50/60 Hz | 24, 120V OR 220-240V, 50/60 Hz |
| Solenoid Coil | EMF | EMF | EMF | EMF |
| Current Consumption | 0.6 Amp (24V) | 0.15 Amp (120V), 0.07 Amp (220-240V) | 0.6 Amp (24V) 0.15 Amp (120V) 0.07 Amp (220-240V) | 0.6 Amp (24V) 0.15 Amp (120V) 0.07 Amp (220-240V) |
| Time Delay for Low Level Signal | 10 Seconds | 5 Seconds | 120 Seconds | 120 Seconds |
| Time Delay After Setpoint Recovery | ||||
| Alarm Delay Time (Including Alarm Contact) | ||||
| Alarm Switch | SPDT | SPDT | SPDT | SPDT |
| Alarm Contact Rating | 10A @ 120VAC 50/60 Hz, 5A @ 250VAC 50/60 Hz, 3A @ 30VDC | |||
| Refrigerant Compatibility | Class A1 (incl. subcritical CO2) | Ammonia | Ammonia | Transcritical CO2 |
| Refrigerant Temperature | -40°F/C to 180°F (82°C) Maximum | -40°F/C to 120°F (49°C) Maximum | -40°F/C to 120°F (49°C) Maximum | -40°F/C to 120°F (49°C) Maximum |
| Ambient Temperature - Storage | ||||
| Ambient Temperature - Intermittent Duty | ||||
| Oil Supply Fitting | 1/4" Male SAE (Brass) | 1/4" Male SAE (Stainless Steel) | 1/4" Male SAE (Stainless Steel) | 1/4" Male SAE (Brass) |
| Agency | UL/CUL File Number SA8547 | |||
Model Number Nomenclature
The model number is constructed using the following components:
- SERIES: OMC (Oil Management Control) or OMB (Oil Management Control) or OMC (Oil Management Control Multi-Voltage)
- CONFIGURATION: D (Dual Sight Glass), JB (Junction Box), MO (Grommet with Leads), S (Single Sight Glass)
- COIL VOLTAGE: 24 (24V 50/60 Hz), 120 (120V 50/60 Hz), 240 (240V 50/60 Hz)
- APPLICATION: K5 (For Copeland K5 Compressor with Adapter - Omit for Standard), NH3 (Ammonia), CO2 (Transcritical CO2)
- STRAINER: S (Strainer - Omit for No Strainer)
Example: OMC D120CO2S
Note: For aftermarket replacement on a K5 compressor, use oil injection tube 30240-3.
Note: It is recommended that an oil filter be installed on the oil inlet line to further protect the system from contaminants even when the oil management control contains an inlet strainer.
OMB | C Series Oil Management Controls
| COIL VOLTAGE | APPLICATION | CONFIGURATION | INLET STRAINER | MODEL NUMBER | ITEM NUMBER |
|---|---|---|---|---|---|
| 24 VAC, 50/60 Hz | Standard | Junction Box | No | OMB JB24 | 065365 |
| 24 VAC, 50/60 Hz | Standard | Grommet With Leads | No | OMB MO24 | 065366 |
| 120 VAC, 50/60 Hz | Standard | Dual Sight Glass | Yes | OMC D120S | 096806 |
| 220-240 VAC, 50/60 Hz | Standard | Dual Sight Glass | Yes | OMC D240S | 096807 |
| 24 VAC, 50/60 Hz | Transcritical CO2 | Dual Sight Glass | Yes | OMC D24CO2S | 1815412 |
| 120 VAC, 50/60 Hz | Transcritical CO2 | Dual Sight Glass | Yes | OMC D120CO2S | 1815404 |
| 220-240 VAC, 50/60 Hz | Transcritical CO2 | Dual Sight Glass | Yes | OMC D240CO2S | 1808095 |
| 24 VAC, 50/60 Hz | Ammonia | Dual Sight Glass | No | OMC D24NH3 | 066992 |
| 120 VAC, 50/60 Hz | Ammonia | Dual Sight Glass | No | OMC D120NH3 | 066938 |
| 220-240 VAC, 50/60 Hz | Ammonia | Dual Sight Glass | No | OMC D240NH3 | 066939 |
OM Series Parts List
| DESCRIPTION | MODEL NUMBER | ITEM NUMBER |
|---|---|---|
| OM Strainer Assembly 1/4" Inlet Filter Screen | X-11176-7 | 048638 |
| AMI / OM Sight Glass O-Rings 50 Count | PS-1525-2 | 020877 |
| OM Mounting O-Rings (3 Pieces) | KS-30368-1 | 064812 |
| OM Oil injection tube for K5 compressors | 30240-3 | 30240-3 |
See oil controls adapter page for available adapters.
