HELIX VX-050 Installation, Operation & Maintenance Manual page 19

5 - HYDRONIC PIPING
FIGURE 5-8B Multiple Boilers Using Primary/Secondary Pumping with Closed External Primary Loop
12"/305mm 12"/305mm Maximum Separation
Maximum
Separation
Existing closely spaced tees
in primary system loop
CH/System System Size common piping
Pump Temperature per maximum heat
Sensor capacity of entire
system
Limit
length to
5' (1.6m)
Up to 16
boilers
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