REACH OUT TO US
An HVAC Vacuum Pump is designed to help remove air and moisture from the refrigerant lines. It is designed for use in heating, ventilation, and air conditioning (HVAC) systems. This is a crucial step in the HVAC installation and maintenance process because air and moisture can negatively impact the performance and efficiency of the system
Welch HVAC Vacuum Pumps are used to remove gas, vapors, and other contaminants from refrigeration systems after refrigerant recovery and repair of cooling systems. To ensure the Air Conditioning system is free from contaminants before recharging it with refrigerant, one must maintain a deep and complete vacuum.
Our industrial duty HVAC pumps are engineered to deliver deep vacuum for fast evacuation and dehydration. They can pump down quickly reaching 40 microns in hours; not days or weeks like you might experience with a light duty pump.
Welch refrigeration and vacuum pump for HVAC come in two pump styles. Our CRVpro direct-driven pumps, Welch's HVAC cooling and vacuum pumps, are portable and powerful.
Free Air Displacement (CFM/m³h)
0-6 / 0-10.2
Ultimate Vacuum Pressure (Torr/mbar)
1.5x10⁻³/2x10⁻³
Free Air Displacement (CFM/m³h)
0-6 / 0-10.2
Ultimate Vacuum Pressure (Torr/mbar)
1.5x10⁻³/2x10⁻³
Free Air Displacement (CFM/m³h)
0-6 / 0-10.2
Ultimate Vacuum Pressure (Torr/mbar)
1.5x10⁻³/2x10⁻³
Free Air Displacement (CFM/m³h)
0-6 / 0-10.2
Ultimate Vacuum Pressure (Torr/mbar)
1.5x10⁻³/2x10⁻³
Free Air Displacement (CFM/m³h)
6-12 / 10.2-20.4
Ultimate Vacuum Pressure (Torr/mbar)
3x10⁻³/4x10⁻³
Free Air Displacement (CFM/m³h)
12-24 / 20.4-40.8
Ultimate Vacuum Pressure (Torr/mbar)
3x10⁻³/4x10⁻³
Free Air Displacement (CFM/m³h)
12-24 / 20.4-40.8
Ultimate Vacuum Pressure (Torr/mbar)
3x10⁻³/4x10⁻³
Free Air Displacement (CFM/m³h)
24 + / 40.8+
Ultimate Vacuum Pressure (Torr/mbar)
3x10⁻³/4x10⁻³
Free Air Displacement (CFM/m³h)
24 + / 40.8+
Ultimate Vacuum Pressure (Torr/mbar)
3x10⁻³/4x10⁻³
CRVpro models of rotary vane vacuum pumps are portable but powerful and come with forced oil lubrication and a protective coating against the corrosive effects of chemicals on key internal parts. CRVpro pumps are used where high flow is required, and a lightweight and small footprint is desired for service applications such as rooftop HVAC equipment and RTUs.
In addition to vacuum performance and evacuation time, there are several factors to consider when selecting a vacuum pump for refrigeration systems. Here are a few features of Welch HVAC pumps that you might consider when making your selection.
With our quick pump down and fast delivery, Welch HVAC pumps are the ultimate solution to your refrigeration servicing needs. If you are looking for assistance, reach out to our application specialists, who are happy to help you make a right decision.
In the world of HVAC systems, servicing large chillers presents unique challenges. Reliable vacuum evacuation is essential for maintaining these systems' performance. Welch, a reputable vacuum pump brand, offers solutions tailored for large chiller service. In this guide, we'll explore key factors for selecting Welch HVAC Vacuum Pumps for large chillers, including pump capacity, maintenance, vacuum levels, and durability. Whether you're a seasoned HVAC professional or new to the field, this guide equips you to handle large chiller systems effectively using Welch's technology.
| Application | Pump Requirements |
| Cold Storage Systems | • Handles long pump‑down times effectively • Handles high water vapor loads • Draws a very deep vacuum |
| Industrial & Commercial Chillers | • Draws a very deep vacuum • Handles high water vapor loads • Heavy‑duty design for continuous industrial operation |
| Rooftop Units (RTU) | • Portable and powerful design • Draws a very deep vacuum • Large oil reservoir to dilute contaminants |
| Lithium Bromide Absorption Chillers | • Handles harsh salt‑laden water vapor • Withstands accidental ingestion of salt solution • Recirculates clean fraction of vacuum pump oil |
| Ammonia Refrigeration Systems | • Compatible seals and gaskets for ammonia refrigerant • Handles high moisture and vapor loads • Designed for deep vacuum and reliable dehydration |
Download our brochure that assists you in selecting the right pump for your HVAC/Refrigeration service application.
Most manufacturers recommend pulling down to at least 500 microns (0.67 mbar), though deeper vacuums (below 200 microns) are preferred for moisture removal.