A.O. Smith TWI 35-130 Introduction, About the device, What to do when you smell gas Regulations

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1 Introduction

1.1About the device

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1.2What to do when you smell gas

1.3Regulations

This manual describes the installation, service and use of the TWI-device.

The TWI-device is a condensating boiler with a fan in the air supply. The TWI can be installed both as a closed and as an open device. The device typically has a concentric chimney connection. The device can also be connected as a parallel system.

The possible device types are B23, C13, C33, C43, C53 and C63.

The information in this manual is applicable to the TWI 35-130 and TWI 45-190. The construction method and the equipment of the device are in conformity with the European standard for gas-fired storage water heaters for the production of domestic hot water (EN 89). With this the devices comply with the European Directive for Gas Devices and so they have the right to the CE -mark.

Warning

Carefully read this manual before starting up the boiler. Not reading this manual and not following the given instructions may lead to personal injuries and damage to the device.

Warning

In case of smelling gas:

No open fire! No smoking!

Avoid sparking!

Do not use any electric switches, including telephone, plug or bell!

Open windows and doors!

Shut off the mains gas supply valve!

Warn occupants and leave the building!

After having left the building, warn the gas company or the installation engineer.

As (end) user, installation engineer or service and maintenance engineer you shall make sure that the entire installation at least complies with the locally applicable:

•building regulations;

•guidelines for existing gas systems formulated by the electricity company;

•guidelines for natural gas systems and the corresponding practical guidelines;

•safety regulations for low-voltage systems;

•regulations concerning drinking water supply;

•regulations concerning ventilation in buildings;

•regulations concerning supply of combustion air;

•regulations concerning discharge of flue gasses;

•requirements for gas-consuming systems;

•regulations concerning inside sewer systems in buildings;

•regulations of the fire department, electricity companies and the municipality.

Further the installation shall comply with the regulations of the manufacturer.

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 contentWhat to do when you smell gas Regulations IntroductionAbout 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 deviceOperation of the device Heating cycleSecurity of the device Introduction Air pressure switch Security of the water temperatureGas control 4 FanUnvented installation Vented 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 Installations Drain unventedDrain vented Start up Opening the gas valve 3.5 Connections diagramStart up Introduction You can Shut downFor a short time Electrically isolateShut down Errors Introduction Distinction is made between General errorsErrors visible on the control Symptom Cause Solution Remark Gas smell Water leakageExplosive 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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