REMOVING SILICATE

Ammonium bifluoride flakes (NH4FlHF) are used in conjunction with A. O. Smith UN•LIME delimer and pump type deliming kit, part no. 4930, to delime and remove siliceous materials from copper coil water heaters.

The part no. 4920 pump contained in the deliming kit is equipped with a titanium shaft. This shaft will not withstand ammonium bifluoride solutions and must be replaced with a stainless steel shaft, part no. 4926.

Ammonium bifluoride flakes should be purchased locally from chemical suppliers. Contact your dealer, distributor or A. O. Smith Water Products Company for additional information.

CHECKOUT

The checkout sequence should be used as an on-the-job trouble- shooting guide to identify the cause of incorrect system operation and suggest a remedy for its correction.

Because improper piping and wiring can result in unsatisfactory system performance, it is suggested that the installation be

examined before using the checkout procedure. Be sure to refer to the correct piping - wiring diagram and checkout for the type of system that is installed.

The system should be filled with water, purged of air, valves properly set and utilities connected and ready to operate.

CHART 1 - CER-TEMP 80 RECOVERY SYSTEM CHECKOUT PROCEDURE

(Use this checkout for Cer-Temp 80 Recovery Systems)

 

SYSTEM OPERATION

 

 

Checkout Sequence

Contact

Incorrect

Cause

Remedy

Set tank temperature

Circulating pump

Pump and burner

Tank temperature control

Reduce differential.

control 20° (11°C) below

and burner shut

remain on.

differential wide.

 

tank water temperature

off.

 

 

 

 

With thermal

 

Tank temperature control

Replace.

 

balancer, pump off

 

defective.

 

 

delay of approx-

 

System wiring is incorrect.

Correct wiring.

 

imately 2 minutes.

 

 

 

Circulating pump

Pump wired for continuous

Correct wiring.

 

 

on.

operation.

 

 

 

Burner on.

See intermittent pilot system

troubleshooting chart 2.

 

 

 

 

 

 

 

 

Gas valve stuck or defective.

Correct or replace valve.

 

 

 

System wiring in incorrect.

Correct wiring.

 

 

 

 

 

Set tank temperature

Circulating pump

Circulating pump

Automatic gas shutoff

Replace. (If problem

control 20° (11°C) above

and burner on.

on.

control calibrated too low

proven to be at this

tank water temperature.

 

 

or differential too wide.

control by applying

 

 

 

 

jumper to terminals.)

 

 

 

 

 

 

 

 

If system has been in

See preventive

 

 

 

extended use it may

maintenance.

 

 

 

have lime build-up.

 

 

 

 

System wiring is incorrect.

Correct wiring.

 

 

 

 

 

 

 

 

Gas valve or wiring

Check wiring repair or

 

 

 

defective.

replace valve.

 

 

 

See intermittent pilot system trouble-shooting chart 2.

 

 

 

 

 

 

 

Circulating pump

Tank temperature control

Reduce differential. A 5°

 

 

and burner off.

differential too great.

differential is generally

 

 

 

 

used.

 

 

 

Power off or system wiring

Check power supply and

 

 

 

is incorrect.

wiring.

 

 

 

 

 

 

 

 

Tank temperature control

Replace.

 

 

 

defective.

 

 

 

 

See intermittent pilot system trouble-shooting chart 2.

 

 

 

 

 

 

 

Burner on.

System wiring is incorrect.

Replace.

 

 

 

 

 

 

 

 

See intermittent pilot system trouble-shooting chart 2.

 

 

 

 

 

Heater outlet water

Circulating pump

Circulating pump

Automatic gas shutoff

Replace.

temperature exceeds

on.

and burner on.

control defective.

 

210°F.

 

 

 

 

 

 

See intermittent pilot system trouble-shooting chart 2.

 

 

 

 

 

 

 

 

Set tank temperature

System maintains.

 

 

 

control for desired water

desired water

 

 

 

temperature.

temperature.

 

 

 

24

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A.O. Smith 225M, 200M, HW-120M, 160M warranty Checkout, Removing Silicate, System Operation

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.