Laars NTH1000 Installation And Operation Instructions Manual

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

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Laars NTH1000 Installation And Operation Instructions Manual Manual pdf 72 page image

LAARS Heating SystemsPage 68About the “Time of Day” FunctionIf the “time of day” function is enabled, the controlsystem can be set to maintain different temperaturesfor central heat and domestic hot water (other thanthe normal setpoints) in the system at certain timesof the day. Normally this function is used to switchto lower temperatures at night, when the centralheating or domestic hot water demand is reduced.When the controller acting as the Lead/Lag Masterreceives a time of day input, the controller shiftsto the special setpoints entered for central heat anddomestic hot water.The input for the Time of Day function must bewired to pins 2 and 3 on connector J10.Fig. 90 – Connections for “Time of Day” FunctionJob J - Install the System Sensor andAdjust the Setpoint(This is a Lead/Lag function – do this once for the whole Lead/Lag system. Make the connections to the controller set up as theLead/Lag Master – usually the Primary controller on Boiler 1.)1. Install the System sensor at the location shownin Fig. 91. Connect the System sensor to theSystem terminals on the controller acting asthe Lead/Lag Master (usually the Primarycontroller on Boiler 1.) Use terminals 3 and 4on TB6.2. Adjust the Lead/Lag Central Heat Setpointto the desired temperature to be used by thesystem.How to get there – Adjust CH SetpointHome Page Lead LagScreen Lead LagScreen Lead Lag MasterConfiguration ScreenLine 2 = CH SetpointFig. 91 – Mounting Location for System SensorJob K - Set the Lead Lag Outdoor Reset andWarm Weather Shutdown(This is a Lead/Lag function – do this once for the whole Lead/Lag system. Use the controller set up as the Lead/Lag Master –usually the Primary controller on Boiler 1.)For more information on the outdoor reset function,see the explanation which follows.1. Install the outdoor air temperature sensor andmake the connections to the outdoor air sensorterminals on the controller acting as the Lead/Lag Master (usually the Primary controller onBoiler 1.) Use terminals 1 and 2 on TB7.Table 16 – Base Load SettingsNumberof boilersInstalledBase load min.1 65%2 50%3 30%4 30%Pins 2 and 3 onconnector J10