HELIX VX-399 Installation, Operation & Maintanance Manual page 18

5 - HYDRONIC PIPING
5-8C Multiple Boilers Using Primary/Secondary Pumping with DHW Tank
Heating Load Heating Load
2
2
Heating Load
2
CH/System
System
Pump
Temperature
Sensor
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
Up to 16
boilers
18
P/N 240010943, Rev. C [09/07/2016]