Navien NHB H Series, Инструкция по установке и эксплуатации

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31 Installing the System Piping
3.5.3 System Application - Zone System with Pumps (Primary/Secondary Piping)
Make-up Water
Backflow Preventer
Pressure Reducing Valve
Additional Zone
Zone #2
Zone #1
Air Separator
Not to exceed 4 pipe Dia or Max. 12"
Boiler Pump
Expansion Tank
Note
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System application drawings are intended to explain the system piping concept only.
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Install a filter in the system return to remove foreign objects from the system. Foreign objects inside
the system may result in abnormal system operation.
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Refer to “3.3 Filling the System” on page 26 for make-up water connections and refer to the
requirements of your local codes to ensure compliance.
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Use a pump with an integral check valve or install a check valve at the pump outlet.
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Refer to “3.6.3 Wiring Diagram - Zone Pump System” on page 35 for wiring connections.