RBI FUTERA III Series HeatNet Installation & Operation Manual

Also see for FUTERA III MB-1000: Installation & operation manual

Contents

RBI FUTERA III Series HeatNet Installation & Operation Manual Manual pdf 29 page image

FUTERA III INSTALLATION AND OPERATION INSTRUCTIONS29CONTROL DESCRIPTIONLow Water CutoffIf the boiler is to be installed above radiation or if requiredby other codes or regulations, install a low water cutoff inappropriate piping. Wire the switch to the "Interlock"contacts as illustrated on “Field Wiring” schematic. Ensurethat the low water cutoff device(s) will funtion properly.Operating ControlThe preferred control setting for potable hot water is 130°F,54°C. The operating control should be set to the lowestsetting that will satisfy the consumer's needs.WARNING: Setting the thermostat or operationcontrol too high can result in scalding resulting insevere personal injury!High Limit (Aquastat)The high limit is located in the top control area of the boiler/water heater. A remote capillary bulb is run to a well onthe outlet side of the supply header. The high limit can bereset by depressing the red button.The water heater high limit should be set a minimum of20°F, 11°C higher than the operating control. Refer to theHOT WATER SUPPLY section for the proper supply watertemperature.Flow SwitchA flow switch is provided in the water outlet piping toprevent the boiler/water heater from firing without adequatewater flow through the heat exchanger.DIAGNOSTICSThe Futera III has a display that indicates the sequence ofoperation. The display will also list faults should the unit failto operate. An explanation of each status message and faultcan be located in HeatNet Control Manual under statusscreen fault display section.STATUS SCREEN FAULT DISPLAYThere are numerous interlock switches and softwarelimits that are detected. Each of these, when tripped willproduce a display message, an audible beeping, andan alarm relay closure. The fault is displayed first, thenafter a second, the time the fault occurred is displayed.This cycle will keep occurring until the fault is cleared.These faults are:HIGH LIMIT: When the high limit aquastat trips thefollowing message is displayed:FAULT SYSTEM SET160˚FHIGH LIMITFAULT SYSTEM SET160˚F10/27 9:16The high limit interlock breaks power to the ignitioncontrol (shutting it off) and effectively removes anychance of the gas valve receiving power. The FIII seriescontrol will remain powered to display the fault, latchthe alarm relay/audible beeper, and to access the log.The interlock is located on J5, HIGH LIMIT.INTERLOCK SPARE 3: This is a reserved interlockinput that is normally jumpered at the factory, but canhave a remote interlock connected as a field install. Theinterlock is located on J11A, SPARE 3.FAULT SYSTEM SET160˚FINTERLOCK SPARE 3