Robinair VacuMaster 15500 Vacuum Pump — 5 CFM, 35 Micron Two‑Stage HVAC/R Pump

The Robinair 15500 VacuMaster is a compact, two-stage rotary vane vacuum pump built for HVAC/R evacuation with a 5 CFM flow and factory 35 micron rating.

Designed for technicians who need a dependable, portable pump for air conditioning and refrigeration service, the 15500 combines a thermally protected motor, finned aluminum body, and an oil-sealed two-stage design to speed evacuation and resist overheating. Its intake and exhaust filtering, clear sight glass, angled drain, and multiple inlet fittings make routine service, oil changes, and connections fast and straightforward.

What makes the 15500 suitable for HVAC and refrigeration work?

This pump is engineered specifically for HVAC/R systems: the two-stage rotary vane arrangement increases vacuum depth and moisture removal while the 5 CFM displacement reduces pull-down time. The unit’s intake screen and internal exhaust filtration protect the pumping chamber and limit oil carryover.

• Two-stage rotary vane design for deeper vacuum and better moisture handling
• 5 CFM free air displacement to shorten evacuation time
• Intake screen and exhaust filter for longer pump life and cleaner operation
• Compatible with common refrigerant oils and refrigerant types

How easy is it to carry, connect, and maintain on a job site?

The 15500 is compact and light thanks to an aluminum housing, and a molded one-piece handle stays cool during operation for safe transport. Visible service features — sight glass, easy-fill port, and angled drain valve — simplify oil checks and changes on the workbench or truck.

• One-piece molded handle for comfortable carrying and stable transport
• Clear sight glass and accessible oil fill port for quick inspection
• Angled oil drain valve at reservoir bottom for thorough and fast oil removal
• Non-skid feet and compact 13-inch length for stable placement and storage

Which connections and performance specs should I expect?

Robinair equipped the pump with both 1/4" male flare and 3/8" ACME inlet fittings plus a 3/8" female flare to 1/2" ACME adapter to cover common hoses and manifolds. The 1/3 HP thermally protected motor runs on standard 115V/60Hz power for job-site compatibility.

• Factory rating to 35 microns for effective evacuation of typical systems
• 1/4" MFL and 3/8" ACME inlet fittings; includes 3/8" FFL x 1/2" ACME adapter
• 1/3 HP, 115V/60Hz thermally protected motor for safe continuous use
• Exhaust routed through handle to direct emissions away from the technician

How should I maintain the pump for best vacuum and longevity?

Regular oil changes and the right vacuum pump oil keep attainable vacuum low and extend service life. Robinair recommends changing oil after each use and using its Premium High Vacuum Pump Oil to minimize contamination and preserve seals and vanes.

• Change oil after each use to remove moisture and contaminants
• Use Robinair Premium High Vacuum Pump Oil for optimal performance
• Check sight glass during operation for oil level and clarity
• Keep intake screen clean and inspect exhaust filter periodically

Who is this for: The 15500 VacuMaster is aimed at HVAC/R technicians, mobile service professionals, and tradespeople who need a portable, reliable pump for evacuating residential and light commercial systems. It suits those who want a durable, easy-to-service tool that balances industry-standard fittings, a robust two-stage vacuum capability, and a compact footprint for frequent field use.