Navien NHB Series, Installation & Operation Manual

Page: 24 / 135

24 Installing the System Piping
3.1.3 Space Heating System Piping
When connecting the space heating system, follow these guidelines:
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Carefully tighten all connections to avoid damage to fittings.
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After installing the boiler, check the space heating system's operation and inspect for leaks.
Pump Specifications
Model Temp. Rise
Pump Model
Grundfos Taco Bell & Gossett Armstrong
NFB-301C
20°F UPS26-150 2400-60 NRF-36 E8.2
25°F UPS26-150 0013 NRF-36 E7.2
35°F UPS26-99 0010 NRF-36 E7.2
NFB-399C
20°F UPS26-150 2400-60 NRF-45 E11.2
25°F UPS26-150 0013 NRF-45 E8.2
35°F UPS26-99 0010 NRF-36 E7.2
Note
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
the pump outlet. Refer to the performance curve on page 25 to select a pump that suits your application. The dry contacts on
the boiler can supply up to a maximum of 5A current at the boiler pump connection terminal.