State Industries U287-084 Flushing the Heat Exchanger Error Code LC or, Water Heater

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Flushing the Heat Exchanger (Error Code: LC or 00)

An “LC” or “00” error code indicates the unit is beginning to lime up and must be flushed. Failure to flush the appliance will cause damage to the heat exchanger. Damage caused by lime build-up is not covered by the unit’s warranty. After flushing, reset the LC fault code by turning off the power to the unit and turning the power back on.

1.

Disconnect electrical power to the water heater.

2.

Close the shutoff valves on both the hot water and cold

 

water lines (V3 and V4).

3.

Connect pump outlet hose (H1) to the cold water line at

 

service valve V2.

4.

Connect drain hose (H3) to service valve V1.

5.

Pour approximately 4 gallons of virgin, food grade, white

 

vinegar or citric acid into pail.

6.

Place the drain hose (H3) and the hose (H2) to the pump

 

inlet into the cleaning solution.

7.

Open both service valves (V1 and V2) on the hot water and

 

cold water lines.

8.

Operate the pump and allow the cleaning solution to

 

circulate through the water heater for at least 45 minutes.

9.

Turn off the pump.

10.

Rinse the cleaning solution from the water heater as follows:

 

a. Remove the free end of the drain hose (H3) from the pail.

Water Heater

 

b. Close service valve, (V2), and open shutoff valve, (V4).

 

Do not open shutoff valve, (V3).

 

c. Allow water to flow through the water heater for 5 minutes

 

d. Close service valve, (V1), and open shutoff valve, (V3).

11.

Disconnect all hoses.

12.

Remove the in-line filter at the cold water inlet and clean out

 

any residue. Place filter back into unit.

In-line

Filter

V1 V2

Gas Supply

13. Restore electrical power to the water heater.

H3

 

V3

V4

5 gallon pail of virgin, food grade, white vinegar (or virgin,

food grade, citric acid).

 

KEY

3/4" Ball Valve

Pressure Regulator

 

3/4" Union

Circulating Pump

Check Valve

Boiler Drain Valve

Pressure Relief Valve

S Solenoid Valve

Cold Water Line Hot Water Line

H2

H1

Circulating Pump

12

305, 505, 705 Indoor Manual

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Contents Models 305 505 705 ANS Z21.10.3 CSATable of Contents Specifications Model 305 505 705Consumer Safety Information Safety DefinitionsSafety Behavior and Practices Safety Features Features Available on Temperature Controllers FeaturesDescription of Operation Operating InstructionsSetting the Temperature Temperature Options Without a Temperature ControllerTemperature Ranges Setting Controller to MuteModel Temperature Settings Available ºF Re-setting the Maximum TemperatureMaintenance Error Codes Error Code TableCode Fault Remedy Code Trouble Shooting for Common Issues Accessing Operating InformationWater Quality Flushing the Heat Exchanger Error Code LC or Water HeaterInstallation Instructions General InstructionsClearances from Appliance Attachment of the Water HeaterElectrical Connection Gas PipingGeneral Instructions Pipe Sizing Procedure Example Water Piping Pressure Relief ValveFreeze Protection Freeze Protection Piping Water HeaterRecommended Piping for Basic Installation QTYRecommended Piping for Circulation Systems For this applicationOptional Piping for Circulation Systems For this applicationVenting Instructions Intake / Exhaust GuidelinesCondensate Maximum Vent Length Venting Products Listed and Tested Vent Products for the 305 and 505 ModelsListed and Tested Vent Products for the 705 Model Manufacturer Product PartsVent Terminal Area Where Terminal is not Permittted Flue Terminal Clearances ANS Z21.10.3 CSAAdditional Clearances Vent Terminal Inside CornerFlue Installation for the 305 and 505 Models Flue Installation for the 705 Model Air Intake AssemblyExhaust Pipe Assembly Venting Clearances to CombustiblesHorizontal with Concentric Termination Vertical TerminationsHigh Altitude Installations Connecting Multiple Water HeatersNumber of Connected Water Heaters Accessories Necessary GuidelinesTemperature Controller Installation ConfigurationsLocation Cable Lengths and SizeMounting the Controller OutlineofofControllRem terFor Your Safety Read Before Operating Operating InstructionsTechnical Data Pressure Drop CurveOutlet Flow Data Temperature Setting ReplacementSpace Heating PumpsDimensions 505 ModelsLadder Diagram HOTWarranty What is covered?What will be done? How do I get service? What is not covered?Limitation on implied warranties U287-084