Navien NHB H Series Installation And 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
Note
valve or install a check valve at the pump outlet. Refer to the performance curve on page 21 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.
20 Installing the System Piping
Space Heating Return
NHB-055H
NHB-055/080/110H
0015-MSF3-IFC
Space Heating Supply
NHB-080H NHB-110H
GFFM-MSOZUS-001
UPS 15-58
Astro 230CI
Star S 21F
NRF-25
NHB-150H
NHB-150H
UPS 26-99
Astro 280CI
0013-MSF2-IFC
TOP-S 1.25x25
NRF-36