Stages of installation of Concealed AC

The stages of the works of Concealed AC built in various stages of construction, through the construction of walls, pouring concrete ceilings, gypsum ceiling works and ending with paints.

In light of the urban development witnessed by our beloved Kingdom, whether for residential, commercial and government projects, it has become necessary to know the appropriate time and stages for installing HVAC systems in general, especially according to our topic, the stages of installing concealed AC.

Starting from the design of the operating diagrams of the concealed AC , which shows the locations of the internal units, the path of the Ducts, the air outlets (Grill), the places of planting copper pipes and the locations of the external units on the plan and then sent to the customer for review and approval for the foundations

After the approval of the AC schemes, the following stages are performed according to the site readiness:

1-the establishment of pipes through which copper passes

The nearest blister is chosen from the indoor unit to plant the pipe with which the copper is extended, and it is taken into account that the extension is inside the walls straight and with the shortest possible length for ease of maintenance or changing the copper later and to give maximum cooling efficiency to the unit

2-establishment of water drainage pipes for indoor units

Pipes are planted inside the walls for water drainage "PVC", the diameters of which are determined according to the catalog of each air conditioning brand to absorb the amount of discharged water, and the work of the “U Trap " wind elbow is taken into account, which works to prevent the return of odors of the drainage network to the internal space of the hidden air conditioning unit

Also, the work of pipes is taken into account to help the water flow smoothly and quickly from the indoor unit to the drain

3-copper pipe extension

Copper pipes are stretched inside plastic pipes according to the diameter indicated in the catalog of each air conditioning brand, taking into account the permissible lengths, which are specified in the catalog as a total value, for example, “50 m”

It is divided into vertical length and horizontal length and in case of exceeding these values for certain reasons, the air conditioning brand Agent is referred to the case study

In some cases, the size of copper pipes is changed to overcome the shortcoming of copper lengths

4-4-the foundation of the control unit “thermostat”

The console hidden air conditioning unit is installed in the wall next to the light switches or according to the owner's request

Each indoor unit of the concealed air conditioning console comes with its own control unit that is connected by wires that are extended within the copper array extended upwards to the external unit

With the development of technology, Central or smart control devices have been developed with which all operating systems are connected to the building (lighting, air conditioning, media, curtains, others”, however, some air conditioning companies have modified and developed their electronic chips in the internal unit and the " PCB "in the external unit to be connected directly to Smart Home “Smart Home" devices

And some air conditioners need to install an additional piece to help the process of connecting the air conditioner and smart home

5-works of air ducts “ Duct” Duct”

The air ducts are designed and their sizes are determined according to several criteria according to the "amount of air flow coming out of the CFM indoor unit", which varies from one air conditioning brand to another and is indicated in the brand catalog with mention of static pressure،

And then, depending on the application, the permissible speed is determined within DKT which is indicated by the codes " SMACNA/ASHRE”

Where residential applications have low speeds, commercial applications are relatively higher, and industrial applications are higher, so these standards are written inside custom programs to determine the required sheet size

6-the work of isolating the Duct

The air ducts of the Concealed AC isolates the console with glass wool insulation “Fiberglass " to maintain the temperature inside the ductwork and not be affected by the external surroundings

The insulation is glued with glue to the sheet and attached to the clamp at specified distances

Also air boxes (Plenum Box) are insulated from the inside with Rubber armflex and from the outside with glass wool

The connection between the indoor unit of the concealed air conditioning console and the air ducts (Machine Connection) is also insulated from the inside with Rubber armflex and from the outside with glass wool

The rapper uses rubber armflex for easy airflow and sound reduction


There are many forms of air outlets and the choice is made according to the requirements of the project, gypsum ceilings and the wishes of the client

They are (side, vertical, square, round, etc.)

As the speed is taken into account inside the air outlets, the speed is also taken into account on the air outlets when determining the required size, and all this, as mentioned, is explained in the codes and catalogs of the air outlets in order to avoid any vibrations affecting the sound levels at the air outlets that lead to noise inside the place

8-Maintenance slots

Indoor units need concealed air conditioning for works Maintenance which includes

(Copper connections, electrical connections, drain pipes, cleaning filters)

Therefore, it requires making a hole in the gypsum ceiling with specific dimensions and a place under the indoor unit as recommended by the air conditioning brand catalog،

Allows access to the indoor unit to carry out the above maintenance work, whether " periodic maintenance, fault maintenance”

9-Dust tests

After the completion of all Sheet work, there are some tests to detect the presence of any leaks in the duct, such as testing the air ducts to detect any air leaks through separators and treating them before insulation to ensure that the full amount of air reaches the place to be adapted.

There are several types of tests such as

(Smoke tests, light tests, pressure tests) and each of them has certain codes and there are specialized companies that are hired to do these tests.

There are also tests that are applied to air outlets and sheet joints “Duct branch " to make air balancing،

It is simply to make sure that the specified amount of air reaches each vacuum without increasing or decreasing

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