A.O. Smith 120 trough 500 manual Step Test High Limit Right Terminal

Page 22

BTR TANK TYPE HEATERS

SERVICE HANDBOOK

STEP 3

TEST HIGH LIMIT RIGHT TERMINAL

 

 

 

 

 

 

 

 

STEP 3. TO TEST HIGH LIMIT RIGHT TERMINAL. Ensure that the jumper wire between the high limit and thermostat is connected, and the damper motor power line is connected. Test for 24 VAC between the high limit right terminal and ground.

IF

THEN

The meter does not read 24 VAC:

•

Push the reset button and redo the test (storage

 

 

water temperature below 185 degrees).

The meter reads 24 VAC:

•

Go to step 4.

After Push in Reset - 24 VAC is now present

Reasons For Resetting

Condition

Cause

Solution

High limit open

Never set on initial

Push high limit button

 

installation

 

Excessive water temperature

Faulty thermostat

Replace dual control

 

 

 

Heater shut down before

Faulty high limit

Replace dual control

reaching thermostat setting

 

 

Note: The right terminal of the high limit has a jumper wire connected to the left terminal of the thermostat. There is also a black wire connecting to the damper motor assembly. This black wire supplies power to the motor to close the damper during periods of standby.

A.O. Smith Water Products

21

Service Handbook

Irving, Texas ©2000

Training Department

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Contents Page BTR Tank Type Heaters Service Handbook BTR Handbook Table of ContentsBTR Tank Type Heaters Service Handbook Clearance to Combustibles Table BTR Tank Type Heaters Service Handbook InstallationClearances from Combustibles ModelExterior Clearance AIR for Combustion Cubic Feet of AIR PER 1,000 BTU Excess AIRDirect Communication MAKE-UP AIRSquare Inch Per 4,000 Btuh Vertical Ducts Horizontal Ducts Square Inch Per 2,000 BtuhInsufficient MAKE-UP AIR BackdraftAIR for Combustion Contaminated AIRFlammable Items GAS Pressure Requirements Natural Gas Propane GasBTR GAS Valve Atmospheric Multiple Heaters VentingChimney Single Unit Installation Draft InducerPower Vent Kits for Sidewall Venting BTR Sequence of Operation Sequence of OperationBTR Electrical Sequence 100 109 SeriesBTR Electrical Sequence of Operation Step Test the Transformer Troubleshooting BTR Water HeatersThen Step High LIMIT, Left Terminal Test Reasons For Resetting Condition Cause Solution After Push in Reset 24 VAC is now presentStep Test High Limit Right Terminal Step Inspect the Damper Step Check the PC BoardStep Service SwitchPC Board Motor Test Step Thermostat Test Step Damper Input Test Test from Orange wire to Black neutralTest the Damper Step Test Damper Output Service SwitchAdapter Effikal DamperStep a Harness ChartNormal Operation Test for 24VAC Between Black CommonStep B Normal OperationStep C Test for 24VAC Between Black and Yellow Test Between Black Common and Brown Troubleshooting the Effikal Style DamperStep A1 On the Damper BoardTroubleshooting the Effikal Style Damper Step A3Step Wire Harness Test Step IID Module Test Step Pilot Spark Test Pilot Valve OHM Test BTR 120 400 GAS ValvePilot Valve Test BTR 500 only Pilot GAS Manifold Pressure TAP Blue White REDStep Main Burner Test Step Flame Rectification Flame RectificationPilot is lit Sparking has stopped Main GAS Valve Check Main GAS Valve Coil Check Main GAS Valve Coil Check BTR 500 onlyBTR Wiring Diagram Natural and Propane GAS Honeywell Ignition System 110 109 SeriesGeneral Service Chart General Questions and Answers When should BTRs be delimed?BTR Models 197 SeriesBTR Models 197 Series Parts List for BTR Models 197 and 198 Series 100 Parts Description BTRBTR Models 120 through SeriesBTR Models 120 through Series 193873-1 193873-0 Name Specifications AOS Part Numbers Component Part InformationBTR Service Checklist Proper Sequence of Operation Comments

120 trough 500 specifications

A.O. Smith, a renowned leader in water heating solutions, offers a wide range of products tailored to meet diverse needs. Among its most significant offerings is the A.O. Smith 120 through 500 series, which includes various models designed for both residential and commercial applications.

One of the standout features of the A.O. Smith 120 through 500 series is its efficiency. Many models are designed with advanced thermal insulation and heating technologies, which significantly minimize energy loss. This efficiency not only benefits the environment but also helps users save on energy bills, making these water heaters an economical choice for both homeowners and businesses.

The series includes both gas and electric water heaters, allowing users to select the option that best fits their energy preferences and availability. Gas models typically offer faster heating times and are ideal in areas where natural gas is readily accessible. Conversely, electric models come with a variety of voltage options, accommodating different electrical setups and preferences.

A notable technological advancement in the A.O. Smith 120 through 500 series is the incorporation of smart connectivity options. Some models are equipped with Wi-Fi capabilities, allowing users to monitor and control their water heater remotely via mobile apps. This feature provides real-time data, alerts, and updates, ensuring that users have complete control over their water heating needs.

Moreover, durability is a hallmark of the A.O. Smith brand. The tanks are often constructed from high-quality materials designed to resist corrosion. Many models also feature glass lining and protective coatings, which enhance the lifespan of the heater and minimize the risk of leaks.

Safety is another priority for A.O. Smith. The series is equipped with various safety features such as automatic shut-off mechanisms and temperature controls, ensuring that any potential issues are promptly addressed.

Overall, the A.O. Smith 120 through 500 series encapsulates innovation, efficiency, and reliability. With its versatile offerings and advanced features, it stands as an excellent choice for anyone in need of a dependable water heating solution. Whether for home use or in a commercial setting, these models deliver consistent performance and peace of mind.
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