3 Installation

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

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

3.Mount a stop valve (4) in the hot water distribution piping for service purposes.

4.If circulation piping is required, proceed by mounting the circulation piping (3.6.3 “Circulation piping”).

3.7.3Circulation 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.

3.7.4Condensation 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.

Warning

3.8 Gas connectionThe installation shall be carried out by a recognised installation engineer in accordance with the generally and locally applicable regulations (1.3 “Regulations”).

Caution

Make sure that the diameter and the length of the gas supply pipes are suitable for delivering sufficient capacity to the device.

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

1.Mount the gas valve (10) in the gas supply pipe.

2.Purge the gas pipe before use.

3.Close the gas valve.

Warning

Check for leakages after mounting.

3.9Air supply and flue gas discharge

3.9.1Introduction

This section describes the following subjects:

Requirements for flue gas discharge material

Parallel connections

3.9.2Requirements for flue gas discharge material

Warning

The installation shall be carried out by a recognised installation engineer in accordance with the generally and locally applicable regulations (1.3 “Regulations”).

There are various possibilities for connecting the air supply and flue gas discharge, dependent on the inspected device types.

The devices have been inspected for the device types B23, C13, C33, C43,

C53 and C63.

The figure and the table provide information about these device types. Please contact the manufacturer if you require an explanation of the possibilities.

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

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A.O. Smith TWI 45-190 Air supply and flue gas discharge Introduction, Requirements for flue gas discharge material

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.

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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.