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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DHW METHODS HeatNet Control V3Page 55Method 5b can also be used in a Hybrid mode onMEMBER boilers with a thermostat connected to the OROVR input. This will enable DHW heating, and be usedinstead of having the 10k sensor’s temperature detectwhen DHW heating is needed, but will use a selectablesensor instead to maintain setpoint.When the OR OVR input sees the thermostat close, the DHWpump/valve will be engaged and remain energized as long asthe OR OVR input sees that the thermostat is closed. TheDHW setpoint along with the DHW heating band will thenbe loaded. A steady temperature will now be maintainedusing the HYB SENSOR setting in the DHW menu. Thissensor will control the water temperature at the sensor’slocation, enabling or disabling the boiler as needed until theOR OVR input sees the thermostat open. Once thethermostat opens, the DHW pump post purge will begin.The difference between the settings of method 5a vs. method5b is the “USE SENSOR” setting. 5a requires that the “USESENSOR” setting be set to YES, and the 5b “USESENSOR” setting be set to NO. The HYBRID SENSORsetting must also be set in the 5b mode to the sensor wheretemperature needs to be maintained. It must be set to OFF inthe 5a method.Method 5a USE SENSOR = YESHYB SENSOR = OFFMethod 5b USE SENSOR = NOHYB SENSOR = SUPPLY, DHW,RETURNEach sensor selection/location has its advantages. Select the:Supply sensor will limit the temperature/firing rate of theboiler, but may not be sufficient for continuous demand orspeed in heating the tank. It is already available, so noadditional sensor is needed.Return sensor will allow the boiler to run its supplytemperature up quickly, but may bounce off of the operatinglimit band. This would heat the tank in the shortest time, butmay overheat the tank. It is already available, so noadditional sensor is needed.DHW sensor will allow the placement anywhere needed tomaintain that locations temperature. This is an additionalsensor that needs to be acquired.A thermostat can be placed in a tank and connected to the OROVR input. (On MEMBER boilers only, The MASTERuses OR OVR already with DHW METHOD 4), When thethermostat contact closes across the input OR OVR (J12A .7& .8) on a MEMBER boiler, the control will sense thisclosure and disconnect itself from HeatNet. It will performthe DHW call, post-purge the pump, and put itself back online available for space heating.DHW METHOD 6: DHW using DirectControl (Not preferred)If the control’s SETTINGS: 4-20 mA input is set toPRIORITY = HIGH the 4-20 mA signal, once brought abovethe 4-20 mA starting current, can be used to override anyother Heat Demand and direct modulate the boiler.This can be set in menu: ADVANCED SETUP: 4-20 mAINPUT. It allows a MEMBER boiler to be taken offline anddirectly modulated by an external control.If the MASTER is using it for heating and the ADVANCEDSETUP: 4-20 mA is set to PRIORITY= HIGH, an externalcontrol can now output a 4-20 mA signal which will takeover the boiler’s fire rate and override all other heatingdemand inputs. The external control would also need to openany valves or turn on pumps. This is typically used for DHWControl.Using the 4-20mA input (OPTIONAL)The 4-20mA input is designed to operate per the ISA-50.1standard. It will support Type 2, Type 3, and Type 4Transmitter/Receiver circuits.With the type 4 configuration, multiple boilers (up to 5), maybe connected in series using the –mA +mA –mA +mAscheme (no jumper to 24VDC RET). This allows one 4-20mA transmitter to control multiple boilers. A free-floating250 ohm resistor is viewed by the BMS (or externalcontrol’s) 4-20mA transmitter across the + and –4-20mAterminals with this method. The 4-20mA (1) input is used tocontrol direct modulation and for remote setpoint control.The Type 2 and Type 3 circuit may use the supplied+24VDC and 24VDC RET connections (J10B) to power aremote transmitter. The –mA terminal will need to have ajumper connected to the adjacent 24VDC RET terminal toreference the signal ground.The 4-20mA (2) input is reserved for flow meters andancillary devices. |
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