Display Menu Guide │ Tx I&O Manual6217.0 DISPLAY MENU GUIDEInitial Power-upImmediately following power-up of the boiler, the display reads, “conn”, indicating it is connecting to thecontroller; this is followed by a momentary reading of the display software version, e.g. init 5250. After whichthe controller performs a de-air sequence that is designed to purge air from the boiler water. The de-air sequencecycles the circulators off and on, for a period of 14 minutes, in an attempt to free air pockets that may exists in theheat exchanger and boiler piping.The de-air sequence is initiated following each power-up of the boiler; if air has alreadybeen adequately purged from the system the de-air sequence can be stopped by holdingthe OK button until “dAir” is no longer displayed on the screen, see Figure 17-1.The de-air sequence is designed to remove air from the system; failure to adequatelyremove air from the system can damage the heat exchanger and void the warranty, andmay lead to property damage and personal injury.Figure 17-1 de-Air SequenceMain ScreenFollowing power-up of the boiler (after the de-air sequence), or after 60 seconds of inactivity (no buttonspressed), the boiler defaults to the Main Screen, see Figure 17-2. Under normal operating conditions the MainScreen displays the boiler outlet temperature and water pressure, as well as an indication of the current heatdemand (CH or DHW), burner status and outdoor reset function. See Figure 17-2 for more details.User Menu access – from the Main Screen, access to the User Menu is accomplished simply by pressing the UPor DOWN button on the console; see User Menu section below for more details.Installer Menu access – from the Main Screen or User Menu, access to the Installer Menu is accomplished bypressing and holding the MENU and OK buttons simultaneously; see Installer Menu section below for moredetails.Return to Main Screen – from the User Menu, return to the Main Screen by pressing the OK button. From theInstaller Menu, return to the Main Screen by pressing and holding the RESET button.dAir – indicates theboiler is performingthe de-Air sequence.Temperature unitsBoiler outlettemperatureOk button – press andhold to skip the de-Airsequence.