Navien NCB700-2S Plus 42K Installation & Operation Manual page 29

4.3.2 Using the NaviCirc With a Boiler Without a Recirculation Pump
The following diagram shows an example of an installation location of the NaviCirc used with a boiler without a recirculation pump. The
components in the dotted lines of the diagram must be installed to operate the NaviCirc.
Recirculation
Pump
Hot Water
Supply
Check Valve
Cold Water Supply
Refer to the following before installing the NaviCirc.
Note
To prevent backflow of water from the hot water return pipe, install a check valve on the cold water supply.
●
An expansion vessel must be installed and it can be moved depending on the installation environments. Install an expansion
●
vessel on the cold water supply pipe near the hot water return pipe.
If the hot water return pipe is installed above the boiler, install an air vent at the top of the hot water return pipe.
●
To install the pressure relief valve provided with the NaviCirc, refer to the pressure relief valve's installation manual and install
●
it properly on the cold water supply pipe.
To control the operation time for the recirculation pump, install timer or aquastat.
●
Pressure Relief Valve
Expansion
Vessel
Hot Water Return
Air Vent
NaviCirc
Installing the System Piping 29