Navien NPE-32AWE Installation Manual page 20

3. Leave the faucet on until the water heater shuts down due
to a lack of gas supply, and then turn off the hot water
faucet.
4. Remove the front cover by loosening the four Phillips head
screws securing it to the case.
CAUTION
Ensure that no cables are in the way before folding down
the PCB assembly. If the assembly is stuck, do not force
it. Doing so may damage the cables and result in serious
malfunctions. Check again to ensure that no cables or any
other parts are in the way before you proceed.
20 Installing the Water Heater
5. Loosen the screws indicated in the figure below and
connect a manometer to the pressure port. Reset the
manometer to zero before use.
Digital pressure
6. Re-open the manual gas valve and check for leaks.
7. Open multiple fixtures that have high flow rates, such as
bathtub and shower faucets, to ramp the water heater up to
its maximum firing rate.
8. When the water heater reaches its maximum firing rate,
check the inlet gas pressure reading on the manometer.
The gas pressure must fall within the ranges specified on
page 19.
manometer