Buderus 21 - Option 3: Multiple One-Pipe Systems

Applications manual
| 23
Panel Radiator
Design Manual
Panel Radiator Design Manual | 12.2009 Technical specications are subject to change without prior notice
Option 3: Multiple one-pipe systems.
Options 2 and 3 above can be installed in a multiple loop
fashion where several one-pipe systems are connected
between a common supply and return manifold. Assure
adequate ow in all piping systems when using monoow
loops and/or diverter valve loops. Isolation and balancing
valves are recommended on each loop for service and
ow control.
A properly sized pump operating on constant circulation
can supply water to all loops. A single Grundfos UP15-42
or equivalent can handle up to 3 diverter valve loops; use
a Grundfos UP26-64 or equivalent for 4 to 6 loops. Size
the main piping for the combined ow in all branches,
Drawing not to scale
1 2
1 2 1 2
1 2
1 2 1 2
1 2
1 2 1 2
Option 1: One-Pipe System with Venturi Tees or Monoflow Tees.
Option 2: One-Pipe System with Diverter Valves.
Option 3: Multiple One-Pipe System (Home Run).
Fig. 11 One-Pipe System Options
following the guidelines in Table 10. Refer to the Pressure
Drop Curves (Fig. 14 & 15) on pages 30 & 31 for
estimating the pressure drop through each radiator when
using monoow tees. Use the Pressure Drop Diagram on
page 30 for a one-pipe system with diverter valves. Use
the approximate ow rate through the radiator and ow
setter valve setting to read off the pressure drop. Size the
circulator based on total ow and overall system pressure
drop. Thermostatic heads are required in this
arrangement for individual temperature control.
Ensure all supply and return piping is sized properly to
avoid restriction and noise.