Navien NPN Installation & Operation Manual page 34

3.5.1 About the Vent Installation
Detector
The NPN unit comes pre-installed with a Vent
Installation Detector ("VID") to assist the installer in
properly installing the Intake Air/Exhaust Vent Pipe
("Vent Pipe") into the Intake Air/Exhaust vent collar.
How It Works
As shown, the VID is a device connected to the vent
collar which is intended to detect whether the Vent
Pipe has been inserted to a sufficient depth into the
collar during its initial installation.
During installation, the VID detects whether the
vent pipe is fully inserted (at least 1.3 inches or 34
mm) into the collar. If a correctly sized vent pipe (5.0
inch diameter) is fully inserted into the collar, it will
press against a switch to activate the VID. If the vent
pipe is not fully inserted into the collar, the unit will
display an error message and will not operate. Make
sure the vent pipe is correctly sized and has been
inserted properly if Error 762 appears.
Purpose
The VID's purpose is to guide the installer to fully
insert the vent pipe to a depth of at least 1.3 inches
or 34 mm, into the collar. If the vent pipe is not
properly inserted and installed, it could separate
from the collar resulting in flue gas spillage and
carbon monoxide emissions which will result in
severe personal injury or death.
WARNING
The VID is not intended and should not be relied
upon to detect all instances of the vent pipe's
vertical movement or separation from the
collar. Various factors, including but not limited
to sensor failure, switch sticking and corrosion,
may cause the VID to remain activated after the
vent pipe separates from the collar.
Limitations
The VID is not an alarm, safety switch or a substitute
for a carbon monoxide detector. The VID may not
cause the unit to stop operating if the vent pipe
is partially or completely dislodged. Other factors
can impact the performance of the VID causing
it to be unable to function as intended. Such
factors include, but are not limited to, deformity
of the vent pipe, not using a correctly sized vent
pipe, misalignment of the vent pipe into the collar,
vertical movement of the vent pipe caused by
improper installation, and other misuse or non-
conformance with installation instructions.
WARNING
The list above does not represent an
●
exhaustive list of situations that may prevent
proper operation of the VID. It is the installer's
responsibility to install the vent pipe properly
and to adequately secure the unit to the wall.
The VID should not be relied upon as a
●
mechanism to secure or hold the vent pipe
in the collar. The installer must use the
fastening screws provided to secure the vent
pipe to the collar as well as follow all other
installation directions and requirements.
Over tightening of the fastening screws may
puncture the vent pipe.
Installing the Water Heater 33