Lochinvar 1.5, 1.3 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 18) 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 12 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.

•ModBus Time - When the tank temperature reading is provided through the ModBus control, it should be refreshed on a regular basis. This setting defines the maximum time it must be refreshed. If the time expires, the control will revert to its local reading.

•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 18) 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 18) 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 materialsTroubleshooting ServiceMaintenance Armor X2 display Primary Smart Control Module Control inputsControl outputs Secondary Smart Touch Control Module PrimarySequence of operation General OperationHow the water heater operates Sequence of operation Sequence of operationParameter table This table lists the parameters and where to access themBMS Status Screen Viewable and changeable control parametersService Details Screen Service Main Screen Setup Screen Service/Setup Parameters Screen Service Set Point Parameters Screen Night Setback Parameters Screen Cascade Operation Cascade Parameters Screen10Vdc 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 water heater interior Address reported problemsClean condensate trap Inspect water heater areaCheck expansion tank Check water heater relief valve Flue vent system and air pipingCheck water system Check flame signal Check ignition ground wiringCheck all water heater wiring Check control settingsOiled bearing circulators Cleaning water heater heat exchangerCheck Delta T Alarm Screen TroubleshootingCheck control module fuses Before troubleshootingCheck the following Troubleshooting Temperature Resistance Checking temperature sensorsFault Cause Corrective Action Flame out Flow SwitchCondensate Drain BlockedWhile Running Light cont’dFlame Lost High Limit Manual ResetCont’d 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 ObstructionModels 1.3 Gas valve adjustment procedureModel
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