Xylem BMAID R4 - Manual (Page 44)

PAGE 44
Residential Water Systems
CentriPro
baSIC formulaS aND SymbolS
formulas
GPM = Lb./Hr.
500 x Sp. Gr.
H = 2.31 x psi
Sp. Gr.
H = 1.134 x In. Hg.
Sp. Gr.
H
V
= V 2 = 0.155 V 2
2g
V = GPM x 0.321 = GPM x 0.409
A (I.D.) 2
BHP = GPM x H x Sp. Gr.
3960 x Eff.
Eff. = GPM x H x Sp. Gr.
3960 x BHP
N
S
= N√GPM
H 3/4
H = V 2
2g
Symbols
GPM = gallons per minute
Lb. = pounds
Hr. = hour
Sp. Gr. = specific gravity
H
= head in feet
psi = pounds per square inch
In. Hg. = inches of mercury
h
v
= velocity head in feet
V = velocity in feet per second
g = 32.16 ft./sec. 2 (acceleration of gravity)
A = area in square inches (πr 2 ) (for a circle or pipe)
ID = inside diameter in inches
BHP = brake horsepower
Eff. = pump efficiency expressed as a decimal
N
S
= specific speed
N = speed in revolutions per minute
D = impeller in inches
CENtrIpro or SquarE "D" SwItChES
Grounding
Provisions
#8-32 screws
Range: adjust
for cut-in point
Differential: adjust
for cut-out point
ADJUSTMENT
Line
L1
Load
Load
Line
L2
LINE LOAD LOAD LINE
MOTOR
L1 L2
MAIN SPRING ADJUSTMENT
Turn clockwise to increase both cut-out
and cut-in pressure. (2 PSI/turn)
DIFFERENTIAL
ADJUSTMENT
Turn clockwise to increase
cut-out pressure without
affecting cut-in. (3 PSI/turn)
furNaS pro CoNtrol
adjust in proper sequence:
1. CUT-IN: Turn nut down for higher cut-in pressure, or
up for lower cut-in.
2. CUT-OUT: Turn nut down for higher cut-out pres-
sure, or up for lower cut-out.