A.O. Smith TWI 35-130, TWI 45-190 service manual Operation of the device

Page 13

2Operation of the device

2.1

Introduction

This chapter will cover in the given order:

 

 

• General operation of the device;

 

 

• Heating cycle of the device;

 

 

• Security of the device;

 

 

• Safety of the installation.

2.2

General operation

The figure shows a cross section of the device.

 

of the device

 

Cross section of the device

Legends IMD-0527

1. Temperature sensor / ECO

2.Insulating layer

3.Air pressure switch

4.Burner

5. Venturi

6. Air supply pipe

7. Gas control

8. Cover plate

9. Hot surface igniter

10. Fan

11. Thermostat

12. Hot water outlet

13. Heat exchanger

14. Tank

15. Combustion chamber

16. Cold water inlet

17. Concentric measuring tube

18. Air supply hose

19. Flue gas discharge

20. Siphon

21. Transformer 230 VAC-120 VAC

22. Drain valve

23. Connector

24. Transformer 120 VAC-24 VAC

25. Electronic control

26. Thermostat board

27. Inspection window

IMD-0527 RO

Instruction manual TWI 35-130 G/TWI 45-190 G

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Contents 35-130 45-190 Your installer Page Page Copyright 2007 A.O. Smith Water Products Company Page Errors InstallationMaintenance Operation of the deviceWarranty certificate Table of contentIntroduction What to do when you smell gas RegulationsAbout the device Target groups IntroductionChapter Target groups Description InstallationThis chapter contains the terms of warranty Warranty certificateIntroduction This chapter will cover in the given order Operation of the deviceHeating cycle Operation of the deviceSecurity of the device Introduction Air pressure switch Security of the water temperatureGas control 4 FanVented installation Unvented installation3 T&P valve Packaging InstallationInstallation Working area Dimension Description TWI Dimensions of the deviceDescription Unit TWI Dimension Description TWIVented Hot water side Cold water sideCirculation piping Condensation drainageRequirements for flue gas discharge material Air supply and flue gas discharge IntroductionDevice types Concentric connections Device types DescriptionDevice Diameter Maximum length Maximum num Ber of 90 bends Practical example of concentric flue gas discharge ExampleSubject Description SpecificationsDevice Diameter Maximum running length Parallel connectionsBend Practical example of parallel flue gas discharge ExampleDevice with parallel flue gas discharge material Preparation Electrical connectionConnector block Isolating transformer Check and adjust the CO2-value Connect the mains voltageGas control Checking procedureAdjust the CO2-value Conversion to another gas category Conversion to another gas category Unvented FillFill vented installations Fill the device Fill unvented installationsDrain Drain unvented InstallationsDrain vented Start up Opening the gas valve 3.5 Connections diagramStart up Introduction You can Shut downFor a short time Electrically isolateShut down Introduction Distinction is made between General errors ErrorsErrors visible on the control Water leakage Symptom Cause Solution Remark Gas smellExplosive ignition Hot water Symptom Cause Solution Remark Insufficient or noLight pulses Cause Solution Remark Troubleshooting table for errors visible on the controlSee 12.2 Electrical circuit diagram Light pulses Cause Solution Remark SL3TWI Introduction Prepare maintenance MaintenanceMaintenance 11.1 Warranty general Warranty certificate11.2 Warranty tank 11.3 Conditions11.6 Claims Warranty certificate11.7 Obligations SmithAnnex Annex Electrical circuit diagramWiring Annex Connect IndexIndex User WarrantyPage 0308 489 R1.0

TWI 35-130, TWI 45-190 specifications

A.O. Smith TWI 35-130 and TWI 45-190 are high-efficiency water heaters designed to meet the diverse needs of residential and commercial applications. These units are part of A.O. Smith’s extensive product line, known for reliability, durability, and energy efficiency.

The TWI 35-130 model is a 35-gallon tank water heater, offering a first-hour delivery of 130 gallons. This capacity makes it suitable for households with moderate hot water demands. It features a compact design, allowing for easy installation in tighter spaces, which is ideal for urban settings. The unit operates on natural gas, promoting energy efficiency while reducing operational costs.

One of its main attributes is the advanced insulation technology that minimizes heat loss, thus enhancing overall energy efficiency. The TWI 35-130 is equipped with a state-of-the-art burner system that optimizes combustion for higher efficiency, translating to lower energy bills. Furthermore, it utilizes a dip tube that helps in delivering hot water promptly, ensuring that the demand for hot water is met swiftly.

On the other hand, the TWI 45-190 model caters to larger households or commercial settings with a 45-gallon capacity and a first-hour delivery of 190 gallons. This model also uses natural gas, but with a higher BTU rating, allowing for faster recovery rates, which is crucial during peak usage times.

Both models are designed with user-friendliness in mind, featuring intuitive controls that facilitate easy temperature adjustments and monitoring. Additionally, they incorporate safety features such as a temperature and pressure relief valve to prevent overheating and excessive pressure build-up, ensuring peace of mind for users.

Their innovative design also emphasizes longevity, with high-grade materials and protective coatings that resist corrosion and extend the lifespan of the tank. The TWI series stands out in the market not only for its performance and efficiency but also for its commitment to sustainability.

In summary, A.O. Smith's TWI 35-130 and TWI 45-190 water heaters bring together cutting-edge technology, efficiency, and reliability, making them excellent choices for both residential and commercial applications. With features designed to promote energy savings and user convenience, these models are poised to meet the hot water demands of modern life while adhering to high standards of safety and durability.
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