Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

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Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

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Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

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Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

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Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

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Our website displays real-time inventory so you know when to expect your order. Choose from the available products to get your new system right away. We’ll cover rooftop HVAC units from 2 tons to 162 tons, discuss their components, and when to return to the unit or add an exhaust fan.

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Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

If you want to see this demo, scroll down this article to see the Animated version on YouTube.

You’ll find rooftop HVAC units everywhere in small to medium-sized commercial buildings, such as office buildings, restaurants, schools, entertainment centers, retail, grocery stores, condominiums, shopping centers, and more.

Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

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These units are often referred to as RTUs (top-of-the-roof units) and range from very low capacities to over 100 tonnes, with Trane’s Intellipakā„¢ 2 weighing up to 162 tonnes. These large cars are often called “Box Cars” in the US because they are as big as railroad cars.

They provide the same heating and cooling benefits as your home air conditioner, except they’re a little more sophisticated and include some additional features and functions that we’ll cover. Some of these features are required by code because they serve commercial premises.

Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

There are many types of Roof Top Units (RTU) including 100% Outdoor Air Unit (DOAS), Gas/Electric, Heat Pump, Inline Cooling, VAV or constant volume. All components are identical except for the heating and cooling.

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Most of us are familiar with the smaller capacity units of 2-15 tons, but how big is a 150 ton capacity. Here’s a size comparison of the 40-75 ton roof rig and the 2020 Tesla Model S.

Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

As you can see, these packaged rooftop units can be very long. RTU manufacturing will use the same cabinet sizes for different tonnage air conditioners, as the above cabinets will have a capacity of 40 to 75 tons. The difference is in the size of various internal components such as coils, fans, compressors, dampers, filters, etc., but the cabinet is large enough to accommodate this size.

Another consideration is the weight of these units. So here’s a quick look at the weight-based comparison for your reference. Can you guess what’s heavier, a Tesla or a 25 ton roof rig?

Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

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As you can see, these RTUs are very heavy to install on the roof. It’s like parking several cars on your roof. For this reason, the structural engineer needs to check that the structure is designed to support the weight.

A roof unit with only one supply fan is the most common configuration for small capacity units. It can be used in a small space, perhaps a classroom. Barometric dampers can be installed on the ground or inside the RTU to depressurize the building. This closure will allow the excess pressure to escape to the outside. Building pressurization occurs during the economic cycle, which draws all the outside air from the outside and sends it into space without returning. Air has to go somewhere, so it looks for the path of least resistance, like a bend under a door or an open window.

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Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

In large buildings, using only an economizer supply fan will make it difficult to control building pressure. Everyone has been in a building where the door swings open, hisses, or is difficult to open due to the pressure relationship created by the HVAC fans. That’s why it’s important to consider building pressure in larger systems and consider adding a return or exhaust fan to a rooftop unit.

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The best control of building pressure is achieved by adding a return fan. In this configuration, the return fan can handle the static pressure of the return duct and the supply fan can handle the static pressure of the supply duct. There will be three sets of dampers that control the volume (CFM) of the three airflows: outside air, return air, and exhaust.

Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

When in 100% economy mode, all air in the building is replaced by outside air, so the return damper is 100% closed, so the outside air damper is 100% open, and the exhaust damper remains 100% open, sending all air to the outside. building. This is where the use of the energy wheel is important, which we will cover later.

An exhaust fan can be added to larger units. In this configuration, the exhaust fan is used to control building pressure. There will be building pressure monitoring sensors that will let you know when the fan is on. In this case, the supply fan is responsible for the static pressure of the supply and return system.

Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

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Since the supply fan is responsible for the static pressure of the return air, this configuration works best in low static pressure return systems such as ductless returns (attic returns).

An exhaust fan operates to maintain building static pressure by varying damper opening or fan speed, while an economizer (OSA Damper) is configured to meet ventilation requirements.

Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

In many countries, it is necessary to use an economizer to save energy when outside air conditions are cool enough for room ventilation. Economists use outside air to help do all the cooling or to cool the house when it’s cold enough. This allows you to reduce or completely turn off the cooling device (compressor) and save energy. In California, under Title-24 of the Energy Code, an economizer is required for units greater than 54,000 BTUs, or units larger than 4-1/2 tons.

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Fresh Air (Outside Air) quantities are code based and are usually referenced in ASHARE Standard 62.1. The ASHRAE standard provides recommendations for the amount of outside air depending on the type of use of the space. For example, an office requires less outside air than a conference room.

Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

An economizer is basically a set of controls and some control logic that opens and closes outdoor air dampers, allowing more or less outside air into the building based on demand or code minimums.

An important consideration when using an economizer in a commercial building is the building pressure associated with the fan arrangement on the upper floor unit. In low-power units, you can only get rid of the supply fan and barometric bracket, in large units, you need to return or add an exhaust fan.

Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

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Depending on the size of the upstairs unit, code may require variable speed fans. Using a VFD or ECM motor to reduce air volume (CFM) when cooling demand is reduced will save energy. This is usually regulated by energy codes. (See our video on VFDs for a better understanding of how they work).

Fans can be either centrifugal with belt drive or centrifugal with direct drive. The centrifugal fan sits on a spring isolator to dampen motor vibration. In addition to the compressor, the supply fan is another major power user of the rooftop unit.

Ratings Of 10 Ton Commercial Rtu Air Conditioning Systems

In order to provide fresh air to the occupants, outside air vents shall be provided as per regulations. This is usually specified in ASHRAE Standard 62.1 for ventilation requirements. Some codes require that rooftop units rated above 54,000 BTU have an economizer, so exterior vents may have an economizer depending on their size (check your local code). If the unit

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