HVAC Pump Down 2

I pump down a split system heat pump and release the refrigerant back into the line set when I'm finished.

Category:

Howto & Style

Tags:

• Drz
• pump
• down
• heat

[Skij710]

In your first vid in this series, it looks like you are just putting nitrogen into the system, turning the nitrogen tank off, then removing the hose from the nitro tank and letting it just come out, then closing it off at manifold, and then reopening the service valves in reverse order from pump down order. Is this correct?

[DrZarkloff]

@Skij710 The nitrogen is used to break the vacuum in the line set before opening it up to the atmosphere. When the work is completed on the line set then you have to evacuate the line set with a vacuum pump before releasing the refrigerant back into the line set.

[3882woody]

Thanks for the response I do appreciate. I am have a terrible time finding an evaporator coil replacement for my split system heat pump 2 1/2 ton carrier/bryant the evaporator number is a common one FY4ANF030 do you know of any web sites that will sell the replacement coil to the public. thanks

[DrZarkloff]

@3882woody If the system isn't too old you should be able to get one from a Carrier dealer. The chances are that they won't sell the part directly to you. You'll have to pay a contractor to install it for you.

[3882woody]

Hi why it is that after a pump down you have to put nitrogen in the lineset if the system is going to be opened up for the repair. (I have change the evap coil). also can you recommend a warehouse that sells evaporator coils to the public... thanks i appreciate your help Woody

[DrZarkloff]

@3882woody You don't want to open up a system that's under a vacuum to the outdoor air to prevent moisture in the air from getting in the system.

[Skij710]

First of all, thank you for the great video. I have a question regarding the line set after pumping down. Is there any other method for safely releasing the refrigerant into the line set besides using nitrogen to purge the non-condensables. I know nitrogen is available, but don't need a whole tank of it. I want to move my unit to the side of the house instead of where it currently is by the back porch, which would involve a longer line set. Also can you explain the nitro step better?

[dadanaik]

I have a leaky schrader valve on the suction side. I am unable to replace the schrader under pressure using the special yellow jacket tool due to the valve being in a very tight position. Could I use this pump down method to replace the schrader valve(s)?

[DrZarkloff]

@somerandomdude82 Yes, most definitely.

[DrZarkloff]

@11sprinkles If you have service valves at the air handler, you could pump down a lot of the gas in the evaporator. You'll still have some gas to recover. In the case of compressor replacement, you're better off to recover all of the gas anyway.