A.O. Smith 160M, 225M, 200M, HW-120M warranty Drain Valve Not Supplied, Safety Flow Switch Settings

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CAUTION: The paddle must be trimmed at the dotted arc. It must not touch the pipe or any restrictions when installed.

FIGURE 5

CAUTION

Any part of the paddle must not touch the pipe or any restrictions in the pipe. Screw the flow switch in position so the flat of the paddle is at right angles to the flow. The arrow on the side case must point in the direction of the flow.

The safety flow switch may be field adjusted to obtain higher minimum flow rates than those shown in Table 5.

To adjust the flow rate setting:

1.Remove the flow switch cover.

2.For higher flow rate—turn the range adjusting screw clockwise.

3.For lower flow rate—turn the range adjusting screw counterclockwise.

CAUTION

The switch is factory set at approximately the minimum flow rate, see Table 5. It must not be set lower than the factory setting as this may result in the switch failing to return at a “no flow” condition.

4. Replace the flow switch cover.

TABLE 5 - SAFETY FLOW SWITCH SETTINGS

 

Minimum Flow Rate (GPM)

Pkg.

 

Contacts Close

Contacts Close

 

Model

GPM

LPM

GPM

LPM

No.

HW-120M,160M

0.6

2.3

0.3

1.1

 

211480

HW-200M

4.2

15.9

2.5

9.5

 

211480

HW-225M

5.8

22.0

3.7

14.0

 

211480

The installer is cautioned to follow the manufacturer’s instructions exactly when inserting this switch into a pipe tee. This is necessary in order to assure positive action of the switch with water flow. Once the minimum flow rate (Table 5) through the heater is reached, the safety flow switch contacts close and consequently, main burner operation is achieved.

DRAIN VALVE (Not Supplied)

A drain valve must be obtained and installed on each heater and tank for draining purposes, see installation diagrams in this manual.

THERMOMETERS (Not Supplied)

Thermometers should be obtained and field installed as shown in the installation diagrams.

Thermometers are installed in the system as a means of detecting a possible liming condition in the heater. An increase of 50F over the normal temperature rise through the heater is an indication that lime is present. The term “temperature rise” designates the difference between the heater inlet and outlet water temperatures.

An increase of 50F (3°C) above the recorded temperature rise may signify a liming condition in the coils or heat exchanger. Refer to PREVENTIVE MAINTENANCE section of this manual for deliming instructions.

Record temperature rise at initial start-up for future reference.

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Contents Commercial GAS Copper Heat Exchanger Water Heater Models HW-120M, 160M, 200M, 225MHeater Performance Data ROUGH-IN-DIMENSIONSGeneral Safety Information Table of ContentsForeword 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 DepositsRemoving Silicate CheckoutSystem Operation 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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