A.O. Smith 160M, 225M, 200M warranty Deliming Solvents, Removing Light Deposits, Heavy Lime Deposits

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The usage of water softening equipment greatly reduces the hardness of the water. However, this equipment does not always remove all of the hardness (lime). For this reason it is recommended that a regular schedule for deliming be maintained.

The time between cleaning will vary from weeks to months depending upon water conditions and usage. A change of approximately 50F in the normal temperature rise through the heater is usually an indication that scale should be removed. For long life, copper or brass is recommended for all valves, pipe and fittings used between gate valves “A” and “B” and the heater, see fig. 18.

Heater failure due to excessive lime build-up voids the warranty

.

FIGURE 17

DELIMING SOLVENTS

A. O. Smith recommends the use of UN•LIME® for deliming. UN•LIME is a patented food grade acid which is safe to handle and does not create the harmful fumes which are associated with other products.

UN•LIME may be obtained from your dealer, distributor or the A. O. Smith Water Products Company. Order part no. 4763 (1 gal.), packed 4 gallons per case, or part no. 4813 (5 gal. container).

CAUTION

Observe handling instructions on label of product being used.

REMOVING LIGHT DEPOSITS

1.Shut off electric and gas supply to the burner.

2.Close gate valves “A” and “B”.

3.Install drain hose assembly in upper deliming tee. Open drain cock and drain heater. Install standpipe in lower deliming tee or in tee from which pressure relief valve has been removed.

4.Close drain valve.

5.Slowly pour 3 gallons of UN•LIME into heater through standpipe. Direct solution into suitable container with a hose, see fig. 18.

DELIMING THE HW WATER HEATER

FIGURE 18

6.Continue to fill until foaming action stops.

7.When foaming action has stopped completely, allow 10 to 15 minutes for UN•LIME to dissolve any remaining scale in the heater.

8.Open the drain valve and drain all UN•LIME from the heater.

9.Remove standpipe and drain hose assembly from tees. Install fittings originally removed into openings. Open valve “A”, allowing fresh water to flow through heater and out drain valve for 3 to 5 minutes.

10.Close drain valve and open valve “B”. Heater is now ready for operation.

HEAVY LIME DEPOSITS

If the solvent does not readily pass through the clogged coils or heat exchanger, it will be necessary to use a deliming pump or contact a service agency for proper cleaning.

A. O. Smith part no. 4930 motorized deliming pump kit, complete with pump, hoses, fittings, container and instructions, is available from your dealer, distributor or A. O. Smith Water Products Company.

A. O. Smith Form No. 4778, entitled “All About Deliming Coil Type Water Heaters”, describes heater cleaning methods and equipment required. UN•LIME and the booklet may be obtained through your dealer, distributor or A. O. Smith Water Products Company.

FIGURE 19

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Contents Commercial GAS Copper Heat Exchanger Water Heater Models HW-120M, 160M, 200M, 225MHeater Performance Data ROUGH-IN-DIMENSIONSForeword Table of ContentsGeneral Safety Information Liquid Petroleum Models High Altitude InstallationsGrounding Instructions Chemical Vapor CorrosionIntermittent Ignition Control Module FeaturesAutomatic GAS Shutoff Control Thermal BalancerIntermittent Ignition Control Module I.I.D Tank Temperature ControlSafety Flow Switch Circulating PumpDrain Valve Not Supplied Safety Flow Switch SettingsInstallation Instructions Confined Space Proper Vent Pipe InstallationVenting Relief ValveWater Potable Heating Hard WaterClosed Water System Water Line ConnectionsPiping Diagrams Page Page GAS Supply Pipe Sizes in Inches GAS ConnectionsCorrect GAS Sizing GAS Supply LineElectrical Information Page Purging of GAS Line OperationGeneral FillingOperating Instructions for I.I.D. Models For Your Safety Read Before OperatingOver 170F 77C Checking and Adjusting the InputMain Burner for HW Heaters Service InformationPilot and Main Burner Maintenance D. Pilot BurnerInspecting the Heat Exchanger Venting System Protector SwitchProtector Switch Continuity Test Thermal Balancer Schematic DiagramGAS Pressure Regulator Preventive MaintenanceElectrical Service Replacement PartsDeliming the HW Water Heater Deliming SolventsRemoving Light Deposits Heavy Lime DepositsSystem Operation CheckoutRemoving Silicate YES No Spark AT Pilot BurnerReplace pilot burner Replace ignition Module Spark AT Pilot Burner but Pilot will not LightMV & MV/PV? Pilot Burner Lights but Main Burner does not LightLimitations on Implied Warranties Service and Repair ExpensesClaim Procedure Conditions and Exceptions

HW-120M, 225M, 200M, 160M specifications

A.O. Smith is renowned for its range of advanced water heaters, and the 160M, 200M, 225M, and HW-120M models stand out as some of the most reliable and innovative options available. These water heaters are designed to deliver exceptional performance, energy efficiency, and user-friendly features, making them ideal for various residential and commercial applications.

The A.O. Smith 160M model boasts a robust design that ensures longevity and efficiency. It has a 160-gallon capacity, providing ample hot water for households with high demand. This model incorporates insulation technology that minimizes heat loss, contributing to energy savings and reduced utility bills. Additionally, it features a durable exterior that is resistant to rust and corrosion.

The 200M model takes performance a step further with a higher capacity of 200 gallons, making it suitable for larger homes or businesses. This model is equipped with advanced components, including a high-efficiency burner and a powerful thermocouple that ensures reliable heating. The 200M also includes user-friendly controls that allow for precise temperature settings and easy operation.

Next in line is the A.O. Smith 225M, which offers an impressive 225-gallon capacity. This model is designed for heavy-duty usage and features a reinforced tank to withstand high pressure. The 225M is also equipped with state-of-the-art flame retention technology that optimizes fuel use, enhancing the overall efficiency of the unit. This ensures that customers not only get hot water when needed but also experience considerable savings on energy costs.

Finally, the HW-120M model is a compact solution that does not compromise on performance. With a capacity of 120 gallons, it is ideal for smaller households or spaces where water heating needs are moderate. The HW-120M includes features such as an LED display for easy temperature monitoring and an integrated safety system that prevents overheating.

All these models utilize advanced technologies such as electronic ignition and enhanced insulation materials, contributing to a reduction in energy consumption and maintenance needs. The combination of these features makes A.O. Smith appliances a smart choice for consumers looking for efficiency, reliability, and performance. With a strong commitment to craftsmanship and innovation, A.O. Smith continues to set the standard in water heater technology, ensuring customers enjoy reliable hot water access while promoting energy efficiency.
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