Navien NPE-180A2 Installation Manual page 110

Gasket
<NPE-150S2>
Gasket
<NPE-180A2/S2, 210A2/S2, 240A2/S2>
Figure 5. Exploded view of Gas assembly
DANGER
Fire and Explosion Hazard
To prevent serious injury or death:
ALWAYS inspect the O-ring between the gas
●
valve and gas valve inlet adapter whenever
they are disassembled (see Figure 5).
The O-ring must be in good condition and
●
must be installed. Replace O-ring if needed.
110 Appendixes
Gas Orifice
O-ring
Gas Orifice
O-ring
<NPE-150S2>
GAS : NG GAS : NG (H)
4.50 / 6.30 4.65 / 6.50
<NPE-180A2/S2 Orifice Identification>
GAS : NG GAS : NG (H)
4.80 / 7.50 5.05 / 7.75
<NPE-210A2/S2, 240A2/S2 Orifice Identification>
Figure 6. Orifice identification
7. Remove the Gas Orifice, ensure that the gasket
is properly seated inside the port, and then
install the new Gas Orifice. Ensure that the
Orifice is properly seated on the gasket inside
the port before proceeding to the next step.
Gaskets
Gasket
<NPE-150S2>
8. Replace the gas inlet pipe to its original position
and use all screws to secure all connections.
Do not overtighten as this may
Note
damage or crack the components.
GAS : LP
3.65 / 4.95
GAS : LP
3.90 / 5.65
<NPE-180A2/S2,
210A2/S2, 240A2/S2>