Lochinvar 1.3, 1.5 service manual Cascade Parameters Screen, Cascade Operation

Page 22

Service Manual

1 Service

Cascade Parameters Screen:

Cascade Operation

When multiple water heaters are installed, they can be wired together in a cascade sequence. A maximum of eight (8) heaters can be controlled from a single control. In this application one heater would be designated as the Leader and all others would be designated as Members. The designated Leader water heater determines the total output needed from the group based on the set point and the tank sensor reading. Reference the Wiring of the Cascade section in the Armor X2 Installation and Operation Manual for more information regarding the cascade feature.

The Cascade Screen allows access to four (4) parameters. Those parameters are as follows:

•Cascade Address - The heater designated as the Leader should be programmed with address 0-1. All Member heaters require addresses from 2-3 through 14-15. The address must be different for each member. The addresses can be in any order, regardless of the order in which the water heaters are wired together. This parameter can only be changed by the installer. The default address is 0-1.

•Cascade Off Differential - Sets how many degrees above set point the temperature has to go before the lead water heater will shut off. This parameter can only be changed by the installer. The temperature range of this parameter is 0° to 72°F. The default value is 10°F.

•Cascade Off/On Differential - Sets how many degrees below the turn off temperature (set point + Cascade Off Differential) the temperature has to go before the lead water heater will turn on. This parameter can only be changed by the installer. The temperature range of this parameter is 0° to 72°F. The default value is 20°F.

•Maximum Outlet Temperature - Sets the set point that individual heater will attempt to achieve in a cascade. When a heater is commanded to fire by the Leader, it will attempt to achieve this temperature at its outlet. The Leader will control the modulation of the last heater to fire in order to hold the temperature at the tank sensor to the user set point. If any of the water heater outlet temperatures reach the Maximum Outlet Temperature setting, the water heater will then modulate down on its own in order to keep its outlet temperature within the Maximum Outlet Temperature setting. Therefore, this parameter can be used to limit the outlet temperatures of all the heaters in a cascade.

Reference page 17 for information regarding changing parameters.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in a 24 hour format. Reference the night setback parameters on page 21 for information regarding adjusting the date and time.

Back button - Pressing this button will back the screen up to the previous screen.

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Contents Models 1.0, 1.3, Contents Handling ceramic fiber materials Niosh stated First AidMaintenance ServiceTroubleshooting Armor X2 display Control inputs Primary Smart Control ModuleSecondary Smart Touch Control Module Primary Control outputsHow the water heater operates General OperationSequence of operation Sequence of operation Sequence of operationThis table lists the parameters and where to access them Parameter tableBMS Viewable and changeable control parameters Status ScreenService Details Screen Service Main Screen Setup Screen Service/Setup Parameters Screen Service Set Point Parameters Screen Night Setback Parameters Screen Cascade Parameters Screen Cascade Operation10Vdc BMS Parameters Screen 10Vdc OperationService Cascade Screen Service Temps Screen Burners Screen Graph Select Screen History Screen Service Mode Screen Maintenance Maintenance and annual startup Inspect water heater area Address reported problemsClean condensate trap Inspect water heater interiorCheck water system Flue vent system and air pipingCheck expansion tank Check water heater relief valve Check control settings Check ignition ground wiringCheck all water heater wiring Check flame signalCheck Delta T Cleaning water heater heat exchangerOiled bearing circulators Troubleshooting Alarm ScreenCheck the following Before troubleshootingCheck control module fuses Troubleshooting Checking temperature sensors Temperature ResistanceFault Cause Corrective Action Drain Blocked Flow SwitchCondensate Flame outFlame Lost Light cont’dWhile Running Cont’d Manual ResetHigh Limit Temp SW Automatic ResetHigh Limit / HEX Blower RPM’sSensor Open Louver Proving SwitchToo High Sensor ShortedLow Resets Try LaterAir Flow Too Flap ValveWriting to Internal FaultNo Error Stored MemosOr Obstruction Combustion Analysis ProcedureGas Valve Adjustment Gas Supply PressureModel Gas valve adjustment procedureModels 1.3
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