How To Make a Vacuum Pump from Old Compressor

This video show my own way of making a usable vacuum pump. This video will show you how to make a vacuum pump out of a old refrigerator compressor. This pump can be used to pull a vacuum on different things and can be used to do things like pump up balls and bicycle tires. Also potential for many other things too.

Don’t spend hundreds of dollars on a brand-new vacuum pump! In this video, I demonstrate how to convert a scrap refrigerator compressor into a fully functional DIY vacuum pump for HVAC repairs, degas chambers, or shop projects.

Learn the step-by-step process of prepping the copper lines, brazing Schrader service valves, wiring a standard start relay (RO41), and testing vacuum draw using manifold gauges.

⏱️ Timestamps / Chapters

00:00 - Project Overview: Converting a Scrap Fridge Compressor
00:40 - Tools & Materials Needed (Valves, Solder, Relay)
01:48 - Prepping Copper Tubing & Removing Debris
02:43 - Prepping Schrader Service Valves (Removing Valve Cores)
03:36 - Soldering & Brazing the Intake & Output Lines
08:14 - Reinstalling the Valve Core & Cooling
08:31 - Wiring the Compressor Relay (PRO41 / RO41 Start Relay)
09:10 - Connecting Manifold Test Gauges & Vacuum Lines
10:13 - Powering On & Live Vacuum Draw Test
11:23 - Shutoff Procedure & Sealing the Vacuum System

🛠️ Tools & Parts Used in This Build

HVAC Universal Start Relay (RO41 / PRO41)
1/4" Access Service Schrader Valves (Braze-on)
15% Silver Solder / Brazing Rods & Flux
MAPP / Propane Torch Kit
HVAC Manifold Gauge & Hose Set
Valve Core Removal Tool
Wire Strippers & 1/4" Spade Connectors

⚠️ Safety Note

Always ensure scrap compressors are properly evacuated of any residual refrigerant and oil before heating or brazing. Follow local environmental regulations and standard electrical safety guidelines.

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