HELIX VX-050 Installation, Operation & Maintenance Manual page 18

FIGURE 5-8A Multiple Boiler Primary/Secondary Two Pipe Zoned System With Zone Valves - (See Multiple Boiler
Guide)
CH/System
Pump
5 - HYDRONIC PIPING
DHW
Pump
12"/305mm Maximum Separation
Temperature
Up to 16
boilers
(See Multiple Boiler Guide)
18
System
Sensor
Size common piping
per maximum heat
capacity of entire
system
Limit
length to
5' (1.6m)