3 Installation

 

Explanation of device types

 

 

 

 

 

 

 

Device types

Description

 

 

 

B23

Combustion air is extracted from the installation area.

 

C13

Concentric and/or parallel wall flue terminal

 

C33

Concentric and/or parallel roof flue terminal

 

C43

Devices on common supply and discharge (concentric and/or parallel) in

 

blocks of flats.

 

 

 

C53

Supply and discharge in different pressure area.

 

C63

Devices delivered without flue gas discharge materials and/or terminal. These

 

devices are to be installed in accordance with the applicable local guidelines.

 

 

 

 

 

 

Remark

 

 

 

 

Make sure that the flue gas discharge is positioned in a discharge area in

 

which discharge is allowed for the respective device type.

 

 

 

 

 

3.9.3

Concentric connections

 

 

 

The table gives the requirements that the concentric systems shall meet.

 

 

 

 

 

 

Warning

 

 

 

 

Mount flue gas discharge material with a fall of 5 mm per metre towards

 

the device.

 

 

 

 

 

 

Requirements for flue gas discharge for concentric systems (C13, C33)

 

 

 

 

 

 

Device

Diameter

Maximum length

Maximum num-

 

 

 

 

ber of 90° bends

 

TWI 35-130

80/125

20

5

 

TWI 45-190

80/125

20

5

Caution

Both conditions given in the table shall be complied with.

When using less than the maximum number of bends, it is still not allowed to use more than the maximum pipe length.

When using less than the maximum pipe length, it is still not allowed to use more than the maximum number of bends.

All this will be explained using an example.

Practical example of concentric flue gas discharge

Example

The figure shows a TWI 35-130. The device shall be provided with a 15 m concentric pipe (C13/C33) and four 90° bends. An inspection shall be carried out for compliance of this configuration with the requirements stated in the table.

24

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

Page 26
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A.O. Smith TWI 45-190, TWI 35-130 service manual Device types Description, Concentric connections

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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