Figure 27: Multiple Boilers, Primary / Secondary - Thermal Solutions ARCTIC Series Installation & Operation Manual

Figure 27: Multiple Boilers, Primary / Secondary Reverse Return Piping
System Pump
Outlet/Supply
Makeup Water
Pressure Reducing Valve
Isolation Valve
Purge Valve
System Pump
Outlet/Supply
Makeup Water
Check Valve
Pressure Reducing Valve
Isolation Valve
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Air Vent
Purge Valve
Air Vent
4D Max
Inlet/Return
Expansion Tank
4D Max
Inlet/Return
Expansion Tank
1500-3000 model shown.
Inlet/Outlet Connections
are similar on the 3500-
6000 models.
Boiler Circulator
Check Valve
Y-Strainer
1. These are suggested piping configurations.
2. Pressure relief valve rating shall not exceed
3. Some piping components cannot be supported
4. Circulation pump must be sized to overcome the
1000 model shown.
Inlet/Outlet Connections
are different on the 1500-
6000 models.
Isolation Valve
Boiler Pump
Check Valve
Y-Strainer
NOTICE NOTICE
It is the installer's responsibility to conform
to local codes and ordinances for additional
requirements.
pressure rating of any component in the system.
by the pipping. Refer to the manufactures'
installation instructions.
pressure drop across the entire loop.
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