RBI Futera Fusion XLF Installation And Operation Instructions Manual

Also see for Futera Fusion XLF: Installation and operation instructions

Contents

RBI Futera Fusion XLF Installation And Operation Instructions Manual Manual pdf 32 page image

32Finned copper tube gas boilers – Boiler ManualCOMBUST AIR DAMPER: If the combustion air damper hasbeen selected for use (MASTER BOILER, AUX FUNCTIONS),and the proof switch does not make, this fault will be displayed.When the combustion air damper is used, the master’s BOILER3/DAMPER relay contacts at J13 are closed. These should be wiredto the combustion air damper or preferably an isolation relay.The prove switch on the combustion air damper must be wiredto J10B, SPARE 1.FAULT SYSTEM SET160˚FCOMBUSTION AIR DAMPERWhen the master boiler receives a call for heat and needs tostart a boiler, the BOILER3/DAMPER relay K5 closes. At thesame time, the boiler is started, fires, and continues to fire. Ifthe combustion air damper does not prove within the prooftime specified in the combustion air damper menu, the boilerwill shut down and display the fault. The fault on the Masterboiler can be cleared by removing the call for heat on themaster boiler and fixing the combustion air damper problem.A combustion damper fault on a Member boiler can only becleared by power cycling.The Master boiler controls a system damper and Member boilerscontrol their own respective dampers. When the call for heat isremoved, the damper will remain open for 30 seconds before closing.This allows for post purge cycles to complete.OPEN ***** SENSOR: If the open sensor fault is displayed, thesensor in the position reported was originally detected, but hassince opened. The boiler will shut down on any OPEN sensor.FAULT SYSTEM SET160˚FOPEN OUTSIDE SENSORSHORTED ***** SENSOR: If the shorted sensor fault is displayed,the sensor in the position reported was originally detected, buthas since shorted. The boiler will shut down on any SHORTEDsensor.FAULT SYSTEM SET160˚FSHORTED OUTSIDE SENSORDELTA TEMP > 40°F: If the temperature across the heat exchangerrises above the maximum designated temperature for the FuteraFusion model boiler, a warning or fault will be displayed. Thisprotection is required to prevent damage to the heat exchanger inthe event high differential temperatures are encountered. The faultor warning condition may be changed in the AUX FUNCTIONSmenu under ALARM TYPE. The default condition is WARNINGwith LIM->HALF RATE = YES.When this condition exists and the ALARM TYPE is set toWARNING and LIM-> HALF RATE, the boiler is limited to 1/2it’s input rate. So, if the boiler is trying to fire at 80%, the rate islimited to 40% until the temperature across the heat exchangerfalls at least 10°F below the maximum designated temperaturefor the Futera Fusion boiler model. In this case: 40°F - 10°F = 30°F.If the ALARM TYPE is set to FAULT, the boiler will displaythe FAULT message and this condition will be treated as aninterlock, thus shutting down the boiler until the Delta Tempdrops 10°F below the maximum designated temperature.1/2 INPUTDELTA TEMP > 40°FLOCAL SET41˚FRETURN TEMP < 130°F: If the Return Inlet temperature isless than 130°F this warning will be displayed. This warningdoes not affect operation and does not set the alarm relay. Alog entry is made to aide in diagnosing why this may beoccurring. Condensing will occur with return temperaturesbelow 130°F and a shortened heat exchanger life will occur.PREPURGERETURN TEMP < 130°FLOCAL SET41˚F