A.O. Smith 120 trough 500 manual Step Thermostat Test

Page 25

BTR TANK TYPE HEATERS

SERVICE HANDBOOK

STEP 7

THERMOSTAT TEST

 

 

 

 

 

 

 

 

STEP 7. THERMOSTAT TEST. Set the thermostat to call for heat. Using your multimeter, test for 24 VAC between right terminal and ground.

IF

THEN

The meter does not read 24 VAC and the jumper wire

•

Replace the thermostat

between the high limit and the thermostat is in place:

 

 

The meter reads 24 VAC:

•

Go to step 8.

Note: If the high limit to thermostat jumper wire was disconnected earlier to simulate a satisfied thermostat, reconnect the jumper to the terminals.

Note: A yellow wire from this thermostat terminal connects to the damper PC board.

A.O. Smith Water Products

24

Service Handbook

Irving, Texas ©2000

Training Department

Page 24 Page 26
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Page 24 Page 26
Contents Page BTR Handbook Table of Contents BTR Tank Type Heaters Service HandbookBTR Tank Type Heaters Service Handbook Clearances from Combustibles BTR Tank Type Heaters Service Handbook InstallationClearance to Combustibles Table ModelExterior Clearance Excess AIR AIR for Combustion Cubic Feet of AIR PER 1,000 BTUDirect Communication MAKE-UP AIRSquare Inch Per 4,000 Btuh Vertical Ducts Square Inch Per 2,000 Btuh Horizontal DuctsBackdraft Insufficient MAKE-UP AIRAIR for Combustion Contaminated AIRFlammable Items Natural Gas Propane Gas GAS Pressure RequirementsBTR GAS Valve Atmospheric Multiple Heaters VentingChimney Draft Inducer Single Unit InstallationPower Vent Kits for Sidewall Venting Sequence of Operation BTR Sequence of Operation100 109 Series BTR Electrical SequenceBTR 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 Check the PC Board Step Inspect the DamperStep 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 Effikal Damper Service SwitchAdapterNormal Operation Harness ChartStep a Test for 24VAC Between Black CommonStep B Normal OperationStep C Test for 24VAC Between Black and Yellow Step A1 Troubleshooting the Effikal Style DamperTest Between Black Common and Brown On the Damper BoardStep A3 Troubleshooting the Effikal Style DamperStep Wire Harness Test Step IID Module Test Step Pilot Spark Test BTR 120 400 GAS Valve Pilot Valve OHM TestPilot GAS Manifold Pressure TAP Blue White RED Pilot Valve Test BTR 500 onlyStep Main Burner Test Flame Rectification Step Flame RectificationPilot is lit Sparking has stopped Main GAS Valve Check Main GAS Valve Coil Check BTR 500 only Main GAS Valve Coil CheckHoneywell Ignition System 110 109 Series BTR Wiring Diagram Natural and Propane GASGeneral Service Chart When should BTRs be delimed? General Questions and AnswersSeries BTR Models 197BTR Models 197 Series Parts Description BTR Parts List for BTR Models 197 and 198 Series 100Series BTR Models 120 throughBTR Models 120 through Series 193873-1 193873-0 Component Part Information Name Specifications AOS Part NumbersBTR 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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