Dunkirk DKVLT-050 Installation, Operation & Maintenance Manual page 19

FIGURE 5-8B Multiple Boilers Using Primary/Secondary Pumping with Closed External Primary Loop
CH/System
Pump
5 - HYDRONIC PIPING
Heating Load
12"/305mm Maximum Separation
12"/305mm
Maximum
Separation
Temperature
Up to 16
boilers
Heating Load
Existing closely spaced tees
in primary system loop
System
Sensor
19
Heating Load
Size common piping
per maximum heat
capacity of entire
system
Limit
length to
5' (1.6m)
All internal
primary loop
ball valves
closed
3/8"/10mm Open
End Wrench may
be required to
turn valve