HELIX VX-399 Installation, Operation & Maintanance Manual page 13

NOTICE
Illustrations are meant to show system piping
concept only. Installer is responsible for all
equipment and detailing required by authority
having jurisdiction.
NOTICE
Arrange piping to prevent water dripping onto
boiler.
See Table 3 for primary general pump sizing. Primary circuit
pipe components must also be included to size pump.
Table 3 - General Boiler Pump Sizing Chart
∆T
System
20
30
40
50
60
Primary Loop Equivalent Length Calculation & Pump
Selections may be found on pages 79 thru 80 of this
Single Boiler
Multiple Boilers
5 - HYDRONIC PIPING
Flow, GPM Feet Head
38
25
19
15
12
manual.
Table 4 - System Piping Configurations
Primary/Secondary
Two Pipe Zoned System
Primary/Secondary Pumping
Primary/Secondary
Two Pipe Zoned System
Primary/Secondary Pumping
41
18
12
8
5
With Zone Valves
With Zone Pumps
Without DHW Tank
With DHW Tank
With Zone Valves
With Zone Pumps
Without DHW Tank
With DHW Tank
13
Piping Legend
figure 5-5
figure 5-6
figure 5-7A
figure 5-7B
figure 5-8A
Not Shown
figure 5-8B
figure 5-8C
P/N 240010943, Rev. C [09/07/2016]