77501 Applications Manual

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Panel Radiator
Applications Manual
Panel Radiator Applications Manual | 11.2019
Technical specifi cations are subject to change without prior notice
Two-Pipe System Options
Figure 12 illustrates two common two-pipe confi gurations.
Fig. 12 Two-pipe System Options
1 2
1 2 1 2
1 2
1 2 1 2
Option 4: Two-Pipe Direct Return System
Option 5: Two-Pipe Reverse Return System
Pressure Bypass Valve
DISCLAIMER: Application drawings in this manual are conceptual only and do not purport to address all design, installation, code, or safety considerations. The diagrams in this manual are for
reference use by code officials, designers and licensed installers. It is expected that installers have adequate knowledge of national and local codes, as well as accepted industry practices, and
are trained on equipment, procedures, and applications involved. Drawings are not to scale.
Refer to the boiler, control and module installer manuals for additional detailed information!
Benefi ts of Two-Pipe Systems:
1. Each radiator is supplied with the same
temperature water maximizing radiator output.
2. No limit to the number of radiators on a two pipe
system loop; the supply and return mains must be sized
for maximum fl ow. Follow the guidelines in Table 10 for
sizing the supply and return runs. Use 1/2” copper or
PEX tubing to connect radiators to main runs.
3. Individual radiator control is easily done using
thermostatic sensor heads. Use constant circulation with
outdoor reset control for optimum system performance. A
central thermostat can be used for on/off control;
however, thermostat location governs overall system
control and may override individual room control.
Requirements for Two-Pipe System:
• Two main distribution pipes are needed; one for
the supply to the radiators and a second pipe for the
return to the boiler.
• A pressure actuated bypass valve (Part No.
3L602502 for a 3/4” Danfoss valve) connected between
supply and return mains is necessary on constant
circulation systems with thermostatically controlled
radiators to prevent dead-heading the pump. This bypass
valve is not needed on thermostat controlled systems if
the radiators are not equipped with thermostatic sensor
heads.