Laars NTV1000 Installation And Operation Instructions Manual

Also see for NTH1000: User manual Installation and operation instructions User manual

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Laars NTV1000 Installation And Operation Instructions Manual Manual pdf 103 page image

NeoTherm Boilers and Water Heaters Page 9912.1.2 flap Valve Status CheckEach boiler includes two burners, and each burnerhas a flap valve. See Fig. 124.If one burner in a boiler is operating, and the otheris not, the flap valve for the burner that is off willremain closed to prevent air from moving backwardsthrough the burner that is not operating. Before theLead/Lag Master controller will allow the systemto operate, it must be able to determine whethereach of these flap valves is open or closed. If thecontroller cannot find a signal from one of theflap valves, the control system will act to preventbackflow by energizing the blower of the controlwith the bad flap valve. If this cannot be done thecontrol will not allow the whole system to run. Ifthe flap valve identifications are not set correctly, thecontrol system will present a “HOLD 119 – ControlInteraction Fault” on the display. For this reason, itis important that all of the flap valves be identifiedcorrectly.12.2 about lockouts, Holds, andalertsThe control system on the NeoTherm 1000 respondsto three kinds of trouble indications:• A “lockout” is caused by a serious problemthat might involve a safety issue. Oncethe controller enters a lockout, the burnerswill shut down, and will not be allowed torun again until the cause of the problem iscorrected, and you reset the control system.The controller will also trigger a lockout ifyou change a safety-related parameter, butdo not finish the “verification” process. (Formore information on verification, see thePrimaryburnerPrimarycontrollerFlapvalveFlapvalveSecondarycontrollerSecondaryburnerOperatorinterfaceBoiler 1fig. 124 - flap Valve arrangementsection on “Configuration.”) During a lockoutcondition, the image of the affected controlleron the Home screen will appear in red. Abell symbol will appear in the upper left-handcorner of the control screen. The systemmaintains a “history” of the 15 most recentlockouts.• The system may enter a “hold” for a periodof time before locking out. This allows thecontroller to see if the error becomes resolvedprior to the hard lockout. Holds can occurwhile the boiler is operating.• An “alert” indicates that some feature of thecontrol system’s operation was not correct,delayed or waiting for a response. Thisindicates a change in state of the controlsystem and doesn’t necessarily mean thereis a problem. For example, Alerts occur asthe fan speed transitions from the pre-purgeRPM to the startup RPM. This indicates thatthe control system is waiting for a conditionto be satisfied. No Reset is required torecover from an alert. The system maintainsa “history” of the 15 most recent alerts.Sometimes it can be helpful to check this listas a troubleshooting aid.12.2.1 responding to a lockout, Hold, oralert1. If a problem occurs while the system isstarting up, the system will declare a Hold.A brief explanation of the cause of the Holdwill appear in an orange bar across the bottomof the screen. If you tap the orange bar, thesystem will present more information aboutthe Hold.