Simple installation

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Simple installation
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Current Basic Commercial HVAC Systems
Fan
Fan Speed gt

• VAV SYSTEM FEATURES
• ( One Of Many Types )
• Electric or Pneumatic
• or Digital Controls
• In Duct /or At Diffuser
• Locations
• Pressure, Temperature
• And/Or Flow Sensors
• -------------------------------------------
• VAV The Current State
• Of Technology
• In HVAC !
• Good site to visit see
• animations of various
• VAV systems types!
• How different systems
• work and why !

POSSIBLE MAIN DUCT VAV
VAVs partial open Typically
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HVAC General Rules of Installation Distance from
InDuct to Air Outlets. Do not exceed 20 meters
Its more of an art than a science. Even the
Pros dont always agree !
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GENERAL COMMERCIAL Duct Cell
PLACEMENT.
You Have Two Options ! 1 You can place
ALL duct cell units in the plenum. OR
IF there are reasons that this approach might not
work 2 Then review the duct blueprint and
split the duct system into sections that have
approximately the lt ft2 coverage of the
duct cell you have selected .
Then place a cell at any suitable upstream
insertion point for that section.
REMEMBER Sq Ft coverage ( 8 ceilings) CFM
400 cfm
1000 cfm
500 cfm
600 cfm
500 cfm
500 cfm
6000 cfm
400 cfm
1000 cfm
600 cfm
500 cfm
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EXAMPLE 3
41 x 8 duct
1750 sum cfm
Radius Bends
Inside Walls

• Loading Issues
• A/C only runs at night
• Return air is Via dead space
• Occupancy can spike to 150

2140 sum cfm

• Bahrain- Multi Story Bldg - ½ of floor
• Total of 5,118 sq ft per floor- 3 floors
• 8 ft drop ceilings 10 ft total
• 4 air handlers 2 mains 2 overload
• 1 cell guideline 2000 sq ft - very bad air

Return air registers