Navien NFB-175 Mode D'emploi page 21

3.1.3 Space Heating System Piping
When connecting the space heating system, follow these guidelines:
Carefully tighten all connections to avoid damage to fittings.
●
After installing the boiler, check the space heating system's operation and inspect for leaks.
●
The optional Navien manifold system enables easy separation of the boiler (primary loop) from the system (secondary loop(s)). Refer to the
illustration below for an example of the piping connections for a Navien manifold system (primary zone).
Space Heating Supply
The following tables list the specifications for the available pumps and Navien's manifold system. If you are not using one of the pumps listed
below, you must use a circulator with check valve installed at pump outlet or a pump with an integral check valve.
Model Number
Item
NFB-175/200
Manifold System
Pump Specifications
Model Temp. Rise
NFB-175
NFB-200
If you are not using one of the pumps listed in the above tables, use a pump with an integral check valve or install a check valve at
Note
the pump outlet. Refer to the performance curve on page 22 to select a pump that suits your application. The boiler can supply
up to a maximum of 2.5 A current at the boiler pump connection terminal.
NFB-175
Grundfos
20°F UPS26-99FC
25°F UPS26-99FC
35°F UPS15-58FC
20°F UPS26-99FC
25°F UPS26-99FC
35°F UPS15-58FC
Space Heating Return
GXXX001728
Pump Model
Taco Bell & Gossett
0010-IFC
NRF-36
0013-MSF1-IFC
0010-IFC
NRF-25
0015-MSF1-IFC
005-IFC
NRF-22
0015-MSF1-IFC
0010-IFC
NRF-36
0013-MSF1-IFC
007-IFC
NRF-36
0015-MSF1-IFC
005-IFC
NRF-22
0015-MSF1-IFC
NFB-200
Armstrong
E7
E7
Astro 30
E7
E7
Astro 30
Installing the System Piping 21