A.O. Smith BFM - 120, BFM - 100 manual Circulation pipe Water connections, Unvented

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3.6.5 Circulation pipe

3.7Water connections, Unvented

See (C) in the installation diagram (3.5 "Installation diagram").

If an immediate flow of hot water is required at draw-off points, a circulation pump can be installed. This improves comfort and reduces water wastage.

1.Fit a circulation pump (6) of the correct capacity for the length and resistance of the circulation system.

2.Fit a non-return valve (5) behind the circulation pump to guarantee the direction of circulation.

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

4.Connect the circulation pipe to the T-piece at the drain valve (9) as shown in the drain valve figure (3.6.4 "Drain valve").

Warning

The installation should be carried out by an authorised installation engineer, in compliance with general and local regulations (1.3 "Regulations").

3.7.1Cold water side

See (A) in the installation diagram (3.5 "Installation diagram").

1.Fit an approved stop valve (4) on the cold water side as required by applicable regulations (1.3 "Regulations").

2.The maximum working pressure of the appliance is 8 bar. Because the pressure in the water pipe at times can exceed 8 bar, you must fit an approved pressure-reducing valve (1).

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

4.Fit an expansion valve (15) and connect the overflow side to an open wastewater pipe.

3.7.2Recirculation pipe

You can install a top to bottom circulation pump to prevent water stacking in the boiler.

1.Optional: depending on the draw-off pattern, fit a recirculation pipe (Ø 22 mm), a stop valve (11) and a top to bottom circulation pump (7).

2.Fit a non-return valve (5).

3.Fit a stop valve (11).

3.7.3Hot water side

See (B) in the installation diagram (3.5 "Installation diagram").

Note

Insulating long hot water pipes will prevent unnecessary energy loss.

1.Optional: fit a temperature gauge (12) so you can check the temperature of the tap water.

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

3.Fit a stop valve (11) in the hot water outlet pipe for servicing.

3.7.4Drain valve

1.Fit the standard drain valve (9) supplied with the appliance.

2.If applicable, fit a circulation pipe (3.6.5 "Circulation pipe").

If not, fit the blind threaded plug and gasket (C) supplied with the drain valve, as shown in the figure.

Instruction manual BFM 25