Power to Air Handling Unit

[FaradayFF]

Greetings,
For a typical AHU with integral fan and multi-stage electric heater, do you guys typically supply the unit from one feeder and then branch out locally to the fan and the heater? If both the heater and the fan are specified with local disconnects, then this approach would make sense.
Another alternative is to run separate feeds, one for the fan and one for the electric heater.
Which approach tends to be more common in the industry?

Thanks,
EE

 

[Buck Parrish]

For a typical AHU with integral fan and multi-stage electric heater, Usually one feeder. Depends on the manufacture instructions . Some times they'll provide two breakers as disconnects mounted to the unit. But usually one feeder.

 

[LarryFine]

You need to see the terminals in the unit.

One set of terminals = one feeder.

Two sets = optional: two feeders or one feeder and small panel.

 

[priyankasethi]

The energy needed for any fan is an element of the measure of air to be moved along with the gaseous tension the fan must create. ASHRAE Standard 90.1-2010, Energy Standard for Buildings Except Low-Rise Residential Buildings, gives greatest fan power limitations on HVAC frameworks dependent on the stream rate and an assortment of elements identified with application and filtration level. Future adaptations of Standard 90.1 will fuse a base fan proficiency grade (FEG) as depicted in AMCA 205-2010. Fans in excess of 5 hp will be needed to have a base FEG of 67 and should work inside 10% of their pinnacle productivity. A basic aspect of any fan determination is acoustic execution. It's consistently critical to realize the greatest adequate commotion level on a task. Legitimate choice and determining of fans and AHU packaging can decrease the requirement for silencers and other expensive clamor relief strategies. Since the most ideal approach to decrease fan sound is to diminish the fan power, proficient fans oftentimes have the best acoustic exhibition.

 

[JoeStillman]

...It's consistently critical to realize the greatest adequate commotion level on a task...

Mission accomplished.

 

[augie47]

I cannot express in words how useful I found reply #4 to the question that was asked.

 

[GoldDigger]

I cannot express in words how useful I found reply #4 to the question that was asked.

Like the job reference letter that states: "I cannot recommend him highly enough for this job."

Sent from my Pixel 4a using Tapatalk

 

[LarryFine]

Like the job reference letter that states: "I cannot recommend him highly enough for this job."

"Just remember: you can't put too much water in a nuclear reactor." ~ Told to Homer Simpson