EK-Pak Owner and Installation Manual
EK-Pak Owner & Installation Manual First Edition December 2002
29
Example, Air Handler Sizing:
One EK-Pak and three 2 Ton air handlers.
Each running at 790 CFM air flow, blower on high speed and against 0.30 inches static air
pressure. The EK-Pak's flow is fixed at 4 gpm and will be divided between all open zones.
The required total heat output from the three air handlers is 120,000 B/Hr. The air handlers
have been derated to 78%, from 53,900 B/Hr at 3 gpm to 42,200 B/Hr at 1.33 gpm per zone.
The First Co rating chart has been used to calculate the actual heat output from the air
handlers, when one, two, and three zones are open and flowing.
One Ek-Pak and two 3 Ton air handlers
.
Each running at 1190 CFM air flow, blower on high speed and against 0.30 inches static air
pressure. The EK-Pak's flow is fixed at 4 gpm and will be divided between all open zones.
The required total heat output from the two air handlers is 120,000 B/Hr. The air handlers
have been derated to 80%, from 80,300 B/Hr at 4 gpm to 64,100 B/Hr at 2 gpm per zone. The
First Co rating chart has been used to calculate the actual heat output from the air handlers,
when one, two, and three zones are open and flowing.
Two zones open, 2 gpm each
124°F exit air temp
Return at 116°F
Supply at 180°F
One zone open, 4 gpm
137°F exit air temp
Return at 140°F
Supply at 180°F
64,100 B/Hr x 2
= 128,200 B/Hr
80,300 B/Hr x 1
= 80,300 B/Hr
EK-Pak
Air Handlers
EK-Pak
Air Handlers
49,200 B/Hr x 2
= 98,400 B/Hr
Return at 152°F
Supply at 180°F
Return at 131°F
56,000 B/Hr x 1
= 56,000 B/Hr
EK-Pak
EK-Pak
Air Handlers
One zone, 4 gpm
141°F exit air temp
Air Handlers
Supply at 180°F
Return at 117°F
Supply at 180°F
42,200 B/Hr x 3
= 126,600 B/Hr
EK-Pak
Air Handlers
Two zones open, 2 gpm each
132°F exit air temp
Three zones open, 1.33 gpm each
123°F exit air temp
