Dunkirk Helix VX Vertical Laser Tube Wall Hung Stainless Steel Modulating Condensing Boiler User Manual
Page 87
87
150/200 MBH - PRIMARY LOOP EQUIVALENT LENGTH CALCULATION & PUMP SELECTION
Chart 3
A
B
C
Pipe Diameter
Fitting
Enter Number of
Fittings
Multiply By
Equivalent Length
A x B
1½"
(Any pipe/fitting
larger than 1½",
count as 1½")
90° Elbow
3.8
45° Elbow
2.0
Tee-branch
7.5
Tee-through
2.5
Swing check valve
12.5
Lift check valve
75.0
Enter Total 1½" straight pipe length in feet
Add up numbers in column C
Total equivalent length of Primary
Multiply Total of Column C in Chart 3 by 0.15
Pump Factor
Chart 4
Total Equivalent Length of Primary
Pump options (Minimum)
From
To
Grundfos
Taco
B&G
0
20
UP 26-99
Taco-0013
NRF-36 speed-3
21
35
UP 26-116
Taco 2400-20
PL-36
Note: If the heating system uses antifreeze solution 30% or higher, choose the next larger size pump listed in
this table.