Draining unvented Installations, Appliance

Draining

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)

MENU »OFF ^ ON

È WEEK PROGRAM

2.	Position the cursor in front of OFF.
3.	Confirm OFF with	.
4.	Wait until the fan has stopped. The symbol is then dimmed.

	Caution
	Failure to wait until the fan stops purging can cause damage to the

5.Switch the appliance OFF (position 0) using the ON/OFF switch on the control panel.

6.Isolate the water heater from the power supply by putting the isolator between the appliance and the mains power supply to position 0.

7.Shut off the gas supply (10).

8.Close the stop valve (11) in the hot water pipe.

9.Close the supply valve (4) in the cold water supply (A).

10.Open the drain valve (9).

11.Bleed the appliance (or installation) so that it drains completely.

54	Instruction manual SGE