First, let’s get straight that BRAZING is when you use a filler rod that isn’t the exact same material as the base metal but that melts ABOVE 840°F. There's been the rare occasion on ref line repair when there was no way I was brazing; carpenter shot 5 16cc nails in our line set. The most commonly utilized process is to use a silver brazing alloy and an air acetylene torch. Excess nitrogen pressure can build up inside the tube and reduce braze alloy penetration.
This long line set application guideline applies to all AHRI listed R-410A air conditioner and heat pump split ... LONG LINE SET APPLICATION R-410A.
Need Some Help . By Robert Scaringe, P.E., Many contractors are experiencing compressor burnout problems with R-410A HVACR systems soon after they’re converted from R-22 refrigerant. Brazing to make an R-410A System Leak-free. This is especially useful following Jan. 1, 2010, when air-conditioning manufacturers will cease production of new equipment that uses R-22 refrigerant. Spacepak . The heating method most commonly used in brazing a single assembly is the hand held torch, therefore most of this guide will focus on manual brazing practices and principles.
For example, at 70°F the R-22 operating pressure is 120 PSIG, while R-410a is 200 PSIG.
With big lines (1 3/8") and above I'll braze with nitro purge, but a residential install is getting soft solder. It was soldered with SB#8. The most common rods used for typical HVAC brazing are 0%, 5% and 15% with several other levels mixed in there. I have an R410A unit and I've read that an inert gas must be used to sweep the lines while brazing due to the r410a's ability to move the oxidation through the system than compared to an R22. The acetylene gas from a compressed gas cylinder flows through a venturi in the torch drawing air into the gas where they are mixed before being consumed in the flame. On the plumbing side, we tend to solder copper tube joints when using a torch. You can use Stay brite 8 solder. I've been on a call where a Lennox XC-13 was way overcharged and tripping the 600 psi high limit on a 95* day and had been doing so for a few days.
When looking for a stronger joint, brazing is one of the options. 2 SECTION 1. In the October 2009 edition of the RSES Journal, The Harris Products Group discussed how to make an R-410A System leak-free.This is especially useful following Jan. 1, 2010, when air-conditioning manufacturers will cease production of new equipment that uses R-22 refrigerant. You might want to just hire the brazing done.