Carrier 42 SERIES - Manual (Page 28)

CV FACTOR vs WATER PRESSURE DROP
CV FACTOR:
The flow rate in gallons per minute (gpm) through a piping component when the pressure drop (
⌬ P) in pounds per
square inch (psi) across the component is 1.0 (psi).
Pressure drop (ft-H
2
O) = 2.31 x psi (pressure drop)
GRAPH EXAMPLE:
⌬
P for 2.0 gpm through a component with a C
V
of 1.0 is 4.0 psi x 2.31 = 9.24 ft-H
2
O
FORMULA EXAMPLE:
⌬
P (ft-H
2
O) =
(gpm) 2
x 2.31 =
(2.0) 2
x 2.31 = 9.24 ft-H
2
O
(C
v
) 2 (1.0) 2
TOTAL PRESSURE DROP is the Sum of the pressure drop of all piping and components in the water flow path.
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