Robinair 15500 VacuMaster Economy Vacuum Pump for Air Conditioning and Refrigeration Service,

The Robinair 15500 VacuMaster is a two-stage rotary vane vacuum pump designed for air conditioning and refrigeration service. Powered by a 1/2 HP, 115V motor, it produces 5 CFM of free air displacement and is factory rated down to 35 microns. This level of pull ensures deep evacuation and reliable moisture removal across systems running CFC, HCFC, and HFC refrigerants alongside common lubricants like mineral, ester, PAG, and alkyl benzene oils.

Job-site usability is a clear focus in the overall design. Measuring 13 inches long, the unit uses an aluminum housing and finned surfaces to dissipate heat quickly while keeping overall weight manageable. The molded one-piece handle stays cool to the touch during operation, allowing immediate transport when work wraps up. Exhaust vapors are filtered internally and directed out through the handle, keeping oil mist away from the technician.

Routine maintenance and connections are straightforward. Robinair equips the pump with a 1/4-inch MFL and 3/8-inch ACME inlet, plus an included 3/8-inch FFL by 1/2-inch ACME adapter. An intake screen protects internal components from foreign debris, while a clear sight glass, top oil fill port, and angled drain valve make monitoring and draining oil quick.

Keep in mind that achieving peak performance requires frequent upkeep. Robinair recommends changing the oil after every use and using its specific high vacuum oil, which is sold separately. The 115V/60 Hz motor also limits you to standard electrical outlets or properly matched power sources on site.

Verdict: The Robinair 15500 is a reliable, fast-evacuating choice for HVAC and refrigeration technicians who need a versatile, portable pump for residential or commercial service work.

• Free Air Displacement: 5 CFM
• Vacuum Rating: Factory rated to 35 microns
• Motor: 1/2 HP, 115V/60 Hz, thermally protected
• Pump Design: Two-stage offset rotary vane
• Overall Length: 13 inches
• Housing Material: Aluminum
• Inlet Fittings: 1/4 inch MFL and 3/8 inch ACME
• Included Adapter: 3/8 inch FFL x 1/2 inch ACME
• Refrigerant Compatibility: CFC, HCFC, HFC
• Lubricant Compatibility: Mineral oil, ester oil, alkyl benzene oil, PAG oil

A great fit if you:

• Service air conditioning and refrigeration systems using CFC, HCFC, or HFC refrigerants
• Need a high-vacuum pump capable of reaching 35 microns with a fast 5 CFM flow rate
• Want a compact, lightweight aluminum pump that is easy to transport between jobs
• Prefer exhaust vapors routed away from your working area via the handle

Consider something else if you:

• Do not have access to standard 115V/60 Hz electrical power on your job sites
• Prefer a pump that comes packaged with pump oil right out of the box

What refrigerants and oils can this pump handle?
It is designed for systems using CFC, HCFC, and HFC refrigerants combined with mineral, ester, PAG, or alkyl benzene lubricant oils.

What inlet connections are included?
The pump features 1/4-inch MFL and 3/8-inch ACME inlet fittings, along with a 3/8-inch FFL by 1/2-inch ACME adapter.

Does this pump come with vacuum pump oil?
No, pump oil is available separately in pint, quart, and gallon sizes, and Robinair recommends changing it after each use for best performance.

How does the exhaust filtration work?
An internal exhaust filter separates oil vapor from the air flow and vents it through the carrying handle, directing it away from the technician.