System Sizing

Proper System Design Load Calculation Equipment Selection Duct Layout Branch runs Terminations Start ups Customer checks

The Next Step Kwik-Way Room By Room Load Calculation Contractor assistance

Load Calculation Essential for a properly performing job Shortcuts are not encouraged BTUs not CFM!!! Loads give you net values Equipment discussed in nominal values

Load Exceptions Sensible vs Latent Don’t add 1/3rd for latent Sunrooms Where does it face? Commercial applications Exceptional heat sources?

Load Calculation ACCA Manual J Industry Standard Currently revision 8 Not for commercial loads Cautions in rooms with large glass areas Use peak function for large glass areas

Kwik Way Runs from Internet and then contractor assistance ation.htm ation.htm Quick program Free Does not keep files, must print out Skip to Equipment Selection

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This was done off internet…. Room by room analysis. Totals load and suggests model and size. Nice presentation tool. Want a CD? Ask you salesmen….

ALTITUDE CORRECTION determine atmospheric pressure at given altitude Step One Altitude Pressure = x( E-06xA) Where: A = altitude in feet

Step Two Correct CFM for Altitude Corrected CFM = xaxb x(c ) Where: a=pressure at altitude, b=specific CFM, c=entering air temperature ALTITUDE CORRECTION

Equipment Selection Check systems capacity chart Match to the load calculation Data on internet Use mix match systems

ARI Listing (edited) Model # SpacePak #MfrSEERMatched capacityAEU AC024X1222AC024X ESP-2430V+TDRLUXAIRE, * * $171* AC024X ESP-2430D+TDRLUXAIRE, * * $171*AC024X1222

System Design Let’s do a house!

My Mother-In-Law’s house

80’s Ranch. On a slab Attic space available Windows are double pane, low “e” Walls are R13 Ceilings are 8’ R19 Heated with boiler and baseboard (cooling only) 70 by 38 ft.

This was done on internet…. Room by room analysis. Totals load and suggests model and size. Nice presentation tool. Want a CD? Ask your salesmen….

Where do I fit the Equipment in ? Look for a central return grill spot Horizontal or Vertical Unit Spacepak in the attic or basement Reaching the other floors w/ 2” “I want the condenser behind the garage” Commercial and multi-zone systems

Where to Place the Return? Central Location – Out of Direct Living Area

Air Handler Location 1. Return Air Duct Dictates Unit Location Best Location for Return Air Grill Split Return Air? 2. Unit Location Dictates Trunk Layout Best Option for Trunk Layout? 3. Outlet Location: Dictates Trunk Run – How Many Outlets, Where do they go?

Air Handler Location ESP-3642

Outlet Location ESP

Restrictors and Balancing: Each 2”run will provide between btu at a run length of 10’-20’ 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 full open for 3642D – 850 CFM to get ESP to 1” and 1.5” W.C.

Outlet Location ESP > <

High Static Plenum Short runs Short runs Long runs Will this pull on fitting?

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!!!!

Suggested Layouts

Plenum Connection ESP > <

Estimating The Job Good measurements can make you money Old homes are gold but full of surprises Refer to Spacepak’s Typical equipment list Two sizes fit all Spacepak is a premium product Selling the extras

Airflow Considerations Spacepak min. required outlets 14, 19, 26 Split or extended return duct Filters New air handler, old system

We Never Undersize Conventional systems undersize for humidity removal Difficult to keep up on 100° days Space Pak’s 6 row coil Humidity control built in Size for the worst day