Home > categories > Security & Protection > Fire Alarm > hvac help. which solder/braze and gas to use on refrigerant line?
Question:

hvac help. which solder/braze and gas to use on refrigerant line?

i have universal certification and a leak detector with knowledge of how to do everything. i just lack experience. i've been using mapp gas. i tried to braze the line with bernzomatic ns-3, flux coated nickel silver brazing rod. i heated the joint for about 5-10 minutes and it still would not accept the braze. what type of solder/braze should i use with mapp gas? or do i just need to invest in an oxy-acetylene torch? i have been using nitrogen to purge the system while brazing. the whole project was to replace the evaporator and obviously install new filter drier afterwards. just need to solder/braze everything back together.

Answer:

why are you covering it? You are not going to be able to throw it in a washing machine if it is oil cloth, rubber or coated in acrylic. If you want a plastic mat to put on the floor then get one. You can use a vinyl coated table cloth, they are cheap and easy to find. Some curtain fabric can not be washed, it is dry clean only. What ever you buy make sure it is machine washable first. Woven cotton is your best bet. Denim would work too. You can find it in different colors. Duck cotton is a heavy weight fabric. make sure to pre wash the fabric before you cut it out and sew it.
well, most campuses arent equipped with a way of addressing all students at once. if they had that, it might have worked better. pulling the fire alarm would have been a good idea because it would have gotten the attention of someone, but it would have sent many people out into the possible line of fire, so that one is a really tough call.

Share to: