Navien NCB-24LSWE Installation & Operation Manual

Also see for NCB-24LSWE: Service manual

Navien NCB-24LSWE Installation & Operation Manual Manual pdf 25 page image

26 Installing the System Piping3.5 Pressure Relief ValveThe requirements recommended for the pressure relief valve areas follows:● The pressure relief valve is calibrated to be activated at amaximum pressure of 3 bar, and all the pipes and connectionsmust therefore be able to withstand pressures of up to 3 bar.● Connect the pressure relief valve drain to a tube with adiameter of at least Ø15 mm. It must tilt downwards indownstream direction throughout its entire length, and thewater must run off to a suitable drain. It must be positionedso as not to cause damage to cabling, electrical equipment orpersons.● The drain must not be located above a window, entry door orany other public access point. Bear in mind that boiling wateror steam could come out when draining.3.6 Filling the systemBefore filling the boiler pipes, pull up the air vent cap to allowthe pipes to fill properly. Press the cap back in when the pipesare full.Air Vent CapNote Ensure that the vent cap is fitted before testing oroperating the system.3.7 Testing the Water SystemWARNINGEnsure that the boiler is full of water before firing the burner.Operating the unit without filling it will damage the boiler.Such damage is not covered by the warranty, and may resultin property damage, severe personal injury, or death.Perform a fill test after installing the boiler’s water system tomake sure that the system has been installed properly. Followthe instructions below to perform a fill test on the water system.1. Close the manual air vents and the boiler drain valve.2. Fill the boiler. The correct pressure will vary with eachapplication.3. If the pressure is lower than the minimum pressure set (1 barby default), error code E02 will appear on the display.4. Fill the boiler with more water until the error messagedisappears.5. At initial fill and during boiler start-up and testing, checkthe system thoroughly for leaks. Repair any leaks beforeproceeding further.WARNINGEliminate all system leaks. The continual introduction of freshmakeup water will reduce boiler life. Minerals can build up inthe heat exchanger, reducing heat transfer, overheating theheat exchanger and causing heat exchanger failure.CAUTIONBefore operating the boiler for the first time, ensure that theboiler system is filled with water. Purge the air inside thesystem to avoid damage to the boiler.