Navien NR-180A, Operation & Installation Manual

Page: 28 / 89

INSTALLATION
28
-. 2lb System
1. The minimum and maximum inlet gas pressures are:
Natural Gas Min. 5.0” WC - Max. 10.5” WC
Propane Gas Min. 8.0(9.0 : 180)” WC - Max. 13.5” WC
2. Gas pressures over and above the specified ranges will result in adverse
performance and dangerous operating conditions, any damage resulting from
extreme gas supply pressures will not be covered by the limited warranty.
3. Until pressure testing of the main gas supply line is completed, ensure the gas line to
the Navien Water Heater is disconnected to avoid any damage to the Water Heater.
4. The appliance must be isolated from the gas supply piping system by closing its
individual manual shutoff valve during any pressure testing of the gas supply piping
system at test pressures equal to or less than ½ psi (3.5 kPa);
5. The gas appliance and its gas connections must be leak tested before placing the
appliance in operation. Leaks can be found by using a gas leak detetion device or
by applying soapy water to all gas fittings. Should bubbles occur tighten those
connections and re-test.
6. Always purge the gas line for any debris before connecting to the Water Heater gas
inlet.
7. Never use an open flame to test for gas leaks, as property damage, personal injury,
or death could result.
Gas supply Line Pressures:
Full Size Pipe
Gas Regulator (21b)
1/4"~3/8" Pipe
Gas Regulator
(Supply Press. 12") 1/2" Pipe
Gas Tank