View pricing, availability, product information and place orders online 24/7 at SingleSource®
Technical Services Manager
Southeast District
HVAC evacuation techniques are meant to remove air and moisture trapped in a refrigeration system. Air takes up space in the refrigeration system and causes reduced heat transfer plus erratic operations. On the other hand, moisture in the refrigerant system can freeze-up and block refrigerant flow. Moisture also combines with the oil and refrigerant to form acids and sludge, which can cause system damage or failure.
There are a couple of HVAC evacuation methods that are used. They are the deep vacuum method and the triple vacuum method.
The deep vacuum method relies on evacuation to dehydrate moisture from the refrigeration system. A deep vacuum is any vacuum of 500 microns or less. As the vacuum reduces pressure, the boiling point of water is also reduced. During this time of the deep vacuum the ambient temperature surrounding the system needs to be higher than the boiling point of the moisture in the system. For example, at a vacuum of 5,000 microns, liquid water will boil off anywhere in the refrigerant system where the temperature is 35 degrees or higher.
How do you know the system has been adequately evacuated? First, the system needs to be vacuumed to 500 microns or below, then it is isolated from the vacuum pump. Now the vacuum gauge needs to be monitored to see if there are any changes in the level of vacuum in the system. If the vacuum gauge shows a pressure rise and the pressure continues to rise without leveling off, a leak exists somewhere and needs to be located and repaired.
If the vacuum gauge shows a pressure rise and levels off between1,000 and 2,000 microns within seven minutes, the system is leak free but still too wet. A constant reading on the vacuum gauge of 500 to a 1,000 microns within seven minutes indicates a tight leak free dry system.
The triple evacuation method can take about three hours when performed as recommended. The system is first evacuated to 5,000 microns during the first and second evacuations. Between the evacuations, the system is pressurized with dry nitrogen to about 10 psig and allowed to sit for an hour so the nitrogen can absorb the moisture. For the third and last evacuation, a deep vacuum of 500 microns is preformed and the system is monitored in the same manner described for the deep vacuum method.
The deep vacuum and triple vacuum methods are both used frequently to evacuate and dehydrate refrigeration systems. The deep vacuum method is normally used when new equipment is installed or the refrigeration system was opened for a repair. The triple vacuum method is usually done and recommended, if the system is especially wet or after contaminants are found in the refrigerant system.
These evacuation procedures help protect and can extend the life of a system.
April 2024 Veto Pro Pac Promotion Check out the video and resources below to take advantage of our April Veto bag promotion.
There is no excerpt because this is a protected post.
Black History Month takes place between February 1st and March 1st every year. It’s a time to celebrate and observe the accomplishments,
© 1939–2023 Mingledorff's Inc. All rights reserved.
| Anniston | (256) 241-3026 | 105 E D St, Anniston, AL 36201 |
| Auburn | (334) 734-8011 | 2295 1st Ave, Opelika, AL 36801 |
| Birmingham | (205) 250-7714 | 516 31st St N, Birmingham, AL 35203 |
| Dothan | (334) 836-1035 | 205 Wedgewood Dr, Dothan, AL 36303 |
| Gulf Shores | (251) 968-2660 | 820 Commerce Dr, Gulf Shores, AL 36542 |
| Huntsville | (256) 859-2691 | 391 Nick Fitcheard Rd NW, Huntsville, AL 35806 |
| Loxley | (251) 964-2707 | 30020 Co Rd 49, Loxley, AL 36551 |
| Mobile | (251) 476-2220 | 5522 W Commerce Blvd West, Mobile, AL 36619 |
| Montgomery | (334) 262-4855 | 861 Plantation Way, Montgomery, AL 36117 |
| Muscle Shoals | (256) 383-6904 | 107 Commerce St, Muscle Shoals, AL 35661 |
| Albany | (229) 432-5254 | 205 Baldwin Dr, Albany, GA 31707 |
| Athens | (706) 548-2563 | 105 Whitetail Way, Bogart, GA 30622 |
| Atlanta | (404) 875-7755 | 1290 Tacoma Dr NW, Atlanta, GA 30318 |
| Augusta | (706) 651-1950 | 3618 Wrightsboro Rd, Augusta, GA 30909 |
| Brunswick | (912) 265-5193 | 275 Rose Dr, Brunswick, GA 31520 |
| Columbus | (706) 322-3870 | 6201 W Hamilton Park Rd, Columbus, GA 31909 |
| Conyers | (770) 918-9132 | 335 Gees Mill Business Pkwy NE, Conyers, GA 30013 |
| Forest Park | (404) 361-2474 | 5158-C Kennedy Rd, Forest Park, GA 30297 |
| Gainesville | (770) 297-9335 | 2472 Hilton Dr, Gainesville, GA 30501 |
| Lawrenceville | (678) 442-1060 | 2111 Cedars Rd SE, Lawrenceville, GA 30043 |
| Lithia Springs | (770) 948-3451 | 320 Thornton Rd #106, Lithia Springs, GA 30122 |
| Macon | (478) 474-8544 | 5527 Thomaston Rd, Macon, GA 31220 |
| Marietta | (770) 426-0551 | 1060 Triad Ct, Marietta, GA 30062 |
| Newnan | (770) 239-2105 | 70 Enterprise Ct, Newnan, GA 30265 |
| Peachtree Corners | (770) 239-2100 | 6675 Jones Mill Ct, Peachtree Corners, GA 30092 |
| Savannah | (912) 232-1228 | 103 Central Jct Blvd, Savannah, GA 31405 |
| Statesboro | (912) 764-8841 | 126 W Parrish St, Statesboro, GA 30458 |
| Valdosta | (229) 245-8200 | 363 Connell Rd, Valdosta, GA 31602 |
| Warner Robins | (478) 953-3727 | 110 Byrd Way, Warner Robins, GA 31088 |
| Fort Walton Beach | (850) 244-2017 | 76 Beal Pkwy SW, Fort Walton Beach, FL 32548 |
| Panama City | (850) 913-0585 | 3012 Lisenby Ave, Panama City, FL 32405 |
| Pensacola | (850) 438-1005 | 4405 N. Palafox Street, Pensacola FL 32505 |
| Hattiesburg | (601) 579-9670 | 1851 Lincoln Rd, Hattiesburg, MS 39402 |
| Ocean Springs | (228) 497-5090 | Sunplex Industrial Park, 5717 Suntec Drive, Ocean Springs, MS 39564 |
Norcross – North Georgia Hub
(800) 282-4911
Birmingham – North Alabama Hub
(205) 250-7714
Macon – Southwest Hub
(800) 342-9250
Loxley – Gulf Coast Hub
(800) 239-7419
Savannah – Southeast Hub
(800) 822-7617
| Company | Web Address | Description | |
 | Airzone | www.airzoneinc.com | Custom and Underfloor Air Handlers |
 | Aladdin Metal Products | www.aladdinmetalproducts.com | Curb Adapters and Roof Curbs |
 | Aprilaire | www.aprilaire.com | Indoor Air Quality Products |
 | Autani | www.autani.com | Building Automation and Controls |
 | Bard | www.bardhvac.com | Heat Pumps,Gas/Electric, and Wall Mounted Air Conditioners |
 | Bryant | www.bryant.com | Commercial, Industrial, Residential Heating & A/C Products and Controls |
 | Carrier | www.commercial.carrier.com | Commercial and Residential Heating & A/C Products |
 | Data Aire | www.dataaire.com | Precision Air Control for Data Processing Centers |
| DXair | www.dxair.com | Pool dehumidification systems | |
| First Company | www.firstco.com | Fan Coil Units | |
 | Global Plasma Solutions | www.gpshvac.com | Air Purification and Bi-Polar Ionization |
| Gree | www.greeusa.com | PTACs | |
| Hayes Fluid Controls | www.haysfluidcontrols.com | Hose Kits and Control Valves | |
| iAire | www.myiaire.com | Commercial Air Purification using ionization with energy savings | |
| IslandAire | www.islandaire.com | PTACs, Vertical Units, Water Source Heat Pumps | |
| i-Vu | www.commercial.carrier.com | Building Automation and Controls | |
| Magic Aire | www.magicaire.com | Fan Coil Units | |
| Micro Metl | www.micrometl.com | Roof Curbs, RTU Accessories, & ERVs | |
| Modine | www.modine.com | Gas-Fired Unit Heaters, Duct, Furnaces, Hot Water Cabinet Unit Heaters, Makeup Air, and Dedicated Outdoor Air Systems | |
| Network Thermostat | www.networkthermostat.com | Internet Thermostats, Wifi Themostats, Ethernet Thermostats | |
 | Payne | www.payne.com | Residential Heating & A/C Products |
 | Rawal Devices | www.rawal.com | Continuous Capacity Modulation and Dehumidification for DX Systems |
 | Renew Aire | www.renewaire.com | Fixed-Plate ERVs |
 | Totaline | www.totaline.com | Compressors, Parts, and Supplies |
 | United CoolAir | www.unitedcoolair.com | Modular All-Indoor HVAC Systems |
| Warren Technology | www.warrenhvac.com | Electric Heaters | |
| Wilo Pumps | www.wilo-usa.com | Pump Systems for HVAC and Water Supply and Sewage |
