Post on 26-Dec-2015
How to get it where
you need it!
How to get it where
you need it!
System InstallationSystem InstallationSystem InstallationSystem Installation
copyright Mestek, Inc. 2006
• Restrictors and Balancing:
• Each 2”run will provide between 1700 - 2000 btu at a run lengths of 10’ – 30’
• 3 restrictor sizes
• 15%, 30% and 50%
• Living room = 3 full runs
• Family room = 5 full runs
• How about the Dining room?
• Needs two outlets but gain is only 2800 btu.
• Use 2 30% restrictors on both runs. = 2800 btu
• Runs must total 19-21 full open for 3642D – 850 CFM to get ESP to 1.2” and 1.5” W.C.
High Static PlenumHigh Static Plenum
ShortrunsShortruns Long runsLong runs
Will this pull
on fittin
g?
Considerations:Considerations:•Want to keep runs as close as possible to 10
feet in length. full 40 cfm and 2000 btu per outlet makes it much easier to balance…..
•Generally less $$$ to run supply plenum extra distance than run long 2” runs.
•Want to “premake” the 2” runs downstairs where it’s nice and cool!!!!
Support Takeoff RunsSupport Takeoff Runs
•20 degree down angle minimizes stress
Round Duct
Round Duct
2” Air Supply Run2” Air
Supply Run
Min. Run LengthMin. Run Length•Air supply runs should be a min. of 6’ prior to sound attenuating tubing.
Minimum RadiusMinimum Radius
•Minimum 4” radius
•New 90° elbow
•Fits tight corners
•Runs down 2x4 wall
Tubing Takeoff RunsTubing Takeoff Runs•Supply connections should be a minimum 24” from the fan coil, and 18” from plenum tees, elbows and a minimum of 8” from other supply runs
Minimum 18”
Minimum 18”
18”
8”
Minimum 24”
Tubing Takeoff RunsTubing Takeoff Runs
•Main Trunk/Plenum – Maximize use of the main trunk line in order to minimize the lengths of 2” duct. It will allow for an easier installation and better performing, balanced system if the 2” duct lines are minimized.
2” Supply 2” Supply TubingTubing
• 3-ply aluminum• Flexible but strong• With insulation and vapor
barrier• R-8, 50’ lengths• R-6, 75’ lengths
• R-4.3, 100’ lengths
• Reduces waste
• Speeds installation