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5 Things You Should Know When Installing an Air Conditioner
Posted On: June 23, 2022
With the heat of the summer approaching, you may be looking to buy a new Central air conditioner.
Here are some tips to help you get the job done right! Today’s residential air conditioning systems are not as simple to install as they may appear.
Merely connecting all the tubing and wiring is just the beginning.
Beyond that, there are several important steps in the installation that can either make it or break it for you!
Here are 5 very important things that need to be done properly for your new air conditioner to last a long time.
This is how we do it day in and day out.
Number 1 - The installation of the evaporator coil (usually above your furnace) is a crucial part of a good install.
It must be installed in a way that directs all the air flowing out of your furnace, through the new matching evaporator coil.
This ensures that no air is flowing around it.
Also, the air leaks in the sheet metal work should be sealed with tape or sealant made for this purpose.
In the field, we often see an installation where the coil is mounted so that much of the air is flowing around the coil, which was never right to begin with.
We use 26 Gage Galvanized Metal Angle for this purpose because we come prepared to do it right.
Number 2 - The airspeed needs to be set at approximately 350 to 400 CFM per ton for air conditioning to work as it was designed to.
This is a very important step that is needed later when testing the level of “charge in your new system.
" Also, be sure to know the type of restrictor device your system has.
Is it a piston-type or a TXV (THERMOSTATIC EXPANSION VALVE)? It is not unusual, on a service call, to see that an installer has left the furnace fan speed set in the factory position, which is usually too high and a good indication that the charge was never checked when the AC was installed.
There can be a more negative effect on piston-type systems if the airflow is too high or low.
Systems equipped with a TXV also need to have the “bulb” installed in the correct location and orientation.
So many times, when removing someone’s old system we see the bulb still sitting in the shipping location, which means it was never working right from day one.
Number 3 - With today’s systems running on R410a refrigerant, it is more important than ever to have inert gas such as NITROGEN flowing through the copper tubing.
This is used to move the refrigerant from the outside unit (condenser) through the inside unit (evaporator).
The reason for this is that oxides can occur from the brazing process, and they contaminate the new system before it even starts.
This result can result in poor performance and a short life span of your new air conditioner.
Number 4 - It is important to test your new system for leaks before starting it up for the first time.
This is a two-part process that we follow on every installation.
The first step in this process is to pressure test all the welded joints, and since we are using NITROGEN for brazing, we just leave it connected to your new system.
Then, we pressurize the evaporator and new copper line welds up to 200 PSI for a few minutes.
If there is a leak, it will show on the gauge, and you may even be able to hear it if it's big enough.
It's not uncommon to have a small leak at this time because sometimes the position of the joint is difficult to access.
So by using NITROGEN as a first step, the system can be pre-approved as leak-free.
Number 5 - The final step we take, for all new installations or on any repair calls, is to use a Micron gauge to prove that the new system is 100 percent leak-free.
We pull our vacuums down to 250 microns using a properly calibrated digital gauge.
You cannot pull a deep vacuum, such as this, with any kind of small leak or non-condensable in the lines.
Once we establish the deep vacuum, then and only then, do we release the refrigerant from the new AC condenser that comes with a factory charge, which is usually sufficient for installations.
The final part of the start-up process is to measure the charge to ensure it is within the manufacturers' specifications.
We use digital gauges, which measure all the important things needed to be certain the system is right on the money, such as using a superheat calculation for piston-type systems and sub-cooling for systems equipped with a TXV.
We usually end up either having to add a bit of refrigerant to the system or remove a bit of refrigerant depending on the length of the tubing or other variables to dial in the charge just right.
Sometimes it takes an extra bit of time but now you are ready to enjoy many years of trouble-free air conditioning to keep your home comfortable through the hottest days of the season.
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See What Our Customers Are Saying:
Jun 11, 2019
Great team of guys came to do the work. Very professional. Arrived on time worked very efficiently and were very clean. They answered any questions we had without hesitation. The air conditioner works great and is so quiet. I highly recommend them and they don't try to up-sell anything right from the start.
May 10, 2019
The service was prompt, professional and very courteous. Competitive price. Would highly recommend this company.
Jul 20, 2019
Excellent workmanship, and quick response. Would recommend Twintech to anyone.
Nov 11, 2019
My existing 15-yr old A/C went down on me during the first major heatwave of the season. Researched my options, as well as a few different installers, and decided on Twintech.
They gave me confidence right from the beginning. Extremely knowledgeable. Their communication was excellent - always responded to questions quickly. Given we were in a heatwave, they were fully booked. However, within days they were able to fit me in due to a cancellation. Upon learning that the Amana unit I was getting installed was on backorder, TwinTech went to bat for me with the manufacturer and was able to get me the next model up within a day, for the same price - Amazing!
As far as the installation was concerned, I couldnt be more impressed. These guys were clearly very experienced and did a fantastic job. Very clean, polite, timely & informative. They even thoroughly sealed all the exposed gaps in my ductwork. Ive had plenty of heating and cooling work done in the past and have never used the same contractor twice because Ive never been very impressed. However, from now on, Ill always be contacting Twintech first!
Jun 19, 2019
They were very friendly and took care of everything. The install looks great (and works great), they were very knowledgeable. Installed our a/c efficiently despite the difficult install location both inside and outside and they made it work.
Jun 12, 2019
Phenomenal service, so glad I found these guys a few years back after being "hosed" badly by 3 other companies. I've recommended them to so many, and they all are so thankful.
May 1, 2019
This company is fantastic. Dave came out and gave me a very honest and reasonable quote, unlike a quote received from another company. I had a bunch of questions that were easily answered and when I had questions regarding heating/cooling a previously unheated room above the Garage, Dave arranged for Greg to come out for an assessment of this new space and gave me his recommendation along with his professional thoughts on all of my options.
These guys have been nothing but Professional, honest and helpful along the way. I can't recall the two other guys doing the install, but they were great as well. Good workmanship, everything was cleaned up and everything functions as promised. I could go on and on about my experience, but it's all positive so what more could you want?
Give them a call, see for yourself. If I had to buy another furnace/AC or heat pump, they'd be my first call.
Apr 16, 2019
I hired twin tech to convert my townhouse heating from electric to gas and install a furnace and a/c unit. I had talked with many other vendors, and received several quotes, but chose them, and very happy I did. Here are some of the reasons why:
1. They were realistic about the timeline for the work, when they could start and how long it would take. (They said upfront, it was their busy season and would need to get back to me in 3 weeks, which they did):
2. They had a quote with options for me. They were clear about the entertainment of what they would and would not do (theyd build duct work, id need another contractor to box in ductwork). This allowed me to plan as I was my own general contractor for my renovations).
3. They spoke to me in a language I understood, neither too technical nor too simple. They answered all my questions as I had them. Everyone is so lovely to work with, the sales team and the contractors who are worked in my home.
4. Its been 4 m since the work was complete. They still answer my emails and my furnace is working very well!
I unabashedly recommend! Price, customer care and quality workmanship were all amazing!
Apr 12, 2019
On one of the coldest days of winter, our furnace stopped working. Our regular furnace company came and told us we had a CO2 leak and shut us off. Their quote for a new furnace was way too high and they couldn't even install it on the same day. TwinTech was recommended to us by a friend. We called and spoke to Dave who was very nice and knowledgeable. Grant showed up a short time later and a new furnace was installed the same day with no troubles at all. Best of all, we received a higher-end furnace than what was offered by our previous company and at a cheaper price. I would recommend TwinTech with no hesitation at all.
Apr 11, 2019
I installed a new furnace and Air conditioner with them. The installation is of high quality and according to standards. The guys are professional and reasonably priced.. I highly recommend them.
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