Evacuation Process

Pulling a correct vacuum is important to the operation and longevity of any refrigeration or cooling system.  Moisture and different contaminants that aren’t eliminated can wreak havoc on system internals over time and might trigger untimely failures.  Lets undergo the steps of pulling a correct vacuum.  

1.    Begin with recent oil in your pump, vacuum pump oil has the power to seize maintain of moisture and contaminants. New oil will velocity up the evacuation course of.  When altering vacuum pump oil, it’s endorsed that you just change the oil whereas its heat, heat oil holds extra contaminants than chilly oil. Altering the oil whereas its heat will assist take away most contaminants from the bottom of the pump.  

2.     Connect vacuum rated Schrader core elimination instruments to the service fittings that might be utilized through the vacuum course of and take away the Schrader cores.  By eradicating the cores, you might be eradicating 90% of the restriction that slows down the evacuation course of.  Consider, some producers use service fittings with non detachable cores, pay shut consideration to this.  

3.    It is suggested to not pull a vacuum by means of a charging manifold resulting from many potential leak factors.  Use a vacuum manifold, such because the Yellow  Jacket SuperEvac, and fasten it to the three/8” port on the vacuum pump.  

4.    Connect, at minimal 3/8” vacuum rated hoses to every core elimination device, connect the opposite finish of every hose to the vacuum manifold.  Use Nylog, thread and gasket sealant at every connection level, it will assist to take care of a leak free course of.

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5.    Connect a micron gauge to the system on the furthest level from the vacuum pump, if attainable.  The opposite choice, is to connect the micron gauge to the tee of the core elimination device.  You will need to preserve the micron gauge mounted above the system piping, it will forestall system oil from getting into the micron gauge and probably inflicting the gauge to malfunction. 

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6.    Now you possibly can start the evacuation course of.  Please learn the producer’s vacuum pump begin up process earlier than beginning the pump.  

7.    The evacuation course of just isn’t depending on time or when your compound gauge hits 29.92” Hg.  Use the studying on the micron gauge to find out when a correct vacuum has been achieved.  It’s common throughout the trade to set a vacuum goal of 500 microns.  

8.    As soon as the goal vacuum has been achieved, isolate the system from the pump and observe the micron gauge studying.  A standard time period for this process known as a “decay take a look at”.  If the system is leak and contaminant free you might even see a slight rise on the micron gauge which can degree off and flatten out or you might even see no rise in any respect.  If a system leak exists or contaminants are nonetheless current, you will note a fast rise on the micron gauge that may proceed to climb.  Be aware: It is extremely vital to make use of vacuum rated hoses and core elimination instruments and be sure that every connection level is sealed with Nylog thread and gasket sealant.  If the gear used just isn’t vacuum rated, connection factors in your vacuum arrange might start to leak through the decay take a look at, mimicking a system leak that’s not truly current.  

9.    Now that you’ve achieved vacuum Zen, the refrigerant cost have to be added.  Add refrigerant slowly till the system strain is studying a slight optimistic.  It is extremely vital to know the optimistic strain your micron gauge is ready to face up to so it doesn’t get broken throughout this course of. As soon as optimistic strain, beneath the higher restrict of the micron gauge, has been achieved, the Schrader cores might be re-installed and the micron gauge might be eliminated. 

10.    Add the remaining cost.

11.    Blissful HVACing!

Be aware: When pulling a vacuum on a system with a solenoid valve, it’s extremely really useful that the valve is totally open always through the evacuation course of.  Use the Yellow Jacket Solenoid Valve Magnet to carry out this activity.  

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Take a look at the hyperlink to my YouTube channel for extra ideas, tips, and troubleshooting movies and take a look at the The HVAC Know It All podcast right here or in your favorite podcast app.  Blissful HVACing…