A.O. Smith SGE Water connections, Unvented Cold water side, Hot water side, Circulation pipe

Warning

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

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Legend		11. service stop valve (recommended) 38. solar heating system pump station
Only applicable numbers are		12. temperature gauge	(modulating - mandatory)
mentioned.		(recommended)	A. cold water supply
1.	pressure-reducing valve	13. condensation drainage	B. hot water supply
	(mandatory if the mains water	(mandatory)	C. circulation pipe
	pressure exceeds 8 bar)	14. hot water draw-off points	D. gas supply
3.	T&P valve (mandatory)	15. expansion valve (mandatory)	E. overflow pipe
4.	stop valve (recommended in pipe C 16. expansion vessel (mandatory)		F. heat exchanger supply
5.	and mandatory in pipe A)	17. 3-way aeration valve	G. heat exchanger return
	non-return valve (mandatory)	(recommended)	H. overflow safety
6.	circulation pump (optional)	18. water tank
			S1.collector sensor (mandatory)
9.	drain valve (mandatory)	19. float valve
			S2.tank sensor (mandatory)
10. manual gas valve (mandatory)		23. pressure valve (mandatory)
			S4.heat exchanger discharge sensor
20. pressure valve (mandatory)		37. combined Q/T sensor (optional)
			(optional)

26. air bleed (mandatory)

3.6 Water connections, Unvented

3.6.1Cold 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.

3.6.2Hot 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.

3.6.3Circulation pipe

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 cold water supply pipe.

Instruction manual SGE 27