American Water Heater 316888-004 warranty Temperature Regulation

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Line Voltage Monitor

The control monitors the line voltage provided to the system. If the line voltage is too low, the system components may not operate properly. For diagnostic purposes, the display panel should indicate that the cause was power-related.

•If line power is below 102Vac, the water heater will enter the fault state and initiate a controlled shut-down. The fault will automatically clear if the voltage is restored to 102Vac or above.

•If line power is above 132Vac, the water heater will enter the fault state and initiate a controlled shut-down. The fault will automatically clear if the voltage is restored to 132Vac or below.

TEMPERATURE REGULATION

Temperature regulation is the process by which the controller determines when the water heater is to heat water as well as when to stop the heating process. This section defines how the water heater is to regulate the temperature.

Temperature Units of Measure

The water heater control will display the temperatures in either °C or °F (as per selected unit of measure). The main temperature unit is °C and all the calculations, within the control system, are done using temperature values in °C. The display has the capability to perform a conversion from °C to °F. The resulting temperatures in °F will be rounded off to the nearest degree.

Temperature Set-point

The adjustable temperature set-point is used to determine the desired outlet temperature of the water heater.

The water outlet of the heat engine feeds the outlet of the storage tank although some mixing does occur with the water at the top of the storage tank. For this reason, the temperature of water delivered is considered equivalent to the heat engine output temperature.

This value is to be set within the acceptable range of 90°F (32°C) and 158°F (70°C) when selecting the operating modes.

As a safety measure, the control is to ensure that the set- point cannot be adjusted outside of this range.

If the water flow is turned off and then is turned on, the controller remembers and automatically resets to the last temperature.

If a power outage occurs or the unit is energized/de- energized by the STANDBY symbol for re-booting, the controller resets to the last temperature setting.

After clearing a continuous lockout error code the unit will always go back to the factory default temp setting and mode.

Storage Tank Set-point

The control is required to maintain a storage tank set-point differential temperature.

Storage Tank Call For Heat

The storage tank call for heat is generated when the tank thermistor temperature drops below the storage tank set- point minus the fixed storage tank differential.

At the end of a call for heat the tank thermistor’s temperature is equal to or greater than the storage tank set-point.

Temperature Control Modes

The temperature control functions can operate under one of the pre-defined user-selected control modes. The temperature control mode serves to limit the range of the (heat engine) temperature set-point and the storage tank differential.

Please reference the Operating Mode Selection for details of how the set-point and differentials are adjusted for the different modes. In brief, three modes are provided: Vacation Mode, Energy Saver Mode, and Boost Mode.

The temperature control mode will be maintained after a power loss. Upon restoring power, the temperature set- point is set to the last temperature.

The default setting is 105°F (41°C) in the Energy Saver Mode.

Outlet Temperature Limit Control

Your water heater is designed to provide a constant outlet water temperature. The water heater takes into account dynamic conditions of the heat engine such as the inlet water temperature, flow rate, gas flow adjustment, etc and establishes the optimum performance.

The control will end the call for heat if the outlet thermistor temperature exceeds the set-point by a fixed amount. The call for heat may be restored if the outlet thermistor temperature drops below the set-point by 5.4°F (3°C) or more.

Inlet Temperature Limit Control

To add protection to the system, an over-temperature comparison is made on the inlet water temperature. The water heater will end the call for heat if the inlet thermistor temperature is above the set-point.

The call for heat may be restored if the inlet thermistor temperature drops below the set-point.

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Contents AN Odorant is Added to the GAS Used By this Water Heater Power Vent GAS ModelsTable of Contents Important Definitions Safe INSTALLATION, USE and ServiceGeneral Safety Can be triggered at any time Introduction Preparing for the InstallationPage Operation Replacement Parts and Deliming ProductsGET to Know Your Water Heater GAS Models Rough in Dimensions Installation ConsiderationsDirectly BELOW. Keep Clear of ALL Obstructions Suggested Piping Arrangement For TOP Connections Water Piping Mixing Valve UsageWater Potable Heating All models are considered Hotter Water can ScaldFacts to Consider about Location Handle Installation Earthquake Zones Page Appliances in Confined Spaces Combustion AIR and VentilationAppliances in Unconfined Spaces ALL AIR from Outdoors See Figures 12, 13 Water Piping Chemical Vapor CorrosionClosed Water Systems Thermal ExpansionHard Water TEMPERATURE-PRESSURE Relief ValveValve and Pipe Insulation if supplied GAS Piping GAS Line Purging High Altitude InstallationsFLOODING/FREEZING Filling the Water HeaterPlanning the Vent System If using 2 inch vent pipeVent Pipe Termination If using 3 inch vent pipe Vent Terminal INSTALLATION, Sidewall Installation of Vent SystemCondensate Masonry Side WallsVent terminals supplied with heater must be used Sequence of InstallationsInstallation Sequence Installation of Vertical Vent System Installation of Vent SYSTEM, SidewallSelection of Materials Vent Pipe PreparationInitial Preparation Step B Recommended BRUSH* Size for Primer Cement ApplicationsStep a Step E Power VentStep F Step G Connection to Vent PipeVent Hoods MAY be Extremely HOT During Operation Calibration Electrical ConnectionsFilling the Water Heater Display Panel Operating InstructionsPage MCU Lighting Instructions For Your Safety Read Before LightingHeat Cycle Definitions State Description Temperature Regulation Temperature Probes Unique Hybrid FeaturesPage Temperature Regulation Operational Conditions Constant Output Temperature ControlStart UP Conditions Housekeeping MaintenanceVenting System Inspection Burner Operation and InspectionTEMPERATURE-PRESSURE Relief Valve Operation Anode ROD ReplacementCleaning the Inlet Water Filter MotorsFlushing the Heat Exchanger Lime BUILD- UP Cleaning the Heat EngineDraining the Tank Fault Indication and Error CodesCode Display Example Format Diagnostic DisplayRemarks Fault Lockout Code Description Cause Remedy Type Displayed Fault Lockout Code Description Cause Remedy Type Displayed Fault Lockout Code Description Cause Remedy Type Displayed Troubleshooting There is no HOT Water or When the TAP is OpenedHOT Water Turns Cold Stays ColdLeakage Checkpoints ServiceParts Identification Item # Description AB C DEF KIT # Replacement Parts DescriptionNIP/DIP/TBO/HT Page Page

316888-004 specifications

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