Navien CH-180 Installation Manual - Gas Supply Line Pressures:
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GAS PIPING
Gas Supply Line Pressures:
The minimum and maximum inlet gas pressures are:
Natural Gas Min. 3.75" WC - Max. 10.5" WC
Propane Gas Min. 10.5" WC ~ Max. 13.5" WC
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.
Until pressure testing of the main gas supply line is completed, ensure the gas line to the
Navien Combination Water Heater / Heating Boiler is disconnected to avoid any damage
to the Water Heater / Heating Boiler.
The appliance must be isolated from the gas supply piping system by closing its
individual manual shut-off valve during any pressure testing of the gas supply system at
test pressures equal to or less than 0.5 psi (3.5 kPa).
The gas appliance and its gas connections must be leak tested before placing the appli-
ance in operation. Leaks can be found by using a gas leak detection device or by apply-
ing soapy water to all gas fittings. Should bubbles occur tighten those connections and
re-test.
Never use an open flame to test for gas leaks as property damage, personal injury
or death could result.
Always purge the gas line for any debris before connecting to the Water Heater / Heating
Boiler gas inlet.
-. 2lb System
Full Size Pipe
Gas Regulator (21b)
1/4"~3/8" Pipe
Gas Regulator
(Supply Press. 12")
1/2" Pipe
Gas Tank
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