A.O. Smith TWI 35-130 Cold water side, Hot water side, Circulation piping, Condensation drainage

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3.6

Water connections

Warning

 

unvented

The installation shall be carried out by a recognised installation engineer in

accordance with the generally and locally applicable regulations (1.3 “Regulations”).

3.6.1Cold water side

See (A) in the connections diagram (3.5 “Connections diagram”).

1.Position an approved stop valve (4) on the cold water side in accordance with the applicable regulations (1.3 “Regulations”).

2.The maximum operating pressure of the device is 8 bars. As the water piping pressure can incidentally exceed 8 bars, mount an approved pressure reducing valve (1).

3.Mount a non-return valve (5) and an expansion vessel (16).

4.Mount an expansion valve (15) and connect the overflow side to an open water drainage pipe.

3.6.2Hot water side

See (B) in the connections diagram (3.5 “Connections diagram”).

Note

Insulation of the long hot water pipes prevents unnecessary loss of energy.

1.Option: mount a temperature meter (12) for checking the temperature of the tap water.

2.Mount the T&P valve (3).

3.Mount a stop valve (11) in the hot water distribution piping for service purposes.

3.6.3Circulation piping

See (C) in the connections diagram (3.5 “Connections diagram”). If you want to have hot water available immediately, you can install a circulation pump at the draw-off points. This is more comfortable and avoids spillage of water.

1.Mount a circulation pump (6) wit a capacity that corresponds with the size and the resistance of the circulation system.

2.Mount a non-return valve (5) following the circulation pump to guarantee the circulation direction.

3.Mount two stop valves (4) for service purposes.

4.Connect the circulation piping to the cold water supply pipe.

3.6.4Condensation drainage

1.Attach underneath the fall a drainage pipe to the siphon (13) for condensation drainage and connect this to the water discharge pipe.

Attention

All connections downstream the siphon shall be condensation-resistant.

3.7

Water connections

Warning

 

vented

The installation shall be carried out by a recognised installation engineer in

accordance with the generally and locally applicable regulations (1.3 “Regulations”).

3.7.1Cold water side

See (A) in the connections diagram (3.5 “Connections diagram”).

1.Mount on the cold water side an approved stop valve (4) between the water tank (18) and the device in accordance with the applicable regulations (1.3 “Regulations”).

3.7.2Hot water side

See (B) in the connections diagram (3.5 “Connections diagram”).

Note

Insulation of the long hot water pipes prevents unnecessary loss of energy.

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 Operation of the device InstallationErrors MaintenanceWarranty certificate Table of contentAbout the device What to do when you smell gas RegulationsIntroduction 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 deviceSecurity of the device Introduction Operation of the deviceHeating cycle 4 Fan Security of the water temperatureAir pressure switch Gas control3 T&P valve Unvented installationVented installation Packaging InstallationInstallation Working area Dimension Description TWI Dimensions of the deviceDescription Unit TWI Dimension Description TWIVented Condensation drainage Cold water sideHot water side Circulation pipingRequirements for flue gas discharge material Air supply and flue gas discharge IntroductionDevice types Practical example of concentric flue gas discharge Example Device types DescriptionConcentric connections Device Diameter Maximum length Maximum num Ber of 90 bendsSubject Description SpecificationsPractical example of parallel flue gas discharge Example Parallel connectionsDevice Diameter Maximum running length BendDevice 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 vented InstallationsDrain unvented Start up Opening the gas valve 3.5 Connections diagramStart up Electrically isolate Shut downIntroduction You can For a short timeShut down Errors visible on the control ErrorsIntroduction Distinction is made between General errors Explosive ignition Symptom Cause Solution Remark Gas smellWater leakage 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 11.3 Conditions Warranty certificate11.1 Warranty general 11.2 Warranty tankSmith Warranty certificate11.6 Claims 11.7 ObligationsAnnex 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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