Guide to Commercial HVAC Systems Basics Before Installing

Gudie to Commercial HVAC Systems Basics Before Installing

HVAC&R systems are cooling and heating systems that give you the ability to keep control of room temperature.

Adjust the air quality to your liking and finally manage the humidity levels in the room with just a simple touch of the thermostat button, providing your home or office environment to become more pleasant and healthy.

Most commercial HVAC&R systems are larger than homes because they need to cover more areas to provide heating and cooling.

Their manufacturing, assembly, and installation are tailored to the client’s specifications and demands by many different suppliers and manufacturers.

How Does A Commercial HVAC System Work?

How Does A Commercial HVAC System Work

The HVAC system works according to the principle of the refrigeration cycle, in which the refrigerant exchanges heat from the air both from inside and outside of the working area.

The heat exchange is done first in the evaporator coils inside, cooling the room, and secondly outside in the condenser dispensing heat to the atmosphere.

The heat convection can also be achieved with the help of either cooled water or hot water/air, depending on if cooling or heating is required.

The HVAC system also provides purification of the air and reduces humidity done with the help of mechanical fans and pumps.

What are the Different Types of Commercial HVAC Systems?

What are the Different Types of Commercial HVAC Systems

The most typical and commonly used commercial HVAC&R system types can be classified as the following types that are based on the refrigerant action and the flow capacity.:

Split HVAC&R System

Miracle Single Split System – Chillers are a great example

Miracle Multi-Split System – Home AC having outdoor units

Miracle VRV (Variable Refrigerant Volume) or VRF (Variable Refrigerant Flow) System

Heat Pump System

Heat Recovery System

CAV (Constant Air Volume) and VAV (Variable Air Volume) Systems

How Do You Size A Commercial HVAC System?

How Do You Size A Commercial HVAC System

When estimating the size of building HVAC system, calculate by following these steps:

Measure the square footage of the room.

Multiply it by 25.

Divide the result of the above two steps by 12,000 (this represents the BTU or British Thermal Units).

And finally, minus the value thus obtained by 0.5.

The value that you now have is the tonnage required for that single room.

Repeat the above steps for other rooms and halls to get a rough estimate of what total tonnage you need.

This Final amount will help you gauge the commercial HVAC system cost.

Communicate with suppliers to know if they provide wholesale rates or not.

How Many Tons in a Commercial AC System?

How Many Tons in a Commercial AC System

Many variables should be considered when deciding the size or capacity of a commercial HVAC unit.

If you are considering installing a modular rooftop unit, it can reach up to 50 tons depending on the rooms in the building.

This modular system requires a large space, and according to its tonnage, the packaged system can take more space while easier to maintain due to its modular nature.

The second important factor is the span of the ventilation ducts;

If you need longer ducts due to a large area, you need to increase the size of your unit or install blower fans at regular intervals for pushing or pulling the cold/hot air.

We recommend consulting an expert when finalizing a commercial HVAC system design.

The final aspect of design and deciding the size of the HVAC system depends on its maintenance modularity.

Even if it is a package HVAC unit, the easier the modulation, the easier to look after.

Even though most companies provide yearlong assistance and supply you necessary tools for small tech works, you should be prepared to hire a spare mechanic and equip him with the best toolkit for optimum efficiency.

Parts of A Commercial AC System

Parts of A Commercial AC System

According to the concept of a refrigeration cycle, the core of any HVAC system is composed of the following:





While these are commercial HVAC system components based on the concept of refrigeration, the following are the individual parts depending on the system you are using.

Some of them are as follows:

Air handling indoor unit

The outdoor unit is also known as a condenser for throwing heat into the atmosphere.

Thermostat, able to control the temperature

Either one of the purifiers or humidifiers

Ducts work

Don’t forget to inquire your supplier to learn more about these concepts and necessary tools and supplies for the best maintenance and high-quality working, some of which are as follows:

HVAC Flaring Tools

HVAC Valves and Gauges



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