Navien NR-180 Installation Manual

Also see for NP-180: Quick installation guide Service manual Installation manual Operation & installation manual

Navien NR-180 Installation Manual Manual pdf 24 page image

Gas Water Heater Installation24█ Measuring Inlet Gas Pressure:Procedure to measure the inlet gas pressure:1. Shut off the manual gas valve on the supply gas line.2. Open a hot faucet. The unit should turn on and the gas in the gaspipe line should purge. Leave the faucet on to keep the unitrunning until the unit shuts down due to lack of gas supply.Then shut off the hot faucet.3. Remove the screw for the pressure port located on the gasinlet of the Water Heater.4. Connect a manometer to the pressure port and reset it tozero.5. Re-open the manual gas valve. Check to see that there areno gas leaks.6. Open multiple fixtures that have high flow rates (bathtub, showers, kitchen sink) toramp the Water Heater up to its maximum burn.7. When the Navien Water Heater is at maximum burn, check the inlet gas pressurereading on the manometer; it should read between 5.0” and 10.5” WC for Natural gasbetween 8.0” to 13.5” WC for Liquid Propane.8. The maximum inlet gas pressure must not exceed the value specified by themanufacturer and the minimum value listed is for the purposes of input adjustment.GAS PRESSURE TESTINGThe Navien Water Heater cannot operate properly without sufficient inlet gaspressure and volume. Below are instructions on how to check the inlet gaspressure.CAUTIONTHIS IS ONLY TO BE DONE BY A LICENSED PROFESSIONAL.Pressure test port on gas line