UTICA BOILERS SSC UBSSC-075 Installation Operation & Maintenance page 17

5 - HYDRONIC PIPING
FIGURE 5-7A Single Boiler Using Primary/Secondary Pumping With Closed External Primary Loop
Heating Load Heating Load
12"(305mm) Maximum
separation
Heating Load
12"(305mm)
Maximum
separation
Existing closely spaced tees
in primary system loop
Limit length
CH/System
to
Pump 5' (1.6m)
Heating system
with existing
primary loop.
3/8"/10mm
Open End Wrench
Internal primary
loop ball valves
closed
FIGURE 5-7B Single Boiler Using Primary/Secondary Pumping With Open External Primary Loop
Heating Load Heating Load
12"(305mm) Maximum
separation
Heating Load
Existing closely spaced tees
12"(305mm)
in primary system loop
Maximum
separation
Limit length
CH/System
to
Pump
5' (1.6m)
Internal primary loop
ball valves open.
Heating system
3/8"/10mm
without existing
Open End Wrench
primary loop.
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