User Guide
Applications manual
| 23
Panel Radiator
Design Manual
Panel Radiator Design Manual | 12.2009 Technical specications 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 monoow
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
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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 monoow 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.