Lochinvar service manual 10Vdc BMS Parameters Screen, 10Vdc Operation

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1 Service (continued)

0 - 10Vdc BMS Parameters Screen:

0-10Vdc Operation

When the Demand Configuration parameter (see page 19) is set to either Cascade BMS Thermostat Based, Cascade BMS Voltage Based, Cascade Modbus BMS Thermostat Based, or Cascade Modbus BMS Voltage Based; a 0 - 10Vdc signal can be supplied to the terminal strip connection or through Modbus communications to control a single unit or a multiple unit cascade.

The BMS Screen allows access to 11 parameters. Those parameters are:

•BMS Type - When the unit or cascade is controlled by the 0-10Vdc BMS input, the voltage signal can control either the modulation rate or set point. This parameter can only be changed by the installer. The default method of control is modulation rate.

•BMS Set Point at Minimum Voltage - Determines the set point used by the unit or cascade when the BMS voltage is at or below the setting of the BMS Voltage Minimum Set Point parameter. This parameter is only active when the BMS Type is set to Set Point. This parameter can only be changed by the installer. The temperature range of this parameter is 32° to 179°F. The default value is 70°F.

•BMS Set Point at Maximum Voltage - Determines the set point used by the unit or cascade when the BMS voltage is at or above the setting of the BMS Voltage Maximum Set Point parameter. This parameter is only active when the BMS Type is set to Set Point. This parameter can only be changed by the installer. The temperature range of this parameter is 70° to 190°F. The default value is 179°F.

Service Manual

•BMS Voltage at Minimum Set Point - Determines the voltage at which the external signal begins to increase the set point. Below this voltage, the set point will be at the setting of the BMS Set Point Minimum Voltage parameter. This parameter is only active when the BMS Type is set to Set Point. This parameter can only be changed by the installer. The range of this parameter is 0 to 10V. The default value is 2V.

•BMS Voltage at Maximum Set Point - Determines the voltage at which the external signal forces the set point to the setting of the BMS Set Point Maximum Voltage parameter. This parameter is only active when the BMS Type is set to Set Point. This parameter can only be changed by the installer. The range of this parameter is 2V to 10V. The default value is 10V.

•BMS Voltage at Start Call for Heat - When the Demand Configuration parameter (see page 19) is set to Cascade BMS Voltage Based, this parameter determines the BMS input voltage at which the unit or cascade is enabled. The unit or cascade will become enabled when the BMS input voltage rises up to or above this value. This parameter can only be changed by the installer. The range of this parameter is 0 to 10V. The default value is 2V.

•Drop in BMS Voltage to End Call for Heat - When the Demand Configuration parameter (see page 19) is set to Cascade BMS Voltage Based, this parameter determines the BMS input voltage at which the unit or cascade is disabled. The unit or cascade will become disabled when the BMS input voltage drops down to or below the BMS voltage at start call for heat minus this value. This parameter can only be changed by the installer. The range of this parameter is 0 to 10V. The default value is 1V.

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Contents Models 1.0, 1.3, Contents Niosh stated First Aid Handling ceramic fiber materialsService MaintenanceTroubleshooting Near boiler piping ServiceSync display Board Control inputsControl outputs Secondary Smart Touch Control Module PrimarySequence of operation General OperationHow the boiler operates How the control module operatesSequence of operation space heating and HW Sequence of operationParameter table This table lists the parameters and where to access themOutdoor Reset Status Screen Viewable and changeable control parametersService Details Screen Service Main Screen Setup Screen Service/Setup Parameters Screen Service Set Point Parameters Screen Outdoor Reset Parameters Screen Service Night Setback Parameters Screen Cascade Operation Cascade Parameters ScreenPumps Parameters Screen 10Vdc Operation 10Vdc BMS Parameters ScreenService Cascade Screen Service Temps Screen Burners Screen Graph Select Screen History Screen Service Mode Screen Maintenance Maintenance and annual startup Inspect boiler interior Address reported problemsClean condensate trap Inspect boiler areaFlue vent system and air piping Check water systemCheck expansion tank Check boiler relief valve Inspect ignition and flame sense electrodes Check ignition ground wiringCheck all boiler wiring Check control settingsCheck flame signal Cleaning boiler heat exchangerReview with owner Test low water flow conditions Test procedureAlarm Screen TroubleshootingBefore troubleshooting Check the followingCheck control module fuses Unit Does No DisplayNo Burner OperationTemperature Resistance Checking temperature sensorsSystem Pump NoisyNo Pump Operation Boiler PumpFlame out Flow SwitchCondensate Drain BlockedLight cont’d Flame LostWhile Running Troubleshooting Blower RPM’s Automatic ResetHigh Limit / HEX Temp SWSensor Shorted Louver Proving SwitchToo High Sensor OpenFlap Valve Resets Try LaterAir Flow Too LowMemos Internal FaultNo Error Stored Writing toGas Supply Pressure Combustion Analysis ProcedureGas Valve Adjustment Or ObstructionGas valve adjustment procedure ModelModels 1.3
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1 specifications

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