Brazing


Brazing is the process of joining two metals together without the wick effect that solder has.


It consists of two similar metals or dissimilar metals being joined by a brazing rod that melts before the metal being joined will. This will help assist in the bonding process. You can butt the two pieces together and braze them and it will be stronger than a soldered joint. The copper pipes can get red and silver solder will already be melted at this point.


Now a few other terms we must be aware of:


Liquidous temperature is the lowest temperature at which a metal is liquid. Solidus temperature is the highest temperature at which the metal is completely solid.


The temperature at which metal melts is called its melting point.


Brazing uses a higher temperature to melt the rods than soldering. Gas torches such as MAPP gas or oxy acetylene could be used depending on the environment and the size of pipe. MAPP gas works well in non-windy areas for up to ¾ inch pipe. Anything larger than that would push the limits of the heat.


In brazing, the components that make up the rods is determined by the metals you want to join. For the HVACR industry, we typically use silver solder containing different percentages of silver. This will determine the fluidity of the rod on the metal being joined, the cleanliness of the joint for aesthetics, and the strength of the joint.


Flux can come in various forms such as a paste or a coating on the rods. In the example for the HVACR purposes we will use 15% silver solder. An example composition of 15% Silver Solder is: 15% Silver, 80% Copper, 5% Phosphorous. In joining copper to copper, none of these phosphorus/silver/copper rods need flux or would even benefit from it. The phosphorus allows the rod to self-flux on copper. So, if you use the silver solder it has phosphorus in it and does not need flux. It is the flux!


Example: Two pipes cleaned and placed inside a coupling. Heat the pipes until the 15 percent silver solder melts and spreads smoothly along the metal joint between the pipe and the coupling. Then do the other pipe at the joint at the coupling as well. Then stop and allow to cool. Or use a wet rag to cool it down.

Round 2 terminal capacitor

Silver cylindrical electrical capacitor with two terminals on top and a label

Round 3 Terminal Dual Capacitor

Silver BOJACK capacitor with blue label and metal terminals on top

Oval Capacitor

Silver TITAN capacitor with two metal terminals on top and printed label
Silver metal 9V battery with two black and one brass terminals on top

Oval Dual Capacitor

Start Capacitor - Black

Brown cylindrical trash bin filled with crumpled paper and cardboard scraps

Start Capacitor - Brown

Tanner Stinson

Technical Services Manager North Georgia District

April 28, 2022

Using The Navigator Tool

The Comfort Link Navigator is a great option for Comfort link products with faulty or non-responsive controllers. A lot of times the sun will fade the screens and you can’t see the LED readouts. The control buttons will also fail and get stuck so you can’t control anything.


So how do we fix these issues?


That’s where the Navigator comes in. You can do all of the same functions as the Comfort Link controller with a plus. It has a four-line read out screen. You can still force certain points on or off with the same authority as the Comfort link. It is universal so you can plug it into any Comfort Link with confidence.

Setting Up the Navigator


Only plug into the LEN port, do not plug into the CCN because it could damage the hand-held unit.


On every Comfort Link product there are two modular telephone style (RJ14) connector. They are labelled LEN which is Local Access Network. The other is labelled CCN which is Carrier Comfort Network. You will plug into the LEN port of the unit. All the power and data are done through the one LEN jack. No batteries or chargers are needed. It is a self-contained unit. It is also equipped with two large magnets on the back to ensure it stays on the unit while you are using it.


Accessing the LEN Ports


On some units, you can access the LEN port through means other than opening the electrical cabinet. See table below for locations:

Once you have located the plug locations and connected to the LEN port, the Navigator tool will start up.

You can use all the same functions as the Comfort Link controller mounted to the unit. However, with the Navigator tool, you have more than one read out screen, and no longer have to press escape and enter for every screen. Your local Mingledorff’s will be able to help you find one if you decide to purchase one.


Source: All information came from Form 30/48/50-6SI Installation Instructions

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