Advantages To Swapping Air Conditioning Systems
Folks frequently need to find out whether they can change their existing channeled
evaporative system over to a new channeled reverse cycle air con system by utilizing all the same ductwork and outlets. The easy answer's no. Below is a list of reasons as to why you can't simply change the system over to become a reverse cycle ( HVAC ) system.
First off reverse cycle grilles ( or outlets ) are often placed near windows and away from the doors. This permits the air to condition the heat / cold that comes in without delay thru the windows. The airflow for a reverse cycle system should also take the longest route back from the outlet to the return air grille. If an outlet was placed next to a door, the air would simply be sucked back beneath the door towards the return air grille and the room would have hot spots close to the window.
The issue with evaporative grilles is they are typically found by the entrances. The evaporative units airflow should take the longest possible trail thru a room and out of the window. If they were found right next to a window, the air would simply flow out the window and hot spots would be caused close to the entrances and in the distant side of rooms.
Thanks to these reasons it isn't suggested to put reverse cycle grilles in a same spot where a channeled evaporative grille was formerly found. Though it's actually possible to do it'll seriously reduce the efficacy and capacity of the system. The most suitable choice is to start fresh and put the new reverse cycle grilles in the proper desired location as required. Nevertheless this would imply you'd need to patch and paint the holes in the ceiling left by the removal of the old evaporative grilles and this is a pricey job.
Another choice is generally to add additional grilles as required. You can consider leaving grilles close to the entrances from the evaporative system and add additional grilles by the windows if necessary.
Another problem encountered when swapping the systems over is that the old ducting cannot be used. The ducting used for evaporative units is far larger than that required for reverse cycle ducted air conditioners. Evaporative units use ducting around the 16-20 inch mark. This large size duct is used by evaporative air conditioners as the air is extremely fast blowing and it aims to draw in air to the amount of 40 times the cubic area of your house per hour. Reverse cycle ducting is mostly only around the 12 inch mark in diameter. This is because reverse cycle air conditioning is far slower moving than it's evaporative counterpart.
Evaporative channeling is also often only barely if at all insulated. Reverse cycle channeling ought to be insulated by at least two inches to save the cooling / heating and to stop condensation from happening.
So if you want to swap your current evaporative system over to a new reverse cycle ducted system, you are best to start from scratch. Be sure to get quite a few quotes for the cost to patch and paint the ceiling before starting any work. And if air conditioning contractors tell you they can simply swap a system over using the existing duct and outlets, ask lots of questions and be wary as they may not be around to help you out once you have paid good money and your system is not working effectively.
In a number of cases using the present grilles can be a choice, it would make the system less effective.
by: Charles Kesler.
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