HELIX VX-399 Installation, Operation & Maintanance Manual page 16

FIGURE 5-8A Multiple Boiler Primary/Secondary Two Pipe Zoned System With Zone Valves - (See Multiple Boiler
Guide)
Size common piping
per maximum heat
capacity of entire
system
1
General
Boiler Pumps
on Return
Side
Limit length
1
to 5' (1.6m)
12"(305mm)
2
Maximum
separation
5 - HYDRONIC PIPING
2
System
Temperature
Sensor
(See Multiple Boiler Guide)
Up to 16
boilers
16
DHW
Pump
CH/System
Pump
P/N 240010943, Rev. C [09/07/2016]