All About AC Vacuum Pump

AC Vacuum Pump

Mastering the AC Vacuum Pump: Your Comprehensive Guide to Vacuum Pump Aircon Mastery


Regardless of the sort of AC vacuum pump you have, the primary function is the same. It removes air, water, and vapour from a refrigeration system, cleaning it for maintenance or repairs, whether residential or commercial use.

After finding and fixing any leaks or problems, a technician always wants to recharge your ac unit system. To avoid the oil from seeping into the sludge and causing further issues, you must remove any unwanted water, air, or gas first.

Learn about vacuum pumps, including how they function, the parts they contain, how to use them, and why we need them. For HVAC engineers, this article explains the basic principles of single-stage and two-stage vacuum pumps.


High-Performance Vacuum Pumps


Major Parts of an AC Vacuum Pump

An air conditioner pump's motor, handle, compressor, and support base are all essential components. The pump's inlet extracts air from the unit and discharges it into the air.


The fan and protective shell are located at the back of the motor. You can find the stator, which has coils, in the motor. Copper coils spiral around the engine in an air conditioner pump, just like they do in other systems, creating an electrical current. It produces a magnetic field by current flowing through the coils.

The magnetic field of an electrical current rotates the rotor in a rotary vane and other pumps to create the vacuum effect.


UNLIKE A CONVENTIONAL HOUSEHOLD VACUUM, an HVAC pump needs an air compressor to create a vacuum, which creates a sucking force. Because the compressor produces less air pressure than the HVAC system, air floods the compression chamber, filling the space.

A more powerful air compressor will produce a better vacuum, but it will be loud. Humid weather also damages air compressors.

Support Base

The support base is for stability and is situated at the bottom of a pump.


The intake is in charge of extracting air from the air conditioning system. The inlet links the pump to the air conditioning system to begin the suction operation.

AC Vacuum Pump Types


Efficient Industrial Vacuum Pumps


There are three types of AC vacuum pumps to consider when assessing your alternatives: rotary vane, vacuum generators, and diaphragm pumps.

In addition to these options, you'll be able to choose between a single-stage and a two-stage pump.

The size of your unit and your overall budget will be the two most important deciding factors in determining the best HVAC vacuum pump for you.

Rotary Vane

The most prevalent type of HVAC pump is a rotary vane pump. A rotor positioned inside a cylindrical housing eliminates gas and moisture molecules by generating a suction that compresses the air inside the pump chamber.

This pump is one of a kind since it is oil-based and uses oil to push a vane to create a vacuum. Rotary vanes are an excellent, low-cost solution that can achieve a 99.9% vacuum in many versions.

Parts of a Rotary Vane AC Vacuum Pump

The same basic components are used in rotary vane HVAC vacuum pumps. Both oil-lubricated and dry-running rotary pumps will typically have the following basic elements. Simultaneously, there will be differences in parts dependent on design, size, or model.

  • Blades, or vanes
  • Cylindrical Housing
  • Rotor
  • Non-Return Valve
  • Suction Flange
  • Oil Sump
  • Motor
  • Oil Separator Housing
  • Float Valve
  • Oil
  • Filters

The rotary vane vacuum pump is simple to use in general, but it will require regular maintenance to keep it functioning properly. Because it runs on oil, it will require frequent oil changes to keep it running at its best for as long as possible. Keep an eye on the oil level to see if it's low or if there's any extra build-up. Even though managing the oil can be a headache, these pumps are the most efficient for a long time.

Vacuum Generator

Vacuum generators have a reputation for rapidly removing moisture from the air, making them ideal for HVAC stage vacuum pumps. It pulls air in and compresses as it travels through the nozzles of the vacuum generator at a high rate. Vacuum generators produce high-speed airflow but are short-lived since they necessitate airflow to draw.

Diaphragm Pump

Diaphragm pumps, also known as membrane pumps, use positive displacement to operate as HVAC vacuum pumps. It's a more eco-friendly option to water jet pumps.

  • It avoids waste by using dry compression.
  • The amount of maintenance required is minimal and uncomplicated.
  • Spare parts are available at a low cost.


Powerful Vacuum Generator Unit


How to Use AC Vacuum Pump?

Vacuum pumps for residential HVAC systems allow you to service your unit yourself. Typically, you will employ a professional HVAC technician to install your air conditioning unit pump. To utilise your pump, there are three general steps to take. Using HVAC vacuum pumps, follow these procedures to clean out your unit independently.

1: Set up the ac vacuum pump

Before using your air conditioner pump, double-check that everything is in working order to avoid any problems.

If you follow this three-part approach, your air conditioner will be completely evacuated, ready to be recharged or repaired as necessary.

1.2 Fill with Oil

If you're utilising a rotary pump, make sure it's filled with clean oil first. Check for a fill line on the interior edging of your pump's oil fill cap, which is normally on the top of the system. Fill the container with oil until it reaches that line, then close the lid tightly.

Make certain you're only putting oil in your pump for that purpose. Substituting with different mechanical lubricants may lower the overall performance of your pump and harm the machine.

1.3 Connect the Gauges

Connect all of your gauges to the ports before you begin. The meters will link the pump to your HVAC system's pressure ports. The majority of gauges and hoses are colour-coded and should be used as follows:

  • YELLOW: Connect your pump to the system.
  • RED: Connects to the high-pressure service port.
  • BLUE: Connects to the low-pressure service port.

1.4 Open Manifold Valves

Use the service port valves on the unit to open and close it. If you're in charge of maintaining the refrigerant lines, ensure your valves are closed, and your gauge displays little to no pressure.

2: Pull Your Pump

You can switch your pump on once you've verified that your unit is ready to use and that everything is connected properly.

2.2 Start Pump

To turn on your aircon pump, use the power switch provided. You ought to be able to hear your pump running once it is turned on.

If you're using your pump in the cold, ensure the intake ports are open until the pump reaches its normal speed. Close it off once it gets an average rate.

2.3 Open Side Gauge Valve

You can start sucking the air out of your unit with your vacuum system once the air conditioner vacuum pump is turned on and functioning. You'll need to open the valves on each side of each gauge to accomplish this.

To tell out which way you need to twist your valves to open them, see the instructions that came with your vacuum.

2.4 Wait for 15-30 minutes.

Allow your air conditioner's vacuum pump to run at full speed for at least 15 minutes, but no more than 30 minutes. This period helps your vacuum to remove the air from your system completely. Based on the manufacturer's recommendations, you can consult the operation manual for the exact amount of time required for your vacuum pump.

It would help if you keep your vacuum pump running until the measurement falls below 1,000 microns as a general guideline. For best results, attempt to get the measurement to 500 microns if possible.

3: Close Vacuum

It would be best if you started sealing up your vacuum after your vacuum pump has run for 15-30 minutes, relying on both your ac unit and your pump.

3.2 Close Low-Side Valve

The low-side gauge, which is usually blue, will be the first to close. Allow your pump to hold the suction for around fifteen minutes after that.

If your pump cannot hold it for this length of time, you most likely have a leakage somewhere and will need to replace a component within your pump.

3.3 Shut Down Pump

You can turn off your pump using the same suggested switch that you used to turn it on after 15 minutes of holding. Allow the vacuum to disengage before completely disconnecting the system.

3.4 Disconnect Vacuum

You can start detaching the hose connecting to your vacuum pump once it's entirely disengaged.

AC Vacuum Pump For Sale at HVAC Shop


AC Vacuum Pump: Cooling Power


AC vacuum pumps are highly developed, specialised equipment used in HVAC businesses to remove all oxygen from a sealed system. The most trusted brands of AC vacuum pumps are available here at HVAC Shop in Australia.