Navien NHB-055 Installation & Operation Manual page 20

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).
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
Manifold System
Pump Specifications
Manufacturer
Grundfos
Armstrong
Taco
Wilo
Bell & Gossett
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 curves on page 21 to select a pump that suits your application. The boiler can supply
up to a maximum of 2A current at the boiler pump connection terminal.
20 Installing the System Piping
Space Heating Return
NHB-055 NHB-080
NHB-055/080/110
UPS 15-58
Astro 230CI
0015-MSF3-IFC
Star S 16F
NRF-25
Space Heating Supply
NHB-110
GFFM-MSOZUS-001
NHB-150
NHB-150
UPS 26-99
Astro 280CI
0013-F3
N/A
NRF-36