A.O. Smith 120 trough 500 manual BTR GAS Valve

Page 13

BTR TANK TYPE HEATERS

SERVICE HANDBOOK

BTR GAS VALVE

The gas valves used on all BTR water heaters are 24 volt AC combination step opening gas valves. They incorporate the pilot valve, main valve, and gas pressure regulators into one body. The inlet view of the valve features a filter screen and the top knob. The top knob is a manual on/off gas control for both the pilot and main gas valves. When the top knob is placed on the black mark, gas is supplied only to the pilot valve.

On the top view, we see the pilot solenoid and pilot and main gas regulators. The top view also displays the “TH and “TR” terminals. The pilot gas regulator is found under its cover screw. It is factory preset at 3.5”w.c. but can be adjusted from

2.5to 5 inches water column. The main gas regulator is found under its cover screw. It is factory preset to 3.5 inches w.c. and adjusts gas pressure output from 2.5 to 5 inches water column. The two electrical terminals are marked TH and TR. The TH terminal is the common between the pilot valve solenoid coil and the main valve solenoid coil. The other wire emerging from the pilot solenoid connects to the pilot valve electrical output on the IID (terminal PV). The TR terminal connects directly to the main valve electrical output from the IID module

(terminal MV).

On the outlet view of the gas valve, we see the pilot gas connection port, manifold gas connection port, a limited bleed vent port, the manifold gas and pressure tap.

See step 18 for BTR-500 gas valve illustration

A.O. Smith Water Products

12

Service Handbook

Irving, Texas ©2000

Training Department

Page 12 Page 14
Image 13
Page 12 Page 14
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.
Top Page Image Contents