RBI FUTERA XLF Series Control Manual
Also see for FUTERA III Series: User's information manualInstallation & operation manualInstallation and operating instructionsManual
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Contents
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OPTIONAL FEATURES HeatNet Control V3Page 62the data. If using Modbus, BACnet, or LonWorks, there aresoftware flag bits in registers available.Open and shorted sensors are checked continuously, so thatin the event of a sensor failure, the system shuts down andthe alarm relay is closed.If a pump fails (flow switch required), or the flow switchfails, the boiler will cycle the start condition every 10minutes in an attempt get the boiler restarted.If the damper fails to open and never closes its proof switch,a retry algorithm will attempt a retry. Every 10 minutes thedamper relay will cycle and try to open the damper again.If the H-Net control closes the last interlock string connectedto the ignition control and the ignition control never closes itsBlower Relay, the H-Net control will wait 2 minutes. The H-Net control will then retry for the duration of the local pumppost purge time and then retry the ignition sequence. Duringthis time “retry strt” will be displayed in the status screen.After (5) attempts the H-Net control will lock out and displaycall service.CommunicationsThe H-Net control has the ability to communicate using theMODBUS protocol with a building management system.Most registers and functions are available for MODBUSaccess. Access is allowed using the RS485 MODBUS PORTconnecter on the communication board. Version 2.x Controlhas these connections integrated on the main board.An optional BACNet or LonWorks bridge module can beused to connect the MODBUS network (Default settings) to aBACnet or LonWorks network. See Method 5 control.Failsafe ModesFAILSAFE MODES have been added to help protectsystems from loss of heat conditions. When using one ofthese modes ensure that you connect any DAMPERcontrol, or system pump control to safely allow operationwith the assumption that the MASTER boiler or BMS systemis DOWN.Failsafe Requirements:1. Since the Member boiler that will be assigned theFailsafe duty will always turn the system pump ON, thisboiler should not be used for DHW heating. If theMaster controls the system pump, then the FailsafeMember boiler would need to control the system pumpin parallel with the Master boiler. Wire the System Pumpcontacts in parallel with the Master.2. If the combustion air damper is used as a commonsystem damper, the Failsafe boiler should be wired tocontrol the damper in parallel with the Master boiler.3. The Failsafe boiler must have the LOCAL SETPOINTset to the same setpoint temperature as the Masterboiler’s SYSTEM SETPOINT.Be aware that the boiler may start without a call-for-heat inthe FAILSAFE MODES. FAILSAFE MODES can beaccessed through the:SETUP: AUX FUNCTIONS: FAILSAFE MODES.The following are types of Failsafe conditions.1. Building Management System FailureIf a BMS system is controlling the setpoint and enablingthe boiler system, a timer is provided to allow operationof the system in the event that communications are lostwith the BMS system. The HeatNet boiler system willrun locally if communications is lost and this timerexpires due to the lack of being updated.The system setpoint timer and system setpoint work intandem to externally control (i.e. a BMS - buildingmanagement system) the operating setpoint. Thesetpoint (countdown) timer should be loaded with atimeout value (in seconds) prior to writing the systemsetpoint. When the timer reaches zero, the controlassumes that the BMS is no longer operating and thelocal setpoint (saved on the control) is reloaded. If thesetpoint timer is not written, a default timeout value of60 seconds is assumed. This default time is adjustableand the setpoint timer feature may be disabled in theCOMMUNICATIONS menu. The timer is automaticallyreloaded with the default value when a setpoint iswritten.The BMS mode is always on and no menuitem is available.2. HeatNet Communications LostSETUP: AUX FUNCTIONS: FAILSAFE MODES:H-NET COMM LOST:This mode allows a Member boiler to run in LOCAL ifthe communications link via the H-NET cable is lost.This includes the MASTER boiler losing its Controlboard, Communications board, or the power on theMASTER is switched OFF. When this MODE is set toON, and if the Member boiler loses its link (heartbeatpacket over the H-NET cable) to the MASTER Boiler,this MEMBER will fire to the LOCAL setpoint.The heartbeat packet over the H-NET cableneeds to be lost for 10 minutes. |
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