A.O. Smith TWI 45-190, TWI 35-130 Circulation piping, Condensation drainage, Installation

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.

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