Alco 805133 -OM3-020 oil level regulator

Alco OM3-020 (805133) oil level controller – electronic oil level controller

The Alco OM3-020 oil level controller (order number 805133) is an electronic oil level controller for the automatic regulation of compressor oil levels in refrigeration and air-conditioning systems. It monitors the oil level via a sight glass and controls the oil replenishment to prevent insufficient lubrication and compressor damage.

Technical details

• Type: OM3-020
• Type: Electric oil level controller
• Inlet connection: 7/16"-20 UNF, flared
• Electrical connection: 3-pin
• Supply voltage: 24 V AC or 230 V AC (depending on the coil ordered)
• Relay switching capacity: potential-free, 230 V AC, max. 3 A
• MOPD (maximum operating differential pressure): 30 bar
• Max. operating pressure: 46 bar
• Fluid temperature: Inlet: min. 5 °C, Outlet: min. −20 °C, max. 80 °C
• Ambient temperature: −15 … +50 °C
• IP rating: IP65
• Weight (excluding packaging): 0.8 kg

Refrigerant compatibility

• Refrigerants: R134a, R404A, R407C, R450A, R452A, R448A, R449A, R507A, R513A, R410A, CO₂ (R744), R32, R452B, R454B, R454A, R454C, R455A, R1234ze(E), R1234yf
• A2L applications: permitted only with the OM0-CCL adapter

Materials

• Housing / adapter: aluminium alloy, brass, steel
• Screws: galvanised steel
• Sight glass: nickel-plated steel

Function and time delays

• Oil level detection via sight glass with electric sensor
• Filling function with time delay: filling after 10 s
• Alarm delay: 20 s (alarm if oil level remains too low)

Notes on power supply and wiring

• The oil level controller can be operated at 24 V AC or 230 V AC:
  • For 24 V: ESC-(W)24VAC coil plus OM3-P... connection cable
  • For 230 V: ESC-(W)230VAC coil plus connection cable with OM-23V-... transformer module
• Connection cable for alarm output (relay): OM3-N... (for both voltage variants)

Advantages and benefits

• Automatic oil level monitoring and replenishment – increases the operational reliability of compressors.
• Compatible with a wide range of HFC, HFO, CO₂ and A2L refrigerants.
• High IP65 protection rating – suitable for use in plant environments.
• Flexible power supply (24 V / 230 V) via suitable coil and cable combinations.

Important note:
For detailed wiring diagrams, lists of accessories and restrictions regarding A2L refrigerants (only with the OM0-CCL adapter), please refer to the manufacturer’s data sheet and the relevant accessories (ESC coils, OM3-P..., OM3-N..., OM-23V-...) must be consulted.