Gas Piping Connections
Water Piping Connections
Condensate Drain Connection
A condensate drain pipe must be connected to the 1/2 in condensate outlet fitting at
the bottom of the unit and water must be poured into the exhaust connection to fill
the condensate trap.
The end of the 1/2 in (NPT) plastic piping should drain into a laundry tub or into a
floor drain.
Do not submerge the end of the
pipe in water.
Install the included 3/4 in, maximum 30 psi pressure
relief valve on the space heating
An ASME approved HV pressure relief valve for space
heating system is supplied with the boi
You may install the pressure relief valve on the space
heating supply of the Navien Manifold System, or on
the top connection along with the air vent (and an
external LWCO, if required).
Ensure that the Air Vent Cap is removed
before filling the system.
System will not be properly filled without
the air vent cap removed. Air in the
system may
A pressure relief valve must be installed when installing
pipings for a heating system
Before filling the boiler, remove the air vent
cap to allow the system to fill properly.
Replace the cap when the system is full.
The Navien NHB boilers have a top
connection for an air
to purge air from the boiler
installing the air vent, install the air
vent bushing between the air vent and the
top connection.
Do not solder piping directly onto
the water connections, as the heat
may cause damage to internal
components.
Direct to the
external drain
To the laundry tub
via a condensate
The boiler is recommended to be the first
appliance to be connected
The gas meter capacity must be
greater than the to
63.7CFH
* 1 CFH=1,020 Btuh
• 1/2 in rigid pipe can be used; refer to the sizing tables in the Installation
Manual for limitations. Avoid using 1/2" corrugated connectors or tubing as
noise may occur.
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