WP_CAR_VRF

WP_CAR_VRF

Variable refrigerant flow (VRF) systems vary the flow of refrigerant to indoor units based on demand.

This ability to control the amount of refrigerant that is provided to fan coil units located throughout a 

building makes the VRF technology ideal for applications with varying loads or where zoning is 

required.  

WP_CAR_CommercialFanApplication

WP_CAR_CommercialFanApplication

The indoor fan is a critical component in every forced-air, space-conditioning system. The fan is

the principal means for delivering conditioned air to a space, and therefore the effectiveness of the fan

has a direct impact on system efficiency, perceived comfort level, and air quality in the space. There are

a variety of fan types and arrangements, each with unique operating properties that lend themselves to

particular applications and design requirements.

WP_CAR_IndoorCoilCorrosion

WP_CAR_IndoorCoilCorrosion

Indoor coil corrosion leading to coil failure is an issue that affects coils manufactured by the entire

HVAC industry today. A leading cause of coil corrosion is formicary acid, an organic acid that

can be formed in the home. Although the occurrence rate of these failures is low nationwide,

some geographic areas have experienced higher incidence rates. For instance, some homes

experience multiple corrosion-related failures while those around them have none. Failures are

typically characterized by leaks that form in the fin pack area of the coil after one to four years of

installation and use.

WP_CAR_FurnaceHeatExchangerSooting

WP_CAR_FurnaceHeatExchangerSooting

Heat exchanger sooting in 90% multi-poise condensing furnaces can begin to form from

several sources. The two most common are improper setup and maintenance, and high

sulfur levels in the fuel. The intent of the following information is to address the operational

changes of the furnace based on high sulfur levels as well as furnace setup and mainte-

nance. The sources of high sulfur will also be addressed.

Keeping Connected

With the rapid pace of technology improvements and equipment changes, it’s important we keep up with the demands of our industry.   We have many electronic resources available to you that will make you a more efficient and informed technician. 

               One of the most important resources from a Carrier/Bryant standpoint is access to HVAC Partners Web Site.  On this site you will have access to all current and past literature for Installation, Service, Wiring, Troubleshooting, Engineering Data, etc.  You just need to log onto www.HVACPartners.com and submit a request for access.  This will normally take 1-2 business days, and you will be notified of a username and password for future access.  

               Additionally, there are lots of FREE Apps for your Smartphone.  Log onto EmersonClimate.com/mobileapp to download a Temperature & Pressure Chart App, Compressor Troubleshooting App (for air conditioning & refrigeration systems) or Check & Charging App just to name a few. 

               You may also just browse the App Stores for your iPhone or Android to find many other useful Apps that will help you every day in the field.

               As always, if you can’t find what you need, I am here to assist you with your Technical questions or problems.  I look forward to speaking with you!

Magnum

Proper Airflow

Every call a Service Technician goes out on should at some level be assessed for proper airflow.  In some cases this means a simple assessment of the duct work, supplys, returns, cleanliness of the coils, and blower wheel.  Other systems may require a more sophisticated approach and an accurate measurement of the delivered CFM.  To kick off the Cooling Season, I thought it would be appropriate and possibly even appreciated to have an Airflow Worksheet that was simple and easy to follow.  Take a look at the attachment and let me know if it’s helpful.  Keep in mind, every manufacturer’s charging method assumes your system is delivering 100% of the design CFM. 

Here is Worksheet if need to print it or view it.
Airflow Measurement Worksheet 

Here’s to a Great Summer!        Magnum

Daikin and DFS Leak's

Many times Duct Free Split systems (Daikin, Mitsubishi, Sanyo, etc) experience refrigerant leaks from the flare fittings.  This has been the "Achilles Heel" of DFS systems for many years.  

There is an easy solution to this problem.  By educating our dealers to use a flaring tool that has an "eccentric burnishing cone" instead of a standard flaring tool, the flare connection should not leak.  This creates a Flare that is far superior and much smoother, to better mate with the brass factory flare.  

Also, there is quite often a tendency to over-torque the flare nuts.  The proper procedure is to use a Torque Wrench and Torque it to the manufacturer's specs.  This number varies based on model/size and liquid/vapor lines.  The best thing to do is check the Installation Manual for specifics.

Using "Leak Lock" on the threads will do nothing to help this flare seal.  The seal is done solely at the flare mating surface.

Just a side note.  When searching a .PDF for key words, use "CTRL" key and "F" to pull up a search window.  Then you can let the computer do the looking for you.  (ie. searching "Torque" in a Daikin Manual). 

Magnum